OMB APPROVAL OMB Number: 3235-0570 Expires: August 31, 2013 Estimated average burden hours per response.....18.9 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM N-CSR CERTIFIED SHAREHOLDER REPORT OF REGISTERED MANAGEMENT INVESTMENT COMPANIES 		Investment Company Act file number 811-21569 Pioneer Ibbotson Asset Allocation Series (Exact name of registrant as specified in charter) 60 State Street, Boston, MA 02109 (Address of principal executive offices) (ZIP code) Terrence J. Cullen, Pioneer Investment Management, Inc., 60 State Street, Boston, MA 02109 (Name and address of agent for service) Registrant's telephone number, including area code: (617) 742-7825 Date of fiscal year end: July 31 Date of reporting period: August 1, 2012 through January 31, 2013 Form N-CSR is to be used by management investment companies to file reports with the Commission not later than 10 days after the transmission to stockholders of any report that is required to be transmitted to stockholders under Rule 30e-1 under the Investment Company Act of 1940 (17 CFR 270.30e-1). The Commission may use the information provided on Form N-CSR in its regulatory, disclosure review, inspection, and policymaking roles. A registrant is required to disclose the information specified by Form N-CSR, and the Commission will make this information public. A registrant is not required to respond to the collection of information contained in Form N-CSR unless the Form displays a currently valid Office of Management and Budget ("OMB") control number. Please direct comments concerning the accuracy of the information collection burden estimate and any suggestions for reducing the burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW, Washington, DC 20549-0609. The OMB has reviewed this collection of information under the clearance requirements of 44 U.S.C. ss. 3507. ITEM 1. REPORTS TO SHAREOWNERS. Pioneer Ibbotson Asset Allocation Series -------------------------------------------------------------------------------- Semiannual Report | January 31, 2013 -------------------------------------------------------------------------------- Ticker Symbols: Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Class Fund Fund Fund Fund ----- ---- ---- ---- ---- A PIAVX PIALX GRAAX PIAAX B PIBVX PIBLX GRABX IALBX C PICVX PIDCX GRACX IALCX Y IBBCX IMOYX IBGYX IBAYX [LOGO] PIONEER Investments(R) visit us: us.pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Fund Reviews 8 Comparing Ongoing Fund Expenses 10 Prices and Distributions 18 Portfolio Summary & Performance Update 21 Schedule of Investments 41 Financial Statements 49 Notes to Financial Statements 71 Approval of Investment Advisory and Sub-Advisory Agreements 82 Trustees, Officers and Service Providers 102 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 1 President's Letter Dear Shareowner, Pioneer has been cautiously optimistic about the U.S. economy from the start of the year, and the data continues to be encouraging. Employment continues to rise, albeit slowly, and we believe it should continue to do so in 2013, barring a negative shock to the system. The housing and auto sectors continue to recover, benefiting from record-low interest rates. Banks' willingness to lend to consumers and businesses also continues to rise, broad measures of inflation remain subdued, and, if the weather improves in 2013, that should help to bring food prices back down. While corporate profit growth has slowed, many U.S. companies still have strong balance sheets and continue to display the ability to both pay and increase dividends*. While the so-called "fiscal cliff" scheduled to take effect at year-end dominated the media in December--and while no deal was struck before markets closed for the year--investors who owned financial assets like equities and high-yield corporate bonds generally enjoyed good returns in 2012. The Standard & Poor's 500 Index returned 16% in 2012, and the Bank of America Merrill Lynch High Yield Master II Index returned 15.6%. Meanwhile, the higher-quality Barclays Aggregate Bond Index gained 4.2% for the year, the safer-still Barclays Intermediate Treasuries Index returned 3.9%, and 3-month Treasury bills, generally regarded as essentially "risk free" by the markets, returned just 0.1% in 2012. Despite generally improving economic conditions and positive market returns in 2012, investors still face daunting challenges in the year ahead, although we remain optimistic that the underlying economic trends are moving in the right direction. The year-end "fiscal cliff" deal did not eliminate the risk of further tax increases or spending cuts, nor did it eliminate the risk that the U.S. could face further downgrades to its credit rating from one or more of the major ratings agencies.The Federal Reserve Board continues to provide extraordinary support to the U.S. economy and the bond market, but will not do so indefinitely. Europe has made progress towards dampening its sovereign-debt crisis, but has not resolved the problem as yet; the region also was mired in a recession as 2012 drew to a close. In Asia, Japan continues to struggle with low economic growth, * Dividends are not guaranteed. 2 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 deflation, high levels of debt, and an aging population. In the emerging markets, China and other developing economies, while generally in better shape than most "developed" markets, also face a range of ongoing challenges. While most of the risks outlined above are widely recognized and may already be "priced in" to the market, we believe investors should continue to expect market volatility tied to these factors. At Pioneer, we have long advocated the benefits of staying diversified* and investing for the long term. And while diversification alone does not assure a profit or protect against loss in a declining market, we believe there are still opportunities for prudent investors to earn attractive returns. Our advice, as always, is to work closely with a trusted financial advisor to discuss your goals and work together to develop an investment strategy that meets your individual needs, keeping in mind that there is no single best strategy that works for every investor. In 2013, Pioneer proudly celebrates its 85th anniversary. Since 1928, our investment teams have sought out attractive opportunities in global equity and bond markets, using in-depth research to identify undervalued individual securities, and using thoughtful risk management to construct portfolios which balance potential risks and reward in an ever-changing world. We encourage you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at us.pioneerinvestments.com. We greatly appreciate your trust in us, and we thank you for investing with Pioneer. Sincerely, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareowner report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. * Diversification does not assure a profit nor protect against loss in a declining market. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 3 Portfolio Management Discussion | 1/31/13 In the following interview, portfolio manager Brian Huckstep, CFA, Ibbotson Associates, Inc., sub-adviser to the Pioneer Ibbotson Asset Allocation Series portfolios, discusses the market environment and investment strategies that were applied to the portfolios during the six-month period ended January 31, 2013. Q Could you characterize the economic and market backdrop during the six months ended January 31, 2013? A As the period began, concern over the European sovereign-debt crisis and its potential to affect the global economy continued to constrain investor sentiment. As the period progressed, however, markets increasingly began to anticipate increased easing measures from global central banks. Those expectations were met in September 2012 when the European Central Bank (ECB) lowered its overnight deposit rate to zero and announced a plan for open-ended purchases of short-term bonds issued by countries in the euro zone requesting aid; the ECB's move greatly diminished the risk of a sovereign default and quelled some of the market's concerns. At roughly the same time, the U.S. Federal Reserve Board (the Fed), citing worrisome employment data, announced plans for another round of quantitative easing (QE3), which entailed the central bank's purchasing Treasury bonds as well as government agency mortgages in the open market; investors also interpreted some of the Fed's actions as an indication that the central bank would be willing to keep short-term interest rates at or near zero for an indefinite period. The prospect of prolonged central-bank monetary support for the global economy led to an increase in investors' risk appetites and boosted stock valuations. The upward momentum for riskier assets was tempered following the November 2012 U.S. elections, as investors began to focus on the political stalemate in Washington that had the potential to threaten the health of the U.S. economy due to the so-called "fiscal cliff"--a combination of automatic budget cuts and tax increases that were scheduled to take effect at the end of 2012. While the standoff had an impact on equities around the globe, U.S. stocks underperformed international stocks materially late in 2012. Ultimately, the "fiscal cliff" was averted, and stocks resumed their upward momentum in January of 2013, supported by continued improvements in U.S. auto sales and housing data. In addition, indications that economic growth in China would remain at levels sufficient to meaningfully bolster the global growth outlook further supported riskier assets toward the end of the six-month period. 4 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 For the six months ended January 31, 2013, the U.S. equity market, as measured by the Standard & Poor's 500 Index (the S&P 500), returned 9.90%, lagging international equities, which returned 18.72%, as gauged by the Morgan Stanley Capital International (MSCI) Europe, Australasia, Far East (EAFE) Index. Within the U.S. equity market, small-capitalization stocks outperformed large-cap stocks and value-oriented stocks outperformed their growth counterparts. Domestic bonds, as measured by the Barclays Aggregate Bond Index (the Barclays Index), returned -0.29% during the six-month period. Q What considerations and tactical shifts did you apply when allocating assets within the Pioneer portfolios during the six months ended January 31, 2013, and how did your strategies affect the portfolios' performance? A Overall, our tactical emphases within the portfolios were defensive in nature, and detracted modestly from the portfolios' performance during the six-month period. Throughout the period, we maintained an underweight to equities and an overweight to bonds in the portfolios. Our decision to weight the portfolios in that fashion was driven, initially, by our concerns about the subpar U.S. economic recovery as well as the difficulties plaguing Europe. We have maintained the underweight to equities in the portfolios in light of what appears, in our view, to be a trend of weakening company fundamentals in the aggregate. The portfolios' tilt toward bonds acted as a constraint on returns during the six-month period as equities produced strong returns, largely in response to the extraordinary easing measures undertaken by global central banks, which we discussed earlier. We also have implemented a tilt within the portfolios' equity sleeves in favor of international stocks over domestic stocks, as we have for some time now viewed U.S. stock valuations as stretched. The shift toward international equities contributed to the portfolios' performance during the period, as international stocks rallied on central bank actions while U.S. stock returns were constrained by political uncertainty in the final months of 2012. We continue to view international stocks as more attractively valued than domestic equities. Within the U.S. equity portions of the portfolios, we have been favoring larger-cap stocks while maintaining somewhat reduced exposure to smaller-cap stocks and real estate investment trusts (REITs). The portfolios' tilt toward large caps reflects our view that large-cap corporations generally are not only better positioned to weather an uncertain economic climate, but also currently display the most attractive valuations within the U.S. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 5 equity market. The tilt away from REITs added to the portfolios' performance during the six-month period, while reduced exposure to small-cap equities constrained returns. We continue to believe, however, that large-cap fundamentals will be rewarded on a relative basis as equity investors navigate a period of higher-than-usual economic uncertainty and market volatility. Regarding REITs, we continue to believe that U.S. property stocks are trading at valuations that may be difficult to sustain, and that are hard to justify by current fundamentals. Q What factors are you watching most closely as you determine your investment strategy for the portfolios going forward? A In our view, the fundamental picture for most companies continues to be on the decline, as reflected by the increasing number of earnings revisions and negative outlook statements being released. While governments and central banks continue to provide economic stimulus, a weakening corporate picture appears to be emerging, and we believe that is likely to mostly counterbalance the ongoing fiscal policy support. In addition, we believe fiscal policy will most likely be less expansionary in 2013 than in 2012, with slightly higher taxes and some restraints on government spending. In the United States, the good news going forward is that the U.S. economy has overcome a few obstacles. First, the residential housing market is no longer contracting, and, during 2012, it started making modest positive contributions to economic growth. Second, fiscal consolidation at the state and local levels has probably ended. Third, consumer deleveraging has likely run most of its course. Debt balances, while still declining, should start coming down at decreasing speed, potentially freeing up income for discretionary spending. With that said, it is our opinion that U.S. stock valuations are high by historical measures and that investors' expectations are quite positive for the U.S. economy and corporate earnings. All of those factors add to the downside risk for U.S. stocks and support the reasoning behind our decision to underweight the portfolios to stocks in general, and to domestic equities in particular. In short, we are comfortable with our continued bias toward reducing risk in the portfolios. The uncertain near-term economic environment, in our view, continues to reinforce the importance of maintaining a diversified* investment portfolio consistent with one's long-term objectives. We will continue to closely monitor the economic backdrop as we manage the portfolios within their strategic asset allocation guidelines. * Diversification does not assure a profit nor protect against loss in a declining market. 6 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Please refer to the Schedule of Investments on pages 41-48 for a full listing of fund securities. A fund's performance depends on the adviser's skill in determining the strategic asset class allocations, the mix of underlying Pioneer funds, as well as the performance of those underlying funds. The underlying funds' performance may be lower than the performance of the asset class that they were selected to represent. Stocks and bonds can decline due to adverse issuer, market, regulatory, or economic developments. International markets may be less liquid and can be more volatile than U.S. markets. These risk factors, including those associated with currency exchange rates, also apply to investments in international markets, all of which make investments in international markets more volatile and less liquid than investments in domestic markets. Some of the underlying funds can invest in either high-yield securities or small/emerging growth companies. Investments in these types of securities generally are subject to greater volatility than either higher-grade securities or more-established companies, respectively. These risks may increase share price volatility. Before making an investment in any fund, you should consider all the risks associated with it. Please see the Fund Reviews beginning on page 8 for information on specific weightings and performance for each of the four funds in the Pioneer Ibbotson Asset Allocation Series. Any information in this shareowner report regarding market or economic trends or the factors influencing each fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 7 Fund Reviews | 1/31/13 Pioneer Ibbotson Conservative Allocation Fund The Fund's Class A shares returned 6.15% at net asset value during the six months ended January 31, 2013, while the S&P 500 returned 9.90% and the Barclays Index returned -0.29%. During the same period, the average return of the 352 mutual funds in Lipper's Mixed-Asset Target Allocation Conservative Funds category was 4.82%. As of January 31, 2013, the Fund was targeting an asset allocation of 29% equities and 71% fixed income, compared with a neutral allocation of 30% equities and 70% fixed income. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in Pioneer Bond Fund, at 21.55% of assets, followed by Pioneer Short Term Income Fund, at 19.20%. The next two largest positions also were fixed-income funds: Pioneer Strategic Income Fund and Pioneer Global High Yield Fund, at 8.29% and 6.27% of assets, respectively. The largest equity position in the Fund as of January 31, 2013, was Pioneer International Value Fund, at 7.43% of assets. Pioneer Ibbotson Moderate Allocation Fund The Fund's Class A shares returned 8.46% at net asset value during the six months ended January 31, 2013, while the S&P 500 returned 9.90% and the Barclays Index returned -0.29%. During the same period, the average return of the 522 mutual funds in Lipper's Mixed-Asset Target Allocation Moderate Funds category was 7.40%. As of January 31, 2013, the Fund was targeting an asset allocation of 57.5% equities and 42.5% fixed income, compared with a neutral allocation of 60% equities, 40% fixed income. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in Pioneer Short Term Income Fund, at 11.61% of assets, followed by Pioneer Bond Fund, at 11.54%. Within the equity portion of the Fund, Pioneer International Value Fund was the largest holding, at 10.94% of assets on January 31, 2013. Pioneer Global Equity Fund was the next-largest equity holding, at 8.52% of assets, followed by Pioneer Mid Cap Value Fund, at 6.84%. Pioneer Ibbotson Growth Allocation Fund The Fund's Class A shares returned 9.40% at net asset value during the six months ended January 31, 2013, while the S&P 500 returned 9.90% and the Barclays Index returned -0.29%. During the same period, the average return of the 592 mutual funds in Lipper's Mixed-Target Allocation Growth Funds category was 8.92%. 8 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 As of January 31, 2013, the Fund was targeting an asset allocation of 70% equities and 30% fixed income, compared with a neutral allocation of 75% equities and 25% fixed income. Within the equity portion of the Fund, Pioneer International Value Fund was the largest holding, at 13.39% of assets on January 31, 2013. Pioneer Global Equity Fund was the next-largest equity holding, at 9.37% of assets, followed by Pioneer Mid Cap Value Fund, at 7.15%. Within the fixed-income portion of the Fund, the largest holding as of January 31, 2013, was in Pioneer Bond Fund, at 9.93% of assets, followed by Pioneer Short Term Income Fund, at 7.92%. Pioneer Ibbotson Aggressive Allocation Fund The Fund's Class A shares returned 10.85% at net asset value during the six months ended January 31, 2013, while the S&P 500 returned 9.90% and the Barclays Index returned -0.29%. During the same period, the average return of the 794 mutual funds in Lipper's Multi-Cap Core Funds category was 12.68%. As of January 31, 2013, the Fund was targeting an asset allocation of 83.5% equities and 16.5% fixed income, compared with a neutral allocation of 90% equities and 10% fixed income. Within the equity portion of the Fund, Pioneer International Value Fund was the largest holding, at 18.37% of assets on January 31, 2013. Pioneer Global Equity Fund was the next-largest equity holding, at 10.78% of assets, followed by Pioneer Mid Cap Value Fund, at 10.46%. The largest fixed-income position in the Fund as of January 31, 2013, was Pioneer Bond Fund, at 5.98% of assets. Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Any information in this shareowner report regarding market or economic trends or the factors influencing each fund's historical or future performance are statements of opinion as of the date of this report. These statements should not be relied upon for any other purposes. Past performance is no guarantee of future results, and there is no guarantee that market forecasts discussed will be realized. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 9 Comparing Ongoing Fund Expenses Pioneer Ibbotson Conservative Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Conservative Allocation Fund Based on actual returns from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,061.50 $1,056.00 $1,055.90 $1,060.20 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.64 $ 11.97 $ 11.40 $ 7.53 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.47%, 2.31%, 2.20% and 1.45% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 10 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Conservative Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,017.80 $1,013.56 $1,014.12 $1,017.90 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.48 $ 11.72 $ 11.17 $ 7.37 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.47%, 2.31%, 2.20% and 1.45% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 11 Comparing Ongoing Fund Expenses Pioneer Ibbotson Moderate Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Moderate Allocation Fund Based on actual returns from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,084.60 $1,080.00 $1,080.50 $1,085.90 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.67 $ 12.22 $ 11.27 $ 5.84 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.46%, 2.33%, 2.15% and 1.11% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 12 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Moderate Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,017.85 $1,013.46 $1,014.37 $1,019.61 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.43 $ 11.82 $ 10.92 $ 5.65 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.46%, 2.33%, 2.15% and 1.11% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 13 Comparing Ongoing Fund Expenses Pioneer Ibbotson Growth Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Growth Allocation Fund Based on actual returns from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,094.00 $1,090.20 $1,090.40 $1,096.40 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.97 $ 12.64 $ 11.64 $ 6.50 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.51%, 2.40%, 2.21% and 1.23% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 14 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Growth Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,017.59 $1,013.11 $1,014.06 $1,019.00 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 7.68 $ 12.18 $ 11.22 $ 6.26 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.51%, 2.40%, 2.21% and 1.23% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 15 Comparing Ongoing Fund Expenses Pioneer Ibbotson Aggressive Allocation Fund As a shareowner in the Fund, you incur two types of costs: (1) ongoing costs, including management fees, distribution and/or service (12b-1) fees, and other Fund expenses; and (2) transaction costs, including sales charges (loads) on purchase payments. This example is intended to help you understand your ongoing expenses (in dollars) of investing in the Fund and to compare these costs with the ongoing costs of investing in other mutual funds. The example is based on an investment of $1,000 at the beginning of the Fund's latest six-month period and held throughout the six months. Using the Tables -------------------------------------------------------------------------------- Actual Expenses The first table below provides information about actual account values and actual expenses. You may use the information in this table, together with the amount you invested, to estimate the expenses that you paid over the period as follows: (1) Divide your account value by $1,000 Example: an $8,600 account value (divided by) $1,000 = 8.6 (2) Multiply the result in (1) above by the corresponding share class's number in the third row under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Aggressive Allocation Fund Based on actual returns from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,108.50 $1,103.50 $1,103.90 $1,109.70 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 8.72 $ 13.36 $ 12.41 $ 7.07 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.64%, 2.52%, 2.34% and 1.33% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 16 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Hypothetical Example for Comparison Purposes The table below provides information about hypothetical account values and hypothetical expenses based on the Fund's actual expense ratio and an assumed rate of return of 5% per year before expenses, which is not the Fund's actual return. The hypothetical account values and expenses may not be used to estimate the actual ending account balance or expenses you paid for the period. You may use this information to compare the ongoing costs of investing in the Fund and other funds. To do so, compare this 5% hypothetical example with the 5% hypothetical examples that appear in the shareholder reports of the other funds. Please note that the expenses shown in the tables are meant to highlight your ongoing costs only and do not reflect any transaction costs, such as sales charges (loads) that are charged at the time of the transaction. Therefore, the table below is useful in comparing ongoing costs only and will not help you determine the relative total costs of owning different funds. In addition, if these transaction costs were included, your costs would have been higher. Expenses Paid on a $1,000 Investment in Pioneer Ibbotson Aggressive Allocation Fund Based on a hypothetical 5% per year return before expenses, reflecting the period from August 1, 2012 through January 31, 2013. -------------------------------------------------------------------------------- Share Class A B C Y -------------------------------------------------------------------------------- Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 8/1/12 -------------------------------------------------------------------------------- Ending Account Value $1,016.94 $1,012.50 $1,013.41 $1,018.50 (after expenses) on 1/31/13 -------------------------------------------------------------------------------- Expenses Paid $ 8.34 $ 12.78 $ 11.88 $ 6.77 During Period* -------------------------------------------------------------------------------- * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.64%, 2.52%, 2.34% and 1.33% for Class A, Class B, Class C and Class Y shares, respectively. These combined ratios were multiplied by the average account value over the period, and then multiplied by 184/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 17 Prices and Distributions | 1/31/13 Net Asset Value per Share -------------------------------------------------------------------------------- Conservative Allocation Fund -------------------------------------------------------------------------------- Class 1/31/13 7/31/12 -------------------------------------------------------------------------------- A $11.15 $10.73 -------------------------------------------------------------------------------- B $10.97 $10.51 -------------------------------------------------------------------------------- C $10.86 $10.44 -------------------------------------------------------------------------------- Y $10.66 $10.21 -------------------------------------------------------------------------------- Moderate Allocation Fund -------------------------------------------------------------------------------- Class 1/31/13 7/31/12 -------------------------------------------------------------------------------- A $11.12 $10.46 -------------------------------------------------------------------------------- B $10.78 $10.04 -------------------------------------------------------------------------------- C $10.39 $ 9.77 -------------------------------------------------------------------------------- Y $11.23 $10.58 -------------------------------------------------------------------------------- Growth Allocation Fund -------------------------------------------------------------------------------- Class 1/31/13 7/31/12 -------------------------------------------------------------------------------- A $11.58 $10.75 -------------------------------------------------------------------------------- B $10.32 $ 9.52 -------------------------------------------------------------------------------- C $10.99 $10.18 -------------------------------------------------------------------------------- Y $11.80 $10.95 -------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------------------------------------------------------------- Class 1/31/13 7/31/12 -------------------------------------------------------------------------------- A $11.63 $10.60 -------------------------------------------------------------------------------- B $10.98 $9.95 -------------------------------------------------------------------------------- C $11.07 $10.07 -------------------------------------------------------------------------------- Y $11.66 $10.65 -------------------------------------------------------------------------------- 18 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Distributions per Share: 8/31/12-1/31/13 -------------------------------------------------------------------------------- Conservative Allocation Fund -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.2343 $ -- $ -- -------------------------------------------------------------------------------- B $0.1261 $ -- $ -- -------------------------------------------------------------------------------- C $0.1603 $ -- $ -- -------------------------------------------------------------------------------- Y $0.1599 $ -- $ -- -------------------------------------------------------------------------------- Moderate Allocation Fund -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.2164 $ -- $ -- -------------------------------------------------------------------------------- B $0.0610 $ -- $ -- -------------------------------------------------------------------------------- C $0.1603 $ -- $ -- -------------------------------------------------------------------------------- Y $0.2481 $ -- $ -- -------------------------------------------------------------------------------- Growth Allocation Fund -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.1726 $ -- $ -- -------------------------------------------------------------------------------- B $0.0560 $ -- $ -- -------------------------------------------------------------------------------- C $0.1047 $ -- $ -- -------------------------------------------------------------------------------- Y $0.1955 $ -- $ -- -------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains -------------------------------------------------------------------------------- A $0.1136 $ -- $ -- -------------------------------------------------------------------------------- B $ -- $ -- $ -- -------------------------------------------------------------------------------- C $0.0443 $ -- $ -- -------------------------------------------------------------------------------- Y $0.1494 $ -- $ -- -------------------------------------------------------------------------------- Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 19 Prices and Distributions | 1/31/13 (continued) Index Definitions -------------------------------------------------------------------------------- The Standard & Poor's 500 Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Aggregate Bond Index is a measure of the U.S. bond market. Index returns are calculated monthly, assume reinvestment of dividends and, unlike Fund returns, do not reflect any fees, expenses or sales charges. It is not possible to invest directly in an index. The indices defined here pertain to the "Value of $10,000 Investment" and "Value of $5 Million Investment" charts on pages 22-25, 27-30, 32-35 and 37-40. 20 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Portfolio Summary | 1/31/13 Pioneer Ibbotson Conservative Allocation Fund Target Asset Allocations -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Fixed Income 70% Equity 30% Short Term Bonds 27.00% -------------------------------------------------------------------------------- Domestic Corporate Bonds 17.00 -------------------------------------------------------------------------------- Cash & Cash Equivalents 13.00 -------------------------------------------------------------------------------- High-Yield Corporate Bonds 13.00 -------------------------------------------------------------------------------- Large Cap Growth 9.00 -------------------------------------------------------------------------------- Large Cap Value 9.00 -------------------------------------------------------------------------------- International Equities 8.00 -------------------------------------------------------------------------------- Mid/Small Cap Growth 2.00 -------------------------------------------------------------------------------- Mid/Small Cap Value 2.00 -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) -------------------------------------------------------------------------------- U.S. Stocks -------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund Class Y 4.16% -------------------------------------------------------------------------------- Pioneer Fund Class Y 3.13 -------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund Class Y 2.15 -------------------------------------------------------------------------------- Pioneer Fundamental Value Fund Class Y 2.14 -------------------------------------------------------------------------------- Pioneer Research Fund Class Y 2.14 -------------------------------------------------------------------------------- Pioneer Disciplined Value Fund Class Y 2.13 -------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund Class Y 2.13 -------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund Class Y 1.32 -------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund Class Y 1.09 -------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund Class Y 1.07 -------------------------------------------------------------------------------- Pioneer Equity Income Fund Class Y 1.07 -------------------------------------------------------------------------------- Pioneer Real Estate Shares Class Y 1.06 -------------------------------------------------------------------------------- Pioneer Multi-Asset Ultrashort Income Fund Class Y 1.03 -------------------------------------------------------------------------------- International Stocks -------------------------------------------------------------------------------- Pioneer International Value Fund Class Y 7.43% -------------------------------------------------------------------------------- Pioneer Global Equity Fund Class Y 4.29 -------------------------------------------------------------------------------- Pioneer Emerging Markets Fund Class Y 1.04 -------------------------------------------------------------------------------- Bonds -------------------------------------------------------------------------------- Pioneer Bond Fund Class Y 21.55% -------------------------------------------------------------------------------- Pioneer Short Term Income Fund Class Y 19.20 -------------------------------------------------------------------------------- Pioneer Strategic Income Fund Class Y 8.29 -------------------------------------------------------------------------------- Pioneer Global High Yield Fund Class Y 6.27 -------------------------------------------------------------------------------- Pioneer High Yield Fund Class Y 4.20 -------------------------------------------------------------------------------- Pioneer Global Aggregate Bond Fund Class Y 2.07 -------------------------------------------------------------------------------- Pioneer Floating Rate Fund Class Y 1.04 -------------------------------------------------------------------------------- This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 21 Performance Update | 1/31/13 Class A Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class 5/12/2005 4.62% 3.82% 5 Years 4.09 2.86 1 Year 8.27 2.06 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.52% 1.48% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Conservative Standard & Barclays Aggregate Allocation Fund Poor's 500 Index Bond Index 5/31/2005 $ 9,425 $10,000 $10,000 1/31/2006 $ 9,900 $10,872 $10,047 1/31/2007 $10,542 $12,448 $10,477 1/31/2008 $10,820 $12,160 $11,400 1/31/2009 $ 8,617 $ 7,465 $11,695 1/31/2010 $10,819 $ 9,938 $12,690 1/31/2011 $12,015 $12,145 $13,332 1/31/2012 $12,212 $12,654 $14,487 1/31/2013 $13,222 $14,775 $14,862 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class A shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 22 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class B Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 5/12/2005 3.71% 3.71% 5 Years 3.19 3.19 1 Year 7.34 3.34 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.41% 2.38% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Conservative Standard & Barclays Aggregate Allocation Fund Poor's 500 Index Bond Index 5/31/2005 $10,000 $10,000 $10,000 1/31/2006 $10,448 $10,872 $10,047 1/31/2007 $11,027 $12,448 $10,477 1/31/2008 $11,210 $12,160 $11,400 1/31/2009 $ 8,847 $ 7,465 $11,695 1/31/2010 $11,000 $ 9,938 $12,690 1/31/2011 $12,117 $12,145 $13,332 1/31/2012 $12,218 $12,654 $14,487 1/31/2013 $13,115 $14,775 $14,862 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 23 Performance Update | 1/31/13 Class C Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 5/12/2005 3.71% 3.71% 5 Years 3.19 3.19 1 Year 7.34 7.34 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.26% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Conservative Standard & Barclays Aggregate Allocation Fund Poor's 500 Index Bond Index 5/31/2005 $10,000 $10,000 $10,000 1/31/2006 $10,439 $10,872 $10,047 1/31/2007 $11,029 $12,448 $10,477 1/31/2008 $11,223 $12,160 $11,400 1/31/2009 $ 8,843 $ 7,465 $11,695 1/31/2010 $10,985 $ 9,938 $12,690 1/31/2011 $12,128 $12,145 $13,332 1/31/2012 $12,231 $12,654 $14,487 1/31/2013 $13,129 $14,775 $14,862 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 24 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class Y Shares Pioneer Ibbotson Conservative Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Ibbotson Conservative Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 5/12/2005 3.45% 3.45% 5 Years 2.35 2.35 1 Year 7.06 7.06 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.96% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Ibbotson Conservative Standard & Barclays Aggregate Allocation Fund Poor's 500 Index Bond Index 5/31/2005 $ 5,000,000 $ 5,000,000 $ 5,000,000 1/31/2006 $ 5,263,864 $ 5,435,945 $ 5,023,369 1/31/2007 $ 5,591,061 $ 6,224,088 $ 5,238,604 1/31/2008 $ 5,726,576 $ 6,080,128 $ 5,700,033 1/31/2009 $ 4,423,927 $ 3,732,378 $ 5,847,553 1/31/2010 $ 5,330,149 $ 4,969,179 $ 6,344,969 1/31/2011 $ 5,937,406 $ 6,072,375 $ 6,666,058 1/31/2012 $ 6,008,680 $ 6,326,910 $ 7,243,481 1/31/2013 $ 6,433,159 $ 7,387,467 $ 7,430,763 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of the Fund's Class Y shares on October 5, 2005, reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than the performance shown. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 25 Portfolio Summary | 1/31/13 Pioneer Ibbotson Moderate Allocation Fund Target Asset Allocations -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 60% Fixed Income 40% Short Term Bonds 17.00% -------------------------------------------------------------------------------- Large Cap Growth 15.50 -------------------------------------------------------------------------------- Large Cap Value 15.50 -------------------------------------------------------------------------------- International Equities 12.00 -------------------------------------------------------------------------------- Domestic Corporate Bonds 9.00 -------------------------------------------------------------------------------- High-Yield Corporate Bonds 8.00 -------------------------------------------------------------------------------- Mid/Small Cap Growth 6.00 -------------------------------------------------------------------------------- Cash & Cash Equivalents 6.00 -------------------------------------------------------------------------------- Mid/Small Cap Value 6.00 -------------------------------------------------------------------------------- Real Estate Investment Trust (REIT) 3.00 -------------------------------------------------------------------------------- Emerging Markets 2.00 -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) -------------------------------------------------------------------------------- U.S. Stocks -------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund Class Y 6.84% -------------------------------------------------------------------------------- Pioneer Disciplined Value Fund Class Y 3.53 -------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund Class Y 3.52 -------------------------------------------------------------------------------- Pioneer Fundamental Value Fund Class Y 3.45 -------------------------------------------------------------------------------- Pioneer Fund Class Y 3.34 -------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund Class Y 3.27 -------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund Class Y 3.20 -------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund Class Y 2.85 -------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund Class Y 2.42 -------------------------------------------------------------------------------- Pioneer Equity Income Fund Class Y 2.31 -------------------------------------------------------------------------------- Pioneer Research Fund Class Y 2.18 -------------------------------------------------------------------------------- Pioneer Real Estate Shares Class Y 2.12 -------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund Class Y 2.12 -------------------------------------------------------------------------------- Pioneer Multi-Asset Ultrashort Income Fund Class Y 0.87 -------------------------------------------------------------------------------- International Stocks -------------------------------------------------------------------------------- Pioneer International Value Fund Class Y 10.94% -------------------------------------------------------------------------------- Pioneer Global Equity Fund Class Y 8.52 -------------------------------------------------------------------------------- Pioneer Emerging Markets Fund Class Y 4.06 -------------------------------------------------------------------------------- Bonds -------------------------------------------------------------------------------- Pioneer Short Term Income Fund Class Y 11.61% -------------------------------------------------------------------------------- Pioneer Bond Fund Class Y 11.54 -------------------------------------------------------------------------------- Pioneer Global High Yield Fund Class Y 4.59 -------------------------------------------------------------------------------- Pioneer Strategic Income Fund Class Y 2.69 -------------------------------------------------------------------------------- Pioneer High Yield Fund Class Y 2.24 -------------------------------------------------------------------------------- Pioneer Global Aggregate Bond Fund Class Y 1.79 -------------------------------------------------------------------------------- This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 26 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class A Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.20% 4.46% 5 Years 3.19 1.97 1 Year 9.62 3.33 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.50% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Moderate Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 9,425 $ 10,000 $ 10,000 1/31/2005 $ 10,077 $ 10,186 $ 10,772 1/31/2006 $ 11,175 $ 10,369 $ 11,890 1/31/2007 $ 12,183 $ 10,814 $ 13,613 1/31/2008 $ 12,134 $ 11,766 $ 13,299 1/31/2009 $ 8,455 $ 12,071 $ 8,164 1/31/2010 $ 11,158 $ 13,097 $ 10,869 1/31/2011 $ 12,883 $ 13,760 $ 13,282 1/31/2012 $ 12,954 $ 14,952 $ 13,838 1/31/2013 $ 14,200 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of the maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 27 Performance Update | 1/31/13 Class B Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 3.97% 3.97% 5 Years 2.37 2.37 1 Year 8.87 4.87 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.38% 2.30% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Moderate Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,519 $ 10,186 $ 10,772 1/31/2006 $ 11,553 $ 10,369 $ 11,890 1/31/2007 $ 12,486 $ 10,814 $ 13,613 1/31/2008 $ 12,332 $ 11,766 $ 13,299 1/31/2009 $ 8,521 $ 12,071 $ 8,164 1/31/2010 $ 11,162 $ 13,097 $ 10,869 1/31/2011 $ 12,777 $ 13,760 $ 13,282 1/31/2012 $ 12,736 $ 14,952 $ 13,838 1/31/2013 $ 13,866 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 28 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class C Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 3.94% 3.94% 5 Years 2.43 2.43 1 Year 8.83 8.83 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.19% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Moderate Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,653 $ 10,186 $ 10,772 1/31/2006 $ 11,701 $ 10,369 $ 11,890 1/31/2007 $ 12,658 $ 10,814 $ 13,613 1/31/2008 $ 12,517 $ 11,766 $ 13,299 1/31/2009 $ 8,655 $ 12,071 $ 8,164 1/31/2010 $ 11,336 $ 13,097 $ 10,869 1/31/2011 $ 12,993 $ 13,760 $ 13,282 1/31/2012 $ 12,968 $ 14,952 $ 13,838 1/31/2013 $ 14,113 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 29 Performance Update | 1/31/13 Class Y Shares Pioneer Ibbotson Moderate Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Ibbotson Moderate Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.65% 5.65% 5 Years 3.75 3.75 1 Year 9.94 9.94 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.16% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Ibbotson Moderate Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 5,000,000 $ 5,000,000 $ 5,000,000 1/31/2005 $ 5,345,025 $ 5,093,214 $ 5,385,956 1/31/2006 $ 5,944,151 $ 5,184,668 $ 5,944,789 1/31/2007 $ 6,504,958 $ 5,406,815 $ 6,806,710 1/31/2008 $ 6,501,474 $ 5,883,059 $ 6,649,275 1/31/2009 $ 4,569,473 $ 6,035,316 $ 4,081,758 1/31/2010 $ 6,075,295 $ 6,548,703 $ 5,434,335 1/31/2011 $ 7,043,805 $ 6,880,102 $ 6,640,799 1/31/2012 $ 7,107,400 $ 7,476,066 $ 6,919,159 1/31/2013 $ 7,813,689 $ 7,669,361 $ 8,078,994 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of the Fund's Class Y shares on September 23, 2005, reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than the performance shown. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 30 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Portfolio Summary | 1/31/13 Pioneer Ibbotson Growth Allocation Fund Target Asset Allocations -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 75% Fixed Income 25% Large Cap Value 17.50% -------------------------------------------------------------------------------- Large Cap Growth 16.50 -------------------------------------------------------------------------------- International Equities 16.00 -------------------------------------------------------------------------------- Short Term Bonds 12.50 -------------------------------------------------------------------------------- Mid/Small Cap Growth 8.50 -------------------------------------------------------------------------------- Mid/Small Cap Value 8.50 -------------------------------------------------------------------------------- Domestic Corporate Bonds 7.50 -------------------------------------------------------------------------------- High-Yield Corporate Bonds 5.00 -------------------------------------------------------------------------------- Emerging Markets 4.00 -------------------------------------------------------------------------------- Real Estate Investment Trust (REIT) 4.00 -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) -------------------------------------------------------------------------------- U.S. Stocks -------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund Class Y 7.15% -------------------------------------------------------------------------------- Pioneer Disciplined Value Fund Class Y 4.46 -------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund Class Y 4.20 -------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund Class Y 4.16 -------------------------------------------------------------------------------- Pioneer Fundamental Value Fund Class Y 3.55 -------------------------------------------------------------------------------- Pioneer Fund Class Y 3.48 -------------------------------------------------------------------------------- Pioneer Equity Income Fund Class Y 3.42 -------------------------------------------------------------------------------- Pioneer Real Estate Shares Class Y 3.33 -------------------------------------------------------------------------------- Pioneer Research Fund Class Y 3.21 -------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund Class Y 3.10 -------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund Class Y 3.10 -------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund Class Y 2.87 -------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth Fund Class Y 0.00* -------------------------------------------------------------------------------- Pioneer Value Fund Class Y 0.00* -------------------------------------------------------------------------------- Pioneer Independence Fund Class Y 0.00* -------------------------------------------------------------------------------- International Stocks -------------------------------------------------------------------------------- Pioneer International Value Fund Class Y 13.39% -------------------------------------------------------------------------------- Pioneer Global Equity Fund Class Y 9.37 -------------------------------------------------------------------------------- Pioneer Emerging Markets Fund Class Y 5.70 -------------------------------------------------------------------------------- Bonds -------------------------------------------------------------------------------- Pioneer Bond Fund Class Y 9.93% -------------------------------------------------------------------------------- Pioneer Short Term Income Fund Class Y 7.92 -------------------------------------------------------------------------------- Pioneer Strategic Income Fund Class Y 2.91 -------------------------------------------------------------------------------- Pioneer Global High Yield Fund Class Y 2.04 -------------------------------------------------------------------------------- Pioneer Global Aggregate Bond Fund Class Y 1.78 -------------------------------------------------------------------------------- Pioneer High Yield Fund Class Y 0.93 -------------------------------------------------------------------------------- This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. * Rounds to less than 0.01%. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 31 Performance Update | 1/31/13 Class A Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.28% 4.55% 5 Years 2.40 1.20 1 Year 10.23 3.90 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.58% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Growth Allocation Barclays Aggregate Standard & Poor's Fund Bond Index 500 Index 8/31/2004 $ 9,425 $ 10,000 $ 10,000 1/31/2005 $ 10,267 $ 10,186 $ 10,772 1/31/2006 $ 11,702 $ 10,369 $ 11,890 1/31/2007 $ 12,897 $ 10,814 $ 13,613 1/31/2008 $ 12,687 $ 11,766 $ 13,299 1/31/2009 $ 8,159 $ 12,071 $ 8,164 1/31/2010 $ 11,013 $ 13,097 $ 10,869 1/31/2011 $ 12,980 $ 13,760 $ 13,282 1/31/2012 $ 12,961 $ 14,952 $ 13,838 1/31/2013 $ 14,286 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of the maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 32 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class B Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 3.43% 3.43% 5 Years 1.65 1.65 1 Year 9.48 5.48 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.48% 2.39% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Growth Allocation Barclays Aggregate Standard & Poor's Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,467 $ 10,186 $ 10,772 1/31/2006 $ 11,827 $ 10,369 $ 11,890 1/31/2007 $ 12,923 $ 10,814 $ 13,613 1/31/2008 $ 12,594 $ 11,766 $ 13,299 1/31/2009 $ 8,040 $ 12,071 $ 8,164 1/31/2010 $ 10,765 $ 13,097 $ 10,869 1/31/2011 $ 12,599 $ 13,760 $ 13,282 1/31/2012 $ 12,485 $ 14,952 $ 13,838 1/31/2013 $ 13,669 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 33 Performance Update | 1/31/13 Class C Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 4.18% 4.18% 5 Years 1.71 1.71 1 Year 9.57 9.57 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.28% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Growth Allocation Barclays Aggregate Standard & Poor's Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,709 $ 10,186 $ 10,772 1/31/2006 $ 12,098 $ 10,369 $ 11,890 1/31/2007 $ 13,238 $ 10,814 $ 13,613 1/31/2008 $ 12,933 $ 11,766 $ 13,299 1/31/2009 $ 8,273 $ 12,071 $ 8,164 1/31/2010 $ 11,063 $ 13,097 $ 10,869 1/31/2011 $ 12,951 $ 13,760 $ 13,282 1/31/2012 $ 12,849 $ 14,952 $ 13,838 1/31/2013 $ 14,080 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 34 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class Y Shares Pioneer Ibbotson Growth Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Ibbotson Growth Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.79% 5.79% 5 Years 2.92 2.92 1 Year 10.55 10.55 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.32% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Ibbotson Growth Allocation Barclays Aggregate Standard & Poor's Fund Bond Index 500 Index 8/31/2004 $ 5,000,000 $ 5,000,000 $ 5,000,000 1/31/2005 $ 5,445,191 $ 5,093,214 $ 5,385,956 1/31/2006 $ 6,229,118 $ 5,184,668 $ 5,944,789 1/31/2007 $ 6,909,821 $ 5,406,815 $ 6,806,710 1/31/2008 $ 6,837,697 $ 5,883,059 $ 6,649,275 1/31/2009 $ 4,505,503 $ 6,035,316 $ 4,081,758 1/31/2010 $ 6,093,772 $ 6,548,703 $ 5,434,335 1/31/2011 $ 7,207,346 $ 6,880,102 $ 6,640,799 1/31/2012 $ 7,141,078 $ 7,476,066 $ 6,919,159 1/31/2013 $ 7,894,139 $ 7,669,361 $ 8,078,994 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of the Fund's Class Y shares on September 26, 2005, reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than the performance shown. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 35 Portfolio Summary | 1/31/13 Pioneer Ibbotson Aggressive Allocation Fund Target Asset Allocations -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A PIE CHART IN THE PRINTED MATERIAL] Equity 90% Fixed Income 10% International Equities 21.00% -------------------------------------------------------------------------------- Large Cap Growth 19.00 -------------------------------------------------------------------------------- Large Cap Value 19.00 -------------------------------------------------------------------------------- Mid/Small Cap Growth 10.50 -------------------------------------------------------------------------------- Mid/Small Cap Value 10.50 -------------------------------------------------------------------------------- Domestic Corporate Bonds 7.00 -------------------------------------------------------------------------------- Real Estate Investment Trust (REIT) 5.00 -------------------------------------------------------------------------------- Emerging Markets 5.00 -------------------------------------------------------------------------------- Short Term Bond 3.00 -------------------------------------------------------------------------------- Actual Portfolio Holdings (based on total portfolio) -------------------------------------------------------------------------------- U.S. Stocks -------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund Class Y 10.46% -------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund Class Y 4.89 -------------------------------------------------------------------------------- Pioneer Real Estate Shares Class Y 4.47 -------------------------------------------------------------------------------- Pioneer Disciplined Value Fund Class Y 4.34 -------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund Class Y 4.13 -------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund Class Y 3.98 -------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund Class Y 3.76 -------------------------------------------------------------------------------- Pioneer Fund Class Y 3.45 -------------------------------------------------------------------------------- Pioneer Fundamental Value Fund Class Y 3.38 -------------------------------------------------------------------------------- Pioneer Equity Income Fund Class Y 3.35 -------------------------------------------------------------------------------- Pioneer Research Fund Class Y 3.01 -------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund Class Y 2.87 -------------------------------------------------------------------------------- International Stocks -------------------------------------------------------------------------------- Pioneer International Value Fund Class Y 18.37% -------------------------------------------------------------------------------- Pioneer Global Equity Fund Class Y 10.78 -------------------------------------------------------------------------------- Pioneer Emerging Markets Fund Class Y 7.64 -------------------------------------------------------------------------------- Bonds -------------------------------------------------------------------------------- Pioneer Bond Fund Class Y 5.98% -------------------------------------------------------------------------------- Pioneer Short Term Income Fund Class Y 2.75 -------------------------------------------------------------------------------- Pioneer Strategic Income Fund Class Y 2.39 -------------------------------------------------------------------------------- This list excludes temporary cash investments and derivative instruments. The portfolio is actively managed, and current holdings may be different. The holdings listed should not be considered recommendations to buy or sell any security listed. 36 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class A Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund at public offering price, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.26% 4.52% 5 Years 1.57 0.38 1 Year 10.74 4.44 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 1.72% 1.70% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Aggressive Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 9,425 $ 10,000 $ 10,000 1/31/2005 $ 10,436 $ 10,186 $ 10,772 1/31/2006 $ 12,163 $ 10,369 $ 11,890 1/31/2007 $ 13,543 $ 10,814 $ 13,613 1/31/2008 $ 13,126 $ 11,766 $ 13,299 1/31/2009 $ 7,891 $ 12,071 $ 8,164 1/31/2010 $ 10,811 $ 13,097 $ 10,869 1/31/2011 $ 12,957 $ 13,760 $ 13,282 1/31/2012 $ 12,816 $ 14,952 $ 13,838 1/31/2013 $ 14,193 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. NAV results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. POP returns reflect deduction of the maximum 5.75% sales charge. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class A shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 37 Performance Update | 1/31/13 Class B Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 4.05% 4.05% 5 Years 0.78 0.78 1 Year 9.91 5.91 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross Net -------------------------------------------------------------------------------- 2.62% 2.49% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Aggressive Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,962 $ 10,186 $ 10,772 1/31/2006 $ 12,676 $ 10,369 $ 11,890 1/31/2007 $ 13,990 $ 10,814 $ 13,613 1/31/2008 $ 13,455 $ 11,766 $ 13,299 1/31/2009 $ 8,022 $ 12,071 $ 8,164 1/31/2010 $ 10,914 $ 13,097 $ 10,869 1/31/2011 $ 12,961 $ 13,760 $ 13,282 1/31/2012 $ 12,726 $ 14,952 $ 13,838 1/31/2013 $ 13,987 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. "If Redeemed" returns reflect the deduction of applicable contingent deferred sales charge (CDSC). The maximum CDSC for Class B shares is 4% and declines over five years. For more complete information, please see the prospectus. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The net expense ratio reflects contractual expense limitations currently in effect through December 1, 2014, for Class B shares. There can be no assurance that Pioneer will extend the expense limitation beyond such time. Please see the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 38 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Performance Update | 1/31/13 Class C Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $10,000 investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 4.27% 4.27% 5 Years 0.83 0.83 1 Year 9.96 9.96 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 2.41% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $10,000 Investment Pioneer Ibbotson Aggressive Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 10,000 $ 10,000 $ 10,000 1/31/2005 $ 10,841 $ 10,186 $ 10,772 1/31/2006 $ 12,525 $ 10,369 $ 11,890 1/31/2007 $ 13,848 $ 10,814 $ 13,613 1/31/2008 $ 13,342 $ 11,766 $ 13,299 1/31/2009 $ 7,956 $ 12,071 $ 8,164 1/31/2010 $ 10,804 $ 13,097 $ 10,869 1/31/2011 $ 12,858 $ 13,760 $ 13,282 1/31/2012 $ 12,647 $ 14,952 $ 13,838 1/31/2013 $ 13,906 $ 15,339 $ 16,158 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Class C shares held for less than one year are also subject to a 1% contingent deferred sales charge (CDSC). "If Held" results represent the percent change in net asset value per share. Returns would have been lower had sales charges been reflected. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 39 Performance Update | 1/31/13 Class Y Shares Pioneer Ibbotson Aggressive Allocation Fund Investment Returns -------------------------------------------------------------------------------- The mountain chart on the right shows the change in value of a $5 million investment made in Pioneer Ibbotson Aggressive Allocation Fund, compared to that of the Standard & Poor's 500 Index and the Barclays Aggregate Bond Index. Average Annual Total Returns (As of January 31, 2013) -------------------------------------------------------------------------------- If If Period Held Redeemed -------------------------------------------------------------------------------- Life-of-Class 8/9/2004 5.54% 5.54% 5 Years 1.67 1.67 1 Year 11.07 11.07 -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2012) -------------------------------------------------------------------------------- Gross -------------------------------------------------------------------------------- 1.40% -------------------------------------------------------------------------------- [THE FOLLOWING DATA WAS REPRESENTED AS A MOUNTAIN CHART IN THE PRINTED MATERIAL] Value of $5 Million Investment Pioneer Ibbotson Aggressive Barclays Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/31/2004 $ 5,000,000 $ 5,000,000 $ 5,000,000 1/31/2005 $ 5,538,679 $ 5,093,214 $ 5,385,956 1/31/2006 $ 6,482,157 $ 5,184,668 $ 5,944,789 1/31/2007 $ 7,229,275 $ 5,406,815 $ 6,806,710 1/31/2008 $ 7,093,685 $ 5,883,059 $ 6,649,275 1/31/2009 $ 4,260,465 $ 6,035,316 $ 4,081,758 1/31/2010 $ 5,852,453 $ 6,548,703 $ 5,434,335 1/31/2011 $ 7,037,069 $ 6,880,102 $ 6,640,799 1/31/2012 $ 6,939,269 $ 7,476,066 $ 6,919,159 1/31/2013 $ 7,707,502 $ 7,669,361 $ 8,078,994 Call 1-800-225-6292 or visit us.pioneerinvestments.com for the most recent month-end performance results. Current performance may be lower or higher than the performance data quoted. The performance data quoted represents past performance, which is no guarantee of future results. Investment return and principal value will fluctuate, and shares, when redeemed, may be worth more or less than their original cost. Performance shown for periods prior to the inception of the Fund's Class Y shares on September 23, 2005 reflects the NAV performance of the Fund's Class A shares. The performance does not reflect differences in expenses, including the Rule 12b-1 fees applicable to Class A shares. Since fees for Class A shares are generally higher than those of Class Y shares, the performance for Class Y shares prior to their inception would have been higher than the performance shown. Class Y shares are not subject to sales charges and are available for limited groups of eligible investors, including institutional investors. All results are historical and assume the reinvestment of dividends and capital gains. Other share classes are available for which performance and expenses will differ. Performance results shown reflect any applicable expense waivers in effect during the periods shown. Without such waivers Fund performance would be lower. Waivers may not be in effect for all funds. Certain fee waivers are contractual through a specified period. Otherwise, fee waivers can be rescinded at any time. See the prospectus and financial statements for more information. The performance table and graph do not reflect the deduction of fees and taxes that a shareowner would pay on Fund distributions or the redemption of Fund shares. 40 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Conservative Allocation Fund -------------------------------------------------------------------------------- Shares Value -------------------------------------------------------------------------------- MUTUAL FUNDS -- 101.3% PIONEER FUNDS* -- 101.3% 273,904 Pioneer Absolute Return Credit Fund Class Y $ 2,747,261 1,448,758 Pioneer Bond Fund Class Y 14,241,295 83,161 Pioneer Disciplined Growth Fund Class Y 876,516 152,286 Pioneer Disciplined Value Fund Class Y 1,408,643 25,637 Pioneer Emerging Markets Fund Class Y 685,801 23,798 Pioneer Equity Income Fund Class Y 706,318 97,920 Pioneer Floating Rate Fund Class Y 684,460 60,471 Pioneer Fund Class Y 2,071,730 101,315 Pioneer Fundamental Growth Fund Class Y 1,407,263 72,539 Pioneer Fundamental Value Fund Class Y 1,414,517 118,838 Pioneer Global Aggregate Bond Fund Class Y 1,365,444 264,221 Pioneer Global Equity Fund Class Y 2,832,445 404,820 Pioneer Global High Yield Fund Class Y 4,141,311 22,625 Pioneer Growth Opportunities Fund Class Y 720,395 261,610 Pioneer High Yield Fund Class Y 2,775,680 244,843 Pioneer International Value Fund Class Y 4,909,096 59,531 Pioneer Mid Cap Value Fund Class Y 1,421,608 67,505 Pioneer Multi-Asset Ultrashort Income Fund Class Y 681,796 27,433 Pioneer Real Estate Shares Class Y 701,181 123,443 Pioneer Research Fund Class Y 1,413,426 34,855 Pioneer Select Mid Cap Growth Fund Class Y 708,956 1,304,986 Pioneer Short Term Income Fund Class Y 12,684,464 482,649 Pioneer Strategic Income Fund Class Y 5,478,067 -------------------------------------------------------------------------------- TOTAL MUTUAL FUNDS (Cost $58,145,361) $ 66,077,673 -------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 101.3% (Cost $58,145,361) (a) $ 66,077,673 -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- (1.3)% $ (848,936) -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 65,228,737 ================================================================================ * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At January 31, 2013, the net unrealized gain on investments based on cost for federal tax purposes of $59,120,724 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 6,956,949 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value -- ----------- Net unrealized gain $ 6,956,949 =========== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 41 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Conservative Allocation Fund (continued) Purchases and sales of securities (excluding temporary cash investments) for the six months ended January 31, 2013 aggregated $6,878,902 and $3,216,740, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of January 31, 2013, in valuing the Fund's assets: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Mutual Funds $66,077,673 $ -- $ -- $66,077,673 -------------------------------------------------------------------------------- Total $66,077,673 $ -- $ -- $66,077,673 ================================================================================ The accompanying notes are an integral part of these financial statements. 42 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Moderate Allocation Fund -------------------------------------------------------------------------------- Shares Value -------------------------------------------------------------------------------- MUTUAL FUNDS -- 98.3% PIONEER FUNDS* -- 98.3% 553,813 Pioneer Absolute Return Credit Fund Class Y $ 5,554,744 2,288,415 Pioneer Bond Fund Class Y 22,495,121 448,118 Pioneer Disciplined Growth Fund Class Y 4,723,161 744,887 Pioneer Disciplined Value Fund Class Y 6,890,202 295,670 Pioneer Emerging Markets Fund Class Y 7,909,170 151,664 Pioneer Equity Income Fund Class Y 4,501,376 190,114 Pioneer Fund Class Y 6,513,293 493,280 Pioneer Fundamental Growth Fund Class Y 6,851,664 345,271 Pioneer Fundamental Value Fund Class Y 6,732,775 302,850 Pioneer Global Aggregate Bond Fund Class Y 3,479,748 1,549,378 Pioneer Global Equity Fund Class Y 16,609,328 874,595 Pioneer Global High Yield Fund Class Y 8,947,109 200,025 Pioneer Growth Opportunities Fund Class Y 6,368,782 411,486 Pioneer High Yield Fund Class Y 4,365,868 1,063,481 Pioneer International Value Fund Class Y 21,322,802 558,153 Pioneer Mid Cap Value Fund Class Y 13,328,685 167,284 Pioneer Multi-Asset Ultrashort Income Fund Class Y 1,689,569 196,198 Pioneer Oak Ridge Small Cap Growth Fund Class Y 6,229,273 162,014 Pioneer Real Estate Shares Class Y 4,141,083 371,205 Pioneer Research Fund Class Y 4,250,297 203,039 Pioneer Select Mid Cap Growth Fund Class Y 4,129,822 2,328,518 Pioneer Short Term Income Fund Class Y 22,633,191 461,489 Pioneer Strategic Income Fund Class Y 5,237,895 -------------------------------------------------------------------------------- TOTAL MUTUAL FUNDS (Cost $161,378,011) $ 194,904,958 -------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 98.3% (Cost $161,378,011) (a) $ 194,904,958 -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 1.7% $ 3,271,267 -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 198,176,225 ================================================================================ * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At January 31, 2013, the net unrealized gain on investments based on cost for federal tax purposes of $164,355,647 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 30,549,311 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value -- ------------ Net unrealized gain $ 30,549,311 ============ The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 43 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Moderate Allocation Fund (continued) Purchases and sales of securities (excluding temporary cash investments) for the six months ended January 31, 2013 aggregated $8,756,044 and $12,615,099, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of January 31, 2013, in valuing the Fund's assets: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Mutual Funds $194,904,958 $ -- $ -- $194,904,958 -------------------------------------------------------------------------------- Total $194,904,958 $ -- $ -- $194,904,958 ================================================================================ The accompanying notes are an integral part of these financial statements. 44 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Growth Allocation Fund -------------------------------------------------------------------------------- Shares Value -------------------------------------------------------------------------------- MUTUAL FUNDS -- 99.8% PIONEER FUNDS* -- 99.8% 2,180,896 Pioneer Bond Fund Class Y $ 21,438,206 634,755 Pioneer Disciplined Growth Fund Class Y 6,690,320 1,041,327 Pioneer Disciplined Value Fund Class Y 9,632,274 459,542 Pioneer Emerging Markets Fund Class Y 12,292,736 248,741 Pioneer Equity Income Fund Class Y 7,382,622 219,266 Pioneer Fund Class Y 7,512,038 645,741 Pioneer Fundamental Growth Fund Class Y 8,969,340 392,803 Pioneer Fundamental Value Fund Class Y 7,659,666 333,485 Pioneer Global Aggregate Bond Fund Class Y 3,831,742 1,886,817 Pioneer Global Equity Fund Class Y 20,226,681 430,701 Pioneer Global High Yield Fund Class Y 4,406,067 284,489 Pioneer Growth Opportunities Fund Class Y 9,058,133 188,683 Pioneer High Yield Fund Class Y 2,001,924 534 Pioneer Independence Fund Class Y 7,047 1,441,102 Pioneer International Value Fund Class Y 28,894,103 646,498 Pioneer Mid Cap Value Fund Class Y 15,438,383 597 Pioneer Oak Ridge Large Cap Growth Fund Class Y 8,458 210,595 Pioneer Oak Ridge Small Cap Growth Fund Class Y 6,686,402 281,178 Pioneer Real Estate Shares Class Y 7,186,905 605,309 Pioneer Research Fund Class Y 6,930,792 304,571 Pioneer Select Mid Cap Growth Fund Class Y 6,194,967 1,759,775 Pioneer Short Term Income Fund Class Y 17,105,012 553,210 Pioneer Strategic Income Fund Class Y 6,278,933 641 Pioneer Value Fund Class Y 8,137 -------------------------------------------------------------------------------- TOTAL MUTUAL FUNDS (Cost $175,394,571) $ 215,840,888 -------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 99.8% (Cost $175,394,571) (a) $ 215,840,888 -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.2% $ 489,570 -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 216,330,458 ================================================================================ * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At January 31, 2013, the net unrealized gain on investments based on cost for federal tax purposes of $177,134,883 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $39,131,610 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (425,605) ----------- Net unrealized gain $38,706,005 =========== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 45 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Growth Allocation Fund (continued) Purchases and sales of securities (excluding temporary cash investments) for the six months ended January 31, 2013 aggregated $8,924,971 and $12,495,491, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of January 31, 2013, in valuing the Fund's assets: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Mutual Funds $215,840,888 $ -- $ -- $215,840,888 -------------------------------------------------------------------------------- Total $215,840,888 $ -- $ -- $215,840,888 ================================================================================ The accompanying notes are an integral part of these financial statements. 46 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Aggressive Allocation Fund -------------------------------------------------------------------------------- Shares Value -------------------------------------------------------------------------------- MUTUAL FUNDS -- 100.6% PIONEER FUNDS* -- 100.6% 711,368 Pioneer Bond Fund Class Y $ 6,992,751 318,651 Pioneer Disciplined Growth Fund Class Y 3,358,585 548,967 Pioneer Disciplined Value Fund Class Y 5,077,941 333,929 Pioneer Emerging Markets Fund Class Y 8,932,589 132,060 Pioneer Equity Income Fund Class Y 3,919,531 117,739 Pioneer Fund Class Y 4,033,729 316,625 Pioneer Fundamental Growth Fund Class Y 4,397,923 202,589 Pioneer Fundamental Value Fund Class Y 3,950,477 1,175,626 Pioneer Global Equity Fund Class Y 12,602,707 179,672 Pioneer Growth Opportunities Fund Class Y 5,720,768 1,071,606 Pioneer International Value Fund Class Y 21,485,692 512,141 Pioneer Mid Cap Value Fund Class Y 12,229,928 152,175 Pioneer Oak Ridge Small Cap Growth Fund Class Y 4,831,566 204,505 Pioneer Real Estate Shares Class Y 5,227,137 307,157 Pioneer Research Fund Class Y 3,516,952 229,089 Pioneer Select Mid Cap Growth Fund Class Y 4,659,665 330,774 Pioneer Short Term Income Fund Class Y 3,215,126 246,577 Pioneer Strategic Income Fund Class Y 2,798,654 -------------------------------------------------------------------------------- TOTAL MUTUAL FUNDS (Cost $90,829,554) $ 116,951,721 -------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 100.6% (Cost $90,829,554) (a) $ 116,951,721 -------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- (0.6)% $ (685,330) -------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $ 116,266,391 ================================================================================ * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At January 31, 2013, the net unrealized gain on investments based on cost for federal tax purposes of $92,524,320 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $ 24,427,401 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value -- ------------ Net unrealized gain $ 24,427,401 ============ The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 47 Schedule of Investments | 1/31/13 (unaudited) Pioneer Ibbotson Aggressive Allocation Fund (continued) Purchases and sales of securities (excluding temporary cash investments) for the six months ended January 31, 2013 aggregated $3,751,753 and $8,605,344, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels below. Level 1 - quoted prices in active markets for identical securities. Level 2 - other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risks, etc.) See Notes to Financial Statements -- Note 1A. Level 3 - significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) See Notes to Financial Statements -- Note 1A. Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued using fair value methods (other than prices supplied by independent pricing services) as Level 3. See Notes to Financial Statements -- Note 1A. The following is a summary of the inputs used as of January 31, 2013, in valuing the Fund's assets: -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total -------------------------------------------------------------------------------- Mutual Funds $116,951,721 $ -- $ -- $116,951,721 -------------------------------------------------------------------------------- Total $116,951,721 $ -- $ -- $116,951,721 ================================================================================ The accompanying notes are an integral part of these financial statements. 48 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Statement of Assets and Liabilities | 1/31/13 (unaudited) ---------------------------------------------------------------------------------------------------- Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund ---------------------------------------------------------------------------------------------------- ASSETS: Investments in securities of affiliated issuers, at value (at cost $58,145,361, $161,378,011, $175,394,571 and $90,829,554, respectively) $66,077,673 $194,904,958 $215,840,888 $ 116,951,721 Cash 3,294,181 4,195,829 1,467,938 -- Receivables for: Investment Funds sold 92,385 395,379 202,110 321,972 Capital stock sold 8,221 84,551 40,883 61,411 Dividends 146,615 243,679 168,889 38,814 Other assets 27,571 28,961 33,376 34,338 ---------------------------------------------------------------------------------------------------- Total assets $69,646,646 $199,853,357 $217,754,084 $ 117,408,256 ==================================================================================================== LIABILITIES: Payables for: Investments Funds purchased $ 42,027 $ 137,941 $ 980,072 $ -- Capital stock redeemed 4,289,323 1,317,987 215,583 884,225 Due to affiliates 46,857 150,174 160,798 85,401 Due to Pioneer Investment Management, Inc. 6,339 6,705 9,363 24,015 Due to custodian -- -- -- 114,995 Accrued expenses and other liabilities 33,363 64,325 57,810 33,229 ---------------------------------------------------------------------------------------------------- Total liabilities: $ 4,417,909 $ 1,677,132 $ 1,423,626 $ 1,141,865 ==================================================================================================== NET ASSETS: Paid-in capital $61,194,160 $200,381,192 $221,181,695 $ 123,704,996 Undistributed net investment income 636,173 2,420,741 2,349,080 1,126,321 Accumulated net realized loss on investments (4,533,908) (38,152,655) (47,646,634) (34,687,093) Net unrealized gains on investments 7,932,312 33,526,947 40,446,317 26,122,167 ---------------------------------------------------------------------------------------------------- Total net assets $65,228,737 $198,176,225 $216,330,458 $ 116,266,391 ==================================================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Net Assets of Class A shares $42,271,923 $122,447,260 $142,478,984 $ 86,367,289 Net Assets of Class B shares $ 4,153,311 $ 12,989,995 $ 22,017,583 $ 10,898,874 Net Assets of Class C shares $18,688,679 $ 57,865,200 $ 50,097,494 $ 18,277,289 Net Assets of Class Y shares $ 114,824 $ 4,873,770 $ 1,736,397 $ 722,939 Class A Shares outstanding 3,792,860 11,010,279 12,300,735 7,427,562 Class B Shares outstanding 378,746 1,205,143 2,133,956 992,801 Class C Shares outstanding 1,720,419 5,567,255 4,559,565 1,650,993 Class Y Shares outstanding 10,771 433,823 147,185 61,984 Net Asset Value -- Class A share $ 11.15 $ 11.12 $ 11.58 $ 11.63 Net Asset Value -- Class B share $ 10.97 $ 10.78 $ 10.32 $ 10.98 Net Asset Value -- Class C share $ 10.86 $ 10.39 $ 10.99 $ 11.07 Net Asset Value -- Class Y share $ 10.66 $ 11.23 $ 11.80 $ 11.66 MAXIMUM OFFERING PRICE: Class A (100/94.25 x net asset value per share) $ 11.83 $ 11.80 $ 12.29 $ 12.34 ==================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 49 Statement of Operations (unaudited) For the Six Months Ended 1/31/13 ---------------------------------------------------------------------------------------------------- Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund ---------------------------------------------------------------------------------------------------- INVESTMENT INCOME: Dividend income from securities of affiliated issuers $ 1,292,155 $ 3,306,230 $ 3,322,020 $ 1,678,017 Interest 517 794 187 68 ---------------------------------------------------------------------------------------------------- Total Investment Income $ 1,292,672 $ 3,307,024 $ 3,322,207 $ 1,678,085 ==================================================================================================== EXPENSES: Management fees $ 43,284 $ 127,592 $ 137,597 $ 74,994 Transfer agent fees Class A 18,793 71,264 112,581 85,977 Class B 3,749 18,363 33,856 19,295 Class C 6,125 17,491 21,871 12,060 Class Y 142 383 274 299 Distribution fees Class A 55,647 150,820 173,431 105,827 Class B 21,786 72,936 118,733 57,912 Class C 88,117 278,760 236,523 89,465 Shareholder communications expense 14,030 41,128 36,332 26,301 Administrative fees 10,151 29,943 32,288 17,600 Custodian fees 2,918 5,305 2,459 2,012 Registration fees 27,731 30,085 29,585 28,989 Professional fees 23,375 19,305 21,958 21,535 Printing fees 3,430 13,263 8,326 523 Fees and expenses of nonaffiliated trustees 3,250 4,273 3,429 3,440 Insurance expense 445 1,464 1,559 878 Miscellaneous 1,851 4,233 4,252 4,410 ---------------------------------------------------------------------------------------------------- Total expenses $ 324,824 $ 886,608 $ 975,054 $ 551,517 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. $ -- $ (1,428) $ -- $ (136) ---------------------------------------------------------------------------------------------------- Net expenses $ 324,824 $ 885,180 $ 975,054 $ 551,381 ---------------------------------------------------------------------------------------------------- Net investment income $ 967,848 $ 2,421,844 $ 2,347,153 $ 1,126,704 ---------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized gain on investments $ 205,903 $ 1,418,855 $ 1,526,578 $ 1,166,945 Realized gain on distributions from investment company shares $ 540,609 $ 2,496,135 $ 3,026,753 $ 1,723,685 ---------------------------------------------------------------------------------------------------- $ 746,512 $ 3,914,990 $ 4,553,331 $ 2,890,630 ---------------------------------------------------------------------------------------------------- Change in net unrealized gain on investments $ 2,128,512 $ 9,255,034 $ 11,780,947 $ 7,633,450 ---------------------------------------------------------------------------------------------------- Net increase on investments $ 2,875,024 $ 13,170,024 $ 16,334,278 $ 10,524,080 ---------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 3,842,872 $ 15,591,868 $ 18,681,431 $ 11,650,784 ==================================================================================================== The accompanying notes are an integral part of these financial statements. 50 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Statements of Changes in Net Assets ----------------------------------------------------------------------------------------------------- Conservative Moderate Allocation Fund Allocation Fund --------------------------- ---------------------------- Six Months Six Months Ended Year Ended Year 1/31/13 Ended 1/31/13 Ended (unaudited) 7/31/12 (unaudited) 7/31/12 ----------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 967,848 $ 1,498,635 $ 2,421,844 $ 2,977,148 Net realized gain on investments 746,512 444,562 3,914,990 3,159,731 Change in net unrealized gain (loss) on investments 2,128,512 (975,558) 9,255,034 (8,605,957) ----------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $ 3,842,872 $ 967,639 $ 15,591,868 $ 2,469,078 ----------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.23, $0.31, $0.22 and $0.24, respectively) $ (955,483) $ (1,183,335) $ (2,347,138) $ (2,675,027) Class B ($0.13, $0.20, $0.06 and $0.11, respectively) (49,374) (91,836) (76,356) (244,751) Class C ($0.16, $0.23, $0.16 and $0.18, respectively) (270,274) (352,605) (878,923) (951,582) Class Y ($0.16, $0.23, $0.25 and $0.29, respectively) (1,718) (1,682) (113,775) (195,125) ----------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (1,276,849) $ (1,629,458) $ (3,416,192) $ (4,066,485) ----------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sales or exchange of shares $ 10,081,459 $ 15,727,021 $ 17,394,224 $ 35,940,163 Reinvestment of distributions 1,168,623 1,491,380 3,146,733 3,714,500 Cost of shares repurchased (11,951,022) (16,501,428) (28,246,578) (57,872,210) ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from Fund share transactions (700,940) 716,973 (7,705,621) (18,217,547) ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 1,865,083 $ 55,154 $ 4,470,055 $ (24,753,110) NET ASSETS: Beginning of period 63,363,654 63,308,500 193,706,170 218,459,280 ----------------------------------------------------------------------------------------------------- End of period $ 65,228,737 $ 63,363,654 $198,176,225 $ 193,706,170 ---------------------------------------------------------------------------------------------------- Undistributed net investment income, end of period $ 636,173 $ 945,174 $ 2,420,741 $ 3,415,089 ===================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 51 Statements of Changes in Net Assets (continued) ----------------------------------------------------------------------------------------------------- Growth Aggressive Allocation Fund Allocation Fund --------------------------- ----------------------------- Six Months Six Months Ended Year Ended Year 1/31/13 Ended 1/31/13 Ended (unaudited) 7/31/12 (unaudited) 7/31/12 ----------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income: $ 2,347,153 $ 2,187,731 $ 1,126,704 $ 662,809 Net realized gain on investments 4,553,331 3,249,263 2,890,630 2,916,441 Change in net unrealized gain (loss) on investments 11,780,947 (9,518,002) 7,633,450 (8,039,169) ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $ 18,681,431 $ (4,081,008) $ 11,650,784 $ (4,459,919) ----------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income: Class A ($0.17, $0.19, $0.11 and $0.13, respectively) $ (2,100,205) $ (2,327,559) $ (843,947) $ (1,026,414) Class B ($0.06, $0.08, $0.00 and $0.01, respectively) (124,014) (254,128) -- (21,009) Class C ($0.10, $0.11, $0.04 and $0.05, respectively) (463,365) (512,265) (74,121) (84,457) Class Y ($0.20, $0.23, $0.15 and $0.16, respectively) (28,499) (41,853) (16,667) (17,652) ----------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (2,716,083) $ (3,135,805) $ (934,735) $ (1,149,532) ----------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sales or exchange of shares $ 15,899,140 $ 31,220,224 $ 7,152,399 $ 17,689,729 Reinvestment of distributions 2,588,920 2,989,892 904,117 1,113,126 Cost of shares repurchased (25,634,140) (46,561,663) (16,025,438) (30,405,283) ----------------------------------------------------------------------------------------------------- Net decrease in net assets resulting from Fund share transactions (7,146,080) (12,351,547) (7,968,922) (11,602,428) ----------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 8,819,268 $(19,568,360) $ 2,747,127 $ (17,211,879) NET ASSETS: Beginning of period 207,511,190 227,079,550 113,519,264 130,731,143 ----------------------------------------------------------------------------------------------------- End of period $216,330,458 $207,511,190 $116,266,391 $ 113,519,264 ----------------------------------------------------------------------------------------------------- Undistributed net investment income, end of period $ 2,349,080 $ 2,718,010 $ 1,126,321 $ 934,352 ===================================================================================================== The accompanying notes are an integral part of these financial statements. 52 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 ---------------------------------------------------------------------------------------------------- Conservative Allocation Fund ---------------------------------------------------------- '13 Shares '13 Amount (unaudited) (unaudited) '12 Shares '12 Amount ---------------------------------------------------------------------------------------------------- Class A Shares sold 531,622 $ 5,846,773 997,333 $ 10,516,102 Reinvestment of distributions 85,602 931,357 111,770 1,145,640 Less shares repurchased (793,970) (8,793,283) (1,090,725) (11,477,406) ---------------------------------------------------------------------------------------------------- Net increase (decrease) (176,746) $ (2,015,153) 18,378 $ 184,336 ==================================================================================================== Class B Shares sold 14,731 $ 159,873 65,405 $ 672,958 Reinvestment of distributions 4,413 47,263 8,527 85,946 Less shares repurchased (62,021) (669,917) (150,497) (1,547,463) ---------------------------------------------------------------------------------------------------- Net decrease (42,877) $ (462,781) (76,565) $ (788,559) ==================================================================================================== Class C Shares sold 376,574 $ 4,022,981 442,570 $ 4,530,773 Reinvestment of distributions 17,902 189,947 25,946 259,717 Less shares repurchased (231,948) (2,481,815) (337,214) (3,463,432) ---------------------------------------------------------------------------------------------------- Net increase 162,528 $ 1,731,113 131,302 $ 1,327,058 ==================================================================================================== Class Y Shares sold 4,941 $ 51,832 719 $ 7,188 Reinvestment of distributions 5 56 8 77 Less shares repurchased (570) (6,007) (1,291) (13,127) ---------------------------------------------------------------------------------------------------- Net increase (decrease) 4,376 $ 45,881 (564) $ (5,862) ==================================================================================================== ---------------------------------------------------------------------------------------------------- Moderate Allocation Fund ---------------------------------------------------------- '13 Shares '13 Amount (unaudited) (unaudited) '12 Shares '12 Amount ---------------------------------------------------------------------------------------------------- Class A Shares sold 948,784 $ 10,268,052 2,068,964 $ 21,265,053 Reinvestment of distributions 216,402 2,311,185 263,615 2,628,511 Less shares repurchased (1,515,304) (16,364,125) (3,275,964) (33,161,682) ---------------------------------------------------------------------------------------------------- Net decrease (350,118) $ (3,784,888) (943,385) $ (9,268,118) ==================================================================================================== Class B Shares sold 20,616 $ 215,973 43,190 $ 422,180 Reinvestment of distributions 7,129 73,854 24,677 236,900 Less shares repurchased (423,465) (4,384,056) (1,016,431) (10,005,913) ---------------------------------------------------------------------------------------------------- Net decrease (395,720) $ (4,094,229) (948,564) $ (9,346,833) ==================================================================================================== Class C Shares sold 651,629 $ 6,592,641 1,350,846 $ 13,060,006 Reinvestment of distributions 66,219 661,516 77,571 725,290 Less shares repurchased (636,077) (6,432,410) (1,114,511) (10,741,161) ---------------------------------------------------------------------------------------------------- Net increase 81,771 $ 821,747 313,906 $ 3,044,135 ==================================================================================================== Class Y Shares sold 29,074 $ 317,559 117,189 $ 1,192,924 Reinvestment of distributions 9,293 100,177 12,306 123,799 Less shares repurchased (96,930) (1,065,987) (378,802) (3,963,454) ---------------------------------------------------------------------------------------------------- Net decrease (58,563) $ (648,251) (249,307) $ (2,646,731) ==================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 53 Statements of Changes in Net Assets (continued) ---------------------------------------------------------------------------------------------------- Growth Allocation Fund ---------------------------------------------------------- '13 Shares '13 Amount (unaudited) (unaudited) '12 Shares '12 Amount ---------------------------------------------------------------------------------------------------- Class A Shares sold 928,736 $ 10,363,914 2,003,752 $ 21,129,016 Reinvestment of distributions 188,319 2,079,036 225,622 2,306,260 Less shares repurchased (1,372,641) (15,292,441) (2,384,121) (25,028,435) ---------------------------------------------------------------------------------------------------- Net decrease (255,586) $ (2,849,491) (154,747) $ (1,593,159) ==================================================================================================== Class B Shares sold 15,678 $ 156,563 34,878 $ 326,306 Reinvestment of distributions 12,344 121,585 27,418 249,232 Less shares repurchased (512,639) (5,057,280) (1,072,262) (9,989,741) ---------------------------------------------------------------------------------------------------- Net decrease (484,617) $ (4,779,132) (1,009,966) $ (9,414,203) ==================================================================================================== Class C Shares sold 494,529 $ 5,267,657 896,095 $ 8,966,029 Reinvestment of distributions 35,069 367,526 41,731 405,623 Less shares repurchased (447,616) (4,737,310) (1,086,051) (10,818,416) ---------------------------------------------------------------------------------------------------- Net increase (decrease) 81,982 $ 897,873 (148,225) $ (1,446,764) ==================================================================================================== Class Y Shares sold 9,849 $ 111,006 76,808 $ 798,873 Reinvestment of distributions 1,848 20,772 2,764 28,777 Less shares repurchased (48,262) (547,108) (65,844) (725,071) ---------------------------------------------------------------------------------------------------- Net increase (decrease) (36,565) $ (415,330) 13,728 $ 102,579 ==================================================================================================== ---------------------------------------------------------------------------------------------------- Aggressive Allocation Fund ---------------------------------------------------------- '13 Shares '13 Amount (unaudited) (unaudited) '12 Shares '12 Amount ---------------------------------------------------------------------------------------------------- Class A Shares sold 472,617 $ 5,226,404 1,265,738 $ 13,140,808 Reinvestment of distributions 75,759 834,110 100,201 1,013,032 Less shares repurchased (943,334) (10,434,148) (1,931,678) (20,155,382) ---------------------------------------------------------------------------------------------------- Net decrease (394,958) $ (4,373,634) (565,739) $ (6,001,542) ==================================================================================================== Class B Shares sold 4,904 $ 50,617 14,573 $ 141,783 Reinvestment of distributions -- -- 2,120 20,203 Less shares repurchased (225,358) (2,337,199) (507,652) (4,947,628) ---------------------------------------------------------------------------------------------------- Net decrease (220,454) $ (2,286,582) (490,959) $ (4,785,642) ==================================================================================================== Class C Shares sold 173,840 $ 1,832,162 411,387 $ 4,072,579 Reinvestment of distributions 5,431 56,970 7,028 67,759 Less shares repurchased (248,080) (2,619,815) (497,759) (4,886,040) ---------------------------------------------------------------------------------------------------- Net decrease (68,809) $ (730,683) (79,344) $ (745,702) ==================================================================================================== Class Y Shares sold 3,893 $ 43,216 32,610 $ 334,559 Reinvestment of distributions 1,182 13,037 1,196 12,132 Less shares repurchased (54,682) (634,276) (38,940) (416,233) ---------------------------------------------------------------------------------------------------- Net decrease (49,607) $ (578,023) (5,134) $ (69,542) ==================================================================================================== The accompanying notes are an integral part of these financial statements. 54 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Financial Highlights -------------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund --------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 -------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.73 $ 10.85 $ 10.19 $ 9.40 $ 10.48 $ 11.28 -------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.18 $ 0.28 $ 0.26 $ 0.25 $ 0.39 $ 0.33 Net realized and unrealized gain (loss) on investments 0.47 (0.09) 0.65 0.86 (0.94) (0.63) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.65 $ 0.19 $ 0.91 $ 1.11 $ (0.55) $ (0.30) -------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.23) $ (0.31) $ (0.25) $ (0.32) $ (0.31) $ (0.35) Net realized gain -- -- -- -- (0.22) (0.15) -------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.23) $ (0.31) $ (0.25) $ (0.32) $ (0.53) $ (0.50) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.42 $ (0.12) $ 0.66 $ 0.79 $ (1.08) $ (0.80) -------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.15 $ 10.73 $ 10.85 $ 10.19 $ 9.40 $ 10.48 ================================================================================================================================ Total return* 6.15%** 1.85% 9.04% 11.88% (4.44)% (2.88)% Ratio of net expenses to average net assets+ ++ 0.73%*** 0.78% 0.78% 0.78% 0.78% 0.78% Ratio of net investment income to average net assets+ ++ 3.16%*** 2.69% 2.47% 2.55% 4.43% 2.96% Portfolio turnover rate 5% 20% 15% 13% 53% 29% Net assets, end of period (in thousands) $42,272 $42,613 $42,882 $35,986 $25,992 $26,782 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.73%*** 0.82% 0.80% 0.84% 1.09% 0.89% Net investment income 3.16%*** 2.65% 2.45% 2.49% 4.12% 2.86% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.73%*** 0.78% 0.78% 0.78% 0.78% 0.78% Net investment income 3.16%*** 2.69% 2.47% 2.55% 4.43% 2.97% ================================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 55 Financial Highlights (continued) -------------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund --------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 -------------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 10.51 $ 10.61 $ 9.99 $ 9.24 $ 10.31 $ 11.10 -------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.12 $ 0.19 $ 0.17 $ 0.16 $ 0.31 $ 0.22 Net realized and unrealized gain (loss) on investments 0.47 (0.09) 0.64 0.83 (0.93) (0.61) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.59 $ 0.10 $ 0.81 $ 0.99 $ (0.62) $ (0.39) -------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.13) $ (0.20) $ (0.19) $ (0.24) $ (0.23) $ (0.25) Net realized gain -- -- -- -- (0.22) (0.15) -------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.13) $ (0.20) $ (0.19) $ (0.24) $ (0.45) $ (0.40) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.46 $ (0.10) $ 0.62 $ 0.75 $ (1.07) $ (0.79) -------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.97 $ 10.51 $ 10.61 $ 9.99 $ 9.24 $ 10.31 ================================================================================================================================ Total return* 5.60%** 1.04% 8.15% 10.80% (5.31)% (3.72)% Ratio of net expenses to average net assets+ ++ 1.57%*** 1.68% 1.64% 1.68% 1.68% 1.69% Ratio of net investment income to average net assets+ ++ 2.24%*** 1.82% 1.62% 1.67% 3.58% 2.05% Portfolio turnover rate 5% 20% 15% 13% 53% 29% Net assets, end of period (in thousands) $ 4,153 $ 4,429 $ 5,285 $ 6,214 $ 5,957 $ 6,370 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.57%*** 1.71% 1.64% 1.70% 1.90% 1.73% Net investment income 2.24%*** 1.79% 1.62% 1.64% 3.36% 2.01% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.57%*** 1.68% 1.64% 1.68% 1.68% 1.68% Net investment income 2.24%*** 1.82% 1.62% 1.67% 3.58% 2.05% ================================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 56 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 --------------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund --------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 --------------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 10.44 $ 10.56 $ 9.96 $ 9.21 $ 10.30 $ 11.09 --------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.13 $ 0.20 $ 0.18 $ 0.17 $ 0.31 $ 0.23 Net realized and unrealized gain (loss) on investments 0.45 (0.09) 0.63 0.83 (0.95) (0.61) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.58 $ 0.11 $ 0.81 $ 1.00 $ (0.64) $ (0.38) --------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.16) $ (0.23) $ (0.21) $ (0.25) $ (0.23) $ (0.26) Net realized gain -- -- -- -- (0.22) (0.15) --------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.16) $ (0.23) $ (0.21) $ (0.25) $ (0.45) $ (0.41) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.42 $ (0.12) $ 0.60 $ 0.75 $ (1.09) $ (0.79) --------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.86 $ 10.44 $ 10.56 $ 9.96 $ 9.21 $ 10.30 ================================================================================================================================= Total return* 5.59%** 1.16% 8.18% 10.91% (5.53)% (3.63)% Ratio of net expenses to average net assets+ ++ 1.46%*** 1.56% 1.55% 1.59% 1.68% 1.63% Ratio of net investment income to average net assets+ ++ 2.42%*** 1.91% 1.71% 1.73% 3.54% 2.10% Portfolio turnover rate 5% 20% 15% 13% 53% 29% Net assets, end of period (in thousands) $18,689 $16,257 $15,068 $14,063 $11,184 $11,132 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.46%*** 1.56% 1.55% 1.59% 1.80% 1.63% Net investment income 2.42%*** 1.91% 1.71% 1.73% 3.43% 2.10% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.46%*** 1.56% 1.55% 1.59% 1.68% 1.63% Net investment income 2.42%*** 1.91% 1.71% 1.73% 3.54% 2.11% ================================================================================================================================= (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 57 Financial Highlights (continued) ------------------------------------------------------------------------------------------------------------------------------ Conservative Allocation Fund --------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ------------------------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 10.21 $ 10.41 $ 9.79 $ 9.02 $ 10.50 $ 11.30 ------------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ 0.20 $ 0.13 $ 0.24 $ 0.28 $ (0.18) $ 0.28 Net realized and unrealized gain (loss) on investments 0.41 (0.10) 0.65 0.78 (0.97) (0.65) ------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 0.61 $ 0.03 $ 0.89 $ 1.06 $ (1.15) $ (0.37) ------------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.16) $ (0.23) $ (0.27) $ (0.29) $ (0.11) $ (0.28) Net realized gain -- -- -- -- (0.22) (0.15) ------------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.16) $ (0.23) $ (0.27) $ (0.29) $ (0.33) $ (0.43) ------------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.45 $ (0.20) $ 0.62 $ 0.77 $ (1.48) $ (0.80) ------------------------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 10.66 $ 10.21 $ 10.41 $ 9.79 $ 9.02 $ 10.50 ============================================================================================================================== Total return* 6.02%** 0.34% 9.18% 11.89% (10.66)% (3.42)% Ratio of net expenses to average net assets+ ++ 0.71%*** 2.26% 0.82% 0.63% 7.26% 1.25% Ratio of net investment income to average net assets+ ++ 3.77%*** 1.28% 2.36% 2.94% (2.03)% 2.50% Portfolio turnover rate 5% 20% 15% 13% 53% 29% Net assets, end of period (in thousands) $ 115 $ 65 $ 72 $ 119 $ 9 $ 10 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.71%*** 2.26% 0.82% 0.63% 7.26% 1.25% Net investment income (loss) 3.77%*** 1.28% 2.36% 2.94% (2.03)% (2.50)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.71%*** 2.26% 0.82% 0.63% 7.26% 1.23% Net investment income (loss) 3.77%*** 1.28% 2.36% 2.94% (2.03)% 2.52% ============================================================================================================================== (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 58 ----------------------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ---------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ----------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.46 $ 10.74 $ 9.68 $ 8.79 $ 10.89 $ 12.50 ----------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.15 $ 0.18 $ 0.17 $ 0.16 $ 0.27 $ 0.24 Net realized and unrealized gain (loss) on investments 0.73 (0.22) 1.07 1.00 (1.63) (1.10) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.88 $ (0.04) $ 1.24 $ 1.16 $ (1.36) $ (0.86) ----------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.22) $ (0.24) $ (0.18) $ (0.27) $ (0.13) $ (0.31) Net realized gain -- -- -- -- (0.61) (0.44) ----------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.22) $ (0.24) $ (0.18) $ (0.27) $ (0.74) $ (0.75) ----------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.66 $ (0.28) $ 1.06 $ 0.89 $ (2.10) $ (1.61) ----------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.12 $ 10.46 $ 10.74 $ 9.68 $ 8.79 $ 10.89 =================================================================================================================================== Total return* 8.46%** (0.27)% 12.91% 13.26% (11.20)% (7.47)% Ratio of net expenses to average net assets+ ++ 0.65%*** 0.72% 0.71% 0.73% 0.74% 0.65% Ratio of net investment income to average net assets+ ++ 2.72%*** 1.75% 1.59% 1.70% 3.20% 2.03% Portfolio turnover rate 5% 9% 14% 10% 44% 21% Net assets, end of period (in thousands) $122,447 $118,833 $132,166 $125,354 $120,786 $147,004 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.65%*** 0.72% 0.71% 0.73% 0.76% 0.65% Net investment income 2.72%*** 1.75% 1.59% 1.70% 3.18% 2.03% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.65%*** 0.72% 0.71% 0.73% 0.74% 0.65% Net investment income 2.72%*** 1.75% 1.59% 1.70% 3.20% 2.03% =================================================================================================================================== (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 59 Financial Highlights (continued) --------------------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ------------------------------------------------------------ Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 --------------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 10.04 $ 10.26 $ 9.25 $ 8.41 $ 10.39 $ 11.97 --------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.09 $ 0.11 $ 0.08 $ 0.08 $ 0.19 $ 0.13 Net realized and unrealized gain (loss) on investments 0.71 (0.22) 1.02 0.96 (1.53) (1.06) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.80 $ (0.11) $ 1.10 $ 1.04 $ (1.34) $ (0.93) --------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.06) $ (0.11) $ (0.09) $ (0.20) $ (0.03) $ (0.21) Net realized gain -- -- -- -- (0.61) (0.44) --------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.06) $ (0.11) $ (0.09) $ (0.20) $ (0.64) $ (0.65) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.74 $ (0.22) $ 1.01 $ 0.84 $ (1.98) $ (1.58) --------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.78 $ 10.04 $ 10.26 $ 9.25 $ 8.41 $ 10.39 ================================================================================================================================= Total return* 8.00%** (0.99)% 11.89% 12.39% (11.81)% (8.32)% Ratio of net expenses to average net assets+ ++ 1.52%*** 1.52% 1.52% 1.52% 1.52% 1.52% Ratio of net investment income to average net assets+ ++ 1.63%*** 1.11% 0.83% 0.92% 2.44% 1.16% Portfolio turnover rate 5% 9% 14% 10% 44% 21% Net assets, end of period (in thousands) $12,990 $16,072 $26,166 $33,115 $35,197 $50,515 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.54%*** 1.60% 1.53% 1.56% 1.63% 1.52% Net investment income 1.61%*** 1.03% 0.82% 0.88% 2.33% 1.16% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.52%*** 1.52% 1.52% 1.52% 1.52% 1.51% Net investment income 1.63%*** 1.11% 0.83% 0.92% 2.44% 1.17% ================================================================================================================================= (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 60 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 --------------------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund -------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 --------------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 9.77 $ 10.07 $ 9.10 $ 8.29 $ 10.30 $ 11.88 --------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.11 $ 0.10 $ 0.09 $ 0.09 $ 0.19 $ 0.14 Net realized and unrealized gain (loss) on investments 0.67 (0.22) 1.01 0.94 (1.53) (1.05) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.78 $ (0.12) $ 1.10 $ 1.03 $ (1.34) $ (0.91) --------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.16) $ (0.18) $ (0.13) $ (0.22) $ (0.06) $ (0.23) Net realized gain -- -- -- -- (0.61) (0.44) --------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.16) $ (0.18) $ (0.13) $ (0.22) $ (0.67) $ (0.67) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.62 $ (0.30) $ 0.97 $ 0.81 $ (2.01) $ (1.58) --------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.39 $ 9.77 $ 10.07 $ 9.10 $ 8.29 $ 10.30 ================================================================================================================================= Total return* 8.05%** (1.08)% 12.12% 12.43% (11.85)% (8.19)% Ratio of net expenses to average net assets+ ++ 1.34%*** 1.41% 1.40% 1.44% 1.52% 1.39% Ratio of net investment income to average net assets+ ++ 2.09%*** 1.06% 0.89% 0.98% 2.44% 1.28% Portfolio turnover rate 5% 9% 14% 10% 44% 21% Net assets, end of period (in thousands) $57,865 $53,594 $52,059 $43,725 $37,513 $45,594 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.34%*** 1.41% 1.40% 1.44% 1.52% 1.39% Net investment income 2.09%*** 1.06% 0.89% 0.98% 2.44% 1.28% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.34%*** 1.41% 1.40% 1.44% 1.52% 1.39% Net investment income 2.09%*** 1.06% 0.89% 0.98% 2.44% 1.28% ================================================================================================================================= (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 61 Financial Highlights (continued) -------------------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ------------------------------------------------------------------ Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 -------------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 10.58 $ 10.88 $ 9.80 $ 8.89 $ 10.94 $ 12.55 -------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.17 $ 0.22 $ 0.21 $ 0.20 $ 0.29 $ 0.29 Net realized and unrealized gain (loss) on investments 0.73 (0.23) 1.09 1.02 (1.55) (1.11) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.90 $ (0.01) $ 1.30 $ 1.22 $ (1.26) $ (0.82) -------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.25) $ (0.29) $ (0.22) $ (0.31) $ (0.18) $ (0.35) Net realized gain -- -- -- -- (0.61) (0.44) -------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.25) $ (0.29) $ (0.22) $ (0.31) $ (0.79) $ (0.79) -------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.65 $ (0.30) $ 1.08 $ 0.91 $ (2.05) $ (1.61) -------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.23 $ 10.58 $ 10.88 $ 9.80 $ 8.89 $ 10.94 ================================================================================================================================ Total return* 8.59%** 0.00%(b) 13.37% 13.75% (10.09)% (7.10)% Ratio of net expenses to average net assets+ ++ 0.30%*** 0.38% 0.32% 0.33% 0.33% 0.27% Ratio of net investment income to average net assets+ ++ 3.02%*** 2.14% 2.00% 2.10% 3.59% 2.40% Portfolio turnover rate 5% 9% 14% 10% 44% 21% Net assets, end of period (in thousands) $ 4,874 $ 5,208 $ 8,069 $ 8,120 $ 8,015 $17,905 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.30%*** 0.38% 0.32% 0.33% 0.33% 0.27% Net investment income 3.02%*** 2.14% 2.00% 2.10% 3.59% 2.40% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.30%*** 0.38% 0.32% 0.33% 0.33% 0.27% Net investment income 3.02%*** 2.14% 2.00% 2.10% 3.59% 2.40% ================================================================================================================================ (a) Calculated using average shares outstanding for the period. (b) Amount rounds to less than 0.01%. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 62 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 --------------------------------------------------------------------------------------------------------------------------------- Growth Allocation Fund ---------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 --------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.75 $ 11.09 $ 9.77 $ 8.74 $ 11.50 $ 13.47 --------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.14 $ 0.14 $ 0.12 $ 0.11 $ 0.19 $ 0.16 Net realized and unrealized gain (loss) on investments 0.86 (0.29) 1.33 1.10 (2.14) (1.41) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.00 $ (0.15) $ 1.45 $ 1.21 $ (1.95) $ (1.25) --------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.17) $ (0.19) $ (0.13) $ (0.18) $ (0.04) $ (0.25) Net realized gain -- -- -- -- (0.77) (0.47) --------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.17) $ (0.19) $ (0.13) $ (0.18) $ (0.81) $ (0.72) --------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.83 $ (0.34) $ 1.32 $ 1.03 $ (2.76) $ (1.97) --------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.58 $ 10.75 $ 11.09 $ 9.77 $ 8.74 $ 11.50 ================================================================================================================================= Total return* 9.40%** (1.31)% 14.85% 13.90% (15.49)% (9.88)% Ratio of net expenses to average net assets+ ++ 0.67%*** 0.76% 0.76% 0.79% 0.79% 0.78% Ratio of net investment income to average net assets+ ++ 2.49%*** 1.29% 1.11% 1.12% 2.24% 1.24% Portfolio turnover rate 4% 7% 12% 11% 49% 20% Net assets, end of period (in thousands) $142,479 $134,988 $140,979 $125,433 $111,447 $139,670 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.67%*** 0.76% 0.76% 0.80% 0.89% 0.78% Net investment income 2.49%*** 1.29% 1.11% 1.11% 2.14% 1.24% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.67%*** 0.76% 0.76% 0.79% 0.79% 0.77% Net investment income 2.49%*** 1.29% 1.11% 1.12% 2.24% 1.25% ================================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. + Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 63 Financial Highlights (continued) ---------------------------------------------------------------------------------------------------------------------------- Growth Allocation Fund ----------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 9.52 $ 9.80 $ 8.64 $ 7.75 $ 10.33 $ 12.17 ---------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.07 $ 0.06 $ 0.03 $ 0.03 $ 0.11 $ 0.05 Net realized and unrealized gain (loss) on investments 0.79 (0.26) 1.17 0.98 (1.92) (1.28) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.86 $ (0.20) $ 1.20 $ 1.01 $ (1.81) $ (1.23) ---------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.06) $ (0.08) $ (0.04) $ (0.12) $ -- $ (0.14) Net realized gain -- -- -- -- (0.77) (0.47) ---------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.06) $ (0.08) $ (0.04) $ (0.12) $ (0.77) $ (0.61) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.80 $ (0.28) $ 1.16 $ 0.89 $ (2.58) $ (1.84) ---------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.32 $ 9.52 $ 9.80 $ 8.64 $ 7.75 $ 10.33 ============================================================================================================================ Total return* 9.02%** (2.01)% 13.90% 13.03% (16.05)% (10.66)% Ratio of net expenses to average net assets+ ++ 1.56%*** 1.57% 1.57% 1.57% 1.57% 1.58% Ratio of net investment income to average net assets+ ++ 1.41%*** 0.59% 0.35% 0.36% 1.47% 0.44% Portfolio turnover rate 4% 7% 12% 11% 49% 20% Net assets, end of period (in thousands) $22,018 $24,941 $35,567 $39,902 $ 43,390 $61,704 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.56%*** 1.66% 1.61% 1.66% 1.77% 1.64% Net investment income 1.41%*** 0.50% 0.31% 0.27% 1.27% 0.38% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.56%*** 1.57% 1.57% 1.57% 1.57% 1.57% Net investment income 1.41%*** 0.59% 0.35% 0.36% 1.47% 0.45% ============================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 64 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 ---------------------------------------------------------------------------------------------------------------------------- Growth Allocation Fund ----------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 10.18 $ 10.50 $ 9.26 $ 8.30 $ 10.99 $ 12.90 ---------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.10 $ 0.06 $ 0.04 $ 0.04 $ 0.11 $ 0.07 Net realized and unrealized gain (loss) on investments 0.81 (0.27) 1.26 1.04 (2.03) (1.34) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.91 $ (0.22) $ 1.30 $ 1.08 $ (1.92) $ (1.27) ---------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.10) $ (0.11) $ (0.06) $ (0.12) $ -- $ (0.17) Net realized gain -- -- -- -- (0.77) (0.47) ---------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.10) $ (0.11) $ (0.06) $ (0.12) $ (0.77) $ (0.64) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.81 $ (0.32) $ 1.24 $ 0.96 $ (2.69) $ (1.91) ---------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.99 $ 10.18 $ 10.50 $ 9.26 $ 8.30 $ 10.99 ============================================================================================================================ Total return* 9.04%** (1.91)% 14.10% 13.08% (16.08)% (10.43)% Ratio of net expenses to average net assets+ ++ 1.37%*** 1.46% 1.46% 1.51% 1.57% 1.48% Ratio of net investment income to average net assets+ ++ 1.80%*** 0.59% 0.40% 0.40% 1.44% 0.54% Portfolio turnover rate 4% 7% 12% 11% 49% 20% Net assets, end of period (in thousands) $50,097 $45,570 $48,586 $43,087 $ 36,602 $47,898 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.37%*** 1.46% 1.46% 1.51% 1.60% 1.48% Net investment income 1.80%*** 0.59% 0.40% 0.40% 1.40% 0.54% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.37%*** 1.46% 1.46% 1.51% 1.57% 1.47% Net investment income 1.80%*** 0.59% 0.40% 0.40% 1.44% 0.54% ============================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 65 Financial Highlights (continued) ---------------------------------------------------------------------------------------------------------------------------- Growth Allocation Fund ---------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 10.95 $ 11.45 $ 10.07 $ 9.00 $ 11.64 $ 13.55 ---------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.14 $ 0.17 $ 0.17 $ 0.15 $ 0.20 $ 0.22 Net realized and unrealized gain (loss) on investments 0.91 (0.44) 1.37 1.14 (1.97) (1.36) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.05 $ (0.27) $ 1.54 $ 1.29 $ (1.77) $ (1.14) ---------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.20) $ (0.23) $ (0.16) $ (0.22) $ (0.10) $ (0.30) Net realized gain -- -- -- -- (0.77) (0.47) ---------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.20) $ (0.23) $ (0.16) $ (0.22) $ (0.87) $ (0.77) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.85 $ (0.50) $ 1.38 $ 1.07 $ (2.64) $ (1.91) ---------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.80 $ 10.95 $ 11.45 $ 10.07 $ 9.00 $ 11.64 ============================================================================================================================ Total return* 9.64%** (2.28)% 15.39% 14.33% (13.68)% (9.05)% Ratio of net expenses to average net assets+ ++ 0.39%*** 0.50% 0.36% 0.39% 0.39% 0.34% Ratio of net investment income to average net assets+ ++ 2.45%*** 1.60% 1.58% 1.54% 2.44% 1.67% Portfolio turnover rate 4% 7% 12% 11% 49% 20% Net assets, end of period (in thousands) $ 1,736 $ 2,012 $ 1,947 $ 2,508 $ 1,614 $ 2,683 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.39%*** 0.50% 0.36% 0.39% 0.39% 0.34% Net investment income 2.45%*** 1.60% 1.58% 1.54% 2.44% 1.67% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.39%*** 0.50% 0.36% 0.39% 0.39% 0.34% Net investment income 2.45%*** 1.60% 1.58% 1.54% 2.44% 1.67% ============================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 66 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 ---------------------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of period $ 10.60 $ 11.07 $ 9.56 $ 8.45 $ 11.85 $ 14.20 ---------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.12 $ 0.08 $ 0.06 $ 0.04 $ 0.09 $ 0.07 Net realized and unrealized gain (loss) on investments 1.02 (0.42) 1.51 1.16 (2.54) (1.69) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.14 $ (0.34) $ 1.57 $ 1.20 $ (2.45) $ (1.62) ---------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.11) $ (0.13) $ (0.06) $ (0.09) $ -- $ (0.23) Net realized gain -- -- $ -- -- (0.95) (0.50) ---------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.11) $ (0.13) $ (0.06) $ (0.09) $ (0.95) $ (0.73) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.03 $ (0.47) $ 1.51 $ 1.11 $ (3.40) $ (2.35) ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.63 $ 10.60 $ 11.07 $ 9.56 $ 8.45 $ 11.85 ================================================================================================================================== Total return* 10.85%** (3.06)% 16.42% 14.16% (19.05)% (12.03)% Ratio of net expenses to average net assets+ ++ 0.76%*** 0.85% 0.85% 0.85% 0.85% 0.84% Ratio of net investment income to average net assets+ ++ 2.15%*** 0.76% 0.52% 0.44% 1.07% 0.54% Portfolio turnover rate 3% 7% 11% 12% 55% 13% Net assets, end of period (in thousands) $86,367 $82,940 $ 92,878 $85,488 $ 79,480 $102,941 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.76%*** 0.87% 0.85% 0.88% 1.01% 0.84% Net investment income 2.15%*** 0.74% 0.52% 0.41% 0.91% 0.54% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.76%*** 0.85% 0.85% 0.85% 0.85% 0.83% Net investment income 2.15%*** 0.76% 0.52% 0.44% 1.07% 0.55% ================================================================================================================================== (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 67 Financial Highlights (continued) ---------------------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund ----------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of period $ 9.95 $ 10.35 $ 8.96 $ 7.93 $ 11.29 $ 13.55 ---------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(a) $ 0.06 $ 0.01 $ (0.02) $ (0.03) $ 0.02 $ (0.03) Net realized and unrealized gain (loss) on investments 0.97 (0.40) 1.41 1.08 (2.43) (1.61) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.03 $ (0.39) $ 1.39 $ 1.05 $ (2.41) $ (1.64) ---------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ -- $ (0.01) $ -- $ (0.02) $ -- $ (0.12) Net realized gain -- -- -- -- (0.95) (0.50) ---------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ -- $ (0.01) $ -- $ (0.02) $ (0.95) $ (0.62) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.03 $ (0.40) $ 1.39 $ 1.03 $ (3.36) $ (2.26) ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.98 $ 9.95 $ 10.35 $ 8.96 $ 7.93 $ 11.29 ================================================================================================================================== Total return* 10.35%** (3.72)% 15.51% 13.22% (19.69)% (12.72)% Ratio of net expenses to average net assets+ ++ 1.64%*** 1.64% 1.64% 1.64% 1.64% 1.65% Ratio of net investment income to average net assets+ ++ 1.11%*** 0.05% (0.21)% (0.33)% 0.28% (0.28)% Portfolio turnover rate 3% 7% 11% 12% 55% 13% Net assets, end of period (in thousands) $ 10,899 $12,074 $ 17,642 $19,256 $ 20,884 $30,405 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.64%*** 1.77% 1.71% 1.76% 1.89% 1.71% Net investment income (loss) 1.11%*** (0.08)% (0.28)% (0.45)% 0.04% (0.34)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.64%*** 1.64% 1.64% 1.64% 1.64% 1.64% Net investment income (loss) 1.11%*** 0.05% (0.21)% (0.33)% 0.28% (0.27)% ================================================================================================================================== (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 68 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 ---------------------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund ---------------------------------------------------------------------------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of period $ 10.07 $ 10.50 $ 9.08 $ 8.04 $ 11.43 $ 13.73 ---------------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(a) $ 0.08 0.00(b) $ (0.01) $ (0.03) $ 0.02 $ (0.02) Net realized and unrealized gain (loss) on investments 0.96 (0.38) 1.43 1.10 (2.46) (1.62) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.04 $ (0.38) $ 1.42 $ 1.07 $ (2.44) $ (1.64) ---------------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.04) $ (0.05) $ -- $ (0.03) $ -- $ (0.16) Net realized gain -- -- -- -- (0.95) (0.50) ---------------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.04) $ (0.05) $ -- $ (0.03) $ (0.95) $ (0.66) ---------------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.00 $ (0.43) $ 1.42 $ 1.04 $ (3.39) $ (2.30) ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.07 $ 10.07 $ 10.50 $ 9.08 $ 8.04 $ 11.43 ================================================================================================================================== Total return* 10.39%** (3.61)% 15.64% 13.25% (19.71)% (12.61)% Ratio of net expenses to average net assets+ ++ 1.46%*** 1.56% 1.55% 1.58% 1.64% 1.53% Ratio of net investment income to average net assets+ ++ 1.50%*** 0.01% (0.14)% (0.31)% 0.27% (0.16)% Portfolio turnover rate 3% 7% 11% 12% 55% 13% Net assets, end of period (in thousands) $18,277 $17,317 $ 18,899 $18,161 $ 17,171 $22,930 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.46%*** 1.56% 1.55% 1.58% 1.70% 1.53% Net investment income (loss) 1.50%*** 0.01% (0.14)% (0.31)% 0.21% (0.16)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.46%*** 1.56% 1.55% 1.58% 1.64% 1.52% Net investment income (loss) 1.50%*** 0.01% (0.14)% (0.31)% 0.27% (0.15)% ================================================================================================================================== (a) Calculated using average shares outstanding for the period. (b) Amount rounds to less than 0.1%. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions, the complete redemption of the investment at net asset value at the end of each period, and no sales charges. Total return would be reduced if sales charges were taken into account. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 69 Financial Highlights (continued) ---------------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund ----------------------------------------------------------------- Six Months Ended Year Year Year Year Year 1/31/13 Ended Ended Ended Ended Ended (unaudited) 7/31/12 7/31/11 7/31/10 7/31/09 7/31/08 ---------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 10.65 $ 11.24 $ 9.67 $ 8.55 $ 12.02 $ 14.26 ---------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.14 $ 0.12 $ 0.11 $ 0.08 $ 0.13 $ 0.15 Net realized and unrealized gain (loss) on investments 0.88 (0.55) 1.56 1.16 (2.65) (1.60) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.02 $ (0.43) $ 1.67 $ 1.24 $ (2.52) $ (1.45) ---------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.15) $ (0.16) $ (0.10) $ (0.12) $ -- $ (0.29) Net realized gain -- -- -- -- (0.95) (0.50) ---------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.15) $ (0.16) $ (0.10) $ (0.12) $ (0.95) $ (0.79) ---------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.15 $ (0.59) $ 1.57 $ 1.12 $ (3.47) $ (2.24) ---------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 11.66 $ 10.65 $ 11.24 $ 9.67 $ 8.55 $ 12.02 ============================================================================================================================ Total return* 10.97%** (3.76)% 17.32% 14.49% (19.35)% (10.83)% Ratio of net expenses to average net assets+ ++ 0.45%*** 0.55% 0.46% 0.42% 0.43% 0.35% Ratio of net investment income to average net assets+ ++ 2.59%*** 1.11% 0.99% 0.88% 1.58% 1.06% Portfolio turnover rate 3% 7% 11% 12% 55% 13% Net assets, end of period (in thousands) $ 723 $ 1,189 $ 1,311 $ 1,868 $ 1,627 $ 3,105 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.45%*** 0.55% 0.46% 0.42% 0.43% 0.35% Net investment income 2.59%*** 1.11% 0.99% 0.88% 1.58% 1.06% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.45%*** 0.55% 0.46% 0.42% 0.43% 0.35% Net investment income 2.59%*** 1.11% 0.99% 0.88% 1.58% 1.06% ============================================================================================================================ (a) Calculated using average shares outstanding for the period. * Assumes initial investment at net asset value at the beginning of each period, reinvestment of all distributions and the complete redemption of the investment at net asset value at the end of each period. ** Not annualized. + In addition to the expenses which the Fund bears directly, the Fund indirectly bears pro rata shares of the expenses of the funds in which the Fund invests. Because each of the underlying funds bears its own varying expense levels and because the Fund may own differing proportions of each fund at different times, the amount of expenses incurred indirectly by the Fund will vary from time to time. ++ Ratios with no reduction for fees paid indirectly. *** Annualized. The accompanying notes are an integral part of these financial statements. 70 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Notes to Financial Statements | 1/31/13 (unaudited) 1. Organization and Significant Accounting Policies Pioneer Ibbotson Asset Allocation Series (the Trust) is organized as a Delaware statutory trust and is registered with the Securities and Exchange Commission under the Investment Company Act of 1940 (the 1940 Act) as an open-end management investment company. The Trust consists of four separate funds, each issuing four classes of shares (collectively, the Funds, individually, the Fund) as follows: Pioneer Ibbotson Conservative Allocation Fund (Conservative Fund) Pioneer Ibbotson Moderate Allocation Fund (Moderate Fund) Pioneer Ibbotson Growth Allocation Fund (Growth Fund) Pioneer Ibbotson Aggressive Allocation Fund (Aggressive Fund) The investment objective of the Conservative Fund, the Moderate Fund and the Growth Fund is to seek long-term capital growth and current income. The investment objective of the Aggressive Fund is to seek long-term capital growth. Each Fund is a "fund of funds," which means that it seeks to achieve its investment objective by investing exclusively in other Pioneer funds ("underlying funds") managed by Pioneer Investment Management, Inc. (PIM) rather than by direct investment in securities. In the future, the Funds also may invest in regulated investment companies that are not managed by PIM. The Funds indirectly pay a portion of the expenses incurred by the underlying funds. Consequently, an investment in the Funds entails more direct and indirect expenses than direct investment in the underlying funds. Effective as of the close of business on December 31, 2009, the Fund's Class B shares are no longer offered to new or existing shareholders, except that dividends and/or capital gain distributions may continue to be reinvested in Class B shares, and shareholders may exchange their Class B shares for Class B shares of other Pioneer funds, as permitted by existing exchange privileges. Each class of shares represents an interest in the same portfolio of investments of each Fund and has identical rights (based on relative net asset values) to assets and liquidation proceeds. Share classes can bear different rates of class-specific fees and expenses such as transfer agent and distribution fees. Differences in class specific fees and expenses will result in differences in net investment income and, therefore, the payment of different dividends from net investment income earned by each class. The Amended and Restated Declaration of Trust of each Fund gives the Board the flexibility to specify either per-share voting or dollar-weighted voting when submitting matters for shareholder approval. Under per-share voting, each share of a class of a Fund is entitled to one vote. Under dollar-weighted voting, a shareholder's voting Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 71 power is determined not by the number of shares owned, but by the dollar value of the shares on the record date. Each share class has exclusive voting rights with respect to matters affecting only that class, including with respect to the distribution plan for that class. There is no distribution plan for Class Y shares. Class B shares convert to Class A shares approximately eight years after the date of purchase. The financial statements have been prepared in conformity with U.S. generally accepted accounting principles that require the management of the Funds to, among other things, make estimates and assumptions that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from these estimates. The following is a summary of significant accounting policies followed by the Trust in preparation of its financial statements, which are consistent with those policies generally accepted in the investment company industry: A. Security Valuation Security transactions are recorded as of the trade date. The net asset value is computed once daily, on each day the New York Stock Exchange (NYSE) is open, as of the close of regular trading on the NYSE. In computing the net asset value, holdings of mutual fund shares are valued at the net asset value of each fund held. Dividend income and realized capital gain distributions from investment company shares held are recorded on the ex-dividend date. Temporary cash investments are valued at amortized cost which approximates market value. Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and federal income tax purposes. To obtain information on the investment policies of an underlying affiliated fund, please refer to that fund's individual prospectus. B. Federal Income Taxes It is the Fund's policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all of its taxable income and net realized capital gains, if any, to its shareowners. Therefore, no provision for federal income taxes is required. As of January 31, 2013, the Funds did not have any interest and penalties related to uncertain tax positions, which, if applicable, would be recorded as an income tax expense in the Statement of Operations. Tax years for the prior three fiscal years are subject to examination by Federal and State tax authorities. 72 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 The amount and character of income and capital gain distributions to shareowners are determined in accordance with federal income tax rules, which may differ from U.S. generally accepted accounting principles. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Capital accounts within the financial statements are adjusted for permanent book/tax differences to reflect tax character, but are not adjusted for temporary differences. The tax character of current year distributions paid will be determined at the end of the current taxable year. The tax character of distributions paid during the year ended July 31, 2012 was as follows: -------------------------------------------------------------------------------- Ordinary Long-Term Fund Income Capital Gains Total -------------------------------------------------------------------------------- Conservative Fund $1,629,458 $ -- $1,629,458 Moderate Fund 4,066,485 $ -- 4,066,485 Growth Fund 3,135,805 $ -- 3,135,805 Aggressive Fund 1,149,532 $ -- 1,149,532 The following table shows the components of distributable earnings on a federal income tax basis at July 31, 2012: ----------------------------------------------------------------------------------------- Other Net Undistributed Book/Tax Unrealized Ordinary Capital Loss Late Year Temporary Appreciation Fund Income Carryforward Losses Differences Depreciation ----------------------------------------------------------------------------------------- Conservative Fund $ 945,174 $ (4,237,238) $ (67,815) $ (975,367) $5,803,800 Moderate Fund 3,415,089 (38,836,633) (253,376) (2,977,636) 24,271,913 Growth Fund 2,715,458 (50,280,043) (177,058) (1,740,312) 28,665,370 Aggressive Fund 934,352 (35,819,049) (63,908) (1,694,766) 18,488,717 The differences between book-basis and tax-basis net unrealized gains are attributable to the tax deferral of losses on wash sales. C. Fund Shares The Funds record sales and repurchases of Fund shares as of trade date. Pioneer Funds Distributor, Inc. (PFD), the principal underwriter for the Funds and a wholly owned indirect subsidiary of UniCredit S.p.A. (UniCredit), earned the following in underwriting commissions on the sale of Class A shares during the six months ended January 31, 2013: -------------------------------------------------------------------------- Fund Amount -------------------------------------------------------------------------- Conservative Fund $12,080 Moderate Fund $22,447 Growth Fund $26,404 Aggressive Fund $16,101 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 73 D. Class Allocations Income, common expenses and realized and unrealized gains and losses are calculated at the Fund level and allocated daily to each class of shares based on its respective percentage of adjusted net assets at the beginning of the day. Distribution fees are calculated based on the average daily net asset value attributable to Class A, Class B and Class C shares of each Fund, respectively (see Note 4). Class Y shares do not pay distribution fees. All expenses and fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the class of shares based on the number of accounts in each class and the ratable allocation of related out-of-pocket expenses (see Note 3). Distributions to shareowners are recorded as of the ex-dividend date. Distributions paid by each of the Funds with respect to each class of shares are calculated in the same manner and at the same time, except that net investment income dividends to Class A, Class B, Class C and Class Y shares of each Fund can reflect different transfer agent and distribution expense rates. E. Risks Some of the underlying funds can invest in high yield securities or small/emerging growth companies. Investments in these types of securities generally are subject to greater volatility than either higher-grade securities or more-established companies in more developed markets, respectively. The Funds' prospectus contains unaudited information regarding the Fund's principal risks. Please refer to that document when considering the Funds' principal risks. 2. Management Agreement PIM, a wholly owned indirect subsidiary of UniCredit, manages the Funds' portfolios. Management fees are calculated daily at the following annual rates for each Fund: On assets up to $2.5 billion 0.13% on investments in underlying funds managed by Pioneer (and cash); and 0.17% on other investments On the next $1.5 billion 0.11% on investments in underlying funds managed by Pioneer (and cash); and 0.14% on other investments On the next $1.5 billion 0.10% on investments in underlying funds managed by Pioneer (and cash); and 0.12% on other investments On the next $1.5 billion 0.08% on investments in underlying funds managed by Pioneer (and cash); and 0.10% on other investments Over $7 billion 0.08% on investments in underlying funds managed by Pioneer (and cash); and 0.09% on other investments 74 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Each Fund may pay management fees equal to 0.17% of average daily net assets attributable to investments in underlying funds that are not managed by Pioneer. For the six months ended January 31, 2013, the effective management fee for each Fund was equivalent to 0.13% of the Fund's average daily net assets. Fees waived and expenses reimbursed during the period ended January 31, 2013 are reflected in the Statement of Operations. PIM has entered into a sub-advisory agreement with Ibbotson Associates, Inc. PIM, not the Funds, pays a portion of the fee it receives from each Fund to Ibbotson Associates as compensation for its services to the Funds. In addition, under the management and administration agreements, certain other services and costs, including accounting, regulatory reporting and insurance premiums, are paid by the Funds as administrative reimbursements. Included in "Due to affiliates" reflected on the Statements of Assets and Liabilities are the following amounts payable to PIM at January 31, 2013: -------------------------------------------------------------------------------- Fund Amount -------------------------------------------------------------------------------- Conservative Fund $ 2,420 Moderate Fund $23,310 Growth Fund $25,910 Aggressive Fund $10,127 PIM has contractually agreed to limit ordinary operating expenses to the extent required to reduce fund expenses, other than underlying fund fees and expenses, as follows. These expense limitations are in effect through December 1, 2014. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the date referred to above: -------------------------------------------------------------------------------- Fund Class A Class B Class C -------------------------------------------------------------------------------- Conservative Fund 0.78% 1.68% 1.68% Moderate Fund 0.74% 1.52% 1.52% Growth Fund 0.79% 1.57% 1.57% Aggressive Fund 0.85% 1.64% 1.64% 3. Transfer Agent PIMSS, a wholly owned indirect subsidiary of UniCredit, provides substantially all transfer agent and shareowner services to the Funds at negotiated rates. Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities are the following amounts of transfer agent fees payable to PIMSS at January 31, 2013: -------------------------------------------------------------------------------- Fund Amount -------------------------------------------------------------------------------- Conservative Fund $12,611 Moderate Fund $32,936 Growth Fund $36,342 Aggressive Fund $28,211 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 75 4. Distribution Plan The Funds have adopted a Distribution Plan pursuant to Rule 12b-1 of the Investment Company Act of 1940 with respect to Class A, Class B and Class C shares. Pursuant to the Plan, each Fund pays PFD 0.25% of the Fund's average daily net assets attributable to Class A shares as compensation for personal services and/or account maintenance services or distribution services with respect to Class A shares. Pursuant to the Plan, each Fund also pays PFD 1.00% of the average daily net assets attributable to Class B and Class C shares. The fee for Class B and C consists of a 0.25% service fee and a 0.75% distribution fee paid as compensation for personal services and/or account maintenance services or distribution services with regard to Class B and Class C shares. Included in "Due to affiliates" reflected on the Statements of Assets and Liabilities are the following amounts in distribution fees payable to PFD at January 31, 2013. -------------------------------------------------------------------------------- Fund Amount -------------------------------------------------------------------------------- Conservative Fund $31,826 Moderate Fund $93,928 Growth Fund $98,546 Aggressive Fund $47,063 In addition, redemptions of each class of shares (except Class Y shares) may be subject to a contingent deferred sales charge (CDSC). A CDSC of 1.00% may be imposed on redemptions of certain net asset value purchases of Class A shares within 12 months of purchase. Class B shares that are redeemed within five years of purchase are subject to a CDSC at declining rates beginning at 4.00%, based on the lower of cost or market value of shares being redeemed. Redemptions of Class C shares within one year of purchase are subject to a CDSC of 1.00% based on the lower of cost or market value of shares being redeemed. Shares purchased as part of an exchange remain subject to any CDSC that applied to the original purchase of those shares. There is no CDSC for Class Y shares. Proceeds from the CDSCs are paid to PFD. For the six months ended January 31, 2013, the following CDSCs were paid to PFD: -------------------------------------------------------------------------------- Fund Amount -------------------------------------------------------------------------------- Conservative Fund $2,141 Moderate Fund $4,463 Growth Fund $6,715 Aggressive Fund $3,048 76 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 5. Transactions in Underlying Funds -- Affiliated Issuers An affiliated issuer may be considered one in which each Fund owns 5% or more of the outstanding voting securities, or a company which is under common control. For the purposes of this report, each Fund assumes the following to be affiliated issuers: Pioneer Ibbotson Conservative Allocation Fund -------------------------------------------------------------------------------------------- Beginning Acquisitions Dispositions Ending Underlying Funds (Affiliated) (Class Y) Shares Shares Shares Shares -------------------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund 260,971 17,218 (4,285) 273,904 Pioneer Bond Fund 1,232,963 258,306 (42,511) 1,448,758 Pioneer Disciplined Growth Fund 127,353 2,910 (47,102) 83,161 Pioneer Disciplined Value Fund 171,527 8,760 (28,001) 152,286 Pioneer Emerging Markets Fund 25,329 1,166 (858) 25,637 Pioneer Equity Income Fund 29,515 1,008 (6,725) 23,798 Pioneer Floating Rate Fund 91,392 7,173 (645) 97,920 Pioneer Fund 51,083 13,933 (4,545) 60,471 Pioneer Fundamental Growth Fund 98,410 6,481 (3,576) 101,315 Pioneer Fundamental Value Fund 69,949 4,705 (2,115) 72,539 Pioneer Global Aggregate Bond Fund 111,467 8,227 (856) 118,838 Pioneer Global Equity Fund 249,168 20,468 (5,415) 264,221 Pioneer Global High Yield Fund 389,879 22,102 (7,161) 404,820 Pioneer Growth Opportunities Fund 21,501 1,730 (606) 22,625 Pioneer High Yield Fund 248,164 16,125 (2,679) 261,610 Pioneer International Value Fund 205,544 43,370 (4,071) 244,843 Pioneer Mid Cap Value Fund 58,110 2,671 (1,250) 59,531 Pioneer Multi-Asset Ultrashort Income Fund 62,498 5,435 (428) 67,505 Pioneer Real Estate Shares 18,643 8,873 (83) 27,433 Pioneer Research Fund 122,519 5,924 (5,000) 123,443 Pioneer Select Mid Cap Growth Fund 32,519 2,644 (308) 34,855 Pioneer Short Term Income Fund 1,331,421 86,927 (113,362) 1,304,986 Pioneer Strategic Income Fund 443,966 44,369 (5,686) 482,649 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 77 Pioneer Ibbotson Conservative Allocation Fund (continued) ---------------------------------------------------------------------------------------------- Realized Capital Gain Dividend Ending Underlying Funds (Affiliated) (Class Y) Gain (Loss) Distributions Income Value ---------------------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund $ 293 $ -- $ 83,690 $ 2,747,261 Pioneer Bond Fund 30,098 -- 276,028 14,241,295 Pioneer Disciplined Growth Fund 93,032 36,015 8,051 876,516 Pioneer Disciplined Value Fund 22,960 17,698 20,480 1,408,643 Pioneer Emerging Markets Fund (3,138) 2,712 6,668 685,801 Pioneer Equity Income Fund 23,806 -- 14,297 706,318 Pioneer Floating Rate Fund 4 -- 17,140 684,460 Pioneer Fund 14,918 443,236 9,588 2,071,730 Pioneer Fundamental Growth Fund 647 10,411 53,741 1,407,263 Pioneer Fundamental Value Fund 2,557 -- 16,484 1,414,517 Pioneer Global Aggregate Bond Fund 50 10,897 22,781 1,365,444 Pioneer Global Equity Fund 4,516 -- 55,232 2,832,445 Pioneer Global High Yield Fund 965 -- 151,690 4,141,311 Pioneer Growth Opportunities Fund 2,777 -- -- 720,395 Pioneer High Yield Fund 1,556 -- 79,117 2,775,680 Pioneer International Value Fund (1,067) -- 98,734 4,909,096 Pioneer Mid Cap Value Fund (75) -- 15,804 1,421,608 Pioneer Multi-Asset Ultrashort Income Fund 11 -- 5,825 681,796 Pioneer Real Estate Shares 798 -- 8,275 701,181 Pioneer Research Fund 14,147 -- 11,625 1,413,426 Pioneer Select Mid Cap Growth Fund 609 19,640 -- 708,956 Pioneer Short Term Income Fund (4,197) -- 204,964 12,684,464 Pioneer Strategic Income Fund 636 -- 131,941 5,478,067 --------- ------------ ----------- -------------- $ 205,903 $ 540,609 $ 1,292,155 $ 66,077,673 ========= ============ =========== ============== 78 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Pioneer Ibbotson Moderate Allocation Fund ---------------------------------------------------------------------------------------------------- Beginning Acquisitions Dispositions Ending Underlying Funds (Affiliated) (Class Y) Shares Shares Shares Shares --------------------------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund 520,922 32,891 -- 553,813 Pioneer Bond Fund 2,354,173 60,580 (126,338) 2,288,415 Pioneer Disciplined Growth Fund 739,321 -- (291,203) 448,118 Pioneer Disciplined Value Fund 885,956 -- (141,069) 744,887 Pioneer Emerging Markets Fund 293,382 3,026 (738) 295,670 Pioneer Equity Income Fund 174,594 -- (22,930) 151,664 Pioneer Fund 243,002 -- (52,888) 190,114 Pioneer Fundamental Growth Fund 585,548 -- (92,268) 493,280 Pioneer Fundamental Value Fund 400,536 -- (55,265) 345,271 Pioneer Global Aggregate Bond Fund 266,852 35,998 -- 302,850 Pioneer Global Equity Fund 1,479,826 69,552 -- 1,549,378 Pioneer Global High Yield Fund 779,217 95,378 -- 874,595 Pioneer Growth Opportunities Fund 206,619 -- (6,594) 200,025 Pioneer High Yield Fund 419,072 16,214 (23,800) 411,486 Pioneer International Value Fund 914,157 149,324 -- 1,063,481 Pioneer Mid Cap Value Fund 517,071 41,082 -- 558,153 Pioneer Multi-Asset Ultrashort Income Fund 141,624 25,660 -- 167,284 Pioneer Oak Ridge Small Cap Growth Fund 202,273 -- (6,075) 196,198 Pioneer Real Estate Shares 126,821 35,193 -- 162,014 Pioneer Research Fund 398,069 -- (26,864) 371,205 Pioneer Select Mid Cap Growth Fund 211,321 -- (8,282) 203,039 Pioneer Short Term Income Fund 2,419,243 882 (91,607) 2,328,518 Pioneer Strategic Income Fund 405,682 55,807 -- 461,489 --------------------------------------------------------------------------------------------------- Realized Capital Gain Dividend Ending Underlying Funds (Affiliated) (Class Y) Gain (Loss) Distributions Income Value --------------------------------------------------------------------------------------------------- Pioneer Absolute Return Credit Fund $ -- $ -- $ 168,167 $ 5,554,744 Pioneer Bond Fund 95,308 176,212 487,396 22,495,121 Pioneer Disciplined Growth Fund 480,027 92,962 40,375 4,723,161 Pioneer Disciplined Value Fund (2,533) 30,800 104,318 6,890,202 Pioneer Emerging Markets Fund (3,515) -- 76,258 7,909,170 Pioneer Equity Income Fund 7,367 -- 104,633 4,501,376 Pioneer Fund 193,677 1,821,286 64,688 6,513,293 Pioneer Fundamental Growth Fund 445,474 54,019 48,579 6,851,664 Pioneer Fundamental Value Fund 110,004 -- 267,893 6,732,775 Pioneer Global Aggregate Bond Fund -- 26,542 55,857 3,479,748 Pioneer Global Equity Fund -- -- 318,119 16,609,328 Pioneer Global High Yield Fund -- -- 310,596 8,947,109 Pioneer Growth Opportunities Fund 36,604 -- -- 6,368,782 Pioneer High Yield Fund 2,233 -- 130,843 4,365,868 Pioneer International Value Fund -- -- 410,482 21,322,802 Pioneer Mid Cap Value Fund -- -- 143,504 13,328,685 Pioneer Multi-Asset Ultrashort Income Fund -- -- 13,581 1,689,569 Pioneer Oak Ridge Small Cap Growth Fund (10,093) 177,513 -- 6,229,273 Pioneer Real Estate Shares -- -- 44,376 4,141,083 Pioneer Research Fund 45,172 -- 35,573 4,250,297 Pioneer Select Mid Cap Growth Fund 20,543 116,801 -- 4,129,822 Pioneer Short Term Income Fund (1,413) -- 360,114 22,633,191 Pioneer Strategic Income Fund -- -- 120,878 5,237,895 ----------- ----------- ----------- -------------- $ 1,418,855 $ 2,496,135 $ 3,306,230 $ 194,904,958 =========== =========== =========== ============== Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 79 Pioneer Ibbotson Growth Allocation Fund ----------------------------------------------------------------------------------------------- Beginning Acquisitions Dispositions Ending Underlying Funds (Affiliated) (Class Y) Shares Shares Shares Shares ----------------------------------------------------------------------------------------------- Pioneer Bond Fund 2,062,995 122,246 (4,345) 2,180,896 Pioneer Disciplined Growth Fund 967,261 -- (332,506) 634,755 Pioneer Disciplined Value Fund 1,171,488 -- (130,161) 1,041,327 Pioneer Emerging Markets Fund 442,066 17,476 -- 459,542 Pioneer Equity Income Fund 283,723 -- (34,982) 248,741 Pioneer Fund 252,530 -- (33,264) 219,266 Pioneer Fundamental Growth Fund 869,642 -- (223,901) 645,741 Pioneer Fundamental Value Fund 468,235 -- (75,432) 392,803 Pioneer Global Aggregate Bond Fund 307,375 26,110 -- 333,485 Pioneer Global Equity Fund 1,752,987 133,830 -- 1,886,817 Pioneer Global High Yield Fund 444,668 -- (13,967) 430,701 Pioneer Growth Opportunities Fund 288,455 45 (4,011) 284,489 Pioneer High Yield Fund 177,204 11,479 -- 188,683 Pioneer Independence Fund 660 -- (126) 534 Pioneer International Value Fund 1,323,293 117,809 -- 1,441,102 Pioneer Mid Cap Value Fund 649,261 1,260 (4,023) 646,498 Pioneer Oak Ridge Large Cap Growth Fund 597 -- -- 597 Pioneer Oak Ridge Small Cap Growth Fund 213,778 79 (3,262) 210,595 Pioneer Real Estate Shares 232,851 48,327 -- 281,178 Pioneer Research Fund 646,578 -- (41,269) 605,309 Pioneer Select Mid Cap Growth Fund 290,204 14,367 -- 304,571 Pioneer Short Term Income Fund 1,768,363 12,494 (21,082) 1,759,775 Pioneer Strategic Income Fund 409,289 143,921 -- 553,210 Pioneer Value Fund 641 -- -- 641 ----------------------------------------------------------------------------------------------- Realized Capital Gain Dividend Ending Underlying Funds (Affiliated) (Class Y) Gain (Loss) Distributions Income Value ----------------------------------------------------------------------------------------------- Pioneer Bond Fund $ 3,063 $ -- $ 447,607 $ 21,438,206 Pioneer Disciplined Growth Fund 349,423 246,898 56,797 6,690,320 Pioneer Disciplined Value Fund (26,088) 128,708 145,001 9,632,274 Pioneer Emerging Markets Fund -- 46,496 116,897 12,292,736 Pioneer Equity Income Fund (44,725) -- 171,897 7,382,622 Pioneer Fund (65,284) 2,139,931 73,205 7,512,038 Pioneer Fundamental Growth Fund 1,081,520 74,840 65,735 8,969,340 Pioneer Fundamental Value Fund 142,366 -- 306,777 7,659,666 Pioneer Global Aggregate Bond Fund -- 29,948 62,946 3,831,742 Pioneer Global Equity Fund -- -- 381,792 20,226,681 Pioneer Global High Yield Fund 34,239 -- 167,701 4,406,067 Pioneer Growth Opportunities Fund 13,438 -- -- 9,058,133 Pioneer High Yield Fund -- -- 55,936 2,001,924 Pioneer Independence Fund 882 -- -- 7,047 Pioneer International Value Fund -- -- 567,159 28,894,103 Pioneer Mid Cap Value Fund (17,540) -- 171,831 15,438,383 Pioneer Oak Ridge Large Cap Growth Fund -- -- -- 8,458 Pioneer Oak Ridge Small Cap Growth Fund (8,648) 189,679 -- 6,686,402 Pioneer Real Estate Shares -- -- 79,024 7,186,905 Pioneer Research Fund 64,125 -- 58,079 6,930,792 Pioneer Select Mid Cap Growth Fund -- 170,253 -- 6,194,967 Pioneer Short Term Income Fund (193) -- 266,567 17,105,012 Pioneer Strategic Income Fund -- -- 126,985 6,278,933 Pioneer Value Fund -- -- 84 8,137 ---------- ------------ ------------ ------------ $1,526,578 $ 3,026,753 $ 3,322,020 $215,840,888 ========== ============ ============ ============ 80 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Pioneer Ibbotson Aggressive Allocation Fund ----------------------------------------------------------------------------------------------- Beginning Acquisitions Dispositions Ending Underlying Funds (Affiliated) (Class Y) Shares Shares Shares Shares ----------------------------------------------------------------------------------------------- Pioneer Bond Fund 741,519 -- (30,151) 711,368 Pioneer Disciplined Growth Fund 477,390 -- (158,739) 318,651 Pioneer Disciplined Value Fund 641,397 -- (92,430) 548,967 Pioneer Emerging Markets Fund 323,695 10,234 -- 333,929 Pioneer Equity Income Fund 160,219 -- (28,159) 132,060 Pioneer Fund 150,102 -- (32,363) 117,739 Pioneer Fundamental Growth Fund 464,276 -- (147,651) 316,625 Pioneer Fundamental Value Fund 253,376 -- (50,787) 202,589 Pioneer Global Equity Fund 1,137,125 38,501 -- 1,175,626 Pioneer Growth Opportunities Fund 171,235 8,832 (395) 179,672 Pioneer International Value Fund 1,026,973 44,633 -- 1,071,606 Pioneer Mid Cap Value Fund 536,100 -- (23,959) 512,141 Pioneer Oak Ridge Small Cap Growth Fund 157,040 -- (4,865) 152,175 Pioneer Real Estate Shares 184,210 20,295 -- 204,505 Pioneer Research Fund 150,102 -- (32,363) 117,739 Pioneer Select Mid Cap Growth Fund 226,550 2,539 -- 229,089 Pioneer Short Term Income Fund 225,815 104,959 -- 330,774 Pioneer Strategic Income Fund 217,619 35,301 (6,343) 246,577 ----------------------------------------------------------------------------------------------- Realized Capital Gain Dividend Ending Underlying Funds (Affiliated) (Class Y) Gain (Loss) Distributions Income Value ----------------------------------------------------------------------------------------------- Pioneer Bond Fund $ 32,260 $ -- $ 155,683 $ 6,992,751 Pioneer Disciplined Growth Fund 390,688 124,909 28,882 3,358,585 Pioneer Disciplined Value Fund (16,068) 68,627 77,152 5,077,941 Pioneer Emerging Markets Fund -- 34,024 85,518 8,932,589 Pioneer Equity Income Fund 31,782 -- 93,578 3,919,531 Pioneer Fund 242 1,190,414 41,196 4,033,729 Pioneer Fundamental Growth Fund 720,659 37,586 32,940 4,397,923 Pioneer Fundamental Value Fund 104,533 -- 159,838 3,950,477 Pioneer Global Equity Fund -- -- 242,321 12,602,707 Pioneer Growth Opportunities Fund 2,304 -- -- 5,720,768 Pioneer International Value Fund -- -- 431,060 21,485,692 Pioneer Mid Cap Value Fund (93,122) -- 137,719 12,229,928 Pioneer Oak Ridge Small Cap Growth Fund (10,667) 137,935 -- 4,831,566 Pioneer Real Estate Shares -- -- 60,956 5,227,137 Pioneer Research Fund 3,056 -- 28,968 3,516,952 Pioneer Select Mid Cap Growth Fund -- 130,190 -- 4,659,665 Pioneer Short Term Income Fund -- -- 39,012 3,215,126 Pioneer Strategic Income Fund 1,278 -- 63,194 2,798,654 ----------- ------------ ----------- ------------ $ 1,166,945 $ 1,723,685 $ 1,678,017 $116,951,721 =========== ============ =========== ============ Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 81 Pioneer Ibbotson Conservative Allocation Fund Approval of Investment Advisory and Sub-Advisory Agreements Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Ibbotson Conservative Allocation Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. PIM has retained Ibbotson Associates, Inc. (Ibbotson Associates) to serve as the sub-adviser to the Fund pursuant to a sub-advisory agreement between PIM and the sub-adviser. In order for PIM and Ibbotson Associates to remain the investment adviser and sub-adviser of the Fund, respectively, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement and the sub-advisory agreement for the Fund. The contract review process began in March 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement and the sub-advisory agreement. The contract review materials were provided to the Trustees in July 2012 and September 2012. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the Independent Trustees of the Fund were held in July, September, October, and November, 2012 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 13, 2012, based on their evaluation of the information provided by PIM, the sub-adviser and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement and the sub-advisory agreement for another year. In considering the renewal of the investment advisory agreement and the sub-advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreements. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by each of PIM and the sub-adviser to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed the terms of the investment advisory agreement and the sub-advisory agreement. 82 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 With respect to PIM, the Trustees considered that PIM supervises and monitors the performance of the Fund's sub-adviser and the Fund's other service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. The Trustees also considered the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. In addition, the Trustees considered PIM's plans to increase resources in its investment management function and other enhancements to PIM's advisory capabilities. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. With respect to the sub-adviser to the Fund, the Trustees considered the sub- adviser's investment approach for the Fund. They noted that the sub-adviser responsibilities are limited to developing the asset class model, selecting the underlying Pioneer funds in which the Fund invests, determining the allocations to those funds and making asset allocation changes when appropriate. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by each of PIM and the sub-adviser to the Fund were satisfactory and consistent with the terms of the investment advisory agreement and the sub-advisory agreement, respectively. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the fourth quintile of its Morningstar category for the one, three and five year periods ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees considered reasons for the underperformance of the Fund relative to its peer group and the steps recently taken in an effort to improve the performance of the Fund. The Trustees agreed that they would continue to closely monitor the Fund's performance. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 83 Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees also considered that PIM, not the Fund, paid the sub-adviser pursuant to the sub-advisory agreement. The Trustees evaluated the fee under the sub-advisory agreement and the portion of the fee under the investment advisory agreement retained by PIM, and the services provided by the respective parties under such agreements. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2012 was in the third quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2012 was in the fifth quintile relative both to its Morningstar category and Strategic Insight peer group for the comparable period. The Trustees noted that PIM was waiving fees and/or reimbursing expenses in order to limit the ordinary operating expenses of the Fund. They noted the Fund's relatively small asset size compared to most of the other funds in its peer group and considered that non-management fee operating expenses and transfer agency expenses generally are spread over a smaller asset base than the other funds in the peer group, which results in these fees being significantly higher as a percentage of assets. The Trustees also considered information showing significant expense reimbursements by the sponsors of the other funds in the peer group. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing services to the Fund and Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, 84 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 under the investment advisory agreement with the Fund, PIM performs different services for the Fund than it provides to those other clients or services that are broader in scope, including oversight of the Fund's sub-adviser and other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also noted that, with respect to the management of the Fund's investments, the services PIM provides to the Fund may be more limited than the services it provides to other accounts. The Trustees also considered the different entrepreneurial risks associated with PIM's management of the Fund and Pioneer's management of the other client accounts. The Trustees also reviewed management fees charged by the sub-adviser to its other clients. The Trustees noted that the sub-advisory fees paid to the sub-adviser with respect to the Fund were within the range of the fee rates charged by the sub-adviser to its other clients. The Trustees concluded that the management fee payable by the Fund to PIM, as well as the fees payable by PIM to the sub-adviser of the Fund, were reasonable in relation to the nature and quality of the services provided by PIM and the sub-adviser. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. The Trustees further considered the sub-advisory fees received by the sub-adviser with respect to the Fund and the percentage that such fees represented of the sub-adviser's overall revenues (for the 12-month period ended December 31, 2011). They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that the profit margins with respect to the management of the Fund were not unreasonable. Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 85 identify and quantify, rarely identifiable on a Fund-by-Fund basis, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to each of PIM and the sub-adviser from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to each of PIM and the sub-adviser by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between each of PIM and the sub-adviser and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that each of the investment advisory agreement between PIM and the Fund and the sub-advisory agreement between PIM and the sub-adviser, including, in each case, the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of each of the investment advisory agreement and the sub-advisory agreement for the Fund. 86 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Pioneer Ibbotson Moderate Allocation Fund Approval of Investment Advisory and Sub-Advisory Agreements Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Ibbotson Moderate Allocation Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. PIM has retained Ibbotson Associates, Inc. (Ibbotson Associates) to serve as the sub-adviser to the Fund pursuant to a sub-advisory agreement between PIM and the sub-adviser. In order for PIM and Ibbotson Associates to remain the investment adviser and sub-adviser of the Fund, respectively, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement and the sub-advisory agreement for the Fund. The contract review process began in March 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement and the sub-advisory agreement. The contract review materials were provided to the Trustees in July 2012 and September 2012. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the Independent Trustees of the Fund were held in July, September, October, and November, 2012 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 13, 2012, based on their evaluation of the information provided by PIM, the sub-adviser and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement and the sub-advisory agreement for another year. In considering the renewal of the investment advisory agreement and the sub-advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreements. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by each of PIM and the sub-adviser to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed the terms of the investment advisory agreement and the sub-advisory agreement. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 87 With respect to PIM, the Trustees considered that PIM supervises and monitors the performance of the Fund's sub-adviser and the Fund's other service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. The Trustees also considered the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. In addition, the Trustees considered PIM's plans to increase resources in its investment management function and other enhancements to PIM's advisory capabilities. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. With respect to the sub-adviser to the Fund, the Trustees considered the sub-adviser's investment approach for the Fund. They noted that the sub-adviser responsibilities are limited to developing the asset class model, selecting the underlying Pioneer funds in which the Fund invests, determining the allocations to those funds and making asset allocation changes when appropriate. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by each of PIM and the sub-adviser to the Fund were satisfactory and consistent with the terms of the investment advisory agreement and the sub-advisory agreement, respectively. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the fifth quintile of its Morningstar category for the one year period ended June 30, 2012 and in the fourth quintile of its Morningstar category for the three and five year periods ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees considered reasons for the 88 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 underperformance of the Fund relative to its peer group and the steps recently taken in an effort to improve the performance of the Fund. The Trustees agreed that they would continue to closely monitor the Fund's performance. Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees also considered that PIM, not the Fund, paid the sub-adviser pursuant to the sub-advisory agreement. The Trustees evaluated the fee under the sub-advisory agreement and the portion of the fee under the investment advisory agreement retained by PIM, and the services provided by the respective parties under such agreements. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2012 was in the third quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2012 was in the fifth quintile relative both to its Morningstar category and Strategic Insight peer group for the comparable period. The Trustees noted that PIM was waiving fees and/or reimbursing expenses in order to limit the ordinary operating expenses of the Fund.They noted the Fund's relatively small asset size compared to most of the other funds in its peer group and considered that non-management fee operating expenses and transfer agency expenses generally are spread over a smaller asset base than the other funds in the peer group, which results in these fees being significantly higher as a percentage of assets. The Trustees also considered information showing significant expense reimbursements by the sponsors of the other funds in the peer group. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing services to the Fund and Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 89 for Fund and non-Fund services. In evaluating the fees associated with Pioneer's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs different services for the Fund than it provides to those other clients or services that are broader in scope, including oversight of the Fund's sub-adviser and other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also noted that, with respect to the management of the Fund's investments, the services PIM provides to the Fund may be more limited than the services it provides to other accounts. The Trustees also considered the different entrepreneurial risks associated with PIM's management of the Fund and Pioneer's management of the other client accounts. The Trustees also reviewed management fees charged by the sub-adviser to its other clients. The Trustees noted that the sub-advisory fees paid to the sub-adviser with respect to the Fund were within the range of the fee rates charged by the sub-adviser to its other clients. The Trustees concluded that the management fee payable by the Fund to PIM, as well as the fees payable by PIM to the sub-adviser of the Fund, were reasonable in relation to the nature and quality of the services provided by PIM and the sub-adviser. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. The Trustees further considered the sub-advisory fees received by the sub-adviser with respect to the Fund and the percentage that such fees represented of the sub-adviser's overall revenues (for the 12-month period ended December 31, 2011). They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that the profit margins with respect to the management of the Fund were not unreasonable. 90 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, rarely identifiable on a Fund-by-Fund basis, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to each of PIM and the sub-adviser from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to each of PIM and the sub-adviser by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between each of PIM and the sub-adviser and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that each of the investment advisory agreement between PIM and the Fund and the sub-advisory agreement between PIM and the sub-adviser, including, in each case, the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of each of the investment advisory agreement and the sub-advisory agreement for the Fund. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 91 Pioneer Ibbotson Growth Allocation Fund Approval of Investment Advisory and Sub-Advisory Agreements Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Ibbotson Growth Allocation Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. PIM has retained Ibbotson Associates, Inc. (Ibbotson Associates) to serve as the sub-adviser to the Fund pursuant to a sub-advisory agreement between PIM and the sub-adviser. In order for PIM and Ibbotson Associates to remain the investment adviser and sub-adviser of the Fund, respectively, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement and the sub-advisory agreement for the Fund. The contract review process began in March 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement and the sub-advisory agreement. The contract review materials were provided to the Trustees in July 2012 and September 2012. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the Independent Trustees of the Fund were held in July, September, October, and November, 2012 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 13, 2012, based on their evaluation of the information provided by PIM, the sub-adviser and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement and the sub-advisory agreement for another year. In considering the renewal of the investment advisory agreement and the sub-advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreements. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by each of PIM and the sub-adviser to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed the terms of the investment advisory agreement and the sub-advisory agreement. 92 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 With respect to PIM, the Trustees considered that PIM supervises and monitors the performance of the Fund's sub-adviser and the Fund's other service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. The Trustees also considered the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. In addition, the Trustees considered PIM's plans to increase resources in its investment management function and other enhancements to PIM's advisory capabilities. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. With respect to the sub-adviser to the Fund, the Trustees considered the sub-adviser's investment approach for the Fund. They noted that the sub-adviser responsibilities are limited to developing the asset class model, selecting the underlying Pioneer funds in which the Fund invests, determining the allocations to those funds and making asset allocation changes when appropriate. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by each of PIM and the sub-adviser to the Fund were satisfactory and consistent with the terms of the investment advisory agreement and the sub-advisory agreement, respectively. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the fourth quintile of its Morningstar category for the one, three and five year periods ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees considered reasons for the underperformance of the Fund relative to its peer group and the steps recently taken in an effort to improve the performance of the Fund. The Trustees agreed that they would continue to closely monitor the Fund's performance. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 93 Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees also considered that PIM, not the Fund, paid the sub-adviser pursuant to the sub-advisory agreement. The Trustees evaluated the fee under the sub-advisory agreement and the portion of the fee under the investment advisory agreement retained by PIM, and the services provided by the respective parties under such agreements. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2012 was in the fourth quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees noted that the Fund's management fee was only two basis points higher than the median management fee paid by other funds in the Fund's Morningstar category, and less than one basis point higher than the management fee of the fund at the bottom of the third quintile of management fees paid by other funds in the Fund's Morningstar category. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2012 was in the fifth quintile relative both to its Morningstar category and Strategic Insight peer group for the comparable period. The Trustees noted that PIM was waiving fees and/or reimbursing expenses in order to limit the ordinary operating expenses of the Fund. They noted the Fund's relatively small asset size compared to most of the other funds in its peer group and noted the lower average account size of shareholders in the Fund. The Trustees considered that non-management fee operating expenses and transfer agency expenses generally are spread over a smaller asset base than the other funds in the peer group, which results in these fees being significantly higher as a percentage of assets. The Trustees also considered information showing significant expense reimbursements by the sponsors of the other funds in the peer group. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer") to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing 94 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 services to the Fund and Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer's client accounts, the Trustees took into account the respective demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs different services for the Fund than it provides to those other clients or services that are broader in scope, including oversight of the Fund's sub-adviser and other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also noted that, with respect to the management of the Fund's investments, the services PIM provides to the Fund may be more limited than the services it provides to other accounts. The Trustees also considered the different entrepreneurial risks associated with PIM's management of the Fund and Pioneer's management of the other client accounts. The Trustees also reviewed management fees charged by the sub-adviser to its other clients. The Trustees noted that the sub-advisory fees paid to the sub- adviser with respect to the Fund were within the range of the fee rates charged by the sub-adviser to its other clients. The Trustees concluded that the management fee payable by the Fund to PIM, as well as the fees payable by PIM to the sub-adviser of the Fund, were reasonable in relation to the nature and quality of the services provided by PIM and the sub-adviser. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. The Trustees further considered the sub-advisory fees received by the sub-adviser with respect to the Fund and the percentage that such fees represented of the sub-adviser's overall revenues (for the 12-month period ended December 31, 2011). They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that the profit margins with respect to the management of the Fund were not unreasonable. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 95 Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, rarely identifiable on a Fund-by-Fund basis, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to each of PIM and the sub-adviser from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to each of PIM and the sub-adviser by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between each of PIM and the sub-adviser and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that each of the investment advisory agreement between PIM and the Fund and the sub-advisory agreement between PIM and the sub-adviser, including, in each case, the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of each of the investment advisory agreement and the sub-advisory agreement for the Fund. 96 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Pioneer Ibbotson Aggressive Allocation Fund Approval of Investment Advisory and Sub-Advisory Agreements Pioneer Investment Management, Inc. (PIM) serves as the investment adviser to Pioneer Ibbotson Aggressive Allocation Fund (the Fund) pursuant to an investment advisory agreement between PIM and the Fund. PIM has retained Ibbotson Associates, Inc. (Ibbotson Associates) to serve as the sub-adviser to the Fund pursuant to a sub-advisory agreement between PIM and the sub-adviser. In order for PIM and Ibbotson Associates to remain the investment adviser and sub-adviser of the Fund, respectively, the Trustees of the Fund must determine annually whether to renew the investment advisory agreement and the sub-advisory agreement for the Fund. The contract review process began in March 2012 as the Trustees of the Fund agreed on, among other things, an overall approach and timeline for the process. In July 2012, the Trustees approved the format of the contract review materials and submitted their formal request to PIM to furnish information necessary to evaluate the terms of the investment advisory agreement and the sub-advisory agreement. The contract review materials were provided to the Trustees in July 2012 and September 2012. After reviewing and discussing the materials, the Trustees submitted a request for additional information to PIM, and materials were provided in response to this request. Meetings of the Independent Trustees of the Fund were held in July, September, October, and November, 2012 to review and discuss the contract review materials. In addition, the Trustees took into account the information related to the Fund provided to the Trustees at each regularly scheduled meeting. At a meeting held on November 13, 2012, based on their evaluation of the information provided by PIM, the sub-adviser and third parties, the Trustees of the Fund, including the Independent Trustees voting separately, unanimously approved the renewal of the investment advisory agreement and the sub-advisory agreement for another year. In considering the renewal of the investment advisory agreement and the sub-advisory agreement, the Trustees considered various factors that they determined were relevant, including the factors described below. The Trustees did not identify any single factor as the controlling factor in determining to approve the renewal of the agreements. Nature, Extent and Quality of Services The Trustees considered the nature, extent and quality of the services that had been provided by each of PIM and the sub-adviser to the Fund, taking into account the investment objective and strategy of the Fund. The Trustees also reviewed the terms of the investment advisory agreement and the sub-advisory agreement. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 97 With respect to PIM, the Trustees considered that PIM supervises and monitors the performance of the Fund's sub-adviser and the Fund's other service providers and provides the Fund with personnel (including Fund officers) and other resources that are necessary for the Fund's business management and operations. The Trustees considered the non-investment resources and personnel of PIM involved in PIM's services to the Fund, including PIM's compliance and legal resources and personnel. The Trustees also considered the substantial attention and high priority given by PIM's senior management to the Pioneer fund complex. In addition, the Trustees considered PIM's plans to increase resources in its investment management function and other enhancements to PIM's advisory capabilities. The Trustees also considered that, as administrator, PIM is responsible for the administration of the Fund's business and other affairs. The Trustees considered the fees paid to PIM for the provision of administration services. With respect to the sub-adviser to the Fund, the Trustees considered the sub-adviser's investment approach for the Fund. They noted that the sub-adviser responsibilities are limited to developing the asset class model, selecting the underlying Pioneer funds in which the Fund invests, determining the allocations to those funds and making asset allocation changes when appropriate. Based on these considerations, the Trustees concluded that the nature, extent and quality of services that had been provided by each of PIM and the sub- adviser to the Fund were satisfactory and consistent with the terms of the investment advisory agreement and the sub-advisory agreement, respectively. Performance of the Fund The Trustees considered the performance results of the Fund over various time periods. They reviewed information comparing the Fund's performance with the performance of its peer group of funds as classified by Morningstar, Inc. (Morningstar), an independent provider of investment company data, and with the performance of the Fund's benchmark index. The Trustees considered that the Fund's annualized total return was in the fifth quintile of its Morningstar category for the one and three year periods ended June 30, 2012, and in the fourth quintile of its Morningstar category for the five year period ended June 30, 2012. (In all quintile rankings referred to throughout this disclosure, first quintile is most favorable to the Fund's shareowners. Thus, highest relative performance would be first quintile and lowest relative expenses would also be first quintile.) The Trustees considered reasons for the underperformance of the Fund relative to its peer group and the steps recently taken in an effort to improve the performance of the Fund. The Trustees agreed that they would continue to closely monitor the Fund's performance. 98 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Management Fee and Expenses The Trustees considered information showing the fees and expenses of the Fund in comparison to the management fees and expense ratios of its peer group of funds as classified by Morningstar and also to the expense ratios of a peer group of funds selected on the basis of criteria determined by the Independent Trustees for this purpose using data provided by Strategic Insight Mutual Trust Research and Consulting, LLC (Strategic Insight), an independent third party. The Trustees also considered that PIM, not the Fund, paid the sub-adviser pursuant to the sub-advisory agreement. The Trustees evaluated the fee under the sub-advisory agreement and the portion of the fee under the investment advisory agreement retained by PIM, and the services provided by the respective parties under such agreements. The Trustees considered that the Fund's management fee for the twelve months ended June 30, 2012 was in the second quintile relative to the management fees paid by other funds in its Morningstar peer group for the comparable period. The Trustees also considered the breakpoints in the management fee schedule and the reduced fee rates above certain asset levels. The Trustees considered that the Fund's expense ratio for the twelve months ended June 30, 2012 was in the fifth quintile relative both to its Morningstar category and Strategic Insight peer group for the comparable period. The Trustees noted that PIM was waiving fees and/or reimbursing expenses in order to limit the ordinary operating expenses of the Fund. They noted the Fund's relatively small asset size compared to most of the other funds in its peer group. The Trustees noted the lower average account size of shareholders in the Fund. The Trustees considered that non-management fee operating expenses and transfer agency expenses generally are spread over a smaller asset base than the other funds in the peer group, which results in these fees being significantly higher as a percentage of assets. The Trustees also considered information showing significant expense reimbursements by the sponsors of the other funds in the peer group. The Trustees reviewed management fees charged by PIM and PIM's affiliate, Pioneer Institutional Asset Management, Inc. (together with PIM, "Pioneer"), to institutional and other clients, including publicly offered European funds sponsored by affiliates of Pioneer, unaffiliated U.S. registered investment companies (in a sub-advisory capacity), and unaffiliated foreign and domestic separate accounts. The Trustees also considered PIM's costs in providing services to the Fund and Pioneer's costs in providing services to the other clients and considered the differences in management fees and profit margins for Fund and non-Fund services. In evaluating the fees associated with Pioneer's client accounts, the Trustees took into account the respective Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 99 demands, resources and complexity associated with the Fund and client accounts. The Trustees noted that in some instances the fee rates for those clients were lower than the management fee for the Fund and considered that, under the investment advisory agreement with the Fund, PIM performs different services for the Fund than it provides to those other clients or services that are broader in scope, including oversight of the Fund's sub-adviser and other service providers and activities related to compliance and the extensive regulatory and tax regimes to which the Fund is subject. The Trustees also noted that, with respect to the management of the Fund's investments, the services PIM provides to the Fund may be more limited than the services it provides to other accounts. The Trustees also considered the different entrepreneurial risks associated with PIM's management of the Fund and Pioneer's management of the other client accounts. The Trustees also reviewed management fees charged by the sub-adviser to its other clients. The Trustees noted that the sub-advisory fees paid to the sub-adviser with respect to the Fund were within the range of the fee rates charged by the sub-adviser to its other clients. The Trustees concluded that the management fee payable by the Fund to PIM, as well as the fees payable by PIM to the sub-adviser of the Fund, were reasonable in relation to the nature and quality of the services provided by PIM and the sub-adviser. Profitability The Trustees considered information provided by PIM regarding the profitability of PIM with respect to the advisory services provided by PIM to the Fund, including the methodology used by PIM in allocating certain of its costs to the management of the Fund. The Trustees also considered PIM's profit margin in connection with the overall operation of the Fund. The Trustees further considered the sub-advisory fees received by the sub-adviser with respect to the Fund and the percentage that such fees represented of the sub-adviser's overall revenues (for the 12-month period ended December 31, 2011). They further reviewed the financial results realized by PIM and its affiliates from non-fund businesses. The Trustees considered PIM's profit margins with respect to the Fund in comparison to the limited industry data available and noted that the profitability of any adviser was affected by numerous factors, including its organizational structure and method for allocating expenses. The Trustees concluded that the profit margins with respect to the management of the Fund were not unreasonable. 100 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 Economies of Scale The Trustees considered PIM's views relating to economies of scale in connection with the Pioneer Funds as fund assets grow and the extent to which any such economies of scale are shared with funds and fund shareholders. The Trustees noted the breakpoints in the management fee schedule. The Trustees recognize that economies of scale are difficult to identify and quantify, rarely identifiable on a Fund-by-Fund basis, and that, among other factors that may be relevant, are the following: fee levels, expense subsidization, investment by PIM in research and analytical capabilities and PIM's commitment and resource allocation to the Funds. The Trustees noted that profitability also may be an indicator of the availability of any economies of scale, although profitability may vary for other reasons particularly, for example during the recent difficult periods for financial markets, as the level of services was maintained notwithstanding a significant decline in PIM's fee revenues from the Funds. Accordingly, the Trustees concluded that economies of scale, if any, were being appropriately shared with the Fund. Other Benefits The Trustees considered the other benefits to each of PIM and the sub-adviser from its relationship with the Fund. The Trustees considered the character and amount of fees paid by the Fund, other than under the investment advisory agreement, for services provided by PIM and its affiliates. The Trustees further considered the revenues and profitability of PIM's businesses other than the fund business. The Trustees considered the intangible benefits to each of PIM and the sub-adviser by virtue of its relationship with the Fund and the other Pioneer funds. The Trustees concluded that the receipt of these benefits was reasonable in the context of the overall relationship between each of PIM and the sub-adviser and the Fund. Conclusion After consideration of the factors described above as well as other factors, the Trustees, including all of the Independent Trustees, concluded that each of the investment advisory agreement between PIM and the Fund and the sub-advisory agreement between PIM and the sub-adviser, including in each case the fees payable thereunder, was fair and reasonable and voted to approve the proposed renewal of each of the investment advisory agreement and the sub-advisory agreement for the Fund. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 101 Trustees, Officers and Service Providers Trustees Officers Thomas J. Perna, Chairman John F. Cogan, Jr., President* David R. Bock Daniel K. Kingsbury, Executive John F. Cogan, Jr. Vice President Benjamin M. Friedman Mark E. Bradley, Treasurer** Margaret B.W. Graham Christopher J. Kelley, Secretary Daniel K. Kingsbury Marguerite A. Piret Stephen K. West Investment Adviser and Administrator Pioneer Investment Management, Inc. Investment Sub-Adviser Ibbotson Associates, Inc. Custodian and Sub-Administrator Brown Brothers Harriman & Co. Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Proxy Voting Policies and Procedures of the Fund are available without charge, upon request, by calling our toll free number (1-800-225-6292). Information regarding how the Fund voted proxies relating to portfolio securities during the most recent 12-month period ended June 30 is publicly available to shareowners at us.pioneerinvestments.com. This information is also available on the Securities and Exchange Commission's web site at www.sec.gov. * Chief Executive Officer of the Fund. ** Chief Financial and Accounting Officer of the Fund. 102 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 103 This page for your notes. 104 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 105 This page for your notes. 106 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 This page for your notes. Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 107 This page for your notes. 108 Pioneer Ibbotson Asset Allocation Series | Semiannual Report | 1/31/13 How to Contact Pioneer We are pleased to offer a variety of convenient ways for you to contact us for assistance or information. Call us for: -------------------------------------------------------------------------------- Account Information, including existing accounts, new accounts, prospectuses, applications and service forms 1-800-225-6292 FactFone(SM) for automated fund yields, prices, account information and transactions 1-800-225-4321 Retirement plans information 1-800-622-0176 Write to us: -------------------------------------------------------------------------------- PIMSS, Inc. P.O. Box 55014 Boston, Massachusetts 02205-5014 Our toll-free fax 1-800-225-4240 Our internet e-mail address ask.pioneer@pioneerinvestments.com (for general questions about Pioneer only) Visit our web site: us.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete schedule of investments with the Securities and Exchange Commission for the first and third quarters for each fiscal year on Form N-Q. Shareholders may view the filed Form N-Q by visiting the Commission's web site at http://www.sec.gov. The filed form may also be viewed and copied at the Commission's Public Reference Room in Washington, DC. Information regarding the operations of the Public Reference Room may be obtained by calling 1-800-SEC-0330. [LOGO] PIONEER Investments(R) Pioneer Investment Management, Inc. 60 State Street Boston, MA 02109 us.pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2013 Pioneer Investments 19016-07-0313 ITEM 2. CODE OF ETHICS. (a) Disclose whether, as of the end of the period covered by the report, the registrant has adopted a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party. If the registrant has not adopted such a code of ethics, explain why it has not done so. The registrant has adopted, as of the end of the period covered by this report, a code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer and controller. (b) For purposes of this Item, the term "code of ethics" means written standards that are reasonably designed to deter wrongdoing and to promote: (1) Honest and ethical conduct, including the ethical handling of actual or apparent conflicts of interest between personal and professional relationships; (2) Full, fair, accurate, timely, and understandable disclosure in reports and documents that a registrant files with, or submits to, the Commission and in other public communications made by the registrant; (3) Compliance with applicable governmental laws, rules, and regulations; (4) The prompt internal reporting of violations of the code to an appropriate person or persons identified in the code; and (5) Accountability for adherence to the code. (c) The registrant must briefly describe the nature of any amendment, during the period covered by the report, to a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item. The registrant must file a copy of any such amendment as an exhibit pursuant to Item 10(a), unless the registrant has elected to satisfy paragraph (f) of this Item by posting its code of ethics on its website pursuant to paragraph (f)(2) of this Item, or by undertaking to provide its code of ethics to any person without charge, upon request, pursuant to paragraph (f)(3) of this Item. The registrant has made no amendments to the code of ethics during the period covered by this report. (d) If the registrant has, during the period covered by the report, granted a waiver, including an implicit waiver, from a provision of the code of ethics to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, regardless of whether these individuals are employed by the registrant or a third party, that relates to one or more of the items set forth in paragraph (b) of this Item, the registrant must briefly describe the nature of the waiver, the name of the person to whom the waiver was granted, and the date of the waiver. Not applicable. (e) If the registrant intends to satisfy the disclosure requirement under paragraph (c) or (d) of this Item regarding an amendment to, or a waiver from, a provision of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the code of ethics definition enumerated in paragraph (b) of this Item by posting such information on its Internet website, disclose the registrant's Internet address and such intention. Not applicable. (f) The registrant must: (1) File with the Commission, pursuant to Item 10(a), a copy of its code of ethics that applies to the registrant's principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions, as an exhibit to its annual report on this Form N-CSR (see attachment); (2) Post the text of such code of ethics on its Internet website and disclose, in its most recent report on this Form N-CSR, its Internet address and the fact that it has posted such code of ethics on its Internet website; or (3) Undertake in its most recent report on this Form N-CSR to provide to any person without charge, upon request, a copy of such code of ethics and explain the manner in which such request may be made. 	See Item 10(2) ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. (a) (1) Disclose that the registrant's board of trustees has determined that the registrant either: (i) Has at least one audit committee financial expert serving on its audit committee; or (ii) Does not have an audit committee financial expert serving on its audit committee. The registrant's Board of Trustees has determined that the registrant has at least one audit committee financial expert. (2) If the registrant provides the disclosure required by paragraph (a)(1)(i) of this Item, it must disclose the name of the audit committee financial expert and whether that person is "independent." In order to be considered "independent" for purposes of this Item, a member of an audit committee may not, other than in his or her capacity as a member of the audit committee, the board of trustees, or any other board committee: (i) Accept directly or indirectly any consulting, advisory, or other compensatory fee from the issuer; or (ii) Be an "interested person" of the investment company as defined in Section 2(a)(19) of the Act (15 U.S.C. 80a-2(a)(19)). Ms. Marguerite A. Piret, an independent trustee, is such an audit committee financial expert. (3) If the registrant provides the disclosure required by paragraph (a)(1) (ii) of this Item, it must explain why it does not have an audit committee financial expert. Not applicable. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. (a) Disclose, under the caption AUDIT FEES, the aggregate fees billed for each of the last two fiscal years for professional services rendered by the principal accountant for the audit of the registrant's annual financial statements or services that are normally provided by the accountant in connection with statutory and regulatory filings or engagements for those fiscal years. N/A (b) Disclose, under the caption AUDIT-RELATED FEES, the aggregate fees billed in each of the last two fiscal years for assurance and related services by the principal accountant that are reasonably related to the performance of the audit of the registrant's financial statements and are not reported under paragraph (a) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (c) Disclose, under the caption TAX FEES, the aggregate fees billed in each of the last two fiscal years for professional services rendered by the principal accountant for tax compliance, tax advice, and tax planning. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (d) Disclose, under the caption ALL OTHER FEES, the aggregate fees billed in each of the last two fiscal years for products and services provided by the principal accountant, other than the services reported in paragraphs (a) through (c) of this Item. Registrants shall describe the nature of the services comprising the fees disclosed under this category. N/A (e) (1) Disclose the audit committee's pre-approval policies and procedures described in paragraph (c)(7) of Rule 2-01 of Regulation S-X. PIONEER FUNDS APPROVAL OF AUDIT, AUDIT-RELATED, TAX AND OTHER SERVICES PROVIDED BY THE INDEPENDENT AUDITOR SECTION I - POLICY PURPOSE AND APPLICABILITY The Pioneer Funds recognize the importance of maintaining the independence of their outside auditors. Maintaining independence is a shared responsibility involving Pioneer Investment Management, Inc ("PIM"), the audit committee and the independent auditors. The Funds recognize that a Fund's independent auditors: 1) possess knowledge of the Funds, 2) are able to incorporate certain services into the scope of the audit, thereby avoiding redundant work, cost and disruption of Fund personnel and processes, and 3) have expertise that has value to the Funds. As a result, there are situations where it is desirable to use the Fund's independent auditors for services in addition to the annual audit and where the potential for conflicts of interests are minimal. Consequently, this policy, which is intended to comply with Rule 210.2-01(C)(7), sets forth guidelines and procedures to be followed by the Funds when retaining the independent audit firm to perform audit, audit-related tax and other services under those circumstances, while also maintaining independence. Approval of a service in accordance with this policy for a Fund shall also constitute approval for any other Fund whose pre-approval is required pursuant to Rule 210.2-01(c)(7)(ii). In addition to the procedures set forth in this policy, any non-audit services that may be provided consistently with Rule 210.2-01 may be approved by the Audit Committee itself and any pre-approval that may be waived in accordance with Rule 210.2-01(c)(7)(i)(C) is hereby waived. Selection of a Fund's independent auditors and their compensation shall be determined by the Audit Committee and shall not be subject to this policy. SECTION II - POLICY ---------------- -------------------------------- ------------------------------------------------- SERVICE SERVICE CATEGORY DESCRIPTION SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES CATEGORY ---------------- -------------------------------- ------------------------------------------------- I. AUDIT Services that are directly o Accounting research assistance SERVICES related to performing the o SEC consultation, registration independent audit of the Funds statements, and reporting o Tax accrual related matters o Implementation of new accounting standards o Compliance letters (e.g. rating agency letters) o Regulatory reviews and assistance regarding financial matters o Semi-annual reviews (if requested) o Comfort letters for closed end offerings ---------------- -------------------------------- ------------------------------------------------- II. Services which are not o AICPA attest and agreed-upon procedures AUDIT-RELATED prohibited under Rule o Technology control assessments SERVICES 210.2-01(C)(4) (the "Rule") o Financial reporting control assessments and are related extensions of o Enterprise security architecture the audit services support the assessment audit, or use the knowledge/expertise gained from the audit procedures as a foundation to complete the project. In most cases, if the Audit-Related Services are not performed by the Audit firm, the scope of the Audit Services would likely increase. The Services are typically well-defined and governed by accounting professional standards (AICPA, SEC, etc.) ---------------- -------------------------------- ------------------------------------------------- ------------------------------------- ------------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the audit period for all services and related fees pre-approved specific service reported at each regularly subcategories. Approval of the scheduled Audit Committee independent auditors as meeting. auditors for a Fund shall constitute pre approval for these services. ------------------------------------- ------------------------------------ o "One-time" pre-approval o A summary of all such for the fund fiscal year within services and related fees a specified dollar limit (including comparison to for all pre-approved specified dollar limits) specific service subcategories reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limit for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for Audit-Related Services not denoted as "pre-approved", or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------------------ SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- III. TAX SERVICES Services which are not o Tax planning and support prohibited by the Rule, o Tax controversy assistance if an officer of the Fund o Tax compliance, tax returns, excise determines that using the tax returns and support Fund's auditor to provide o Tax opinions these services creates significant synergy in the form of efficiency, minimized disruption, or the ability to maintain a desired level of confidentiality. ----------------------- --------------------------- ----------------------------------------------- ------------------------------------- ------------------------- AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- ------------------------- ------------------------------------- ------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year all such services and within a specified dollar limit related fees 				 (including comparison 			 to specified dollar 			 limits) reported 			 quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for tax services not denoted as pre-approved, or to add a specific service subcategory as "pre-approved" ------------------------------------- ------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- --------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PRE-APPROVED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- --------------------------- ----------------------------------------------- IV. OTHER SERVICES Services which are not o Business Risk Management support prohibited by the Rule, o Other control and regulatory A. SYNERGISTIC, if an officer of the Fund compliance projects UNIQUE QUALIFICATIONS determines that using the Fund's auditor to provide these services creates significant synergy in the form of efficiency, minimized disruption, the ability to maintain a desired level of confidentiality, or where the Fund's auditors posses unique or superior qualifications to provide these services, resulting in superior value and results for the Fund. ----------------------- --------------------------- ----------------------------------------------- --------------------------------------- ------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------- -------------------------- o "One-time" pre-approval o A summary of for the fund fiscal year within all such services and a specified dollar limit related fees 			 (including comparison 			 to specified dollar 				 limits) reported quarterly. o Specific approval is needed to exceed the pre-approved dollar limits for these services (see general Audit Committee approval policy below for details on obtaining specific approvals) o Specific approval is needed to use the Fund's auditors for "Synergistic" or "Unique Qualifications" Other Services not denoted as pre-approved to the left, or to add a specific service subcategory as "pre-approved" ------------------------------------- -------------------------- SECTION III - POLICY DETAIL, CONTINUED ----------------------- ------------------------- ----------------------------------------------- SERVICE CATEGORY SERVICE CATEGORY SPECIFIC PROHIBITED SERVICE SUBCATEGORIES DESCRIPTION ----------------------- ------------------------- ----------------------------------------------- PROHIBITED SERVICES Services which result 1. Bookkeeping or other services in the auditors losing related to the accounting records or independence status financial statements of the audit under the Rule. client* 2. Financial information systems design and implementation* 3. Appraisal or valuation services, fairness* opinions, or contribution-in-kind reports 4. Actuarial services (i.e., setting actuarial reserves versus actuarial audit work)* 5. Internal audit outsourcing services* 6. Management functions or human resources 7. Broker or dealer, investment advisor, or investment banking services 8. Legal services and expert services unrelated to the audit 9. Any other service that the Public Company Accounting Oversight Board determines, by regulation, is impermissible ----------------------- ------------------------- ----------------------------------------------- ------------------------------------------- ------------------------------ AUDIT COMMITTEE APPROVAL POLICY AUDIT COMMITTEE REPORTING POLICY ------------------------------------------- ------------------------------ o These services are not to be o A summary of all performed with the exception of the(*) services and related services that may be permitted fees reported at each if they would not be subject to audit regularly scheduled procedures at the audit client (as Audit Committee meeting defined in rule 2-01(f)(4)) level will serve as continual the firm providing the service. confirmation that has 				 not provided any restricted services. ------------------------------------------- ------------------------------ -------------------------------------------------------------------------------- GENERAL AUDIT COMMITTEE APPROVAL POLICY: o For all projects, the officers of the Funds and the Fund's auditors will each make an assessment to determine that any proposed projects will not impair independence. o Potential services will be classified into the four non-restricted service categories and the "Approval of Audit, Audit-Related, Tax and Other Services" Policy above will be applied. Any services outside the specific pre-approved service subcategories set forth above must be specifically approved by the Audit Committee. o At least quarterly, the Audit Committee shall review a report summarizing the services by service category, including fees, provided by the Audit firm as set forth in the above policy. -------------------------------------------------------------------------------- (2) Disclose the percentage of services described in each of paragraphs (b) through (d) of this Item that were approved by the audit committee pursuant to paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X. N/A (f) If greater than 50 percent, disclose the percentage of hours expended on the principal accountant's engagement to audit the registrant's financial statements for the most recent fiscal year that were attributed to work performed by persons other than the principal accountant's full-time, permanent employees. N/A (g) Disclose the aggregate non-audit fees billed by the registrant's accountant for services rendered to the registrant, and rendered to the registrant's investment adviser (not including any sub-adviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the adviser that provides ongoing services to the registrant for each of the last two fiscal years of the registrant. N/A (h) Disclose whether the registrant's audit committee of the board of trustees has considered whether the provision of non-audit services that were rendered to the registrant's investment adviser (not including any subadviser whose role is primarily portfolio management and is subcontracted with or overseen by another investment adviser), and any entity controlling, controlled by, or under common control with the investment adviser that provides ongoing services to the registrant that were not pre-approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. The Fund's audit committee of the Board of Trustees has considered whether the provision of non-audit services that were rendered to the Affiliates (as defined) that were not pre- approved pursuant to paragraph (c)(7)(ii) of Rule 2-01 of Regulation S-X is compatible with maintaining the principal accountant's independence. Item 5. Audit Committee of Listed Registrants (a) If the registrant is a listed issuer as defined in Rule 10A-3 under the Exchange Act (17 CFR 240.10A-3), state whether or not the registrant has a separately-designated standing audit committee established in accordance with Section 3(a)(58)(A) of the Exchange Act (15 U.S.C. 78c(a)(58)(A)). If the registrant has such a committee, however designated, identify each committee member. If the entire board of directors is acting as the registrants audit committee as specified in Section 3(a)(58)(B) of the Exchange Act (15 U.S.C. 78c(a)(58)(B)), so state. N/A (b) If applicable, provide the disclosure required by Rule 10A-3(d) under the Exchange Act (17 CFR 240.10A-3(d)) regarding an exemption from the listing standards for audit committees. N/A Item 6. Schedule of Investments. File Schedule I Investments in securities of unaffiliated issuers as of the close of the reporting period as set forth in 210.12- 12 of Regulation S-X [17 CFR 210.12-12], unless the schedule is included as part of the report to shareholders filed under Item 1 of this Form. Included in Item 1 ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. A closed-end management investment company that is filing an annual report on this Form N-CSR must, unless it invests exclusively in non-voting securities, describe the policies and procedures that it uses to determine how to vote proxies relating to portfolio securities, including the procedures that the company uses when a vote presents a conflict between the interests of its shareholders, on the one hand, and those of the company's investment adviser; principal underwriter; or any affiliated person (as defined in Section 2(a)(3) of the Investment Company Act of 1940 (15 U.S.C. 80a-2(a)(3)) and the rules thereunder) of the company, its investment adviser, or its principal underwriter, on the other. Include any policies and procedures of the company's investment adviser, or any other third party, that the company uses, or that are used on the company's behalf, to determine how to vote proxies relating to portfolio securities. Not applicable to open-end management investment companies. Item 8. Portfolio Managers of Closed-End Management Investment Companies. (a) If the registrant is a closed-end management investment company that is filing an annual report on this Form N-CSR,provide the following information: (1) State the name, title, and length of service of the person or persons employed by or associated with the registrant or an investment adviser of the registrant who are primarily responsible for the day-to-day management of the registrants portfolio (Portfolio Manager). Also state each Portfolio Managers business experience during the past 5 years. Not applicable to open-end management investment companies. Item 9. Purchases of Equity Securities by Closed-End Management Investment Company and Affiliated Purchasers. (a) If the registrant is a closed-end management investment company, in the following tabular format, provide the information specified in paragraph (b) of this Item with respect to any purchase made by or on behalf of the registrant or any affiliated purchaser, as defined in Rule 10b-18(a)(3) under the Exchange Act (17 CFR 240.10b-18(a)(3)), of shares or other units of any class of the registrants equity securities that is registered by the registrant pursuant to Section 12 of the Exchange Act (15 U.S.C. 781). Instruction to paragraph (a). Disclose all purchases covered by this Item, including purchases that do not satisfy the conditions of the safe harbor of Rule 10b-18 under the Exchange Act (17 CFR 240.10b-18), made in the period covered by the report. Provide disclosures covering repurchases made on a monthly basis. For example, if the reporting period began on January 16 and ended on July 15, the chart would show repurchases for the months from January 16 through February 15, February 16 through March 15, March 16 through April 15, April 16 through May 15, May 16 through June 15, and June 16 through July 15. Not applicable to open-end management investment companies. Item 10. Submission of Matters to a Vote of Security Holders. Describe any material changes to the procedures by which shareholders may recommend nominees to the registrants board of directors, where those changes were implemented after the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14A (17 CFR 240.14a-101), or this Item. There have been no material changes to the procedures by which the shareholders may recommend nominees to the registrants board of directors since the registrant last provided disclosure in response to the requirements of Item 7(d)(2)(ii)(G) of Schedule 14(A) in its definitive proxy statement, or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Disclose the conclusions of the registrant's principal executive officer or officers and principal financial officer or officers, or persons performing similar functions, about the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-2(c) under the Act (17 CFR 270.30a-2(c))) based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of the report that includes the disclosure required by this paragraph. The registrant's principal executive officer and principal financial officer have concluded that the registrant's disclosure controls and procedures are effective based on their evaluation of these controls and procedures as of a date within 90 days of the filing date of this report. (b) Disclose whether or not there were significant changes in the registrant's internal controls or in other factors that could significantly affect these controls subsequent to the date of their evaluation, including any corrective actions with regard to significant deficiencies and material weaknesses. There were no significant changes in the registrant's internal control over financial reporting that occurred during the second fiscal quarter of the period covered by this report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. The registrant's principal executive officer and principal financial officer, however, voluntarily are reporting the following information: In August of 2006 the registrant's investment adviser enhanced its internal procedures for reporting performance information required to be included in prospectuses. Those enhancements involved additional internal controls over the appropriateness of performance data generated for this purpose. Such enhancements were made following an internal review which identified prospectuses relating to certain classes of shares of a limited number of registrants where, inadvertently, performance information not reflecting the deduction of applicable sales charges was included. Those prospectuses were revised, and the revised prospectuses were distributed to shareholders. ITEM 12. EXHIBITS. File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (a) Any code of ethics, or amendment thereto, that is the subject of the disclosure required by Item 2, to the extent that the registrant intends to satisfy the Item 2 requirements through filing of an exhibit. (b) A separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2 under the Act (17 CFR 270.30a-2). Filed herewith. SIGNATURES [See General Instruction F] Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized. (Registrant) Pioneer Ibbotson Asset Allocation Series By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr, President Date April 1, 2013 Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated. By (Signature and Title)* /s/ John F. Cogan, Jr. John F. Cogan, Jr., President Date April 1, 2013 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer & Chief Accounting & Financial Officer Date April 1, 2013 * Print the name and title of each signing officer under his or her signature.