OMB APPROVAL OMB Number: 3235-0570 Expires: August 31, 2010 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, 2009 through July 31, 2010 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 - -------------------------------------------------------------------------------- Annual Report | July 31, 2010 - -------------------------------------------------------------------------------- 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: pioneerinvestments.com Table of Contents Letter to Shareowners 2 Portfolio Management Discussion 4 Fund Reviews 7 Comparing Ongoing Fund Expenses 9 Prices and Distributions 17 Portfolio Summary & Performance Update 19 Schedule of Investments 39 Financial Statements 47 Notes to Financial Statements 69 Report of Independent Registered Public Accounting Firm 76 Trustees, Officers and Service Providers 77 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 1 President's Letter Dear Shareowner, Stock and bond markets around the globe have begun to recover over the past year from one of their most tumultuous periods in history. This is a welcome relief, and we are generally optimistic about the prospects for the economy going forward. Still, challenges remain. Unemployment is high; consumer demand and loan growth are weak; and housing has not returned to normal. At Pioneer, we have long advocated the benefits of investing for the long term. This strategy has generally performed well for many investors. Those who remained invested in the market during the downturn have most likely seen their portfolios start to recover over the past year, as the Dow Jones Industrial Average climbed back from the depressed levels we saw in early 2009. Many bond investors have similarly seen a strong rebound, with a broad-based recovery occurring across many different fixed-income asset classes. The riskiest asset classes, such as high-yield bonds, outperformed other fixed-income asset classes during most of 2009. At Pioneer, we are not changing the approach to investing that we have used for more than 80 years. We remain focused on company fundamentals and risk management. Our investment process is based on careful research into individual companies, quantitative analysis, and active portfolio management. This three-pillared process, which we apply to each of our portfolios, is supported by an integrated team approach and is designed to carefully balance risk and reward. While we see potential opportunities for making money in many corners of the markets around the globe, it takes research and experience to separate solid investment opportunities from speculation. Following this difficult period, many investors are rethinking their approach to investing and risk management. Some are questioning whether the basic investment principles they were taught in the past are still useful in today's markets. Complicating matters is that financial markets remain unpredictable. 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. There is no single best strategy that works for every investor. 2 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 We invite you to learn more about Pioneer and our time-tested approach to investing by consulting with your financial advisor or visiting us online at www.pioneerinvestments.com. We greatly appreciate your trust in us and we thank you for investing with Pioneer. Respectfully, /s/ Daniel K. Kingsbury Daniel K. Kingsbury President and CEO Pioneer Investment Management USA, Inc. Any information in this shareholder report regarding market or economic trends or the factors influencing the Fund's historical or future performance are statements of the opinion of Fund management 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 | Annual Report | 7/31/10 3 Portfolio Management Discussion | 7/31/10 In the following interview, portfolio manager Dr. Peng Chen, CFA, President, Ibbotson Associates Advisors, LLC, discusses the market environment and investment strategies and how they affected the funds in the Pioneer Ibbotson Asset Allocation Series for the 12 months ended July 31, 2010. Q Could you characterize the economic and market backdrop during the 12 months ended July 31, 2010? A As we entered August of 2009, the rally in riskier assets that had begun earlier in the year remained in place. Investor sentiment was supported by the unprecedented efforts of global governments to end the financial crisis and the conviction that the worst-case economic scenarios had been averted. In addition to a more stable financial backdrop, we attributed a large portion of the gains to the market's favorable response to "less bad" news, rather than a return to pre-crisis economic conditions. The trend toward improving economic data continued through the first quarter of 2010. By the end of the quarter, on March 31, 2010, there was speculation that the National Bureau of Economic Research was only a good data point away from declaring the end of the recession that had begun in December of 2007. In keeping with that backdrop, the U.S. government took its first steps towards the withdrawal of the massive economic stimulus employed throughout 2009. A series of negative data readings over the second quarter of 2010, however, changed market sentiment rather dramatically, with many economists declaring that the various stimulus programs had failed to jumpstart the private sector. Concerns over the health of the global economic recovery and continued sovereign debt issues in the so-called P.I.I.G.S nations (Portugal, Italy, Ireland, Greece, and Spain) triggered a sharp rise in investor risk aversion and a flight into Treasuries. The result was a plunge in global equities over the second quarter of 2010 and a rally in U.S. Treasuries that drove 10-year Treasury yields below 3%. July of 2010 saw the funds' fiscal year close (on July 31, 2010) with a significant rebound in equities. That was somewhat surprising in view of the Federal Reserve Board's (the Fed's) negative revisions for 2010 economic growth and unemployment, a disappointing gross domestic product (GDP) growth figure for the second quarter of 2010 and further downgrades of European sovereign debt. Markets were encouraged by the results of European bank "stress tests" and a strong start to the earnings reporting season for the second quarter. 4 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 For the full 12 months ended July 31, 2010, the U.S. equity market was up 13.84%, as measured by the Standard & Poor's 500 Index (the S&P 500). Within the U.S. market, while all styles and market capitalizations provided strong positive returns, small-cap stocks outperformed large-cap and value outperformed growth for the year. The Barclays Capital Aggregate Bond Index, the most popular measure of the performance of the U.S. bond market, returned 8.91% for the 12 months ended July 31, 2010. Q What were the strategic considerations that you applied to the four Pioneer funds in allocating assets over the 12 months ended July 31, 2010, and how did they affect the funds' performance? A For each fund, assets were invested in keeping with their broad asset allocation and specific mutual fund targets. We entered the 12-month period with a neutral breakdown between equity and fixed-income assets in each of the portfolios. Toward the end of March 2010, we implemented an overweighting of bonds and a corresponding underweighting of equities in each of the funds, as we believed equity valuations had become stretched relative to the prevailing economic headwinds. That strategy added to the relative performance of the funds when equities plunged in the second quarter and high-quality bonds provided positive returns. In addition to adjusting the proportion of stock to bond holdings in the funds, we also make tactical shifts within the equity portions of the funds from time to time. In that vein, we maintained neutral target weightings in the non-U.S. equity market investment alternatives, both developed and emerging. Within the U.S. portion of the stock portfolios, however, for much of the 12-month period we maintained an overweighting of U.S. large-cap stocks and a corresponding underweighting of U.S. small-cap stocks. We believed large-cap stocks had the potential to be more resilient in the face of short-term market volatility given their globally diversified businesses and more stable cash flows, earnings, and financing sources. However, the tilt constrained the relative performance of the funds, as large-cap companies were caught in the global downdraft of the second quarter and small-cap stocks outperformed. Q What factors are you watching most closely as you determine strategy for the funds going forward? A Given the growing fear of a "double-dip" recession, or at least the prospect of a very slow recovery, inflation expectations have shifted down. We believe the growing global push on the part of governments for fiscal austerity is more likely to result in deflation, rather than inflation. In the U.S., the prospect is for cuts in government spending and increases in taxes. In addition, the anemic state of the job market should keep both wage growth and inflation low in the short term. Given the Fed's dual mandate of maintaining Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 5 employment and anchoring inflation, we expect that it will be a considerable period before Chairman Bernanke feels compelled to raise interest rates. We therefore expect very low interest rates from the Fed for at least another year. The decline in most equity markets during the second quarter has helped partially to mitigate our concerns over equity overvaluations. Given the extremely low yields currently available from bonds, we believe it is unlikely that bonds will outperform stocks over the next several years. As a result, we will be evaluating opportunities to increase the stock weightings in the funds. We will continue to monitor closely the economic backdrop as we manage the funds within their strategic asset allocation guidelines. Please refer to the Schedule of Investments on pages 39-46 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 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. 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 the opinion of the fund's management 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. 6 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Fund Reviews | 7/31/10 Pioneer Ibbotson Conservative Allocation Fund The Fund's Class A shares had a total return of 11.88% at net asset value for the 12 months ended July 31, 2010, while the Fund's benchmarks, the S&P 500 and the Barclays Capital Aggregate Bond Index, returned 13.84% and 8.91%, respectively. Over the same period, the average return of the 454 mutual funds in Lipper's Mixed-Asset Target Allocation/Conservative Funds category was 11.54%. The Fund targeted an asset allocation of 30% equities and 70% fixed income during the period. Within the equity portion of the Fund, Pioneer Fund was the largest holding, at 5.32% of assets on July 31, 2010. Pioneer Global Equity Fund was the next largest equity holding, at 4.14% of assets. Within the fixed- income portion of the Fund, the largest holding at the end of the period was in Pioneer Bond Fund, at 25.06% of assets, followed by a shorter-term fund, Pioneer Short Term Income Fund, at 24.95%. Pioneer Ibbotson Moderate Allocation Fund The Fund's Class A shares had a total return of 13.26% at net asset value for the 12 months ended July 31, 2010, while the Fund's benchmarks, the S&P 500 and the Barclays Capital Aggregate Bond Index, returned 13.84% and 8.91%, respectively. Over the same period, the average return of the 502 mutual funds in Lipper's Mixed-Asset Target Allocation/Moderate Funds category was 11.87%. The Fund targeted an asset allocation of 60% equities, 40% fixed income during the period. Within the equity portion of the Fund, Pioneer Fund was the largest holding, at 8.33% of assets on July 31, 2010. Pioneer International Value Fund was the next largest equity holding, at 7.16% of assets. Within the fixed-income portion of the Fund, the largest holding at the end of the period was in Pioneer Bond Fund, at 17.20% of assets, followed by a shorter-term fund, Pioneer Short Term Income Fund, at 14.24%. Pioneer Ibbotson Growth Allocation Fund The Fund's Class A shares had a total return of 13.90% at net asset value for the 12 months ended July 31, 2010, while the Fund's benchmarks, the S&P 500 and the Barclays Capital Aggregate Bond Index, returned 13.84% and 8.91%, respectively. Over the same period, the average return of the 578 mutual funds in Lipper's Mixed-Asset Target Allocation/Growth Fund category was 12.01%. The Fund targeted an asset allocation of 75% equities, 25% fixed income during the period. Within the equity portion of the Fund, Pioneer International Value Fund was the largest holding, at 8.31% of assets on July 31, 2010. Pioneer Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 7 Fund Reviews | 7/31/10 (continued) Fund was the next largest equity holding, at 8.02% of assets. Within the fixed- income portion of the Fund, the largest holding at the end of the period was in Pioneer Bond Fund, at 14.00% of assets, followed by a shorter-term fund, Pioneer Short Term Income Fund, at 7.05%. Pioneer Ibbotson Aggressive Allocation Fund The Fund's Class A shares had a total return of 14.16% at net asset value over the 12 months ended July 31, 2010, while the Fund's benchmarks, the S&P 500 and the Barclays Capital Aggregate Bond Index, returned 13.84% and 8.91%, respectively. Over the same period, the average return of the 863 mutual funds in Lipper's Multi-Cap Core Funds category was 13.92%. The Fund targeted an asset allocation of 90% equities, 10% fixed income during the period. Within the equity portion of the Fund, Pioneer International Value Fund was the largest holding, at 12.07% of assets on July 31, 2010. On the domestic side, Pioneer Mid Cap Value Fund, at 8.86% of assets and Pioneer Fund, at 8.21% of assets, were the largest holdings. The bulk of the fixed-income portion of the Fund was invested in an intermediate-term bond fund, Pioneer Bond Fund, at 9.77% of assets. Call 1-800-225-6292 or visit www.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 the opinion of the fund's management 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. 8 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,036.60 $1,033.10 $1,034.22 $1,039.29 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 7.32 $ 11.85 $ 11.40 $ 6.57 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.45%, 2.35%, 2.26% and 1.30% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 9 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,017.60 $1,013.14 $1,013.59 $1,018.35 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 7.25 $ 11.73 $ 11.28 $ 6.51 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.45%, 2.35%, 2.26% and 1.30% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 10 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,041.95 $1,038.15 $1,038.81 $1,044.73 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 7.65 $ 11.62 $ 11.22 $ 5.63 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%, 2.30%, 2.22% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 11 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/2010 - ------------------------------------------------------------------------------------------ Ending Account Value $1,017.31 $1,013.39 $1,013.79 $1,019.29 (after expenses) on 7/31/2010 - ------------------------------------------------------------------------------------------ Expenses Paid $ 7.55 $ 11.48 $ 11.08 $ 5.56 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%, 2.30%, 2.22% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 12 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,046.11 $1,043.48 $1,042.79 $1,047.94 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 8.27 $ 12.21 $ 11.90 $ 4.32 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.63%, 2.41%, 2.35% and 0.85% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,016.71 $1,012.84 $1,013.14 $1,020.58 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 8.15 $ 12.03 $ 11.73 $ 4.26 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.63%, 2.41%, 2.35% and 0.85% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 14 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,049.36 $1,044.27 $1,046.09 $1,051.04 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 8.84 $ 12.82 $ 12.53 $ 6.66 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.74%, 2.53%, 2.47% and 1.31% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 15 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 February 1, 2010 through July 31, 2010. - ------------------------------------------------------------------------------------------ Share Class A B C Y - ------------------------------------------------------------------------------------------ Beginning Account $1,000.00 $1,000.00 $1,000.00 $1,000.00 Value on 2/1/10 - ------------------------------------------------------------------------------------------ Ending Account Value $1,016.17 $1,012.25 $1,012.55 $1,018.30 (after expenses) on 7/31/10 - ------------------------------------------------------------------------------------------ Expenses Paid $ 8.70 $ 12.62 $ 12.33 $ 6.56 During Period* - ------------------------------------------------------------------------------------------ * Expenses are equal to the Fund's annualized expense ratio plus the expense ratios of the underlying funds. These combined totals were 1.74%, 2.53%, 2.47% and 1.31% 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 181/365 (to reflect the one-half year period) to calculate the "Expenses Paid During Period" in the table above. 16 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Prices and Distributions | 7/31/10 Net Asset Value per Share - -------------------------------------------------------------------------------- Conservative Allocation Fund - -------------------------------------------------------------------------------- Class 7/31/10 7/31/09 - -------------------------------------------------------------------------------- A $10.19 $9.40 - -------------------------------------------------------------------------------- B $ 9.99 $9.24 - -------------------------------------------------------------------------------- C $ 9.96 $9.21 - -------------------------------------------------------------------------------- Y $ 9.79 $9.02 - -------------------------------------------------------------------------------- Moderate Allocation Fund - -------------------------------------------------------------------------------- Class 7/31/10 7/31/09 - -------------------------------------------------------------------------------- A $9.68 $8.79 - -------------------------------------------------------------------------------- B $9.25 $8.41 - -------------------------------------------------------------------------------- C $9.10 $8.29 - -------------------------------------------------------------------------------- Y $9.80 $8.89 - -------------------------------------------------------------------------------- Growth Allocation Fund - -------------------------------------------------------------------------------- Class 7/31/10 7/31/09 - -------------------------------------------------------------------------------- A $ 9.77 $8.74 - -------------------------------------------------------------------------------- B $ 8.64 $7.75 - -------------------------------------------------------------------------------- C $ 9.26 $8.30 - -------------------------------------------------------------------------------- Y $10.07 $9.00 - -------------------------------------------------------------------------------- Aggressive Allocation Fund - -------------------------------------------------------------------------------- Class 7/31/10 7/31/09 - -------------------------------------------------------------------------------- A $9.56 $8.45 - -------------------------------------------------------------------------------- B $8.96 $7.93 - -------------------------------------------------------------------------------- C $9.08 $8.04 - -------------------------------------------------------------------------------- Y $9.67 $8.55 - -------------------------------------------------------------------------------- Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 17 Distributions per Share: 8/1/09-7/31/10 - -------------------------------------------------------------------------------- Conservative Allocation Fund - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $0.3168 $-- $-- - -------------------------------------------------------------------------------- B $0.2413 $-- $-- - -------------------------------------------------------------------------------- C $0.2483 $-- $-- - -------------------------------------------------------------------------------- Y $0.2926 $-- $-- - -------------------------------------------------------------------------------- Moderate Allocation Fund - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $0.2712 $-- $-- - -------------------------------------------------------------------------------- B $0.1999 $-- $-- - -------------------------------------------------------------------------------- C $0.2180 $-- $-- - -------------------------------------------------------------------------------- Y $0.3067 $-- $-- - -------------------------------------------------------------------------------- Growth Allocation Fund - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $0.1829 $-- $-- - -------------------------------------------------------------------------------- B $0.1190 $-- $-- - -------------------------------------------------------------------------------- C $0.1247 $-- $-- - -------------------------------------------------------------------------------- Y $0.2169 $-- $-- - -------------------------------------------------------------------------------- Aggressive Allocation Fund - -------------------------------------------------------------------------------- Net Investment Short-Term Long-Term Class Income Capital Gains Capital Gains - -------------------------------------------------------------------------------- A $0.0865 $-- $-- - -------------------------------------------------------------------------------- B $0.0185 $-- $-- - -------------------------------------------------------------------------------- C $0.0256 $-- $-- - -------------------------------------------------------------------------------- Y $0.1190 $-- $-- - -------------------------------------------------------------------------------- 18 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Portfolio Summary | 7/31/10 Pioneer Ibbotson Conservative Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A PIE CHART IN THE PRINTED MATERIAL.] Fixed Income 70% Equity 30% Short Term Bonds 27.00% - ------------------------------------------------ Domestic Corporate Bonds 17.00 - ------------------------------------------------ Cash & Cash Equivalent 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 International Stocks - --------------------------------------------------------------------------------------------- Pioneer Fund 5.32% Pioneer Global Equity Fund 4.14% - --------------------------------------------------------------------------------------------- Pioneer Disciplined Value Fund 3.21 Pioneer International Value Fund 3.47 - --------------------------------------------------------------------------------------------- Pioneer Research Fund 3.19 Pioneer Emerging Markets Fund 1.08 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund 2.13 Bonds - --------------------------------------------------------------------------------------------- Pioneer Cullen Value Fund 2.12 Pioneer Bond Fund 25.06% - --------------------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund 2.10 Pioneer Short Term Income Fund 24.95 - --------------------------------------------------------------------------------------------- Pioneer Real Estate Shares Fund 1.10 Pioneer Strategic Income Fund 7.34 - --------------------------------------------------------------------------------------------- Pioneer Equity Income Fund 1.06 Pioneer Global High Yield Fund 6.33 - --------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund 1.06 Pioneer High Yield Fund 3.18 - --------------------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund 1.06 Pioneer Floating Rate Fund 1.04 - --------------------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund 1.06 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth Fund 0.00 - --------------------------------------------------------------------------------------------- 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 | Annual Report | 7/31/10 19 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------------------- Life-of-Class (5/12/05) 3.59% 2.42% 5 Years 3.16 1.94 1 Year 11.88 5.38 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.84% 1.53% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Conservative Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 5/05 9,425 10,000 10,000 7/05 9,599 9,963 10,387 7/06 9,919 10,108 10,945 7/07 10,800 10,672 12,710 7/08 10,490 11,329 11,300 7/09 10,024 12,217 9,046 7/10 11,215 13,306 10,298 Call 1-800-225-6292 or visit www.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 12/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an Index. 20 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (5/12/05) 2.68% 2.68% 5 Years 2.23 2.23 1 Year 10.80 6.80 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.65% 2.43% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Conservative Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 5/05 10,000 10,000 10,000 7/05 10,178 9,963 10,387 7/06 10,409 10,108 10,945 7/07 11,250 10,672 12,710 7/08 10,832 11,329 11,300 7/09 10,257 12,217 9,046 7/10 11,364 13,306 10,298 Call 1-800-225-6292 or visit www.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). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. 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 1/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an Index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 21 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (5/12/05) 2.65% 2.65% 5 Years 2.24 2.24 1 Year 10.91 10.91 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.55% 2.43% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Conservative Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 5/05 10,000 10,000 10,000 7/05 10,168 9,963 10,387 7/06 10,419 10,108 10,945 7/07 11,253 10,672 12,710 7/08 10,844 11,329 11,300 7/09 10,244 12,217 9,046 7/10 11,362 13,306 10,298 Call 1-800-225-6292 or visit www.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 net expense ratio reflects contractual expense limitations currently in effect through 1/1/11 for Class C 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 22 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (5/12/05)* 2.18% 2.18% 5 Years 1.69 1.69 1 Year 11.89 11.89 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 8.01% 8.01% - -------------------------------------------------------------------------------- * Inception date of Class A Shares. [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $5,000,000 Investment Pioneer Ibbotson Barclays Capital Conservative Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 5/05 5,000,000 5,000,000 5,000,000 7/05 5,094,059 4,981,499 5,19,3293 7/06 5,268,849 5,054,204 5,472,488 7/07 5,738,328 5,336,140 6,354,929 7/08 5,541,848 5,664,329 5,650,115 7/09 4,950,847 6,108,716 4,522,973 7/10 5,539,507 6,652,993 5,149,147 Call 1-800-225-6292 or visit www.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 10/5/05 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 23 Portfolio Summary | 7/31/10 Pioneer Ibbotson Moderate Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY 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 Equivalent 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 International Stocks - --------------------------------------------------------------------------------------------- Pioneer Fund 8.33% Pioneer International Value Fund 7.16% - --------------------------------------------------------------------------------------------- Pioneer Real Estate Shares Fund 4.37 Pioneer Global Equity Fund 6.68 - --------------------------------------------------------------------------------------------- Pioneer Cullen Value Fund 4.14 Pioneer Emerging Markets Fund 3.98 - --------------------------------------------------------------------------------------------- Pioneer Research Fund 4.10 Bonds - --------------------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund 4.02 Pioneer Bond Fund 17.20% - --------------------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund 3.69 Pioneer Short Term Income Fund 14.24 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Value Fund 3.63 Pioneer Global High Yield Fund 5.16 - --------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund 3.25 Pioneer Strategic Income Fund 2.07 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund 3.10 Pioneer High Yield Fund 1.10 - --------------------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund 2.05 - --------------------------------------------------------------------------------------------- Pioneer Equity Income Fund 1.04 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund 0.66 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth Fund 0.02 - --------------------------------------------------------------------------------------------- Pioneer Independence Fund 0.01 - --------------------------------------------------------------------------------------------- Pioneer Value Fund 0.00 - --------------------------------------------------------------------------------------------- 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. 24 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 3.92% 2.89% 5 Years 1.92 0.72 1 Year 13.26 6.70 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.58% 1.56% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Moderate Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 9,425 10,000 10,000 7/05 10,570 10,283 11,359 7/06 11,097 10,433 11,970 7/07 12,493 11,015 13,900 7/08 11,560 11,692 12,358 7/09 10,266 12,610 9,893 7/10 11,627 13,733 11,262 Call 1-800-225-6292 or visit www.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 12/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 25 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 2.55% 2.55% 5 Years 1.09 1.09 1 Year 12.39 8.39 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.45% 2.34% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Moderate Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 10,978 10,283 11,359 7/06 11,417 10,433 11,970 7/07 12,753 11,015 13,900 7/08 11,691 11,692 12,358 7/09 10,311 12,610 9,893 7/10 11,588 13,733 11,262 Call 1-800-225-6292 or visit www.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). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. 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 1/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 26 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 2.48% 2.48% 5 Years 1.15 1.15 1 Year 12.43 12.43 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.34% 2.34% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Moderate Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 11,122 10,283 11,359 7/06 11,573 10,433 11,970 7/07 12,941 11,015 13,900 7/08 11,882 11,692 12,358 7/09 10,474 12,610 9,893 7/10 11,776 13,733 11,262 Call 1-800-225-6292 or visit www.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 net expense ratio reflects contractual expense limitations currently in effect through 1/1/11 for Class C 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 27 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04)* 4.42% 4.42% 5 Years 2.51 2.51 1 Year 13.75 13.75 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.15% 1.15% - -------------------------------------------------------------------------------- * Inception date of Class A shares. [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $5,000,000 Investment Pioneer Ibbotson Barclays Capital Moderate Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 5,000,000 5,000,000 5,000,000 7/05 5,606,494 5,141,454 5,679,459 7/06 5,913,111 5,216,493 5,984,789 7/07 6,680,624 5,507,482 6,949,838 7/08 6,206,468 5,846,209 6,179,044 7/09 5,580,029 6,304,865 4,946,386 7/10 6,347,323 6,866,618 5,631,178 Call 1-800-225-6292 or visit www.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 9/23/05 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 28 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Portfolio Summary | 7/31/10 Pioneer Ibbotson Growth Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY 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 International Stocks - --------------------------------------------------------------------------------------------- Pioneer Fund 8.02% Pioneer International Value Fund 8.31% - --------------------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund 6.23 Pioneer Global Equity Fund 7.94 - --------------------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund 5.97 Pioneer Emerging Markets Fund 5.87 - --------------------------------------------------------------------------------------------- Pioneer Real Estate Shares Fund 5.54 Bonds - --------------------------------------------------------------------------------------------- Pioneer Cullen Value Fund 4.99 Pioneer Bond Fund 14.00% - --------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund 4.35 Pioneer Short Term Income Fund 7.05 - --------------------------------------------------------------------------------------------- Pioneer Research Fund 4.06 Pioneer Global High Yield Fund 2.87 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund 3.58 Pioneer Strategic Income Fund 1.81 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Value Fund 3.19 Pioneer High Yield Fund 0.44 - --------------------------------------------------------------------------------------------- Pioneer Equity Income Fund 3.02 - --------------------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund 2.01 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund 0.47 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth Fund 0.12 - --------------------------------------------------------------------------------------------- Pioneer Value Fund 0.09 - --------------------------------------------------------------------------------------------- Pioneer Independence Fund 0.07 - --------------------------------------------------------------------------------------------- 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 | Annual Report | 7/31/10 29 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 3.77% 2.75% 5 Years 1.13 -0.06 1 Year 13.90 7.27 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.76% 1.66% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Growth Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 9,425 10,000 10,000 7/05 10,892 10,283 11,359 7/06 11,577 10,433 11,970 7/07 13,281 11,015 13,900 7/08 11,969 11,692 12,358 7/09 10,115 12,610 9,893 7/10 11,520 13,733 11,262 Call 1-800-225-6292 or visit www.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 12/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 30 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 1.52% 1.52% 5 Years 0.34 0.34 1 Year 13.03 9.03 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.64% 2.44% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Growth Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 11,046 10,283 11,359 7/06 11,657 10,433 11,970 7/07 13,250 11,015 13,900 7/08 11,838 11,692 12,358 7/09 9,938 12,610 9,893 7/10 11,233 13,733 11,262 Call 1-800-225-6292 or visit www.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). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. 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 1/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 31 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 2.51% 2.51% 5 Years 0.40 0.40 1 Year 13.08 13.08 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.47% 2.44% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Growth Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 11,310 10,283 11,359 7/06 11,933 10,433 11,970 7/07 13,575 11,015 13,900 7/08 12,158 11,692 12,358 7/09 10,203 12,610 9,893 7/10 11,537 13,733 11,262 Call 1-800-225-6292 or visit www.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 net expense ratio reflects contractual expense limitations currently in effect through 1/1/11 for Class C 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 32 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04)* 4.54% 4.54% 5 Years 2.02 2.02 1 Year 14.33 14.33 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.26% 1.26% - -------------------------------------------------------------------------------- * Inception date of Class A shares. [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $5,000,000 Investment Pioneer Ibbotson Barclays Capital Growth Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 5,000,000 5,000,000 5,000,000 7/05 5,776,725 5,141,454 5,679,459 7/06 6,193,377 5,216,493 5,984,789 7/07 7,114,596 5,507,482 6,949,838 7/08 6,470,796 5,846,209 6,179,044 7/09 5,585,334 6,304,865 4,946,386 7/10 6,385,461 6,866,618 5,631,178 Call 1-800-225-6292 or visit www.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 9/26/05 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 33 Portfolio Summary | 7/31/10 Pioneer Ibbotson Aggressive Allocation Fund Target Asset Allocations - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY 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 International Stocks - --------------------------------------------------------------------------------------------- Pioneer Mid Cap Value Fund 8.86% Pioneer International Value Fund 12.07% - --------------------------------------------------------------------------------------------- Pioneer Fund 8.21 Pioneer Global Equity Fund 10.16 - --------------------------------------------------------------------------------------------- Pioneer Real Estate Shares Fund 7.51 Pioneer Emerging Markets Fund 7.07 - --------------------------------------------------------------------------------------------- Pioneer Growth Opportunities Fund 6.20 Bonds - --------------------------------------------------------------------------------------------- Pioneer Fundamental Growth Fund 5.89 Pioneer Bond Fund 9.77% - --------------------------------------------------------------------------------------------- Pioneer Cullen Value Fund 5.08 Pioneer Strategic Income Fund 1.82 - --------------------------------------------------------------------------------------------- Pioneer Research Fund 4.03 Pioneer High Yield Fund 0.02 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Growth Fund 3.70 - --------------------------------------------------------------------------------------------- Pioneer Disciplined Value Fund 3.03 - --------------------------------------------------------------------------------------------- Pioneer Select Mid Cap Growth Fund 3.01 - --------------------------------------------------------------------------------------------- Pioneer Equity Income Fund 3.01 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Small Cap Growth Fund 0.48 - --------------------------------------------------------------------------------------------- Pioneer Oak Ridge Large Cap Growth Fund 0.04 - --------------------------------------------------------------------------------------------- Pioneer Value Fund 0.02 - --------------------------------------------------------------------------------------------- Pioneer Independence Fund 0.02 - --------------------------------------------------------------------------------------------- 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. 34 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- Public Net Asset Offering Period Value (NAV) Price (POP) - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 3.59% 2.56% 5 Years 0.31 -0.87 1 Year 14.16 7.54 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.93% 1.77% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Aggressive Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 9,425 10,000 10,000 7/05 11,173 10,283 11,359 7/06 11,989 10,433 11,970 7/07 13,956 11,015 13,900 7/08 12,276 11,692 12,358 7/09 9,938 12,610 9,893 7/10 11,345 13,733 11,262 Call 1-800-225-6292 or visit www.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 12/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 35 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 2.23% 2.23% 5 Years -0.51 -0.51 1 Year 13.22 9.22 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.81% 2.56% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Aggressive Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 11,690 10,283 11,359 7/06 12,434 10,433 11,970 7/07 14,361 11,015 13,900 7/08 12,534 11,692 12,358 7/09 10,066 12,610 9,893 7/10 11,397 13,733 11,262 Call 1-800-225-6292 or visit www.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). Effective December 1, 2004, the period during which a CDSC is applied to withdrawals was shortened to 5 years. The maximum CDSC for Class B shares continues to be 4%. For more complete information, please see the prospectus. Note: Shares purchased prior to December 1, 2004 remain subject to the CDSC in effect at the time you purchased those shares. For performance information for shares purchased prior to December 1, 2004, please visit www.pioneerinvestments.com. 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 1/1/11 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 36 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04) 2.49% 2.49% 5 Years -0.46 -0.46 1 Year 13.25 13.25 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 2.62% 2.56% - -------------------------------------------------------------------------------- [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $10,000 Investment Pioneer Ibbotson Barclays Capital Aggressive Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 10,000 10,000 10,000 7/05 11,563 10,283 11,359 7/06 12,299 10,433 11,970 7/07 14,221 11,015 13,900 7/08 12,429 11,692 12,358 7/09 9,979 12,610 9,893 7/10 11,302 13,733 11,262 Call 1-800-225-6292 or visit www.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 net expense ratio reflects contractual expense limitations currently in effect through 1/1/11 for Class C 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 37 Performance Update | 7/31/10 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 Stock Index and Barclays Capital Aggregate Bond Index. Average Annual Total Returns (As of July 31, 2010) - -------------------------------------------------------------------------------- If If Period Held Redeemed - -------------------------------------------------------------------------------- Life-of-Class (8/9/04)* 3.96% 3.96% 5 Years 0.74 0.74 1 Year 14.49 14.49 - -------------------------------------------------------------------------------- Expense Ratio (Per prospectus dated December 1, 2009) - -------------------------------------------------------------------------------- Gross Net - -------------------------------------------------------------------------------- 1.35% 1.35% - -------------------------------------------------------------------------------- * Inception date of Class A shares. [THE FOLLOWING DATA IS REPRESENTED BY A MOUNTAIN CHART IN THE PRINTED MATERIAL.] Value of $5,000,000 Investment Pioneer Ibbotson Barclays Capital Aggressive Aggregate Standard & Poor's Allocation Fund Bond Index 500 Index 8/04 5,000,000 5,000,000 5,000,000 7/05 5,929,998 5,141,454 5,679,459 7/06 6,379,347 5,216,493 5,984,789 7/07 7,470,251 5,507,482 6,949,838 7/08 6,661,413 5,846,209 6,179,044 7/09 5,372,710 6,304,865 4,946,386 7/10 6,151,437 6,866,618 5,631,178 Call 1-800-225-6292 or visit www.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 9/23/05 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. The Standard & Poor's 500 Stock Index (the S&P 500) is a commonly used measure of the broad U.S. stock market. The Barclays Capital 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. You cannot invest directly in an index. 38 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Schedule of Investments | 7/31/10 Pioneer Ibbotson Conservative Allocation Fund - ------------------------------------------------------------------------------ Shares Value - ------------------------------------------------------------------------------ MUTUAL FUNDS -- 93.7% PIONEER FUNDS* -- 93.7% 1,401,062 Pioneer Bond Fund Class Y $13,240,035 68,498 Pioneer Cullen Value Fund Class Y 1,118,566 121,287 Pioneer Disciplined Growth Fund Class Y 1,123,116 201,239 Pioneer Disciplined Value Fund Class Y 1,696,443 20,032 Pioneer Emerging Markets Fund Class Y 572,308 24,915 Pioneer Equity Income Fund Class Y 561,829 81,436 Pioneer Floating Rate Fund Class Y 550,509 79,835 Pioneer Fund Class Y 2,812,576 108,951 Pioneer Fundamental Growth Fund Class Y 1,109,121 243,746 Pioneer Global Equity Fund Class Y 2,186,398 339,199 Pioneer Global High Yield Fund Class Y 3,344,501 23,673 Pioneer Growth Opportunities Fund Class Y 561,041 181,010 Pioneer High Yield Fund Class Y 1,677,960 100,789 Pioneer International Value Fund Class Y 1,832,341 29,092 Pioneer Mid Cap Value Fund Class Y 560,602 19 Pioneer Oak Ridge Large Cap Growth Fund Class Y 211 30,661 Pioneer Real Estate Shares Class Y 578,887 205,318 Pioneer Research Fund Class Y 1,683,605 37,491 Pioneer Select Mid Cap Growth Fund Class Y 560,494 1,357,469 Pioneer Short Term Income Fund Class Y 13,181,022 360,016 Pioneer Strategic Income Fund Class Y 3,877,370 - ------------------------------------------------------------------------------ TOTAL INVESTMENTS IN SECURITIES -- 93.7% (Cost $49,218,656) (a) $52,828,935 - ------------------------------------------------------------------------------ OTHER ASSETS AND LIABILITIES -- 6.3% $ 3,553,785 - ------------------------------------------------------------------------------ TOTAL NET ASSETS -- 100.0% $56,382,720 ============================================================================== * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At July 31, 2010, the net unrealized gain on investments based on cost for federal tax purposes of $50,203,607 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $3,933,922 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (1,308,594) ---------- Net unrealized gain $2,625,328 ========== Purchases and sales of securities (excluding temporary cash investments) for the year ended July 31, 2010 aggregated $14,486,647 and $6,214,282, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 39 Schedule of Investments | 7/31/10 Pioneer Ibbotson Conservative Allocation Fund (continued) Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. 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 risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of July 31, 2010, in valuing the Fund's assets: - -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - -------------------------------------------------------------------------------- Mutual Funds $52,828,935 $-- $-- $52,828,935 - -------------------------------------------------------------------------------- Total $52,828,935 $-- $-- $52,828,935 ================================================================================ The accompanying notes are an integral part of these financial statements. 40 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Schedule of Investments | 7/31/10 Pioneer Ibbotson Moderate Allocation Fund - ------------------------------------------------------------------------------- Shares Value - ------------------------------------------------------------------------------- MUTUAL FUNDS -- 97.4% PIONEER FUNDS* -- 97.4% 3,726,495 Pioneer Bond Fund Class Y $ 35,215,376 518,696 Pioneer Cullen Value Fund Class Y 8,470,305 684,660 Pioneer Disciplined Growth Fund Class Y 6,339,950 882,985 Pioneer Disciplined Value Fund Class Y 7,443,564 285,656 Pioneer Emerging Markets Fund Class Y 8,161,191 94,058 Pioneer Equity Income Fund Class Y 2,121,018 484,004 Pioneer Fund Class Y 17,051,473 742,147 Pioneer Fundamental Growth Fund Class Y 7,555,059 1,525,284 Pioneer Global Equity Fund Class Y 13,681,793 1,070,915 Pioneer Global High Yield Fund Class Y 10,559,226 555 Pioneer Government Income Fund Class Y 5,644 281,235 Pioneer Growth Opportunities Fund Class Y 6,665,262 242,745 Pioneer High Yield Fund Class Y 2,250,248 1,756 Pioneer Independence Fund Class Y 16,592 806,750 Pioneer International Value Fund Class Y 14,666,718 426,902 Pioneer Mid Cap Value Fund Class Y 8,226,398 3,017 Pioneer Oak Ridge Large Cap Growth Fund Class Y 32,614 57,964 Pioneer Oak Ridge Small Cap Growth Fund Class Y 1,356,347 474,312 Pioneer Real Estate Shares Class Y 8,955,001 1,024,197 Pioneer Research Fund Class Y 8,398,418 280,473 Pioneer Select Mid Cap Growth Fund Class Y 4,193,067 3,003,930 Pioneer Short Term Income Fund Class Y 29,168,165 392,761 Pioneer Strategic Income Fund Class Y 4,230,033 793 Pioneer Value Fund Class Y 8,149 - ------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 97.4% (Cost $193,018,909) (a) $204,771,611 - ------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 2.6% $ 5,541,659 - ------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $210,313,270 =============================================================================== * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At July 31, 2010, the net unrealized gain on investments based on cost for federal tax purposes of $196,512,213 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $15,420,369 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (7,160,971) ----------- Net unrealized gain $ 8,259,398 =========== Purchases and sales of securities (excluding temporary cash investments) for the year ended July 31, 2010 aggregated $19,740,164 and $41,011,462, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 41 Schedule of Investments | 7/31/10 Pioneer Ibbotson Moderate Allocation Fund (continued) Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. 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 risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of July 31, 2010, in valuing the Fund's assets: - -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - -------------------------------------------------------------------------------- Mutual Funds $204,771,611 $-- $-- $204,771,611 - -------------------------------------------------------------------------------- Total $204,771,611 $-- $-- $204,771,611 ================================================================================ The accompanying notes are an integral part of these financial statements. 42 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Schedule of Investments | 7/31/10 Pioneer Ibbotson Growth Allocation Fund - ------------------------------------------------------------------------------- Shares Value - ------------------------------------------------------------------------------- MUTUAL FUNDS -- 99.8% PIONEER FUNDS* -- 99.8% 3,118,860 Pioneer Bond Fund Class Y $ 29,473,230 643,570 Pioneer Cullen Value Fund Class Y 10,509,491 814,295 Pioneer Disciplined Growth Fund Class Y 7,540,370 797,413 Pioneer Disciplined Value Fund Class Y 6,722,191 432,290 Pioneer Emerging Markets Fund Class Y 12,350,526 282,222 Pioneer Equity Income Fund Class Y 6,364,109 479,171 Pioneer Fund Class Y 16,881,178 1,235,496 Pioneer Fundamental Growth Fund Class Y 12,577,345 1,863,611 Pioneer Global Equity Fund Class Y 16,716,592 613,269 Pioneer Global High Yield Fund Class Y 6,046,832 936 Pioneer Government Income Fund Class Y 9,506 386,367 Pioneer Growth Opportunities Fund Class Y 9,156,906 99,609 Pioneer High Yield Fund Class Y 923,372 15,768 Pioneer Independence Fund Class Y 149,012 962,176 Pioneer International Value Fund Class Y 17,492,361 680,417 Pioneer Mid Cap Value Fund Class Y 13,111,630 22,560 Pioneer Oak Ridge Large Cap Growth Fund Class Y 243,878 42,461 Pioneer Oak Ridge Small Cap Growth Fund Class Y 993,599 618,285 Pioneer Real Estate Shares Class Y 11,673,225 1,042,056 Pioneer Research Fund Class Y 8,544,863 282,565 Pioneer Select Mid Cap Growth Fund Class Y 4,224,348 1,528,230 Pioneer Short Term Income Fund Class Y 14,839,110 354,566 Pioneer Strategic Income Fund Class Y 3,818,672 18,927 Pioneer Value Fund Class Y 194,574 - ------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 99.8% (Cost $198,806,165) (a) $210,556,920 - ------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.2% $ 373,299 - ------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $210,930,219 =============================================================================== * Affiliated funds managed by Pioneer Investment Management, Inc. (a) At July 31, 2010, the net unrealized gain on investments based on cost for federal tax purposes of $201,059,942 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $18,337,140 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (8,840,162) ----------- Net unrealized gain $ 9,496,978 =========== Purchases and sales of securities (excluding temporary cash investments) for the year ended July 31, 2010 aggregated $25,323,768 and $38,060,126, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 43 Schedule of Investments | 7/31/10 Pioneer Ibbotson Growth Allocation Fund (continued) Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. 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 risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of July 31, 2010, in valuing the Fund's assets: - -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - -------------------------------------------------------------------------------- Mutual Funds $210,556,920 $-- $-- $210,556,920 - -------------------------------------------------------------------------------- Total $210,556,920 $-- $-- $210,556,920 ================================================================================ The accompanying notes are an integral part of these financial statements. 44 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Schedule of Investments | 7/31/10 Pioneer Ibbotson Aggressive Allocation Fund - ------------------------------------------------------------------------------- Shares Value - ------------------------------------------------------------------------------- MUTUAL FUNDS -- 100.0% PIONEER FUNDS* -- 100.0% 1,289,380 Pioneer Bond Fund Class Y $ 12,184,636 387,780 Pioneer Cullen Value Fund Class Y 6,332,441 498,662 Pioneer Disciplined Growth Fund Class Y 4,617,614 447,545 Pioneer Disciplined Value Fund Class Y 3,772,807 308,732 Pioneer Emerging Markets Fund Class Y 8,820,476 166,297 Pioneer Equity Income Fund Class Y 3,750,008 290,663 Pioneer Fund Class Y 10,240,042 721,900 Pioneer Fundamental Growth Fund Class Y 7,348,945 1,413,064 Pioneer Global Equity Fund Class Y 12,675,188 326,043 Pioneer Growth Opportunities Fund Class Y 7,727,230 2,420 Pioneer High Yield Fund Class Y 22,435 2,010 Pioneer Independence Fund Class Y 18,994 828,348 Pioneer International Value Fund Class Y 15,059,370 573,235 Pioneer Mid Cap Value Fund Class Y 11,046,229 4,947 Pioneer Oak Ridge Large Cap Growth Fund Class Y 53,482 25,645 Pioneer Oak Ridge Small Cap Growth Fund Class Y 600,089 495,856 Pioneer Real Estate Shares Class Y 9,361,770 613,486 Pioneer Research Fund Class Y 5,030,588 251,318 Pioneer Select Mid Cap Growth Fund Class Y 3,757,200 211,250 Pioneer Strategic Income Fund Class Y 2,275,164 2,055 Pioneer Value Fund Class Y 21,123 - ------------------------------------------------------------------------------- TOTAL INVESTMENTS IN SECURITIES -- 100.0% (Cost $115,690,163) (a) $124,715,831 - ------------------------------------------------------------------------------- OTHER ASSETS AND LIABILITIES -- 0.0%** $ 57,595 - ------------------------------------------------------------------------------- TOTAL NET ASSETS -- 100.0% $124,773,426 =============================================================================== * Affiliated funds managed by Pioneer Investment Management, Inc. ** Amount rounds to less than 0.1% (a) At July 31, 2010, the net unrealized gain on investments based on cost for federal tax purposes of $117,684,813 was as follows: Aggregate gross unrealized gain for all investments in which there is an excess of value over tax cost $12,604,859 Aggregate gross unrealized loss for all investments in which there is an excess of tax cost over value (5,573,841) ----------- Net unrealized gain $ 7,031,018 =========== Purchases and sales of securities (excluding temporary cash investments) for the year ended July 31, 2010 aggregated $15,635,167 and $28,570,938, respectively. Various inputs are used in determining the value of the Fund's investments. These inputs are summarized in the three broad levels listed below. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 45 Schedule of Investments | 7/31/10 Pioneer Ibbotson Aggressive Allocation Fund (continued) Highest priority is given to Level 1 inputs and lowest priority is given to Level 3. 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 risk, etc.) Level 3 -- significant unobservable inputs (including the Fund's own assumptions in determining fair value of investments) The following is a summary of the inputs used as of July 31, 2010, in valuing the Fund's assets: - -------------------------------------------------------------------------------- Level 1 Level 2 Level 3 Total - -------------------------------------------------------------------------------- Mutual Funds $124,715,831 $-- $-- $124,715,831 - -------------------------------------------------------------------------------- Total $124,715,831 $-- $-- $124,715,831 ================================================================================ The accompanying notes are an integral part of these financial statements. 46 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Statements of Assets and Liabilities | 7/31/10 - ------------------------------------------------------------------------------------------------------------------- Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund - ------------------------------------------------------------------------------------------------------------------- ASSETS: Investments in securities of affiliated $52,828,935 $204,771,611 $210,556,920 $124,715,831 issuers, at value (at cost $49,218,656, $193,018,909, $198,806,165 and $115,690,163, respectively) Cash 3,604,169 5,429,460 284,169 69,031 Receivables for: Investment Funds sold 93,312 199,860 242,366 66,291 Capital stock sold 7,619 59,183 108,536 37,179 Dividends 131,332 304,321 210,132 56,453 Due from Pioneer Investment -- 1,951 3,015 -- Management, Inc. Other assets 41,039 36,799 42,120 46,532 - ------------------------------------------------------------------------------------------------------------------- Total assets $56,706,406 $210,803,185 $211,447,258 $124,991,317 - ------------------------------------------------------------------------------------------------------------------- LIABILITIES: Payables for: Investments Funds purchased $ 99,792 $ -- $ 67,367 $ 814 Capital stock redeemed 115,746 260,456 194,372 46,105 Due to affiliates 39,949 154,824 175,067 102,828 Due to Pioneer Investment 8,927 -- -- 567 Management, Inc. Accrued expenses and other liabilities 59,272 74,635 80,233 67,577 - ------------------------------------------------------------------------------------------------------------------- Total liabilities $ 323,686 $ 489,915 $ 517,039 $ 217,891 - ------------------------------------------------------------------------------------------------------------------- NET ASSETS: Paid-in capital $57,956,668 $240,725,074 $252,491,911 $156,474,041 Undistributed net investment income 767,374 3,428,122 2,125,250 519,786 Accumulated net realized loss on (5,951,601) (45,592,628) (55,437,697) (41,246,069) investments Net unrealized gains on investments 3,610,279 11,752,702 11,750,755 9,025,668 - ------------------------------------------------------------------------------------------------------------------- Total net assets $56,382,720 $210,313,270 $210,930,219 $124,773,426 =================================================================================================================== NET ASSET VALUE PER SHARE: (No par value, unlimited number of shares authorized) Net Assets of Class A shares $35,986,272 $125,353,718 $125,432,692 $ 85,487,885 Net Assets of Class B shares $ 6,214,169 $ 33,114,666 $ 39,901,777 $ 19,256,027 Net Assets of Class C shares $14,063,106 $ 43,725,056 $ 43,087,309 $ 18,161,046 Net Assets of Class Y shares $ 119,173 $ 8,119,830 $ 2,508,441 $ 1,868,468 Class A Shares outstanding 3,530,298 12,946,142 12,839,562 8,940,214 Class B Shares outstanding 621,749 3,580,840 4,618,947 2,148,004 Class C Shares outstanding 1,411,530 4,807,329 4,651,267 1,999,465 Class Y Shares outstanding 12,173 828,694 249,047 193,125 Net Asset Value -- Class A share $ 10.19 $ 9.68 $ 9.77 $ 9.56 Net Asset Value -- Class B share $ 9.99 $ 9.25 $ 8.64 $ 8.96 Net Asset Value -- Class C share $ 9.96 $ 9.10 $ 9.26 $ 9.08 Net Asset Value -- Class Y share $ 9.79 $ 9.80 $ 10.07 $ 9.67 MAXIMUM OFFERING PRICE: Class A (100 [divided by] 94.25 x net asset value per share) $ 10.81 $ 10.27 $ 10.37 $ 10.14 =================================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 47 Statements of Operations For the Year Ended 7/31/10 - ----------------------------------------------------------------------------------------------------------- Conservative Moderate Growth Aggressive Allocation Allocation Allocation Allocation Fund Fund Fund Fund - ----------------------------------------------------------------------------------------------------------- INVESTMENT INCOME: Dividend income from securities of affiliated issuers $1,721,382 $ 5,116,897 $ 3,994,936 $ 1,652,669 Interest 1,050 1,326 255 93 - ----------------------------------------------------------------------------------------------------------- Total Investment Income $1,722,432 $ 5,118,223 $ 3,995,191 $ 1,652,762 - ----------------------------------------------------------------------------------------------------------- EXPENSES: Management fees $ 67,181 $ 273,553 $ 271,358 $ 166,038 Transfer agent fees Class A 33,765 150,547 257,831 209,454 Class B 12,345 82,620 137,645 76,529 Class C 13,812 45,992 64,248 35,369 Class Y 69 523 563 573 Distribution fees Class A 78,347 311,372 304,800 215,501 Class B 66,272 355,449 436,066 211,870 Class C 136,070 419,562 408,880 184,805 Shareholder communications expense 21,818 136,177 116,985 79,124 Administrative reimbursements 13,872 56,630 56,145 34,364 Custodian fees 24,162 93,611 89,694 61,206 Registration fees 58,068 60,339 59,122 53,052 Professional fees 58,075 70,097 60,788 56,602 Printing fees 535 26,128 44,803 35,593 Fees and expenses of nonaffiliated trustees 7,797 7,895 7,723 7,787 Insurance expense 984 4,765 4,541 2,769 Miscellaneous 1,281 291 425 1,082 - ----------------------------------------------------------------------------------------------------------- Total expenses $ 594,453 $ 2,095,551 $ 2,321,617 $ 1,431,718 Less fees waived and expenses reimbursed by Pioneer Investment Management, Inc. (21,280) (13,781) (49,204) (50,626) - ----------------------------------------------------------------------------------------------------------- Net expenses $ 573,173 $ 2,081,770 $ 2,272,413 $ 1,381,092 - ----------------------------------------------------------------------------------------------------------- Net investment income $1,149,259 $ 3,036,453 $ 1,722,778 $ 271,670 - ----------------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: Net realized loss on investments $ (320,589) $(5,275,077) $(8,084,401) $(4,653,983) Realized gain on distributions from investment company shares 142,535 968,503 1,083,627 761,721 - ----------------------------------------------------------------------------------------------------------- $ (178,054) $(4,306,574) $(7,000,774) $(3,892,262) - ----------------------------------------------------------------------------------------------------------- Change in net unrealized gain on investments $4,324,317 $26,406,558 $31,066,457 $19,913,617 - ----------------------------------------------------------------------------------------------------------- Net income on investments $4,146,263 $22,099,984 $24,065,683 $16,021,356 - ----------------------------------------------------------------------------------------------------------- Net increase in net assets resulting from operations $5,295,522 $25,136,437 $25,788,461 $16,293,025 =========================================================================================================== The accompanying notes are an integral part of these financial statements. 48 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Statements of Changes in Net Assets For the Years Ended 7/31/10 and 7/31/09, respectively - ---------------------------------------------------------------------------------------------------- Conservative Moderate Allocation Fund Allocation Fund ----------------------------- ----------------------------- Year Year Year Year Ended Ended Ended Ended 7/31/10 7/31/09 7/31/10 7/31/09 - ---------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 1,149,259 $ 1,561,507 $ 3,036,453 $ 5,669,905 Net realized loss on investments (178,054) (5,356,078) (4,306,574) (38,925,493) Change in net unrealized gain on investments 4,324,317 1,726,015 26,406,558 1,016,697 - ---------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $ 5,295,522 $ (2,068,556) $ 25,136,437 $(32,238,891) - ---------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income Class A ($0.32, $0.31, $0.27 and $0.13, respectively) $ (944,806) $ (747,663) $ (3,481,963) $ (1,669,230) Class B ($0.24, $0.23, $0.20 and $0.03, respectively) (172,245) (149,975) (795,035) (121,524) Class C ($0.25, $0.23, $0.22 and $0.06, respectively) (349,906) (248,688) (1,011,391) (247,061) Class Y ($0.29, $0.11, $0.31 and $0.18, respectively) (3,800) (100) (265,608) (201,422) Net realized gains on investments Class A ($0.00, $0.22, $0.00 and $0.61, respectively) -- (526,812) -- (7,648,955) Class B ($0.00, $0.22, $0.00 and $0.61, respectively) -- (140,521) -- (2,605,257) Class C ($0.00, $0.22, $0.00 and $0.61, respectively) -- (234,925) -- (2,544,858) Class Y ($0.00, $0.22, $0.00 and $0.61, respectively) -- (207) -- (668,871) - ---------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (1,470,757) $ (2,048,891) $ (5,553,997) $(15,707,178) - ---------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sales of shares $ 22,805,067 $ 19,287,993 $ 45,255,420 $ 41,171,734 Reinvestment of distributions 1,331,192 1,826,482 5,047,603 14,349,529 Cost of shares repurchased (14,720,155) (18,148,958) (61,082,551) (67,083,006) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from fund share transactions $ 9,416,104 $ 2,965,517 $(10,779,528) $(11,561,743) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 13,240,869 $ (1,151,930) $ 8,802,912 $(59,507,812) NET ASSETS: Beginning of year 43,141,851 44,293,781 201,510,358 261,018,170 - ---------------------------------------------------------------------------------------------------- End of year $ 56,382,720 $ 43,141,851 $210,313,270 $201,510,358 - ---------------------------------------------------------------------------------------------------- Undistributed net investment income, end of year $ 767,374 $ 1,022,298 $ 3,428,122 $ 5,553,462 - ---------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 49 Statements of Changes in Net Assets (continued) - -------------------------------------------------------------------------------------------------- Aggressive Growth Allocation Fund Allocation Fund ---------------------------- ----------------------------- Year Year Year Year Ended Ended Ended Ended 7/31/10 7/31/09 7/31/10 7/31/09 - -------------------------------------------------------------------------------------------------- FROM OPERATIONS: Net investment income $ 1,722,778 $ 3,493,456 $ 271,670 $ 920,901 Net realized loss on investments (7,000,774) (46,809,905) (3,892,262) (35,797,056) Change in net unrealized gain on investments 31,066,457 1,721,765 19,913,617 3,145,730 - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from operations $ 25,788,461 $(41,594,684) $ 16,293,025 $(31,730,425) - -------------------------------------------------------------------------------------------------- DISTRIBUTIONS TO SHAREOWNERS: Net investment income Class A ($0.18, $0.04, $0.09 and $0.00, respectively) $ (2,276,887) $ (517,538) $ (799,436) $ -- Class B ($0.12, $0.00, $0.02 and $0.00, respectively) (626,895) -- (46,119) -- Class C ($0.12, $0.00, $0.03 and $0.00, respectively) (548,334) -- (52,825) -- Class Y ($0.22, $0.10, $0.12 and $0.00, respectively) (49,812) (12,756) (22,968) -- Net realized gains on investments Class A ($0.00,$0.77, $0.00 and $0.95, respectively) -- (9,042,100) -- (8,008,516) Class B ($0.00, $0.77, $0.00 and $0.95, respectively) -- (4,285,462) -- (2,418,500) Class C ($0.00, $0.77, $0.00 and $0.95, respectively) -- (3,080,395) -- (1,816,045) Class Y ($0.00, $0.77, $0.00 and $0.95, respectively) -- (100,341) -- (216,797) - -------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (3,501,928) $(17,038,592) $ (921,348) $(12,459,858) - -------------------------------------------------------------------------------------------------- FROM FUND SHARE TRANSACTIONS: Net proceeds from sales of shares $ 40,428,087 $ 38,806,649 $ 22,571,282 $ 24,408,932 Reinvestment of distributions 3,299,908 15,852,835 884,792 11,779,918 Cost of shares repurchased (48,137,922) (54,927,329) (33,215,867) (32,217,796) - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets resulting from fund share transactions $ (4,409,927) $ (267,845) $ (9,759,793) $ 3,971,054 - -------------------------------------------------------------------------------------------------- Net increase (decrease) in net assets $ 17,876,606 $(58,901,121) $ 5,611,884 $(40,219,229) NET ASSETS: Beginning of year 193,053,613 251,954,734 119,161,542 159,380,771 - -------------------------------------------------------------------------------------------------- End of year $210,930,219 $193,053,613 $124,773,426 $119,161,542 - -------------------------------------------------------------------------------------------------- Undistributed net investment income, end of year $ 2,125,250 $ 3,503,204 $ 519,785 $ 920,231 - -------------------------------------------------------------------------------------------------- The accompanying notes are an integral part of these financial statements. 50 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 For the Years Ended 7/31/10 and 7/31/09, respectively - ---------------------------------------------------------------------------------------------------- Conservative Allocation Fund ---------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - ---------------------------------------------------------------------------------------------------- Class A Shares sold 1,393,061 $13,906,520 1,046,972 $9,181,773 Reinvestment of distributions 92,742 916,289 150,728 1,217,886 Less shares repurchased (719,307) (7,165,148) (988,287) (8,821,594) - ---------------------------------------------------------------------------------------------------- Net increase 766,496 $7,657,661 209,413 $1,578,065 ==================================================================================================== Class B Shares sold 209,249 $2,030,202 313,527 $2,691,195 Reinvestment of distributions 15,545 151,410 30,564 243,897 Less shares repurchased (247,840) (2,431,858) (317,104) (2,734,913) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (23,046) $ (250,246) 26,987 $ 200,179 ==================================================================================================== Class C Shares sold 687,384 $6,724,201 854,431 $7,415,025 Reinvestment of distributions 27,164 263,493 45,816 364,699 Less shares repurchased (517,664) (5,083,087) (766,827) (6,592,451) - ---------------------------------------------------------------------------------------------------- Net increase 196,884 $1,904,607 133,420 $1,187,273 ==================================================================================================== Class Y Shares sold 15,413 $ 144,144 -- $ -- Reinvestment of distributions -- -- -- -- Less shares repurchased (4,185) (40,062) -- -- - ---------------------------------------------------------------------------------------------------- Net increase 11,228 $ 104,082 -- $ -- ==================================================================================================== - ---------------------------------------------------------------------------------------------------- Moderate Allocation Fund ---------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - ---------------------------------------------------------------------------------------------------- Class A Shares sold 2,887,199 $27,533,502 2,821,624 $23,293,246 Reinvestment of distributions 356,824 3,400,536 1,232,334 9,094,621 Less shares repurchased (4,036,462) (38,109,320) (3,817,424) (31,882,235) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (792,439) $(7,175,282) 236,534 $ 505,632 ==================================================================================================== Class B Shares sold 385,358 $ 3,514,985 563,328 $ 4,411,845 Reinvestment of distributions 81,756 748,070 357,156 2,532,237 Less shares repurchased (1,072,515) (9,775,212) (1,594,459) (12,499,463) - ---------------------------------------------------------------------------------------------------- Net decrease (605,401) $(5,512,157) (673,975) $(5,555,381) ==================================================================================================== Class C Shares sold 1,424,845 $12,824,037 1,569,203 $12,180,557 Reinvestment of distributions 84,694 761,402 300,085 2,097,597 Less shares repurchased (1,229,570) (10,966,343) (1,767,600) (13,677,523) - ---------------------------------------------------------------------------------------------------- Net increase 279,969 $ 2,619,096 101,688 $ 600,631 ==================================================================================================== Class Y Shares sold 146,088 $ 1,382,896 149,844 $ 1,286,086 Reinvestment of distributions 14,303 137,595 84,242 625,074 Less shares repurchased (233,453) (2,231,676) (968,281) (9,023,785) - ---------------------------------------------------------------------------------------------------- Net decrease (73,062) $ (711,185) (734,195) $(7,112,625) ==================================================================================================== The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 51 Statements of Changes in Net Assets (continued) For the Years Ended 7/31/10 and 7/31/09, respectively - ---------------------------------------------------------------------------------------------------- Growth Allocation Fund --------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - ---------------------------------------------------------------------------------------------------- Class A Shares sold 2,547,743 $24,482,326 2,589,869 $21,222,690 Reinvestment of distributions 229,511 2,221,670 1,269,968 9,232,669 Less shares repurchased (2,682,381) (25,750,499) (3,263,979) (26,769,055) - ---------------------------------------------------------------------------------------------------- Net increase 94,873 $ 953,497 595,858 $ 3,686,304 ==================================================================================================== Class B Shares sold 272,654 $ 2,286,636 723,670 $ 5,311,140 Reinvestment of distributions 70,491 606,220 634,620 4,105,994 Less shares repurchased (1,322,892) (11,197,637) (1,730,142) (12,362,572) - ---------------------------------------------------------------------------------------------------- Net decrease (979,747) $(8,304,781) (371,852) $(2,945,438) ==================================================================================================== Class C Shares sold 1,389,233 $12,715,246 1,416,333 $10,929,968 Reinvestment of distributions 48,570 447,815 355,761 2,465,427 Less shares repurchased (1,194,324) (10,882,905) (1,724,566) (13,850,941) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) 243,479 $ 2,280,156 47,528 $ (455,546) ==================================================================================================== Class Y Shares sold 97,950 $ 943,879 158,272 $ 1,342,851 Reinvestment of distributions 2,430 24,203 6,534 48,745 Less shares repurchased (30,610) (306,881) (215,970) (1,944,761) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) 69,770 $ 661,201 (51,164) $ (553,165) ==================================================================================================== - ---------------------------------------------------------------------------------------------------- Aggressive Allocation Fund --------------------------------------------------------------- '10 Shares '10 Amount '09 Shares '09 Amount - ---------------------------------------------------------------------------------------------------- Class A Shares sold 1,760,958 $16,475,367 2,135,342 $16,907,966 Reinvestment of distributions 82,301 785,915 1,119,839 7,838,875 Less shares repurchased (2,306,323) (21,546,569) (2,536,617) (20,125,237) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (463,064) $(4,285,287) 718,564 $ 4,621,604 ==================================================================================================== Class B Shares sold 141,897 $ 1,235,373 321,078 $ 2,411,590 Reinvestment of distributions 4,939 44,456 347,880 2,296,007 Less shares repurchased (630,933) (5,573,218) (729,085) (5,288,157) - ---------------------------------------------------------------------------------------------------- Net decrease (484,097) $(4,293,389) (60,127) $ (580,560) ==================================================================================================== Class C Shares sold 497,963 $ 4,487,299 587,589 $ 4,479,431 Reinvestment of distributions 4,889 44,533 228,896 1,531,312 Less shares repurchased (639,004) (5,735,279) (686,801) (5,383,113) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) (136,152) $(1,203,447) 129,684 $ 627,630 ==================================================================================================== Class Y Shares sold 39,832 $ 373,243 72,124 $ 609,945 Reinvestment of distributions 1,024 9,888 16,085 113,724 Less shares repurchased (37,956) (360,801) (156,302) (1,421,289) - ---------------------------------------------------------------------------------------------------- Net increase (decrease) 2,900 $ 22,330 (68,093) $ (697,620) ==================================================================================================== The accompanying notes are an integral part of these financial statements. 52 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Financial Highlights - ------------------------------------------------------------------------------------------------------------ Conservative Allocation Fund ------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of year $ 9.40 $ 10.48 - ------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.25 $ 0.39 Net realized and unrealized gain (loss) on investments 0.86 (0.94) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 1.11 $ (0.55) - ------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.32) $ (0.31) Net realized gain -- (0.22) - ------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.32) $ (0.53) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.79 $ (1.08) - ------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 10.19 $ 9.40 ============================================================================================================ Total return* 11.88% (4.44)% Ratio of net expenses to average net assets+++ 0.78% 0.78% Ratio of net investment income to average net assets+++ 2.55% 4.43% Portfolio turnover rate 13% 53% Net assets, end of year (in thousands) $35,986 $25,992 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.84% 1.09% Net investment income 2.49% 4.12% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.78% 0.78% Net investment income 2.55% 4.43% ============================================================================================================ - --------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund ---------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - --------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 11.28 $ 10.56 $10.29 - --------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.33 $ 0.32 $ 0.25 Net realized and unrealized gain (loss) on investments (0.63) 0.61 0.09 - --------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.30) $ 0.93 $ 0.34 - --------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.35) $ (0.19) $(0.06) Net realized gain (0.15) (0.02) (0.01) - --------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.50) $ (0.21) $(0.07) - --------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.80) $ 0.72 $ 0.27 - --------------------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 10.48 $ 11.28 $10.56 =========================================================================================================================== Total return* (2.88)% 8.89% 3.33% Ratio of net expenses to average net assets+++ 0.78% 0.78% 0.78% Ratio of net investment income to average net assets+++ 2.96% 2.90% 2.38% Portfolio turnover rate 29% 15% 15% Net assets, end of year (in thousands) $26,782 $23,324 $8,837 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.89% 0.98% 2.12% Net investment income 2.86% 2.70% 1.04% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.78% 0.78% 0.78% Net investment income 2.97% 2.90% 2.38% =========================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 53 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------------- Conservative Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of year $ 9.24 $10.31 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.16 $ 0.31 Net realized and unrealized gain (loss) on investments 0.83 (0.93) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 0.99 $(0.62) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.24) $(0.23) Net realized gain -- (0.22) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.24) $(0.45) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.75 $(1.07) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.99 $ 9.24 =========================================================================================================== Total return* 10.80% (5.31)% Ratio of net expenses to average net assets+++ 1.68% 1.68% Ratio of net investment income to average net assets+++ 1.67% 3.58% Portfolio turnover rate 13% 53% Net assets, end of year (in thousands) $6,214 $5,957 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.70% 1.90% Net investment income 1.64% 3.36% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.68% 1.68% Net investment income 1.67% 3.58% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of year $11.10 $10.44 $10.28 - ------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.22 $ 0.21 $ 0.15 Net realized and unrealized gain (loss) on investments (0.61) 0.63 0.08 - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $(0.39) $ 0.84 $ 0.23 - ------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.25) $(0.16) $(0.06) Net realized gain (0.15) (0.02) (0.01) - ------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.40) $(0.18) $(0.07) - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $(0.79) $ 0.66 $ 0.16 - ------------------------------------------------------------------------------------------------------------------------- Net asset value, end of year $10.31 $11.10 $10.44 ========================================================================================================================= Total return* (3.72)% 8.09% 2.26% Ratio of net expenses to average net assets+++ 1.69% 1.69% 1.68% Ratio of net investment income to average net assets+++ 2.05% 1.91% 1.49% Portfolio turnover rate 29% 15% 15% Net assets, end of year (in thousands) $6,370 $4,729 $2,830 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.73% 1.91% 3.08% Net investment income 2.01% 1.69% 0.09% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.68% 1.68% 1.68% Net investment income 2.05% 1.92% 1.49% ========================================================================================================================= (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. 54 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ----------------------------------------------------------------------------------------------------------- Conservative Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of year $ 9.21 $ 10.30 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.17 $ 0.31 Net realized and unrealized gain (loss) on investments 0.83 (0.95) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.00 $ (0.64) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.25) $ (0.23) Net realized gain -- (0.22) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.25) $ (0.45) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.75 $ (1.09) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.96 $ 9.21 =========================================================================================================== Total return* 10.91% (5.53)% Ratio of net expenses to average net assets+++ 1.59% 1.68% Ratio of net investment income to average net assets+++ 1.73% 3.54% Portfolio turnover rate 13% 53% Net assets, end of year (in thousands) $14,063 $11,184 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.59% 1.80% Net investment income 1.73% 3.43% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.59% 1.68% Net investment income 1.73% 3.54% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of year $ 11.09 $10.44 $10.26 - ------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.23 $ 0.21 $ 0.15 Net realized and unrealized gain (loss) on investments (0.61) 0.62 0.10 - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.38) $ 0.83 $ 0.25 - ------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.26) $(0.16) $(0.06) Net realized gain (0.15) (0.02) (0.01) - ------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.41) $(0.18) $(0.07) - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (0.79) $ 0.65 $ 0.18 - ------------------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 10.30 $11.09 $10.44 ========================================================================================================================= Total return* (3.63)% 8.00% 2.46% Ratio of net expenses to average net assets+++ 1.63% 1.68% 1.68% Ratio of net investment income to average net assets+++ 2.10% 1.92% 1.48% Portfolio turnover rate 29% 15% 15% Net assets, end of year (in thousands) $11,132 $9,814 $5,201 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.63% 1.76% 2.80% Net investment income 2.10% 1.84% 0.36% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.63% 1.68% 1.68% Net investment income 2.11% 1.92% 1.48% ========================================================================================================================= (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 55 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------------- Conservative Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 9.02 $ 10.50 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(b) $ 0.28 $ (0.18) Net realized and unrealized gain (loss) on investments 0.78 (0.97) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.06 $ (1.15) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.29) $ (0.11) Net realized gain -- (0.22) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.29) $ (0.33) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.77 $ (1.48) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 9.79 $ 9.02 =========================================================================================================== Total return* 11.89% (10.66)% Ratio of net expenses to average net assets+++ 0.63% 7.26% Ratio of net investment income to average net assets+++ 2.94% (2.03)% Portfolio turnover rate 13% 53% Net assets, end of period (in thousands) $ 119 $ 9 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.63% 7.26% Net investment income (loss) 2.94% (2.03)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.63% 7.26% Net investment income (loss) 2.94% (2.03)% =========================================================================================================== - -------------------------------------------------------------------------------------------------------------------------- Conservative Allocation Fund --------------------------------------- Year Ended Year Ended 10/5/05 (a) 7/31/08 7/31/07 to 7/31/06 - -------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $11.30 $10.57 $10.32 - -------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss)(b) $ 0.28 $ 0.29 $ 0.16 Net realized and unrealized gain (loss) on investments (0.65) 0.65 0.16 - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $(0.37) $ 0.94 $ 0.32 - -------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.28) $(0.19) $(0.06) Net realized gain (0.15) (0.02) (0.01) - -------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.43) $(0.21) $(0.07) - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $(0.80) $ 0.73 $ 0.25 - -------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $10.50 $11.30 $10.57 ========================================================================================================================== Total return* (3.42)% 8.91% 3.13%** Ratio of net expenses to average net assets+++ 1.25% 0.90% 1.23%*** Ratio of net investment income to average net assets+++ 2.50% 2.64% 1.96%*** Portfolio turnover rate 29% 15% 15%** Net assets, end of period (in thousands) $ 10 $ 11 $ 10 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.25% 0.90% 2.19%*** Net investment income (loss) 2.50% 2.64% 0.98%*** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.23% 0.88% 1.23%*** Net investment income (loss) 2.52% 2.66% 1.96%*** ========================================================================================================================== (a) Commencement of operations. (b) 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. 56 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ---------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 8.79 $ 10.89 - ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.16 $ 0.27 Net realized and unrealized gain (loss) on investments 1.00 (1.63) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.16 $ (1.36) - ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.27) $ (0.13) Net realized gain -- (0.61) - ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.27) $ (0.74) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.89 $ (2.10) - ------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.68 $ 8.79 ============================================================================================================= Total return* 13.26% (11.20)% Ratio of net expenses to average net assets+++ 0.73% 0.74% Ratio of net investment income to average net assets+++ 1.70% 3.20% Portfolio turnover rate 10% 44% Net assets, end of year (in thousands) $125,354 $120,786 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.73% 0.76% Net investment income 1.70% 3.18% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.73% 0.74% Net investment income 1.70% 3.20% ============================================================================================================= - ----------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ----------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 12.50 $ 11.39 $ 11.15 - ----------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.24 $ 0.21 $ 0.16 Net realized and unrealized gain (loss) on investments (1.10) 1.21 0.38 - ----------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.86) $ 1.42 $ 0.54 - ----------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.31) $ (0.28) $ (0.06) Net realized gain (0.44) (0.03) (0.24) - ----------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.75) $ (0.31) $ (0.30) - ----------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.61) $ 1.11 $ 0.24 - ----------------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 10.89 $ 12.50 $ 11.39 ======================================================================================================================= Total return* (7.47)% 12.58% 4.98% Ratio of net expenses to average net assets+++ 0.65% 0.65% 0.63% Ratio of net investment income to average net assets+++ 2.03% 1.75% 1.40% Portfolio turnover rate 21% 19% 52% Net assets, end of year (in thousands) $147,004 $165,090 $148,495 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.65% 0.65% 0.63% Net investment income 2.03% 1.75% 1.40% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.65% 0.65% 0.63% Net investment income 2.03% 1.75% 1.40% ======================================================================================================================= (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 57 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of year $ 8.41 $10.39 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.08 $ 0.19 Net realized and unrealized gain (loss) on investments 0.96 (1.53) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.04 $(1.34) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.20) $(0.03) Net realized gain -- (0.61) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.20) $(0.64) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.84 $(1.98) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.25 $ 8.41 =========================================================================================================== Total return* 12.39% (11.81)% Ratio of net expenses to average net assets+++ 1.52% 1.52% Ratio of net investment income to average net assets+++ 0.92% 2.44% Portfolio turnover rate 10% 44% Net assets, end of year (in thousands) $33,115 $35,197 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.56% 1.63% Net investment income 0.88% 2.33% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.52% 1.52% Net investment income 0.92% 2.44% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------ Moderate Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of year $ 11.97 $ 10.92 $ 10.77 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.13 $ 0.11 $ 0.06 Net realized and unrealized gain (loss) on investments (1.06) 1.16 0.36 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.93) $ 1.27 $ 0.42 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.21) $ (0.19) $ (0.03) Net realized gain (0.44) (0.03) (0.24) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.65) $ (0.22) $ (0.27) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.58) $ 1.05 $ 0.15 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 10.39 $ 11.97 $ 10.92 ======================================================================================================================== Total return* (8.32)% 11.70% 4.00% Ratio of net expenses to average net assets+++ 1.52% 1.50% 1.51% Ratio of net investment income to average net assets+++ 1.16% 0.91% 0.51% Portfolio turnover rate 21% 19% 52% Net assets, end of year (in thousands) $50,515 $60,796 $55,053 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.52% 1.50% 1.51% Net investment income 1.16% 0.91% 0.51% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.51% 1.49% 1.51% Net investment income 1.17% 0.92% 0.51% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. 58 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ----------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of year $ 8.29 $ 10.30 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.09 $ 0.19 Net realized and unrealized gain (loss) on investments 0.94 (1.53) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.03 $ (1.34) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.22) $ (0.06) Net realized gain -- (0.61) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.22) $ (0.67) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.81 $ (2.01) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.10 $ 8.29 =========================================================================================================== Total return* 12.43% (11.85)% Ratio of net expenses to average net assets+++ 1.44% 1.52% Ratio of net investment income to average net assets+++ 0.98% 2.44% Portfolio turnover rate 10% 44% Net assets, end of year (in thousands) $43,725 $37,513 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.44% 1.52% Net investment income 0.98% 2.44% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.44% 1.52% Net investment income 0.98% 2.44% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------ Moderate Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of year $ 11.88 $ 10.85 $ 10.68 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.14 $ 0.12 $ 0.07 Net realized and unrealized gain (loss) on investments (1.05) 1.15 0.35 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (0.91) $ 1.27 $ 0.42 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.23) $ (0.21) $ (0.01) Net realized gain (0.44) (0.03) (0.24) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.67) $ (0.24) $ (0.25) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.58) $ 1.03 $ 0.17 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 10.30 $ 11.88 $ 10.85 ======================================================================================================================== Total return* (8.19)% 11.83% 4.06% Ratio of net expenses to average net assets+++ 1.39% 1.39% 1.42% Ratio of net investment income to average net assets+++ 1.28% 1.03% 0.60% Portfolio turnover rate 21% 19% 52% Net assets, end of year (in thousands) $45,594 $47,405 $32,416 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.39% 1.39% 1.42% Net investment income 1.28% 1.03% 0.60% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.39% 1.38% 1.42% Net investment income 1.28% 1.04% 0.60% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 59 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------------- Moderate Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 8.89 $ 10.94 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (b) $ 0.20 $ 0.29 Net realized and unrealized gain (loss) on investments 1.02 (1.55) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.22 $ (1.26) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.31) $ (0.18) Net realized gain -- (0.61) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.31) $ (0.79) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.91 $ (2.05) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 9.80 $ 8.89 =========================================================================================================== Total return* 13.75% (10.09)% Ratio of net expenses to average net assets+++ 0.33% 0.33% Ratio of net investment income to average net assets+++ 2.10% 3.59% Portfolio turnover rate 10% 44% Net assets, end of period (in thousands) $8,120 $ 8,015 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.33% 0.33% Net investment income 2.10% 3.59% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.33% 0.33% Net investment income 2.10% 3.59% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------- Moderate Allocation Fund --------------------------------------- Year Ended Year Ended 9/23/05 (a) 7/31/08 7/31/07 to 7/31/06 - ------------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 12.55 $ 11.43 $ 11.18 - ------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (b) $ 0.29 $ 0.26 $ 0.17 Net realized and unrealized gain (loss) on investments (1.11) 1.21 0.40 - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (0.82) $ 1.47 $ 0.57 - ------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.35) $ (0.32) $ (0.08) Net realized gain (0.44) (0.03) (0.24) - ------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.79) $ (0.35) $ (0.32) - ------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (1.61) $ 1.12 $ 0.25 - ------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 10.94 $ 12.55 $ 11.43 ========================================================================================================================= Total return* (7.10)% 12.98% 5.19%** Ratio of net expenses to average net assets+++ 0.27% 0.29% 0.28%*** Ratio of net investment income to average net assets+++ 2.40% 2.09% 1.79%*** Portfolio turnover rate 21% 19% 52%** Net assets, end of period (in thousands) $17,905 $24,046 $27,792 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.27% 0.29% 0.28%*** Net investment income 2.40% 2.09% 1.79%*** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.27% 0.29% 0.28%*** Net investment income 2.40% 2.09% 1.79%*** ========================================================================================================================= (a) Commencement of operations. (b) 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. 60 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ------------------------------------------------------------------------------------------------------------- Growth Allocation Fund -------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 8.74 $ 11.50 - ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.11 $ 0.19 Net realized and unrealized gain (loss) on investments 1.10 (2.14) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.21 $ (1.95) - ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.18) $ (0.04) Net realized gain -- (0.77) - ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.18) $ (0.81) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.03 $ (2.76) - ------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.77 $ 8.74 ============================================================================================================= Total return* 13.90% (15.49)% Ratio of net expenses to average net assets+++ 0.79% 0.79% Ratio of net investment income to average net assets+++ 1.12% 2.24% Portfolio turnover rate 11% 49% Net assets, end of year (in thousands) $125,433 $111,447 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.80% 0.89% Net investment income 1.11% 2.14% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.79% 0.79% Net investment income 1.12% 2.24% ============================================================================================================= - ------------------------------------------------------------------------------------------------------------------------ Growth Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class A Net asset value, beginning of year $ 13.47 $ 12.04 $ 11.50 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.16 $ 0.15 $ 0.09 Net realized and unrealized gain (loss) on investments (1.41) 1.61 0.63 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.25) $ 1.76 $ 0.72 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.25) $ (0.23) $ (0.05) Net realized gain (0.47) (0.10) (0.13) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.72) $ (0.33) $ (0.18) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.97) $ 1.43 $ 0.54 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 11.50 $ 13.47 $ 12.04 ======================================================================================================================== Total return* (9.88)% 14.73% 6.29% Ratio of net expenses to average net assets+++ 0.78% 0.72% 0.74% Ratio of net investment income to average net assets+++ 1.24% 1.09% 0.74% Portfolio turnover rate 20% 11% 27% Net assets, end of year (in thousands) $139,670 $157,453 $116,161 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.78% 0.72% 0.74% Net investment income 1.24% 1.09% 0.74% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.77% 0.71% 0.74% Net investment income 1.25% 1.10% 0.74% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 61 Financial Highlights (continued) - ------------------------------------------------------------------------------------------------------------ Growth Allocation Fund ------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of year $ 7.75 $ 10.33 - ------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.03 $ 0.11 Net realized and unrealized gain (loss) on investments 0.98 (1.92) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 1.01 $ (1.81) - ------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.12) $ -- Net realized gain -- (0.77) - ------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.12) $ (0.77) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 0.89 $ (2.58) - ------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 8.64 $ 7.75 ============================================================================================================ Total return* 13.03% (16.05)% Ratio of net expenses to average net assets+++ 1.57% 1.57% Ratio of net investment income to average net assets+++ 0.36% 1.47% Portfolio turnover rate 11% 49% Net assets, end of year (in thousands) $39,902 $43,390 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.66% 1.77% Net investment income (loss) 0.27% 1.27% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.57% 1.57% Net investment income (loss) 0.36% 1.47% ============================================================================================================ - ------------------------------------------------------------------------------------------------------------------------ Growth Allocation Fund --------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of year $ 12.17 $ 10.93 $ 10.50 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.05 $ 0.03 $ (0.01) Net realized and unrealized gain (loss) on investments (1.28) 1.45 0.59 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.23) $ 1.48 $ 0.58 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.14) $ (0.14) $ (0.02) Net realized gain (0.47) (0.10) (0.13) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.61) $ (0.24) $ (0.15) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.84) $ 1.24 $ 0.43 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 10.33 $ 12.17 $ 10.93 ======================================================================================================================== Total return* (10.66)% 13.67% 5.53% Ratio of net expenses to average net assets+++ 1.58% 1.58% 1.57% Ratio of net investment income to average net assets+++ 0.44% 0.23% (0.08)% Portfolio turnover rate 20% 11% 27% Net assets, end of year (in thousands) $61,704 $76,095 $61,373 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.64% 1.60% 1.62% Net investment income (loss) 0.38% 0.21% (0.13)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.57% 1.57% 1.57% Net investment income (loss) 0.45% 0.24% (0.08)% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. 62 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ----------------------------------------------------------------------------------------------------------- Growth Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of year $ 8.30 $ 10.99 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.04 $ 0.11 Net realized and unrealized gain (loss) on investments 1.04 (2.03) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.08 $ (1.92) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.12) $ -- Net realized gain -- (0.77) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.12) $ (0.77) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 0.96 $ (2.69) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.26 $ 8.30 =========================================================================================================== Total return* 13.08% (16.08)% Ratio of net expenses to average net assets+++ 1.51% 1.57% Ratio of net investment income to average net assets+++ 0.40% 1.44% Portfolio turnover rate 11% 49% Net assets, end of year (in thousands) $43,087 $36,602 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.51% 1.60% Net investment income 0.40% 1.40% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.51% 1.57% Net investment income 0.40% 1.44% =========================================================================================================== - ------------------------------------------------------------------------------------------------------------------------ Growth Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of year $ 12.90 $ 11.58 $ 11.10 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ 0.07 $ 0.05 $ -- Net realized and unrealized gain (loss) on investments (1.34) 1.53 0.61 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.27) $ 1.58 $ 0.61 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.17) $ (0.16) $ -- Net realized gain (0.47) (0.10) (0.13) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.64) $ (0.26) $ (0.13) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (1.91) $ 1.32 $ 0.48 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 10.99 $ 12.90 $ 11.58 ======================================================================================================================== Total return* (10.43)% 13.75% 5.51% Ratio of net expenses to average net assets+++ 1.48% 1.44% 1.46% Ratio of net investment income to average net assets+++ 0.54% 0.37% 0.02% Portfolio turnover rate 20% 11% 27% Net assets, end of year (in thousands) $47,898 $52,861 $33,315 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.48% 1.44% 1.46% Net investment income 0.54% 0.37% 0.02% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.47% 1.43% 1.46% Net investment income 0.54% 0.38% 0.02% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 63 Financial Highlights (continued) - ----------------------------------------------------------------------------------------------------------- Growth Allocation Fund ------------------------ Year Ended Year Ended 7/31/10 7/31/09 - ----------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 9.00 $ 11.64 - ----------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (b) $ 0.15 $ 0.20 Net realized and unrealized gain (loss) on investments 1.14 (1.97) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.29 $ (1.77) - ----------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.22) $ (0.10) Net realized gain -- (0.77) - ----------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.22) $ (0.87) - ----------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.07 $ (2.64) - ----------------------------------------------------------------------------------------------------------- Net asset value, end of period $10.07 $ 9.00 =========================================================================================================== Total return* 14.33% (13.68)% Ratio of net expenses to average net assets+++ 0.39% 0.39% Ratio of net investment income to average net assets+++ 1.54% 2.44% Portfolio turnover rate 11% 49% Net assets, end of period (in thousands) $2,508 $ 1,614 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.39% 0.39% Net investment income 1.54% 2.44% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.39% 0.39% Net investment income 1.54% 2.44% =========================================================================================================== - ---------------------------------------------------------------------------------------------------------------------- Growth Allocation Fund ------------------------------------ 9/26/05(a) Year Ended Year Ended to 7/31/08 7/31/07 7/31/06 - ---------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $13.55 $12.13 $11.54 - ---------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (b) $ 0.22 $ 0.19 $ 0.13 Net realized and unrealized gain (loss) on investments (1.36) 1.60 0.65 - ---------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $(1.14) $ 1.79 $ 0.78 - ---------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $(0.30) $(0.27) $(0.06) Net realized gain (0.47) (0.10) (0.13) - ---------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $(0.77) $(0.37) $(0.19) - ---------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $(1.91) $ 1.42 $ 0.59 - ---------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $11.64 $13.55 $12.13 ====================================================================================================================== Total return* (9.05)% 14.87% 6.84%** Ratio of net expenses to average net assets+++ 0.34% 0.36% 0.32%*** Ratio of net investment income to average net assets+++ 1.67% 1.40% 1.23%*** Portfolio turnover rate 20% 11% 27%** Net assets, end of period (in thousands) $2,683 $2,956 $3,068 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.34% 0.36% 0.32%*** Net investment income 1.67% 1.40% 1.23%*** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.34% 0.36% 0.32%*** Net investment income 1.67% 1.40% 1.23%*** ====================================================================================================================== (a) Commencement of operations. (b) 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. 64 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 8.45 $ 11.85 - ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.04 $ 0.09 Net realized and unrealized gain (loss) on investments 1.16 (2.54) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.20 $ (2.45) - ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.09) $ -- Net realized gain -- (0.95) - ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.09) $ (0.95) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.11 $ (3.40) - ------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.56 $ 8.45 ============================================================================================================= Total return* 14.16% (19.05)% Ratio of net expenses to average net assets+++ 0.85% 0.85% Ratio of net investment income to average net assets+++ 0.44% 1.07% Portfolio turnover rate 12% 55% Net assets, end of year (in thousands) $85,488 $79,480 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.88% 1.01% Net investment income 0.41% 0.91% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.85% 0.85% Net investment income 0.44% 1.07% ============================================================================================================= - -------------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund ---------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - -------------------------------------------------------------------------------------------------------------------------- Class A Net asset value, beginning of year $ 14.20 $ 12.39 $ 11.82 - -------------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ 0.07 $ 0.06 $ 0.01 Net realized and unrealized gain (loss) on investments (1.69) 1.97 0.85 - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.62) $ 2.03 $ 0.86 - -------------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.23) $ (0.16) $ (0.02) Net realized gain (0.50) (0.06) (0.27) - -------------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.73) $ (0.22) $ (0.29) - -------------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.35) $ 1.81 $ 0.57 - -------------------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 11.85 $ 14.20 $ 12.39 ========================================================================================================================== Total return* (12.03)% 16.41% 7.30% Ratio of net expenses to average net assets+++ 0.84% 0.82% 0.82% Ratio of net investment income to average net assets+++ 0.54% 0.44% 0.10% Portfolio turnover rate 13% 18% 51% Net assets, end of year (in thousands) $102,941 $114,054 $84,775 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.84% 0.82% 0.82% Net investment income 0.54% 0.44% 0.10% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.83% 0.81% 0.82% Net investment income 0.55% 0.45% 0.10% ========================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 65 Financial Highlights (continued) - ------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------- Class B Net asset value, beginning of year $ 7.93 $ 11.29 - ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (a) $ (0.03) $ 0.02 Net realized and unrealized gain (loss) on investments 1.08 (2.43) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.05 $ (2.41) - ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.02) $ -- Net realized gain -- (0.95) - ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.02) $ (0.95) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.03 $ (3.36) - ------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 8.96 $ 7.93 ============================================================================================================= Total return* 13.22% (19.69)% Ratio of net expenses to average net assets+++ 1.64% 1.64% Ratio of net investment income to average net assets+++ (0.33)% 0.28% Portfolio turnover rate 12% 55% Net assets, end of year (in thousands) $19,256 $20,884 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.76% 1.89% Net investment income (loss) (0.45)% 0.04% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.64% 1.64% Net investment income (loss) (0.33)% 0.28% ============================================================================================================= - ------------------------------------------------------------------------------------------------------------------------ Aggressive Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class B Net asset value, beginning of year $ 13.55 $ 11.84 $ 11.39 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (a) $ (0.03) $ (0.05) $ (0.08) Net realized and unrealized gain (loss) on investments (1.61) 1.88 0.80 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.64) $ 1.83 $ 0.72 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.12) $ (0.06) $ -- Net realized gain (0.50) (0.06) (0.27) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.62) $ (0.12) $ (0.27) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (2.26) $ 1.71 $ 0.45 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 11.29 $ 13.55 $ 11.84 ======================================================================================================================== Total return* (12.72)% 15.49% 6.36% Ratio of net expenses to average net assets+++ 1.65% 1.66% 1.64% Ratio of net investment income to average net assets+++ (0.28)% (0.39)% (0.70)% Portfolio turnover rate 13% 18% 51% Net assets, end of year (in thousands) $30,405 $37,749 $30,382 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.71% 1.69% 1.69% Net investment income (loss) (0.34)% (0.42)% (0.75)% 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% Net investment income (loss) (0.27)% (0.38)% (0.70)% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. 66 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - ------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------- Class C Net asset value, beginning of year $ 8.04 $ 11.43 - ------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.03) $ 0.02 Net realized and unrealized gain (loss) on investments 1.10 (2.46) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ 1.07 $ (2.44) - ------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.03) $ -- Net realized gain -- (0.95) - ------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.03) $ (0.95) - ------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ 1.04 $ (3.39) - ------------------------------------------------------------------------------------------------------------- Net asset value, end of year $ 9.08 $ 8.04 ============================================================================================================= Total return* 13.25% (19.71)% Ratio of net expenses to average net assets+++ 1.58% 1.64% Ratio of net investment income to average net assets+++ (0.31)% 0.27% Portfolio turnover rate 12% 55% Net assets, end of year (in thousands) $18,161 $17,171 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.58% 1.70% Net investment income (loss) (0.31)% 0.21% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.58% 1.64% Net investment income (loss) (0.31)% 0.27% - ------------------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------ Aggressive Allocation Fund -------------------------------------- Year Ended Year Ended Year Ended 7/31/08 7/31/07 7/31/06 - ------------------------------------------------------------------------------------------------------------------------ Class C Net asset value, beginning of year $ 13.73 $ 12.00 $ 11.54 - ------------------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (loss) (a) $ (0.02) $ (0.03) $ (0.08) Net realized and unrealized gain (loss) on investments (1.62) 1.90 0.81 - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ (1.64) $ 1.87 $ 0.73 - ------------------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $ (0.16) $ (0.08) $ -- Net realized gain (0.50) (0.06) (0.27) - ------------------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $ (0.66) $ (0.14) $ (0.27) - ------------------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ (2.30) $ 1.73 $ 0.46 - ------------------------------------------------------------------------------------------------------------------------ Net asset value, end of year $ 11.43 $ 13.73 $ 12.00 ======================================================================================================================== Total return* (12.61)% 15.63% 6.37% Ratio of net expenses to average net assets+++ 1.53% 1.52% 1.56% Ratio of net investment income to average net assets+++ (0.16)% (0.26)% (0.64)% Portfolio turnover rate 13% 18% 51% Net assets, end of year (in thousands) $22,930 $23,584 $15,524 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 1.53% 1.52% 1.56% Net investment income (loss) (0.16)% (0.26)% (0.64)% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 1.52% 1.52% 1.56% Net investment income (loss) (0.15)% (0.26)% (0.64)% ======================================================================================================================== (a) Calculated using average shares outstanding for the year. * 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. + 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. The accompanying notes are an integral part of these financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 67 Financial Highlights (continued) - ------------------------------------------------------------------------------------------------------------ Aggressive Allocation Fund -------------------------- Year Ended Year Ended 7/31/10 7/31/09 - ------------------------------------------------------------------------------------------------------------ Class Y Net asset value, beginning of period $ 8.55 $ 12.02 - ------------------------------------------------------------------------------------------------------------ Increase (decrease) from investment operations: Net investment income (b) $ 0.08 $ 0.13 Net realized and unrealized gain (loss) on investments 1.16 (2.65) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) from investment operations $ 1.24 $ (2.52) - ------------------------------------------------------------------------------------------------------------ Distributions to shareowners: Net investment income $(0.12) $ -- Net realized gain -- (0.95) - ------------------------------------------------------------------------------------------------------------ Total distributions to shareowners $(0.12) $ (0.95) - ------------------------------------------------------------------------------------------------------------ Net increase (decrease) in net asset value $ 1.12 $ (3.47) - ------------------------------------------------------------------------------------------------------------ Net asset value, end of period $ 9.67 $ 8.55 ============================================================================================================ Total return* 14.49% (19.35)% Ratio of net expenses to average net assets+++ 0.42% 0.43% Ratio of net investment income to average net assets+++ 0.88% 1.58% Portfolio turnover rate 12% 55% Net assets, end of period (in thousands) $1,868 $ 1,627 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.42% 0.43% Net investment income 0.88% 1.58% Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.42% 0.43% Net investment income 0.88% 1.58% ============================================================================================================ - ----------------------------------------------------------------------------------------------------------------------- Aggressive Allocation Fund -------------------------------------- 9/23/05(a) Year Ended Year Ended to 7/31/08 7/31/07 7/31/06 - ----------------------------------------------------------------------------------------------------------------------- Class Y Net asset value, beginning of period $ 14.26 $12.41 $11.87 - ----------------------------------------------------------------------------------------------------------------------- Increase (decrease) from investment operations: Net investment income (b) $ 0.15 $ 0.14 $ 0.06 Net realized and unrealized gain (loss) on investments (1.60) 1.97 0.78 - ----------------------------------------------------------------------------------------------------------------------- Net increase (decrease) from investment operations $ (1.45) $ 2.11 $ 0.84 - ----------------------------------------------------------------------------------------------------------------------- Distributions to shareowners: Net investment income $ (0.29) $(0.20) $(0.03) Net realized gain (0.50) (0.06) (0.27) - ----------------------------------------------------------------------------------------------------------------------- Total distributions to shareowners $ (0.79) $(0.26) $(0.30) - ----------------------------------------------------------------------------------------------------------------------- Net increase (decrease) in net asset value $ (2.24) $ 1.85 $ 0.54 - ----------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $ 12.02 $14.26 $12.41 ======================================================================================================================= Total return* (10.83)% 17.10% 7.13%** Ratio of net expenses to average net assets+++ 0.35% 0.39% 0.37%*** Ratio of net investment income to average net assets+++ 1.06% 1.01% 0.63%*** Portfolio turnover rate 13% 18% 51%** Net assets, end of period (in thousands) $ 3,105 $3,171 $4,607 Ratios with no waivers of fees and assumption of expenses by the Adviser and no reduction for fees paid indirectly: Net expenses 0.35% 0.39% 0.37%*** Net investment income 1.06% 1.01% 0.63%*** Ratios with waiver of fees and assumption of expenses by the Adviser and reduction for fees paid indirectly: Net expenses 0.35% 0.39% 0.37%*** Net investment income 1.06% 1.01% 0.63%*** ======================================================================================================================= (a) Commencement of operations. (b) 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. 68 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Notes to Financial Statements | 7/31/10 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. 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 in more developed markets, respectively. The Funds' prospectuses contain unaudited information regarding the Fund's principal risks. Please refer to those documents when considering the Funds' investment risks. The Board of Trustees has authorized the issuance of four classes of shares, designated as Class A, Class B, Class C and Class Y. Additional classes of shares have been authorized but are not referenced in the Fund's prospectus. The Conservative Fund Class A, Class B and Class C shares were first offered for sale to the public on May 12, 2005. Class Y shares were first offered for sale to the public on October 5, 2005. The Moderate Fund, Growth Fund and Aggressive Fund Class A, Class B and Class C shares were first offered for sale to the Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 69 public on August 9, 2004. Class Y shares of Moderate Fund, Growth Fund, and Aggressive Fund were first publicly offered on September 23, 2005. Effective as of the close of business on December 31, 2009, 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 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. 70 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Gains and losses on sales of investments are calculated on the identified cost method for both financial reporting and Federal income tax purposes. B. Federal Income Taxes It is the Funds' policy to comply with the requirements of the Internal Revenue Code applicable to regulated investment companies and to distribute all taxable income and net realized capital gains, if any, to shareholders. Therefore, no Federal income tax provisions are required. Tax years for the prior three fiscal years remain subject to examination by tax authorities. The amount and characterization of distributions to shareowners for financial reporting purposes is determined in accordance with Federal income tax rules. Therefore, the source of the Funds' distributions may be shown in the accompanying financial statements as either from or in excess of net investment income or net realized gain on investment transactions, or from paid-in capital, depending on the type of book/tax differences that may exist. At July 31, 2010, the Funds made reclassifications as listed below. These reclassifications have no impact on the net asset values of the respective Funds and are designed to present the Funds' capital accounts on a tax basis. ------------------------------------------------------------------------------ Undistributed Net Accumulated Investment Realized Fund Paid in Capital Income (Loss) Gain (Loss) ------------------------------------------------------------------------------ Conservative Fund $-- $ 66,574 $ (66,574) Moderate Fund -- 392,204 (392,204) Growth Fund -- 401,196 (401,196) Aggressive Fund -- 249,233 (249,233) The tax character of distributions paid during the year ended July 31, 2010 was as follows: ------------------------------------------------------------------------------ Ordinary Long-Term Fund Income Capital Gains Total ------------------------------------------------------------------------------ Conservative Fund $1,470,757 $-- $1,470,757 Moderate Fund 5,553,997 -- 5,553,997 Growth Fund 3,501,928 -- 3,501,928 Aggressive Fund 921,348 -- 921,348 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 71 The tax character of distributions paid during the year ended July 31, 2009 was as follows: ------------------------------------------------------------------------------ Ordinary Long-Term Fund Income Capital Gains Total ------------------------------------------------------------------------------ Conservative Fund $1,149,219 $ 899,672 $ 2,048,891 Moderate Fund 2,247,038 13,460,140 15,707,178 Growth Fund 536,834 16,501,758 17,038,592 Aggressive Fund 670 12,459,188 12,459,858 The following table shows the components of distributable earnings on a Federal income tax basis at July 31, 2010: -------------------------------------------------------------------------------- Undistributed Undistributed Net Unrealized Ordinary Long-Term Appreciation Fund Income Capital Gains (Depreciation) Total -------------------------------------------------------------------------------- Conservative Fund $ 767,291 $-- $2,625,328 $ 3,392,619 Moderate Fund 3,428,122 -- 8,259,398 11,687,520 Growth Fund 2,125,250 -- 9,496,978 11,622,228 Aggressive Fund 520,048 -- 7,031,017 7,551,065 The differences between book-basis and tax-basis unrealized appreciation 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 during the year ended July 31, 2010: ----------------------------------------------------------------------------- Fund Amount ----------------------------------------------------------------------------- Conservative Fund $30,535 Moderate Fund $55,797 Growth Fund $74,874 Aggressive Fund $50,056 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 the 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 72 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 fees paid to the transfer agent, Pioneer Investment Management Shareholder Services, Inc. (PIMSS), for its services are allocated among the classes 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 and Class C shares of each fund can reflect different transfer agent and distribution expense rates. E. Repurchase Agreements With respect to repurchase agreements entered into by a Fund, the value of the underlying securities (collateral), including accrued interest, is required to be equal to or in excess of the repurchase price. The collateral for all repurchase agreements is held in safekeeping in the customer-only account of a Fund's custodian or a subcustodian of a Fund. The Funds' investment adviser, PIM, is responsible for determining that the value of the collateral remains at least equal to the repurchase price. 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 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 year ended July 31, 2010, the effective management fee for each Fund was equivalent to 0.13% of the Fund's average daily net assets. PIM has entered into a sub-advisory agreement with Ibbotson Associates, LLC. PIM, not the Funds, pays a portion of the fee it receives from each Fund to Ibbotson Associates as compensation for 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. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 73 Included in "Due to affiliates" reflected on the Statement of Assets and Liabilities are the following amounts in management fees, administrative costs and certain other reimbursements payable to PIM at July 31, 2010: - -------------------------------------------------------------------------------- Fund Amount - -------------------------------------------------------------------------------- Conservative Fund $7,592 Moderate Fund $28,343 Growth Fund $28,292 Aggressive Fund $16,624 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, 2011 for Class A shares and through January 1, 2011 for Class B and Class C shares. There can be no assurance that PIM will extend the expense limitation agreement for a class of shares beyond the dates 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 July 31, 2010: - -------------------------------------------------------------------------------- Fund Amount - -------------------------------------------------------------------------------- Conservative Fund $7,035 Moderate Fund $33,181 Growth Fund $48,515 Aggressive Fund $36,092 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 its 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 74 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 fee for Class B and Class 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 Statement of Assets and Liabilities are the following amounts relating to distribution and service fees payable to PFD at July 31, 2010: - -------------------------------------------------------------------------------- Fund Amount - -------------------------------------------------------------------------------- Conservative Fund $25,322 Moderate Fund $93,300 Growth Fund $98,260 Aggressive Fund $50,112 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 18 months of purchase (within 12 months for purchases made on or after April 1, 2009). 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. For the period ended July 31, 2010, the following CDSCs were paid to PFD: - -------------------------------------------------------------------------------- Fund Amount - -------------------------------------------------------------------------------- Conservative Fund $9,543 Moderate Fund $64,044 Growth Fund $93,545 Aggressive Fund $49,548 5. Subsequent Events In preparing these financial statements, PIM has evaluated the impact of all events and transactions for potential recognition or disclosure and has determined that there were no subsequent events requiring recognition or disclosure in the financial statements. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 75 Report of Independent Registered Public Accounting Firm To the Board of Trustees and the Shareowners of Pioneer Ibbotson Asset Allocation Series: - -------------------------------------------------------------------------------- We have audited the accompanying statements of assets and liabilities of Pioneer Ibbotson Asset Allocation Series (the "Funds", comprising, respectively, the Pioneer Ibbotson Conservative Allocation Fund, the Pioneer Ibbotson Moderate Allocation Fund, the Pioneer Ibbotson Growth Allocation Fund and the Pioneer Ibbotson Aggressive Allocation Fund), including the schedule of investments, as of July 31, 2010, and the related statements of operations for the year then ended, the statements of changes in net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein. These financial statements and financial highlights are the responsibility of the Funds' management. Our responsibility is to express an opinion on these financial statements and financial highlights based on our audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements and financial highlights are free of material misstatement. We were not engaged to perform an audit of the Funds' internal control over financial reporting. Our audits included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Funds' internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements and financial highlights, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our procedures included confirmation of securities owned as of July 31, 2010 by correspondence with the custodian and transfer agent of the underlying funds. We believe that our audits provide a reasonable basis for our opinion. In our opinion, the financial statements and financial highlights referred to above present fairly, in all material respects, the financial position of each of the respective Funds constituting the Pioneer Ibbotson Asset Allocation Series at July 31, 2010, the results of their operations for the year then ended, the changes in their net assets for each of the two years in the period then ended, and the financial highlights for each of the periods indicated therein, in conformity with U.S. generally accepted accounting principles. /s/ Ernst & Young LLP Boston, Massachusetts September 24, 2010 76 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Trustees, Officers and Service Providers Investment Adviser Pioneer Investment Management, Inc. Custodian Brown Brothers Harriman & Co. Independent Registered Public Accounting Firm Ernst & Young LLP Principal Underwriter Pioneer Funds Distributor, Inc. Legal Counsel Bingham McCutchen LLP Shareowner Services and Transfer Agent Pioneer Investment Management Shareholder Services, Inc. Trustees and Officers The Funds' Trustees and officers are listed below, together with their principal occupations during at least the past five years. Trustees who are interested persons of the Funds within the meaning of the 1940 Act are referred to as Interested Trustees. Trustees who are not interested persons of the Funds are referred to as Independent Trustees. Each of the Trustees, except Mr. West, serves as a Trustee of each of the 58 U.S. registered investment portfolios for which Pioneer serves as investment adviser (the "Pioneer Funds"). Mr. West serves as a Trustee of 44 U.S. registered investment portfolios for which Pioneer serves as investment adviser. The address for all Trustees and all officers of the Fund is 60 State Street, Boston, Massachusetts 02109. Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 77 Interested Trustees - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Chairman of the Board, Trustee since 2004. Trustee and President Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Daniel K. Kingsbury (51)* Trustee and Executive Trustee since 2007. Vice President Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation(s) Held by this Trustee - ------------------------------------------------------------------------------------------------------------------------- John F. Cogan, Jr. (84)* Non-Executive Chairman and a Director of Pioneer Investment None Management USA Inc. ("PIM-USA"); Chairman and a Director of Pioneer; Chairman and Director of Pioneer Institutional Asset Management, Inc. (since 2006); Director of Pioneer Alternative Investment Management Limited (Dublin); President and a Direc- tor of Pioneer Alternative Investment Management (Bermuda) Limited and affiliated funds; Deputy Chairman and a Director of Pioneer Global Asset Management S.p.A. ("PGAM") (until April 2010); Director of PIOGLOBAL Real Estate Investment Fund (Russia) (until June 2006); Director of Nano-C, Inc. (since 2003); Director of Cole Management Inc. (since 2004); Director of Fiduciary Counseling, Inc.; President and Director of Pioneer Funds Distributor, Inc. ("PFD") (until May 2006); President of all of the Pioneer Funds; and Of Counsel, Wilmer Cutler Pickering Hale and Dorr LLP - ------------------------------------------------------------------------------------------------------------------------- Daniel K. Kingsbury (51)* Director, CEO and President of PIM-USA (since February 2007); None Director and President of Pioneer and Pioneer Institutional Asset Management, Inc. (since February 2007); Executive Vice President of all of the Pioneer Funds (since March 2007); Director of PGAM (2007 - 2010); Head of New Europe Division, PGAM (2000 - 2005); Head of New Markets Division, PGAM (2005 - 2007) - ------------------------------------------------------------------------------------------------------------------------- * Mr. Cogan and Mr. Kingsbury are Interested Trustees because they are officers or directors of the Funds' investment adviser and certain of its affiliates. 78 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Independent Trustees - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- David R. Bock (66) Trustee Trustee since 2005. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation(s) Held by this Trustee - ------------------------------------------------------------------------------------------------------------------------- David R. Bock (66) Interim Chief Executive Officer, Oxford Analytica, Inc. (privately- Director of Enterprise held research and consulting company) (2010 - present); Managing Community Investment, Inc. Partner, Federal City Capital Advisors (corporate advisory (privately-held affordable services company) (1997 - 2004 and 2008 - present); Executive housing finance company) Vice President and Chief Financial Officer, I-trax, Inc. (1985-present); Director of (publicly traded health care services company) (2004 - 2007); and Oxford Analytica, Inc. Executive Vice President and Chief Financial Officer, Pedestal Inc. (2008-present); Director of (internet-based mortgage trading company) (2000 - 2002) New York Mortgage Trust (publicly-traded mortgage REIT) (2004 - 2009) - ------------------------------------------------------------------------------------------------------------------------- Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 79 Independent Trustees (continued) - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- Mary K. Bush (62) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------------ Other Directorships Name and Age Principal Occupation(s) Held by this Trustee - ------------------------------------------------------------------------------------------------------------------------------ Mary K. Bush (62) President, Bush International, LLC (international financial Director of Marriott International, Inc. advisory firm) (1991 - present); Managing Director, Federal (2008 - present); Director of Discover Housing Finance Board (oversight of Federal Home Loan Financial Services (credit card issuer Bank system) (1989 - 1991); Vice President and Head of and electronic payment services) (2007 - International Finance, Federal National Mortgage Association present); Former Director of Briggs & (1988 - 1989); U.S. Alternate Executive Director, Stratton Co. (engine manufacturer) (2004 - International Monetary Fund (1984 - 1988); Executive 2009); Director of UAL Corporation Assistant to Deputy Secretary of the U.S. Treasury, U.S. (airline holding company) (2006 - Treasury Department (1982 - 1984); Vice President and Team present); Director of ManTech Leader in Corporate Banking, Bankers Trust Co. International Corporation (national (1976 - 1982) security, defense, and intelligence technology firm) (2006 - present); Member, Board of Governors, Investment Company Institute (2007 - present); Former Director of Brady Corporation (2000 - 2007); Former Director of Mortgage Guaranty Insurance Corporation (1991 -2006); Former Director of Millennium Chemicals, Inc. (commodity chemicals) (2002 - 2005); Former Director, R.J. Reynolds Tobacco Holdings, Inc. (tobacco) (1999 - 2005); Former Director of Texaco, Inc. (1997 - 2001) - ------------------------------------------------------------------------------------------------------------------------------ 80 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- Benjamin M. Friedman (65) Trustee Trustee since 2008. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Margaret B.W. Graham (63) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Thomas J. Perna (59) Trustee Trustee since 2006. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- Marguerite A. Piret (62) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------------------------------------ Other Directorships Name and Age Principal Occupation(s) Held by this Trustee - ------------------------------------------------------------------------------------------------------------------------------ Benjamin M. Friedman (65) William Joseph Maier Professor of Political Economy, Harvard Trustee, Mellon Institutional University (1972 - present) Funds Investment Trust and Mellon Institutional Funds Master Portfolio (oversaw 17 portfolios in fund complex (1989 - 2008) - ------------------------------------------------------------------------------------------------------------------------------ Margaret B.W. Graham (63) Founding Director, Vice-President and Corporate Secretary, The None Winthrop Group, Inc. (consulting firm); and Desautels Faculty of Management, McGill University (1999 - present); and Manager of Research Operations and Organizational Learning, Xerox PARC, Xerox's Advance Research Center (1990 - 1994) - ------------------------------------------------------------------------------------------------------------------------------ Thomas J. Perna (59) Chairman and Chief Executive Officer, Quadriserv, Inc. (technol- Director, Broadridge Financial ogy products for securities lending industry) (2008 - present); Solutions, Inc. (investor Private investor (2004 - 2008); and Senior Executive Vice Presi- communications and securities dent, The Bank of New York (financial and securities services) processing provider for (1986 - 2004) financial services industry) (2009 - present); Director, Quadriserv, Inc. (2005 - present) - ------------------------------------------------------------------------------------------------------------------------------ Marguerite A. Piret (62) President and Chief Executive Officer, Newbury, Piret & Company, Director of New America Inc. (investment banking firm) (1981 - present) High Income Fund, Inc. (closed-end investment company) (2004 - present); Member, Board of Governors, Investment Company Institute (2000 - 2006) - ------------------------------------------------------------------------------------------------------------------------------ Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 81 Independent Trustees (continued) - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- Stephen K. West (81) Trustee Trustee since 2004. Serves until a successor trustee is elected or earlier retirement or removal. - -------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation(s) Held by this Trustee - ----------------------------------------------------------------------------------------------------------------- Stephen K. West (81) Senior Counsel, Sullivan & Cromwell LLP (law firm) (1998 - Director, The Swiss Helvetia present); Partner, Sullivan & Cromwell LLP (prior to 1998) Fund, Inc. (closed-end investment company); Director, AMVESCAP, PLC (investment manager) (1997 - 2005) - ----------------------------------------------------------------------------------------------------------------- 82 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 Fund Officers - -------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - -------------------------------------------------------------------------------- Christopher J. Kelley (45) Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Carol B. Hannigan (49) Assistant Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Thomas Reyes (47) Assistant Secretary Since 2010. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Mark E. Bradley (50) Treasurer Since 2008. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Treasurer Since 2004. Serves at the discretion of the Board. - -------------------------------------------------------------------------------- Fund Officers - ----------------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation(s) Held by this Officer - ----------------------------------------------------------------------------------------------------------------------- Christopher J. Kelley (45) Vice President and Associate General Counsel of Pioneer since None January 2008 and Secretary of all of the Pioneer Funds since June 2010; Assistant Secretary of all of the Pioneer Funds from September 2003 to May 2010; Vice President and Senior Counsel of Pioneer from July 2002 to December 2007 - ----------------------------------------------------------------------------------------------------------------------- Carol B. Hannigan (49) Fund Governance Director of Pioneer since December 2006 and None Assistant Secretary of all the Pioneer Funds since June 2010; Manager - Fund Governance of Pioneer from December 2003 to November 2006; Senior Paralegal of Pioneer from January 2000 to November 2003 - ----------------------------------------------------------------------------------------------------------------------- Thomas Reyes (47) Counsel of Pioneer since June 2007 and Assistant Secretary of None all the Pioneer Funds since June 2010; Vice President and Counsel at State Street Bank from October 2004 to June 2007 - ----------------------------------------------------------------------------------------------------------------------- Mark E. Bradley (50) Vice President - Fund Accounting, Administration and None Controllership Services of Pioneer; and Treasurer of all of the Pioneer Funds since March 2008; Deputy Treasurer of Pioneer from March 2004 to February 2008; Assistant Treasurer of all of the Pioneer Funds from March 2004 to February 2008; and Treasurer and Senior Vice President, CDC IXIS Asset Management Services from 2002 to 2003 - ----------------------------------------------------------------------------------------------------------------------- Luis I. Presutti (45) Assistant Vice President - Fund Accounting, Administration and None Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------------- Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 83 Fund Officers (continued) - --------------------------------------------------------------------------------- Position Held Length of Service Name and Age With the Funds and Term of Office - --------------------------------------------------------------------------------- Gary Sullivan (52) Assistant Treasurer Since 2004. Serves at the discretion of the Board. - --------------------------------------------------------------------------------- David F. Johnson (30) Assistant Treasurer Since 2009. Serves at the discretion of the Board. - --------------------------------------------------------------------------------- Jean M. Bradley (57) Chief Compliance Since 2010. Serves at Officer the discretion of the Board. - --------------------------------------------------------------------------------- - ----------------------------------------------------------------------------------------------------------------- Other Directorships Name and Age Principal Occupation(s) Held by this Officer - ----------------------------------------------------------------------------------------------------------------- Gary Sullivan (52) Fund Accounting Manager - Fund Accounting, Administration and None Controllership Services of Pioneer; and Assistant Treasurer of all of the Pioneer Funds - ----------------------------------------------------------------------------------------------------------------- David F. Johnson (30) Fund Administration Manager - Fund Accounting, Administration None and Controllership Services since November 2008 and Assistant Treasurer of all of the Pioneer Funds since January 2009; Client Service Manager - Institutional Investor Services at State Street Bank from March 2003 to March 2007 - ----------------------------------------------------------------------------------------------------------------- Jean M. Bradley (57) Chief Compliance Officer of Pioneer and of all the Pioneer Funds None since March 2010; Director of Adviser and Portfolio Compliance at Pioneer since October 2005; Senior Compliance Officer for Columbia Management Advisers, Inc. from October 2003 to October 2005 - ----------------------------------------------------------------------------------------------------------------- 84 Pioneer Ibbotson Asset Allocation Series | Annual Report | 7/31/10 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 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 website: www.pioneerinvestments.com This report must be preceded or accompanied by a prospectus. The Fund files a complete statement 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 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 pioneerinvestments.com Securities offered through Pioneer Funds Distributor, Inc. 60 State Street, Boston, MA 02109 Underwriter of Pioneer Mutual Funds, Member SIPC (C) 2010 Pioneer Investments 19417-04-0910 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; (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. Audit Fees Fees for audit services provided to the Series, including fees associated with the filings of its Form N-1A, totaled approximately $149,943 in 2010 and approximately $149,943 in 2009. (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. Tax Fees Fees for tax compliance services, primarily for tax returns, totaled $33,160 in 2010 and $33,160 in 2009. (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. The aggregate non-audit fees for the Fund and affiliates, as previously defined, totaled approximately $33,160 in 2010 and $33,160 in 2009. (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 September 29, 2010 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 September 29, 2010 By (Signature and Title)* /s/ Mark Bradley Mark Bradley, Treasurer Date September 29, 2010 * Print the name and title of each signing officer under his or her signature.