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 811-3327 - ------------------------------------------------------------------------------- MFS SERIES TRUST XIII - ------------------------------------------------------------------------------- (Exact name of registrant as specified in charter) 500 Boylston Street, Boston, Massachusetts 02116 - ------------------------------------------------------------------------------- (Address of principal executive offices) (Zip code) Susan S. Newton Massachusetts Financial Services Company 500 Boylston Street Boston, Massachusetts 02116 - ------------------------------------------------------------------------------- (Name and address of agents for service) Registrant's telephone number, including area code: (617) 954-5000 - ------------------------------------------------------------------------------- Date of fiscal year end: February 28 - ------------------------------------------------------------------------------- Date of reporting period: August 31, 2007 - ------------------------------------------------------------------------------- ITEM 1. REPORTS TO STOCKHOLDERS. M F S(R) INVESTMENT MANAGEMENT [graphic omitted] SEMIANNUAL REPORT MFS(R) DIVERSIFIED INCOME FUND LETTER FROM THE CEO 1 - ------------------------------------------------------------ PORTFOLIO COMPOSITION 2 - ------------------------------------------------------------ EXPENSE TABLE 3 - ------------------------------------------------------------ PORTFOLIO OF INVESTMENTS 5 - ------------------------------------------------------------ STATEMENT OF ASSETS AND LIABILITIES 21 - ------------------------------------------------------------ STATEMENT OF OPERATIONS 23 - ------------------------------------------------------------ STATEMENTS OF CHANGES IN NET ASSETS 24 - ------------------------------------------------------------ FINANCIAL HIGHLIGHTS 25 - ------------------------------------------------------------ NOTES TO FINANCIAL STATEMENTS 28 - ------------------------------------------------------------ BOARD REVIEW OF INVESTMENT ADVISORY AGREEMENT 38 - ------------------------------------------------------------ PROXY VOTING POLICIES AND INFORMATION 42 - ------------------------------------------------------------ QUARTERLY PORTFOLIO DISCLOSURE 42 - ------------------------------------------------------------ CONTACT INFORMATION BACK COVER - ------------------------------------------------------------ THE REPORT IS PREPARED FOR THE GENERAL INFORMATION OF SHAREHOLDERS. IT IS AUTHORIZED FOR DISTRIBUTION TO PROSPECTIVE INVESTORS ONLY WHEN PRECEDED OR ACCOMPANIED BY A CURRENT PROSPECTUS. - ------------------------------------------------------------------------------- NOT FDIC INSURED o MAY LOSE VALUE o NO BANK OR CREDIT UNION GUARANTEE o NOT A DEPOSIT o NOT INSURED BY ANY FEDERAL GOVERNMENT AGENCY OR NCUA/NCUSIF - ------------------------------------------------------------------------------- 8/31/07 DIF-SEM LETTER FROM THE CEO [Photo of Robert J. Manning] Dear Shareholders: The past year has been a great example of why investors should keep their eyes on the long term. In 2006 the Dow Jones Industrial Average returned 19%. But the Dow's upward rise has not been without hiccups. After hitting new records in July 2007, the Dow lost 8% in the following weeks as a crisis swept global credit markets. As we have said before, markets can be volatile, and investors should make sure they have an investment plan that can carry them through the peaks and troughs. If you are focused on a long-term investment strategy, the short-term ups and downs of the markets should not necessarily dictate portfolio action on your part. Both the bond and stock markets are cyclical. In our view, investors who remain committed to a long-term plan are more likely to achieve their financial goals. We believe you should not let the headlines guide you in your investment decisions and should be cautious about overreacting to short- term volatility. In any market environment, we believe individual investors are best served by following a three-pronged investment strategy of allocating their holdings across the major asset classes, diversifying within each class, and regularly rebalancing their portfolios to maintain their desired allocations. Of course, these strategies cannot guarantee a profit or protect against a loss. Investing and planning for the long term require diligence and patience, two traits that in our experience are essential to capitalizing on the many opportunities the financial markets can offer -- through both up and down economic cycles. Respectfully, /s/ Robert J. Manning Robert J. Manning Chief Executive Officer and Chief Investment Officer MFS Investment Management(R) October 15, 2007 The opinions expressed in this letter are subject to change, may not be relied upon for investment advice, and no forecasts can be guaranteed. PORTFOLIO COMPOSITION PORTFOLIO STRUCTURE (i) Bonds 54.7% Common Stocks 40.1% Floating Rate Loans 2.0% Cash & Other Net Assets 3.2% TOP TEN HOLDINGS (i) Fannie Mae 5.5% 30 Years 3.2% ------------------------------------------------ U.S. Treasury Notes, 5.125%, 2016 2.4% ------------------------------------------------ Exxon Mobil Corp. 1.5% ------------------------------------------------ U.S. Treasury Notes, 5.125%, 2011 1.5% ------------------------------------------------ Bank of America Corp. 1.3% ------------------------------------------------ Chevron Corp. 1.1% ------------------------------------------------ Simon Property Group, Inc. 1.1% ------------------------------------------------ Citigroup Inc. 1.0% ------------------------------------------------ Freddie Mac, 4.625%, 2008 1.0% ------------------------------------------------ JPMorgan Chase & Co. 1.0% ------------------------------------------------ CREDIT QUALITY OF BONDS (r) AAA 36.1% ------------------------------------------------ A 2.8% ------------------------------------------------ BBB 8.6% ------------------------------------------------ BB 21.9% ------------------------------------------------ B 20.7% ------------------------------------------------ CCC 9.6% ------------------------------------------------ Not Rated 0.3% ------------------------------------------------ PORTFOLIO FACTS Average Duration (d)(i) 5.3 ------------------------------------------------ Average Life (i)(m) 9.1 yrs. ------------------------------------------------ Average Maturity (i)(m) 11.8 yrs. ------------------------------------------------ Average Credit Quality of Rated Securities (long-term) (a) BBB ------------------------------------------------ Average Credit Quality of Rated Securities (short-term) (a) A-1 ------------------------------------------------ (a) The average credit quality of rated securities is based upon a market weighted average of portfolio holdings that are rated by public rating agencies. (d) Duration is a measure of how much a bond's price is likely to fluctuate with general changes in interest rates, e.g., if rates rise 1.00%, a bond with a 5-year duration is likely to lose about 5.00% of its value. (i) For purposes of this presentation, the bond component includes both accrued interest amounts and the equivalent exposure from any derivative holdings, if applicable. (m) The average maturity shown is calculated using the final stated maturity on the portfolio's holdings without taking into account any holdings which have been pre-refunded or pre-paid to an earlier date or which have a mandatory put date prior to the stated maturity. The average life shown takes into account these earlier dates. (r) Each security is assigned a rating from Moody's Investors Service. If not rated by Moody's, the rating will be that assigned by Standard & Poor's. Likewise, if not assigned a rating by Standard & Poor's, it will be based on the rating assigned by Fitch, Inc. For those portfolios that hold a security which is not rated by any of the three agencies, the security is considered Not Rated. Holdings in U.S. Treasuries and government agency mortgage-backed securities, if any, are included in the "AAA"-rating category. Percentages are based on the total market value of investments as of 08/31/07. Percentages are based on net assets as of 08/31/07, unless otherwise noted. The portfolio is actively managed and current holdings may be different. EXPENSE TABLE Fund Expenses Borne by the Shareholders During the Period, March 1, 2007 through August 31, 2007 As a shareholder of the fund, you incur two types of costs: (1) transaction costs, including sales charges (loads) on certain purchase or redemption payments, and (2) ongoing costs, including management fees; distribution and service (12b-1) fees; and other fund expenses. This example is intended to help you understand your ongoing costs (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 invested at the beginning of the period and held for the entire period March 1, 2007 through August 31, 2007. ACTUAL EXPENSES The first line for each share class in the following table provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES The second line for each share class in the following table 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 table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as sales charges (loads). Therefore, the second line for each share class in the table 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 transactional costs were included, your costs would have been higher. - -------------------------------------------------------------------------------- Expenses Paid During Annualized Beginning Ending Period(p) Share Expense Account Value Account Value 3/01/07- Class Ratio 3/01/07 8/31/07 8/31/07 - -------------------------------------------------------------------------------- Actual 0.95% $1,000.00 $986.90 $4.74 A ------------------------------------------------------------------------ Hypothetical (h) 0.95% $1,000.00 $1,020.36 $4.82 - -------------------------------------------------------------------------------- Actual 1.65% $1,000.00 $984.30 $8.23 C ------------------------------------------------------------------------ Hypothetical (h) 1.65% $1,000.00 $1,016.84 $8.36 - -------------------------------------------------------------------------------- Actual 0.65% $1,000.00 $989.30 $3.25 I ------------------------------------------------------------------------ Hypothetical (h) 0.65% $1,000.00 $1,021.87 $3.30 - -------------------------------------------------------------------------------- (h) 5% class return per year before expenses. (p) Expenses paid is equal to each class' annualized expense ratio, as shown above, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year. Expenses paid do not include any applicable sales charges (loads). If these transaction costs had been included, your costs would have been higher. PORTFOLIO OF INVESTMENTS 8/31/07 (unaudited) The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes. Bonds - 54.7% - ---------------------------------------------------------------------------------------------------------------- ISSUER SHARES/PAR VALUE ($) - ---------------------------------------------------------------------------------------------------------------- Aerospace - 0.4% - ---------------------------------------------------------------------------------------------------------------- Bombardier, Inc., 8%, 2014 (n) $ 226,000 $ 233,345 Hawker Beechcraft Acquisition Co. LLC, 9.75%, 2017 (l)(n) 880,000 871,200 Vought Aircraft Industries, Inc., 8%, 2011 (l) 235,000 227,950 ------------ $ 1,332,495 - ---------------------------------------------------------------------------------------------------------------- Apparel Manufacturers - 0.2% - ---------------------------------------------------------------------------------------------------------------- Levi Strauss & Co., 9.75%, 2015 $ 500,000 $ 517,488 - ---------------------------------------------------------------------------------------------------------------- Automotive - 1.3% - ---------------------------------------------------------------------------------------------------------------- Ford Motor Credit Co., 8%, 2016 $ 545,000 $ 502,940 Ford Motor Credit Co., FRN, 8.11%, 2012 120,000 109,897 Ford Motor Credit Co. LLC, 9.75%, 2010 960,000 950,724 General Motors Corp., 8.375%, 2033 (l) 771,000 618,728 Goodyear Tire & Rubber Co., 9%, 2015 (l) 890,000 921,150 TRW Automotive, Inc., 7%, 2014 (n) 750,000 697,500 TRW Automotive, Inc., 7.25%, 2017 (n) 35,000 31,850 ------------ $ 3,832,789 - ---------------------------------------------------------------------------------------------------------------- Broadcasting - 1.7% - ---------------------------------------------------------------------------------------------------------------- Allbritton Communications Co., 7.75%, 2012 $ 380,000 $ 371,450 Bonten Media Acquisition Co., 9%, 2015 (n)(p) 285,000 247,950 CanWest MediaWorks LP, 9.25%, 2015 (n) 195,000 193,050 Clear Channel Communications, Inc., 5.5%, 2014 515,000 401,700 Grupo Televisa S.A., 8.5%, 2032 422,000 504,770 Intelsat Bermuda Ltd., 11.25%, 2016 1,870,000 1,956,488 ION Media Networks, Inc., FRN, 11.61%, 2013 (n) 455,000 455,000 LBI Media, Inc., 8.5%, 2017 (n) 185,000 181,531 Univision Communications, Inc., 9.75%, 2015 (l)(n)(p) 795,000 757,238 ------------ $ 5,069,177 - ---------------------------------------------------------------------------------------------------------------- Building - 0.2% - ---------------------------------------------------------------------------------------------------------------- Builders FirstSource, Inc., FRN, 9.808%, 2012 $ 100,000 $ 96,000 Nortek Holdings, Inc., 8.5%, 2014 95,000 82,175 Ply Gem Industries, Inc., 9%, 2012 485,000 407,400 ------------ $ 585,575 - ---------------------------------------------------------------------------------------------------------------- Business Services - 0.4% - ---------------------------------------------------------------------------------------------------------------- SunGard Data Systems, Inc., 10.25%, 2015 (l) $ 1,145,000 $ 1,179,350 - ---------------------------------------------------------------------------------------------------------------- Cable TV - 0.6% - ---------------------------------------------------------------------------------------------------------------- CCH II Holdings LLC, 10.25%, 2010 $ 250,000 $ 252,500 CCO Holdings LLC, 8.75%, 2013 965,000 945,700 CSC Holdings, Inc., 6.75%, 2012 400,000 378,000 NTL Cable PLC, 9.125%, 2016 200,000 202,250 ------------ $ 1,778,450 - ---------------------------------------------------------------------------------------------------------------- Chemicals - 1.0% - ---------------------------------------------------------------------------------------------------------------- Innophos, Inc., 8.875%, 2014 $ 615,000 $ 605,775 Koppers, Inc., 9.875%, 2013 190,000 197,600 Momentive Performance Materials, Inc., 11.5%, 2016 (l)(n) 1,020,000 974,100 Mosaic Co., 7.625%, 2016 (n) 550,000 563,750 Nalco Co., 8.875%, 2013 (l) 610,000 623,725 ------------ $ 2,964,950 - ---------------------------------------------------------------------------------------------------------------- Construction - 0.1% - ---------------------------------------------------------------------------------------------------------------- Urbi Desarrollos Urbanos S.A. de C.V., 8.5%, 2016 $ 200,000 $ 199,000 - ---------------------------------------------------------------------------------------------------------------- Consumer Goods & Services - 0.9% - ---------------------------------------------------------------------------------------------------------------- ACCO Brands Corp., 7.625%, 2015 $ 365,000 $ 341,275 Corrections Corp. of America, 6.25%, 2013 180,000 174,600 Jarden Corp., 7.5%, 2017 335,000 313,225 Kar Holdings, Inc., 10%, 2015 (n) 575,000 514,625 Service Corp. International, 7.375%, 2014 125,000 125,625 Service Corp. International, 6.75%, 2015 80,000 77,600 Service Corp. International, 7%, 2017 540,000 510,300 Visant Holding Corp., 8.75%, 2013 647,000 647,000 ------------ $ 2,704,250 - ---------------------------------------------------------------------------------------------------------------- Containers - 0.4% - ---------------------------------------------------------------------------------------------------------------- Greif, Inc., 6.75%, 2017 $ 570,000 $ 555,750 Owens-Brockway Glass Container, Inc., 8.25%, 2013 595,000 609,875 ------------ $ 1,165,625 - ---------------------------------------------------------------------------------------------------------------- Defense Electronics - 0.3% - ---------------------------------------------------------------------------------------------------------------- L-3 Communications Corp., 6.125%, 2014 $ 100,000 $ 96,500 L-3 Communications Corp., 5.875%, 2015 810,000 767,475 ------------ $ 863,975 - ---------------------------------------------------------------------------------------------------------------- Electronics - 0.7% - ---------------------------------------------------------------------------------------------------------------- Flextronics International Ltd., 6.25%, 2014 $ 480,000 $ 441,600 Freescale Semiconductor, Inc., 10.125%, 2016 (l) 765,000 665,550 NXP B.V./NXP Funding LLC, 7.875%, 2014 40,000 36,100 Spansion LLC, 11.25%, 2016 (n) 930,000 881,175 ------------ $ 2,024,425 - ---------------------------------------------------------------------------------------------------------------- Emerging Market Quasi-Sovereign - 3.0% - ---------------------------------------------------------------------------------------------------------------- Codelco, Inc., 5.625%, 2035 $ 1,145,000 $ 1,043,969 Gazprom International S.A., 6.212%, 2016 (l) 1,548,000 1,497,535 Gazprom International S.A., 7.201%, 2020 1,404,926 1,427,827 Gazprom International S.A., 6.51%, 2022 (n) 620,000 599,230 Majapahit Holding B.V., 7.75%, 2016 600,000 589,500 National Power Corp., 6.875%, 2016 (n) 100,000 95,375 National Power Corp., 6.875%, 2016 300,000 288,204 OAO Gazprom, 9.625%, 2013 300,000 342,000 Pemex Project Funding Master Trust, 8.625%, 2022 950,000 1,173,163 Pemex Project Funding Master Trust, 6.625%, 2035 1,887,000 1,929,420 ------------ $ 8,986,223 - ---------------------------------------------------------------------------------------------------------------- Emerging Market Sovereign - 8.7% - ---------------------------------------------------------------------------------------------------------------- Banque Centrale de Tunisie, 7.375%, 2012 $ 200,000 $ 214,000 Federative Republic of Brazil, 6%, 2017 1,371,000 1,362,774 Federative Republic of Brazil, 8%, 2018 1,033,000 1,136,300 Federative Republic of Brazil, 7.125%, 2037 (l) 800,000 871,200 Federative Republic of Brazil, 11%, 2040 (l) 332,000 439,402 Republic of Argentina, 7%, 2013 2,158,000 1,774,056 Republic of Argentina, 8.28%, 2033 (l) 774,359 662,077 Republic of Argentina, FRN, 5.389%, 2012 2,059,375 1,812,621 Republic of Colombia, 10.375%, 2033 20,000 28,460 Republic of Colombia, 7.375%, 2037 300,000 318,150 Republic of Colombia, FRN, 7.33%, 2015 796,000 824,258 Republic of Croatia, FRN, 6.188%, 2010 (l) 681,818 685,411 Republic of El Salvador, 7.65%, 2035 900,000 976,500 Republic of El Salvador, 7.65%, 2035 (n) 225,000 244,125 Republic of Indonesia, 8.5%, 2035 (l) 1,637,000 1,827,290 Republic of Panama, 9.375%, 2029 1,240,000 1,618,200 Republic of Panama, 6.7%, 2036 816,000 807,840 Republic of Peru, 6.55%, 2037 1,233,000 1,232,384 Republic of Philippines, 9.375%, 2017 460,000 538,200 Republic of Philippines, 9.5%, 2030 20,000 25,250 Republic of Philippines, 7.75%, 2031 (l) 900,000 956,250 Republic of South Africa, 5.875%, 2022 700,000 674,625 Republic of Turkey, 11.5%, 2012 16,000 19,070 Republic of Turkey, 9.5%, 2014 300,000 344,250 Republic of Turkey, 7.25%, 2015 20,000 20,600 Republic of Turkey, 7%, 2016 (l) 150,000 151,875 Republic of Turkey, 7.375%, 2025 297,000 303,683 Republic of Turkey, 8%, 2034 85,000 91,163 Republic of Turkey, 6.875%, 2036 800,000 751,000 Republic of Uruguay, 9.25%, 2017 630,000 733,950 Republic of Venezuela, 8.5%, 2014 1,307,000 1,257,988 Republic of Venezuela, 7%, 2018 (l) 206,000 173,555 Republic of Venezuela, 7.65%, 2025 727,000 623,403 Republica Orient Uruguay, 7.625%, 2036 700,000 728,000 United Mexican States, 8.3%, 2031 470,000 602,775 United Mexican States, 6.75%, 2034 1,113,000 1,208,718 ------------ $ 26,039,403 - ---------------------------------------------------------------------------------------------------------------- Energy - Independent - 1.2% - ---------------------------------------------------------------------------------------------------------------- Chaparral Energy, Inc., 8.875%, 2017 (n) $ 650,000 $ 585,000 Chesapeake Energy Corp., 6.875%, 2016 515,000 503,413 Forest Oil Corp., 7.25%, 2019 (n) 210,000 202,125 Hilcorp Energy I LP, 7.75%, 2015 (n) 95,000 90,963 Hilcorp Energy I LP, 9%, 2016 (n) 455,000 460,688 Mariner Energy, Inc., 8%, 2017 340,000 322,150 Plains Exploration & Production Co., 7%, 2017 500,000 455,000 Quicksilver Resources, Inc., 7.125%, 2016 1,045,000 997,975 ------------ $ 3,617,314 - ---------------------------------------------------------------------------------------------------------------- Energy - Integrated - 0.5% - ---------------------------------------------------------------------------------------------------------------- Petroleum Co. of Trinidad & Tobago Ltd., 6%, 2022 (n) $ 746,000 $ 751,088 TNK-BP Finance S.A., 7.5%, 2016 (n) 14,000 13,825 TNK-BP Finance S.A., 7.5%, 2016 700,000 691,250 ------------ $ 1,456,163 - ---------------------------------------------------------------------------------------------------------------- Financial Institutions - 0.4% - ---------------------------------------------------------------------------------------------------------------- General Motors Acceptance Corp., 6.875%, 2011 $ 535,000 $ 477,145 General Motors Acceptance Corp., 6.75%, 2014 635,000 538,904 General Motors Acceptance Corp., 8%, 2031 185,000 166,197 Residential Capital LLC, 7.125%, 2008 70,000 58,450 Residential Capital LLC, 7.5%, 2012 36,000 27,360 ------------ $ 1,268,056 - ---------------------------------------------------------------------------------------------------------------- Food & Beverages - 0.3% - ---------------------------------------------------------------------------------------------------------------- ARAMARK Corp., 8.5%, 2015 (l) $ 500,000 $ 498,125 Del Monte Corp., 6.75%, 2015 300,000 285,000 ------------ $ 783,125 - ---------------------------------------------------------------------------------------------------------------- Forest & Paper Products - 0.3% - ---------------------------------------------------------------------------------------------------------------- Buckeye Technologies, Inc., 8%, 2010 $ 434,000 $ 434,000 Millar Western Forest Products, 7.75%, 2013 585,000 457,763 ------------ $ 891,763 - ---------------------------------------------------------------------------------------------------------------- Gaming & Lodging - 1.3% - ---------------------------------------------------------------------------------------------------------------- Fontainebleau Las Vegas Holdings LLC, 10.25%, 2015 (l)(n) $ 630,000 $ 540,225 Harrah's Entertainment, Inc., 5.75%, 2017 750,000 562,500 Isle of Capri Casinos, Inc., 7%, 2014 500,000 433,750 Majestic Star Casino LLC, 9.75%, 2011 830,000 705,500 MGM Mirage, Inc., 6.75%, 2013 750,000 727,500 Station Casinos, Inc., 6.5%, 2014 520,000 440,700 Wimar Opco LLC, 9.625%, 2014 (n) 600,000 444,000 ------------ $ 3,854,175 - ---------------------------------------------------------------------------------------------------------------- Industrial - 0.1% - ---------------------------------------------------------------------------------------------------------------- Blount, Inc., 8.875%, 2012 (l) $ 325,000 $ 325,000 - ---------------------------------------------------------------------------------------------------------------- Insurance - Health - 0.0% - ---------------------------------------------------------------------------------------------------------------- Centene Corp., 7.25%, 2014 $ 145,000 $ 141,375 - ---------------------------------------------------------------------------------------------------------------- Insurance - Property & Casualty - 0.1% - ---------------------------------------------------------------------------------------------------------------- USI Holdings Corp., 9.75%, 2015 (n) $ 215,000 $ 196,725 - ---------------------------------------------------------------------------------------------------------------- Medical & Health Technology & Services - 1.2% - ---------------------------------------------------------------------------------------------------------------- Advanced Medical Optics, Inc., 7.5%, 2017 $ 295,000 $ 269,188 Community Health Systems, Inc., 8.875%, 2015 (n) 460,000 459,425 Cooper Cos., Inc., 7.125%, 2015 310,000 296,050 DaVita, Inc., 7.25%, 2015 (l) 720,000 705,600 HCA, Inc., 6.375%, 2015 395,000 321,925 HealthSouth Corp., 10.75%, 2016 150,000 154,500 Omnicare, Inc., 6.875%, 2015 500,000 466,250 Psychiatric Solutions, Inc., 7.75%, 2015 190,000 186,200 U.S. Oncology, Inc., 10.75%, 2014 450,000 452,250 Universal Hospital Services, Inc., 8.5%, 2015 (n)(p) 205,000 194,750 Universal Hospital Services, Inc., FRN, 8.759%, 2015 (n) 65,000 62,725 VWR Funding, Inc., 10.25%, 2015 (n) 155,000 144,150 ------------ $ 3,713,013 - ---------------------------------------------------------------------------------------------------------------- Metals & Mining - 1.2% - ---------------------------------------------------------------------------------------------------------------- FMG Finance Ltd., 10.625%, 2016 (n) $ 790,000 $ 904,550 Foundation PA Coal Co., 7.25%, 2014 35,000 33,513 Freeport-McMoRan Copper & Gold, Inc., 8.25%, 2015 250,000 265,000 Freeport-McMoRan Copper & Gold, Inc., 8.375%, 2017 580,000 617,700 Peabody Energy Corp., 7.375%, 2016 105,000 105,788 Peabody Energy Corp., "B", 6.875%, 2013 1,040,000 1,037,400 PNA Group, Inc., 10.75%, 2016 (n) 500,000 515,625 ------------ $ 3,479,576 - ---------------------------------------------------------------------------------------------------------------- Mortgage Backed - 10.0% - ---------------------------------------------------------------------------------------------------------------- Fannie Mae, 5.972%, 2008 $ 100,524 $ 100,453 Fannie Mae, 4.374%, 2013 134,507 128,643 Fannie Mae, 4.495%, 2013 188,002 180,426 Fannie Mae, 4.51%, 2013 125,030 120,485 Fannie Mae, 5.369%, 2013 98,319 99,988 Fannie Mae, 4.56%, 2014 - 2015 216,927 207,895 Fannie Mae, 4.76%, 2014 97,598 94,623 Fannie Mae, 4.88%, 2014 105,449 102,404 Fannie Mae, 4.935%, 2014 170,903 167,109 Fannie Mae, 4.991%, 2014 176,787 172,552 Fannie Mae, 5.033%, 2014 321,449 313,379 Fannie Mae, 4.6%, 2015 29,144 27,948 Fannie Mae, 4.69%, 2015 203,596 196,959 Fannie Mae, 4.7%, 2015 62,830 60,784 Fannie Mae, 4.78%, 2015 86,460 83,844 Fannie Mae, 4.79%, 2015 129,853 124,826 Fannie Mae, 4.85%, 2015 187,278 182,855 Fannie Mae, 4.856%, 2015 157,466 151,935 Fannie Mae, 4.925%, 2015 154,767 150,470 Fannie Mae, 4.97%, 2015 194,457 188,896 Fannie Mae, 5.022%, 2015 171,561 167,876 Fannie Mae, 5.034%, 2015 113,929 111,288 Fannie Mae, 5.09%, 2016 68,669 67,722 Fannie Mae, 5.259%, 2016 75,000 73,684 Fannie Mae, 5.423%, 2016 34,409 34,344 Fannie Mae, 5.574%, 2016 113,051 112,080 Fannie Mae, 5.93%, 2016 123,156 126,414 Fannie Mae, 6.039%, 2016 74,400 76,639 Fannie Mae, 4.996%, 2017 284,562 277,332 Fannie Mae, 5.218%, 2017 70,000 68,550 Fannie Mae, 5.32%, 2017 116,671 114,746 Fannie Mae, 5.456%, 2017 115,000 114,369 Fannie Mae, 5.476%, 2017 169,500 168,757 Fannie Mae, 5.5%, 2017 - 2037 11,232,408 11,002,166 Fannie Mae, 5.631%, 2017 113,562 114,231 Fannie Mae, 5.724%, 2017 190,000 192,290 Fannie Mae, 6%, 2017 - 2037 3,339,529 3,348,527 Fannie Mae, 6.5%, 2017 - 2037 370,564 376,530 Fannie Mae, 4.5%, 2018 - 2020 2,140,263 2,057,684 Fannie Mae, 5%, 2025 1,486,020 1,481,582 Freddie Mac, 4.5%, 2015 - 2021 164,066 162,774 Freddie Mac, 6%, 2017 - 2036 382,921 383,785 Freddie Mac, 5%, 2018 - 2027 2,379,009 2,359,590 Freddie Mac, 4%, 2024 282,728 279,211 Freddie Mac, 5.5%, 2024 - 2035 1,243,026 1,234,556 Freddie Mac, 6.5%, 2037 1,550,605 1,574,026 Ginnie Mae, 5.5%, 2033 977,789 962,502 ------------ $ 29,899,729 - ---------------------------------------------------------------------------------------------------------------- Municipals - 0.4% - ---------------------------------------------------------------------------------------------------------------- California Educational Facilities Authority Rev. (Stanford University), "T-1", 5%, 2039 $ 585,000 $ 624,751 Puerto Rico Highway and Transportation Authority Rev., "N", FGIC, 5.25%, 2039 540,000 588,746 ------------ $ 1,213,497 - ---------------------------------------------------------------------------------------------------------------- Natural Gas - Distribution - 0.3% - ---------------------------------------------------------------------------------------------------------------- AmeriGas Partners LP, 7.125%, 2016 $ 300,000 $ 288,000 Inergy LP, 6.875%, 2014 820,000 783,100 ------------ $ 1,071,100 - ---------------------------------------------------------------------------------------------------------------- Natural Gas - Pipeline - 1.2% - ---------------------------------------------------------------------------------------------------------------- Deutsche Bank (El Paso Performance-Linked Trust, CLN), 7.75%, 2011 (n) $ 450,000 $ 461,043 Intergas Finance B.V., 6.375%, 2017 (n) 2,140,000 1,995,550 Williams Cos., Inc., 8.75%, 2032 1,000,000 1,137,500 Williams Partners LP, 7.25%, 2017 175,000 173,250 ------------ $ 3,767,343 - ---------------------------------------------------------------------------------------------------------------- Network & Telecom - 0.3% - ---------------------------------------------------------------------------------------------------------------- Cincinnati Bell, Inc., 8.375%, 2014 $ 55,000 $ 54,450 Citizens Communications Co., 9.25%, 2011 250,000 268,125 Nordic Telephone Co. Holdings, 8.875%, 2016 (n) 195,000 201,825 Qwest Capital Funding, Inc., 7.25%, 2011 235,000 231,475 Windstream Corp., 7%, 2019 65,000 61,263 ------------ $ 817,138 - ---------------------------------------------------------------------------------------------------------------- Oil Services - 0.5% - ---------------------------------------------------------------------------------------------------------------- Basic Energy Services, Inc., 7.125%, 2016 $ 220,000 $ 201,300 Compagnie Generale de Geophysique - Veritas, 7.75%, 2017 1,170,000 1,181,700 ------------ $ 1,383,000 - ---------------------------------------------------------------------------------------------------------------- Other Banks & Diversified Financials - 1.3% - ---------------------------------------------------------------------------------------------------------------- Banco BMG S.A., 9.15%, 2016 $ 300,000 $ 309,390 Banco do Estado de Sao Paulo S.A., 8.7%, 2049 300,000 299,250 Banco do Estado de Sao Paulo S.A., 8.7%, 2049 (n) 80,000 83,500 HSBK Europe B.V., 7.25%, 2017 (n) 1,496,000 1,406,240 ICICI Bank Ltd., FRN, 6.375%, 2022 (n) 101,000 94,643 RSHB Capital S.A., 7.175%, 2013 (l) 1,150,000 1,175,875 RSHB Capital S.A., 6.299%, 2017 (n) 141,000 133,245 Russian Standard Finance S.A., 8.625%, 2011 500,000 465,000 VTB Capital S.A., 7.5%, 2011 54,000 56,015 ------------ $ 4,023,158 - ---------------------------------------------------------------------------------------------------------------- Precious Metals & Minerals - 0.6% - ---------------------------------------------------------------------------------------------------------------- Alrosa Finance S.A., 8.875%, 2014 $ 1,700,000 $ 1,852,320 - ---------------------------------------------------------------------------------------------------------------- Printing & Publishing - 1.0% - ---------------------------------------------------------------------------------------------------------------- American Media Operations, Inc., 10.25%, 2009 (l) $ 500,000 $ 440,000 Dex Media, Inc., 0% to 2008, 9% to 2013 250,000 230,625 Idearc, Inc., 8%, 2016 685,000 676,438 Nielsen Finance LLC, 0% to 2011, 12.5% to 2016 1,765,000 1,186,963 R.H. Donnelley Corp., 8.875%, 2016 530,000 543,250 ------------ $ 3,077,276 - ---------------------------------------------------------------------------------------------------------------- Retailers - 0.3% - ---------------------------------------------------------------------------------------------------------------- Couche-Tard, Inc., 7.5%, 2013 $ 220,000 $ 215,600 Rite Aid Corp., 9.5%, 2017 (n) 225,000 204,188 Sally Beauty Holdings. Inc., 9.25%, 2014 410,000 403,850 ------------ $ 823,638 - ---------------------------------------------------------------------------------------------------------------- Specialty Stores - 0.2% - ---------------------------------------------------------------------------------------------------------------- Claire's Stores, Inc., 9.25%, 2015 (l)(n) $ 275,000 $ 238,563 Claire's Stores, Inc., 10.5%, 2017 (l)(n) 140,000 103,600 Michaels Stores, Inc., 11.375%, 2016 (l)(n) 185,000 179,913 Payless ShoeSource, Inc., 8.25%, 2013 80,000 74,000 ------------ $ 596,076 - ---------------------------------------------------------------------------------------------------------------- Supermarkets - 0.1% - ---------------------------------------------------------------------------------------------------------------- Stater Brothers Holdings, Inc., 7.75%, 2015 (n) $ 230,000 $ 223,100 SUPERVALU, Inc., 7.5%, 2014 185,000 186,850 ------------ $ 409,950 - ---------------------------------------------------------------------------------------------------------------- Telecommunications - Wireless - 0.3% - ---------------------------------------------------------------------------------------------------------------- MetroPCS Wireless, Inc., 9.25%, 2014 (n) $ 200,000 $ 197,000 UBS Luxembourg S.A., 8.25%, 2016 300,000 301,500 Wind Acquisition Finance S.A., 10.75%, 2015 (n) 375,000 386,250 ------------ $ 884,750 - ---------------------------------------------------------------------------------------------------------------- Transportation - Services - 0.2% - ---------------------------------------------------------------------------------------------------------------- Hertz Corp., 8.875%, 2014 $ 595,000 $ 615,825 - ---------------------------------------------------------------------------------------------------------------- U.S. Government Agencies - 5.3% - ---------------------------------------------------------------------------------------------------------------- Fannie Mae, 6.625%, 2009 (l) $ 1,932,000 $ 2,003,094 Fannie Mae, 6%, 2011 (l) 1,340,000 1,396,244 Fannie Mae, 4.625%, 2013 (l) 2,581,000 2,544,267 Fannie Mae, 5.25%, 2016 (l) 1,916,000 1,937,699 Fannie Mae, 7.125%, 2030 (l) 1,234,000 1,512,036 Freddie Mac, 4.625%, 2008 (l) 2,986,000 2,975,651 Freddie Mac, 5.125%, 2008 200,000 199,879 Freddie Mac, 5.4%, 2009 2,522,000 2,533,596 Small Business Administration, 6.34%, 2021 485,123 499,402 Small Business Administration, 6.07%, 2022 416,536 426,805 ------------ $ 16,028,673 - ---------------------------------------------------------------------------------------------------------------- U.S. Treasury Obligations - 4.9% - ---------------------------------------------------------------------------------------------------------------- U.S. Treasury Bonds, 9.25%, 2016 (l) $ 576,000 $ 765,225 U.S. Treasury Bonds, 6.75%, 2026 (l) 1,372,000 1,687,024 U.S. Treasury Notes, 5.5%, 2008 (l) 173,000 173,973 U.S. Treasury Notes, 6.5%, 2010 (l) 53,000 55,795 U.S. Treasury Notes, 5.125%, 2011 (f)(l) 4,199,000 4,333,171 U.S. Treasury Notes, 4%, 2014 (l) 304,000 298,205 U.S. Treasury Notes, 5.125%, 2016 (l) 6,789,000 7,079,651 U.S. Treasury Notes, TIPS, 2.375%, 2017 (l) 288,235 287,875 ------------ $ 14,680,919 - ---------------------------------------------------------------------------------------------------------------- Utilities - Electric Power - 1.3% - ---------------------------------------------------------------------------------------------------------------- AES Corp., 9.375%, 2010 $ 30,000 $ 31,350 Edison Mission Energy, 7%, 2017 (n) 980,000 926,100 Intergen N.V., 9%, 2017 (n) 155,000 157,325 ISA Capital do Brasil S.A., 8.8%, 2017 600,000 616,500 Mirant Americas Generation LLC, 8.3%, 2011 600,000 592,500 Mirant North American LLC, 7.375%, 2013 135,000 134,325 NRG Energy, Inc., 7.375%, 2016 840,000 829,500 Reliant Energy, Inc., 7.875%, 2017 585,000 571,838 ------------ $ 3,859,438 - ---------------------------------------------------------------------------------------------------------------- TOTAL BONDS (IDENTIFIED COST, $167,993,793) $163,973,290 - ---------------------------------------------------------------------------------------------------------------- Common Stocks - 40.1% - ---------------------------------------------------------------------------------------------------------------- Aerospace - 1.1% - ---------------------------------------------------------------------------------------------------------------- Lockheed Martin Corp. 16,580 $ 1,643,741 Northrop Grumman Corp. 22,166 1,747,567 ------------ $ 3,391,308 - ---------------------------------------------------------------------------------------------------------------- Automotive - 0.6% - ---------------------------------------------------------------------------------------------------------------- Autoliv, Inc. 17,090 $ 980,453 General Motors Corp. 21,100 648,614 ------------ $ 1,629,067 - ---------------------------------------------------------------------------------------------------------------- Biotechnology - 0.1% - ---------------------------------------------------------------------------------------------------------------- Amgen, Inc. (a) 5,850 $ 293,144 - ---------------------------------------------------------------------------------------------------------------- Broadcasting - 0.4% - ---------------------------------------------------------------------------------------------------------------- CBS Corp., "B" 16,030 $ 505,105 News Corp., "A" 9,380 189,757 Walt Disney Co. 18,329 615,854 ------------ $ 1,310,716 - ---------------------------------------------------------------------------------------------------------------- Brokerage & Asset Managers - 1.3% - ---------------------------------------------------------------------------------------------------------------- Goldman Sachs Group, Inc. 5,350 $ 941,654 Lehman Brothers Holdings, Inc. 16,492 904,256 Merrill Lynch & Co., Inc. 5,860 431,882 Morgan Stanley 24,720 1,541,786 ------------ $ 3,819,578 - ---------------------------------------------------------------------------------------------------------------- Chemicals - 0.5% - ---------------------------------------------------------------------------------------------------------------- Dow Chemical Co. 20,764 $ 885,169 PPG Industries, Inc. 6,800 498,780 ------------ $ 1,383,949 - ---------------------------------------------------------------------------------------------------------------- Computer Software - 0.1% - ---------------------------------------------------------------------------------------------------------------- McAfee, Inc. (a) 5,073 $ 181,360 - ---------------------------------------------------------------------------------------------------------------- Computer Software - Systems - 0.6% - ---------------------------------------------------------------------------------------------------------------- Hewlett-Packard Co. 18,210 $ 898,664 International Business Machines Corp. 6,780 791,158 ------------ $ 1,689,822 - ---------------------------------------------------------------------------------------------------------------- Construction - 0.1% - ---------------------------------------------------------------------------------------------------------------- D.R. Horton, Inc. 24,800 $ 374,728 - ---------------------------------------------------------------------------------------------------------------- Consumer Goods & Services - 0.1% - ---------------------------------------------------------------------------------------------------------------- Kimberly-Clark Corp. 2,583 $ 177,426 - ---------------------------------------------------------------------------------------------------------------- Electrical Equipment - 0.3% - ---------------------------------------------------------------------------------------------------------------- General Electric Co. 18,390 $ 714,819 Rockwell Automation, Inc. 2,667 187,917 ------------ $ 902,736 - ---------------------------------------------------------------------------------------------------------------- Electronics - 0.3% - ---------------------------------------------------------------------------------------------------------------- Amkor Technology, Inc. (a) 42,390 $ 488,333 Intel Corp. 18,350 472,513 ------------ $ 960,846 - ---------------------------------------------------------------------------------------------------------------- Energy - Integrated - 3.1% - ---------------------------------------------------------------------------------------------------------------- Chevron Corp. 39,010 $ 3,423,518 ConocoPhillips 2,650 217,009 Exxon Mobil Corp. 52,520 4,502,540 Hess Corp. 19,900 1,221,263 ------------ $ 9,364,330 - ---------------------------------------------------------------------------------------------------------------- Food & Beverages - 0.2% - ---------------------------------------------------------------------------------------------------------------- General Mills, Inc. 12,467 $ 696,656 - ---------------------------------------------------------------------------------------------------------------- Food & Drug Stores - 0.2% - ---------------------------------------------------------------------------------------------------------------- Kroger Co. 21,750 $ 578,115 - ---------------------------------------------------------------------------------------------------------------- Gaming & Lodging - 0.3% - ---------------------------------------------------------------------------------------------------------------- Hilton Hotels Corp. 8,602 $ 395,262 Penn National Gaming, Inc. (a) 3,930 231,084 Royal Caribbean Cruises Ltd. 8,390 319,072 ------------ $ 945,418 - ---------------------------------------------------------------------------------------------------------------- General Merchandise - 0.7% - ---------------------------------------------------------------------------------------------------------------- Family Dollar Stores, Inc. 14,730 $ 431,294 Macy's, Inc. 29,205 926,383 Wal-Mart Stores, Inc. 15,200 663,176 ------------ $ 2,020,853 - ---------------------------------------------------------------------------------------------------------------- Health Maintenance Organizations - 0.4% - ---------------------------------------------------------------------------------------------------------------- Humana, Inc. (a) 15,980 $ 1,024,158 - ---------------------------------------------------------------------------------------------------------------- Insurance - 2.1% - ---------------------------------------------------------------------------------------------------------------- Ace Ltd. 21,867 $ 1,263,038 Allstate Corp. 9,920 543,120 Endurance Specialty Holdings Ltd. 5,820 232,043 Hartford Financial Services Group, Inc. 7,140 634,817 IPC Holdings Ltd. 18,330 465,949 MetLife, Inc. 22,540 1,443,687 Travelers Cos., Inc. 35,870 1,812,870 ------------ $ 6,395,524 - ---------------------------------------------------------------------------------------------------------------- Machinery & Tools - 0.9% - ---------------------------------------------------------------------------------------------------------------- Commercial Metals Co. 15,030 $ 434,217 Eaton Corp. 6,420 604,892 Timken Co. 47,509 1,689,420 ------------ $ 2,728,529 - ---------------------------------------------------------------------------------------------------------------- Major Banks - 2.7% - ---------------------------------------------------------------------------------------------------------------- Bank of America Corp. 76,321 $ 3,867,948 JPMorgan Chase & Co. 64,730 2,881,780 PNC Financial Services Group, Inc. 9,990 702,996 Regions Financial Corp. 21,759 681,057 ------------ $ 8,133,781 - ---------------------------------------------------------------------------------------------------------------- Medical & Health Technology & Services - 0.3% - ---------------------------------------------------------------------------------------------------------------- Tenet Healthcare Corp. 243,909 $ 826,852 - ---------------------------------------------------------------------------------------------------------------- Metals & Mining - 0.4% - ---------------------------------------------------------------------------------------------------------------- Nucor Corp. 8,310 $ 439,599 Southern Copper Corp. (l) 6,970 733,593 ------------ $ 1,173,192 - ---------------------------------------------------------------------------------------------------------------- Natural Gas - Pipeline - 0.1% - ---------------------------------------------------------------------------------------------------------------- Williams Cos., Inc. 6,010 $ 186,310 - ---------------------------------------------------------------------------------------------------------------- Other Banks & Diversified Financials - 1.8% - ---------------------------------------------------------------------------------------------------------------- Citigroup, Inc. 66,813 $ 3,132,193 Countrywide Financial Corp. (l) 40,099 795,965 Fannie Mae 12,320 808,315 New York Community Bancorp, Inc. 34,320 607,121 ------------ $ 5,343,594 - ---------------------------------------------------------------------------------------------------------------- Pharmaceuticals - 1.7% - ---------------------------------------------------------------------------------------------------------------- Bristol-Myers Squibb Co. 8,260 $ 240,779 Eli Lilly & Co. 3,182 182,488 Johnson & Johnson 22,280 1,376,681 Merck & Co., Inc. 27,613 1,385,344 Pfizer, Inc. 64,890 1,611,868 Wyeth 7,980 369,474 ------------ $ 5,166,634 - ---------------------------------------------------------------------------------------------------------------- Printing & Publishing - 0.1% - ---------------------------------------------------------------------------------------------------------------- Deluxe Corp. 10,520 $ 399,970 - ---------------------------------------------------------------------------------------------------------------- Railroad & Shipping - 0.3% - ---------------------------------------------------------------------------------------------------------------- Frontline Ltd. (l) 17,840 $ 833,485 - ---------------------------------------------------------------------------------------------------------------- Real Estate - 15.1% - ---------------------------------------------------------------------------------------------------------------- Alexandria Real Estate Equities, Inc., REIT 20,156 $ 1,881,159 AvalonBay Communities, Inc., REIT 12,660 1,448,051 BRE Properties, Inc., REIT (l) 30,105 1,672,032 Developers Diversified Realty Corp., REIT 29,788 1,593,062 Douglas Emmett, Inc., REIT (l) 14,327 350,295 EastGroup Properties, Inc., REIT 30,937 1,312,657 Equity Residential, REIT 28,643 1,152,594 General Growth Properties, Inc., REIT 31,415 1,561,640 GMH Communities Trust, REIT 173,057 1,360,228 Health Care Property Investors, Inc., REIT 40,994 1,247,037 Highwoods Properties, Inc., REIT (l) 49,985 1,783,965 Host Hotels & Resorts, Inc., REIT 66,216 1,475,955 Kimco Realty Corp., REIT 44,196 1,892,473 Lexington Corporate Properties Trust, REIT 104,196 2,154,773 Macerich Co., REIT 27,765 2,255,073 Medical Properties Trust, Inc., REIT (l) 110,821 1,492,759 Nationwide Health Properties, Inc., REIT 37,330 1,035,908 Pennsylvania Real Estate Investment Trust, REIT (l) 61,217 2,315,839 Plum Creek Timber Co., Inc., REIT 50,985 2,137,801 ProLogis, REIT 37,826 2,275,612 Public Storage, Inc., REIT 16,445 1,246,202 Regency Centers Corp., REIT 19,774 1,373,700 Simon Property Group, Inc., REIT 33,955 3,223,009 SL Green Realty Corp., REIT 19,279 2,149,801 Ventas, Inc., REIT 67,360 2,565,069 Vornado Realty Trust, REIT 20,896 2,227,305 ------------ $ 45,183,999 - ---------------------------------------------------------------------------------------------------------------- Specialty Stores - 0.2% - ---------------------------------------------------------------------------------------------------------------- RadioShack Corp. 27,590 $ 655,814 - ---------------------------------------------------------------------------------------------------------------- Telephone Services - 1.7% - ---------------------------------------------------------------------------------------------------------------- AT&T, Inc. 23,260 $ 927,376 Citizens Communications Co. 32,550 472,301 Embarq Corp. 26,719 1,667,800 Qwest Communications International, Inc. (a) 91,670 820,447 Verizon Communications, Inc. 30,960 1,296,605 ------------ $ 5,184,529 - ---------------------------------------------------------------------------------------------------------------- Tobacco - 0.8% - ---------------------------------------------------------------------------------------------------------------- Altria Group, Inc. 26,810 $ 1,860,882 Reynolds American, Inc. (l) 9,368 619,412 ------------ $ 2,480,294 - ---------------------------------------------------------------------------------------------------------------- Utilities - Electric Power - 1.5% - ---------------------------------------------------------------------------------------------------------------- Duke Energy Corp. 23,680 $ 434,291 Edison International 19,170 1,010,451 FirstEnergy Corp. 22,240 1,366,426 FPL Group, Inc. 5,610 330,092 NRG Energy, Inc. (a) 36,630 1,395,237 ------------ $ 4,536,497 - ---------------------------------------------------------------------------------------------------------------- TOTAL COMMON STOCKS (IDENTIFIED COST, $122,303,840) $119,973,214 - ---------------------------------------------------------------------------------------------------------------- Floating Rate Loans - 1.9% (g)(r) - ---------------------------------------------------------------------------------------------------------------- Automotive - 0.4% - ---------------------------------------------------------------------------------------------------------------- Ford Motor Co., Term Loan B, 8.36%, 2031 $ 927,335 $ 869,183 Goodyear Tire & Rubber, Second Lien Term Loan, 6.85%, 2014 195,011 183,880 Mark IV Industries, Inc., Second Lien Term Loan, 11.1%, 2011 300,597 281,559 ------------ $ 1,334,622 - ---------------------------------------------------------------------------------------------------------------- Broadcasting - 0.2% - ---------------------------------------------------------------------------------------------------------------- Gray Television, Inc., Term Loan B, 6.86%, 2014 $ 142,139 $ 133,167 Univison Communications, Inc., Term Loan B, 2014 (o) 25,497 23,534 Univison Communications, Inc., Term Loan B, 7.61%, 2014 396,627 366,087 ------------ $ 522,788 - ---------------------------------------------------------------------------------------------------------------- Building - 0.0% - ---------------------------------------------------------------------------------------------------------------- Building Materials Corp. Second Lien Term Loan, 2014 (o) $ 61,841 $ 50,826 - ---------------------------------------------------------------------------------------------------------------- Cable TV - 0.1% - ---------------------------------------------------------------------------------------------------------------- Charter Communications, Inc., Term Loan, 7.36%, 2013 $ 156,102 $ 147,435 CSC Holdings, Inc., Term Loan B, 7.07%, 2013 199,273 190,929 MCC Iowa LLC Mediacom, Term Loan A, 7.05%, 2012 181,685 168,740 ------------ $ 507,104 - ---------------------------------------------------------------------------------------------------------------- Chemicals - 0.1% - ---------------------------------------------------------------------------------------------------------------- Celanese AG, Term Loan, 7.11%, 2014 $ 329,459 $ 317,653 - ---------------------------------------------------------------------------------------------------------------- Consumer Goods & Services - 0.0% - ---------------------------------------------------------------------------------------------------------------- Jarden Corp., Term Loan B, 2008 (o) $ 83,108 $ 79,618 - ---------------------------------------------------------------------------------------------------------------- Food & Beverages - 0.2% - ---------------------------------------------------------------------------------------------------------------- Dean Foods, Term Loan B, 6.86%, 2014 $ 592,550 $ 573,384 - ---------------------------------------------------------------------------------------------------------------- Forest & Paper Products - 0.1% - ---------------------------------------------------------------------------------------------------------------- Georgia-Pacific Corp., Term Loan, 7.12%, 2012 $ 157,141 $ 150,159 Georgia-Pacific Corp., Term Loan B-2, 7.11%, 2012 19,603 18,732 ------------ $ 168,891 - ---------------------------------------------------------------------------------------------------------------- Medical & Health Technology & Services - 0.3% - ---------------------------------------------------------------------------------------------------------------- Community Health Systems, Term Loan, 7.76%, 2014 $ 200,576 $ 192,446 Community Health Systems, Term Loan B, 2014 (o) 13,228 12,692 HCA, Inc., Term Loan B, 7.61%, 2013 626,412 602,642 ------------ $ 807,780 - ---------------------------------------------------------------------------------------------------------------- Natural Gas - Pipeline - 0.1% - ---------------------------------------------------------------------------------------------------------------- Kinder Morgan, Inc., Term Loan B, 7.07%, 2014 $ 211,417 $ 200,582 - ---------------------------------------------------------------------------------------------------------------- Pollution Control - 0.1% - ---------------------------------------------------------------------------------------------------------------- Allied Waste North America, Inc., Letter of Credit, 5.32%, 2012 $ 106,575 $ 103,431 Allied Waste North America, Inc., Term Loan B, 6.84%, 2012 202,575 196,599 ------------ $ 300,030 - ---------------------------------------------------------------------------------------------------------------- Printing & Publishing - 0.2% - ---------------------------------------------------------------------------------------------------------------- Idearc, Inc., Term Loan B, 7.36%, 2014 $ 680,356 $ 656,544 - ---------------------------------------------------------------------------------------------------------------- Specialty Stores - 0.1% - ---------------------------------------------------------------------------------------------------------------- Michaels Stores, Term Loan B, 7.63%, 2013 $ 285,409 $ 268,427 - ---------------------------------------------------------------------------------------------------------------- TOTAL FLOATING RATE LOANS (IDENTIFIED COST, $6,046,050) $ 5,788,249 - ---------------------------------------------------------------------------------------------------------------- Money Market Funds (v) - 2.5% - ---------------------------------------------------------------------------------------------------------------- MFS Institutional Money Market Portfolio, 5.296% (Identified Cost, $7,413,316) 7,413,316 $ 7,413,316 - ---------------------------------------------------------------------------------------------------------------- Collateral for Securities Loaned - 9.9% - ---------------------------------------------------------------------------------------------------------------- Citigroup Global Markets, Inc. Repurchase Agreement, 5.3%, dated 8/31/07, due 9/04/07, total to be received $29,542,530 (secured by U.S. Treasury and Federal Agency obligations and Mortgage Backed securities in a jointly traded account), at Cost 29,525,143 $ 29,525,143 - ---------------------------------------------------------------------------------------------------------------- TOTAL INVESTMENTS (IDENTIFIED COST, $333,282,142) (k) $326,673,212 - ---------------------------------------------------------------------------------------------------------------- Other Assets, Less Liabilities - (9.1)% (27,256,443) - ---------------------------------------------------------------------------------------------------------------- NET ASSETS - 100.0% $299,416,769 - ---------------------------------------------------------------------------------------------------------------- (a) Non-income producing security. (f) All or a portion of the security has been segregated as collateral for an open futures contract. (g) The rate shown represents a weighted average coupon rate on settled positions at period end. (k) As of August 31, 2007, the fund held securities fair valued in accordance with the policies adopted by the Board of Trustees, aggregating $160,980,650 and 49.28% of market value. An independent pricing service provided an evaluated bid for 46.18% of the market value. (l) All or a portion of this security is on loan. (n) Securities exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be sold in the ordinary course of business in transactions exempt from registration, normally to qualified institutional buyers. At period end, the aggregate value of these securities was $20,098,993, representing 6.7% of net assets. (o) All or a portion of this position has not settled. Upon settlement date, interest rates will be determined. (p) Payment-in-kind security. (r) Remaining maturities of floating rate loans may be less than stated maturities shown as a result of contractual or optional prepayments by the borrower. Such prepayments cannot be predicted with certainty. These loans may be subject to restrictions on resale. Floating rate loans generally have rates of interest which are determined periodically by reference to a base lending rate plus a premium. (v) Affiliated fund that is available only to investment companies managed by MFS. The rate quoted is the annualized seven-day yield of the fund at period end. The following abbreviations are used in this report and are defined: CLN Credit-Linked Note. FRN Floating Rate Note. Interest rate resets periodically and may not be the rate reported at period end. REIT Real Estate Investment Trust TIPS Treasury Inflation Protected Security FUTURES CONTRACTS OUTSTANDING AT 8/31/07 UNREALIZED EXPIRATION APPRECIATION DESCRIPTION CONTRACTS VALUE DATE (DEPRECIATION) U.S. Treasury Note 10 yr (Short) 24 $2,617,125 Dec-07 $(12,646) At August 31, 2007, the fund had sufficient cash and/or other liquid securities to cover any commitments under these derivative contracts. SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENT OF ASSETS AND LIABILITIES At 8/31/07 (unaudited) This statement represents your fund's balance sheet, which details the assets and liabilities comprising the total value of the fund. ASSETS - ------------------------------------------------------------------------------------------------------ Investments, at value, including $44,209,299 of securities on loan (identified cost, $333,282,142) $326,673,212 Receivable for daily variation margin on open futures contracts 9,375 Receivable for investments sold 266,081 Receivable for fund shares sold 1,773,347 Interest and dividends receivable 3,039,379 Receivable from investment adviser 109,315 Other assets 721 - ------------------------------------------------------------------------------------------------------ Total assets $331,871,430 - ------------------------------------------------------------------------------------------------------ LIABILITIES - ------------------------------------------------------------------------------------------------------ Payable to custodian $21,851 Distributions payable 1,075,612 Payable for investments purchased 665,728 Payable for fund shares reacquired 1,107,362 Collateral for securities loaned, at value (c) 29,525,143 Payable to affiliates Management fee 10,593 Shareholder servicing costs 11,016 Distribution and service fees 8,380 Administrative services fee 300 Payable for independent trustees' compensation 263 Accrued expenses and other liabilities 28,413 - ------------------------------------------------------------------------------------------------------ Total liabilities $32,454,661 - ------------------------------------------------------------------------------------------------------ Net assets $299,416,769 - ------------------------------------------------------------------------------------------------------ NET ASSETS CONSIST OF - ------------------------------------------------------------------------------------------------------ Paid-in capital $304,192,219 Unrealized appreciation (depreciation) on investments (6,621,576) Accumulated net realized gain (loss) on investments 1,811,264 Undistributed net investment income 34,862 - ------------------------------------------------------------------------------------------------------ Net assets $299,416,769 - ------------------------------------------------------------------------------------------------------ Shares of beneficial interest outstanding 28,403,046 - ------------------------------------------------------------------------------------------------------ Statement of Assets and Liabilities (unaudited) - continued Class A shares - ------------------------------------------------------------------------------------------------------ Net assets $204,750,454 Shares outstanding 19,417,553 - ------------------------------------------------------------------------------------------------------ Net asset value per share $10.54 - ------------------------------------------------------------------------------------------------------ Offering price per share (100/95.25Xnet asset value per share) $11.07 - ------------------------------------------------------------------------------------------------------ Class C shares - ------------------------------------------------------------------------------------------------------ Net assets $92,583,861 Shares outstanding 8,788,024 - ------------------------------------------------------------------------------------------------------ Net asset value and offering price per share $10.54 - ------------------------------------------------------------------------------------------------------ Class I shares - ------------------------------------------------------------------------------------------------------ Net assets $2,082,454 Shares outstanding 197,469 - ------------------------------------------------------------------------------------------------------ Net asset value, offering price, and redemption price per share $10.55 - ------------------------------------------------------------------------------------------------------ On sales of $50,000 or more, the offering price of Class A shares is reduced. A contingent deferred sales charge may be imposed on redemptions of Class A and Class C shares. (c) Non-cash collateral not included. SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENT OF OPERATIONS Six months ended 8/31/07 (unaudited) This statement describes how much your fund earned in investment income and accrued in expenses. It also describes any gains and/or losses generated by fund operations. NET INVESTMENT INCOME - ------------------------------------------------------------------------------------------------------- Income Interest $5,548,053 Dividends 1,926,540 Foreign taxes withheld (3,936) - ------------------------------------------------------------------------------------------------------- Total investment income $7,470,657 - ------------------------------------------------------------------------------------------------------- Expenses Management fee $909,611 Distribution and service fees 708,381 Shareholder servicing costs 102,006 Administrative services fee 28,388 Independent trustees' compensation 2,755 Custodian fee 28,302 Shareholder communications 19,968 Auditing fees 25,781 Legal fees 2,402 Miscellaneous 46,584 - ------------------------------------------------------------------------------------------------------- Total expenses $1,874,178 - ------------------------------------------------------------------------------------------------------- Fees paid indirectly (139) Reduction of expenses by investment adviser (261,006) - ------------------------------------------------------------------------------------------------------- Net expenses $1,613,033 - ------------------------------------------------------------------------------------------------------- Net investment income $5,857,624 - ------------------------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS - ------------------------------------------------------------------------------------------------------- Realized gain (loss) (identified cost basis) Investment transactions $1,982,213 Futures contracts (29,418) - ------------------------------------------------------------------------------------------------------- Net realized gain (loss) on investments $1,952,795 - ------------------------------------------------------------------------------------------------------- Change in unrealized appreciation (depreciation) Investments $(12,984,479) Futures contracts (12,646) - ------------------------------------------------------------------------------------------------------- Net unrealized gain (loss) on investments $(12,997,125) - ------------------------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) on investments $(11,044,330) - ------------------------------------------------------------------------------------------------------- Change in net assets from operations $(5,186,706) - ------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENTS OF CHANGES IN NET ASSETS These statements describe the increases and/or decreases in net assets resulting from operations, any distributions, and any shareholder transactions. SIX MONTHS ENDED PERIOD ENDED 8/31/07 2/28/07(c) (UNAUDITED) CHANGE IN NET ASSETS FROM OPERATIONS - ------------------------------------------------------------------------------------------------------ Net investment income $5,857,624 $2,909,418 Net realized gain (loss) on investments 1,952,795 853,945 Net unrealized gain (loss) on investments (12,997,125) 6,375,549 - ------------------------------------------------------------------------------------------------------ Change in net assets from operations $(5,186,706) $10,138,912 - ------------------------------------------------------------------------------------------------------ DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ------------------------------------------------------------------------------------------------------ From net investment income Class A $(4,250,910) $(2,272,559) Class C (1,532,500) (653,322) Class I (56,806) (72,756) From net realized gain on investments Class A (561,842) (29,122) Class C (241,389) (10,423) Class I (7,204) (541) - ------------------------------------------------------------------------------------------------------ Total distributions declared to shareholders $(6,650,651) $(3,038,723) - ------------------------------------------------------------------------------------------------------ Change in net assets from fund share transactions $88,031,839 $216,122,098 - ------------------------------------------------------------------------------------------------------ Total change in net assets $76,194,482 $223,222,287 - ------------------------------------------------------------------------------------------------------ NET ASSETS - ------------------------------------------------------------------------------------------------------ At beginning of period 223,222,287 -- At end of period (including undistributed net investment income of $34,862 and $17,454, respectively) $299,416,769 $223,222,287 - ------------------------------------------------------------------------------------------------------ (c) For the period from the commencement of the fund's investment operations, May 26, 2006, through the stated period end. SEE NOTES TO FINANCIAL STATEMENTS Financial Statements FINANCIAL HIGHLIGHTS The financial highlights table is intended to help you understand the fund's financial performance for the semiannual period and the past 5 fiscal years (or life of a particular share class, if shorter). Certain information reflects financial results for a single fund share. The total returns in the table represent the rate by which an investor would have earned (or lost) on an investment in the fund share class (assuming reinvestment of all distributions) held for the entire period. SIX MONTHS ENDED PERIOD ENDED CLASS A 8/31/07 2/28/07(c) (UNAUDITED) Net asset value, beginning of period $10.95 $10.00 - ---------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ---------------------------------------------------------------------------------------------------------- Net investment income (d) $0.24 $0.37 Net realized and unrealized gain (loss) on investments (0.38) 0.93 - ---------------------------------------------------------------------------------------------------------- Total from investment operations $(0.14) $1.30 - ---------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ---------------------------------------------------------------------------------------------------------- From net investment income $(0.24) $(0.35) From net realized gain on investments and foreign currency transactions (0.03) (0.00)(w) - ---------------------------------------------------------------------------------------------------------- Total distributions declared to shareholders $(0.27) $(0.35) - ---------------------------------------------------------------------------------------------------------- Net asset value, end of period $10.54 $10.95 - ---------------------------------------------------------------------------------------------------------- Total return (%) (r)(s)(t) (1.31)(n) 13.20(n) - ---------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ---------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.13(a) 1.36(a) Expenses after expense reductions (f) 0.95(a) 0.95(a) Net investment income 4.39(a) 4.45(a) Portfolio turnover 35 46 Net assets at end of period (000 Omitted) $204,750 $156,447 - ---------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS ENDED PERIOD ENDED CLASS C 8/31/07 2/28/07(c) (UNAUDITED) Net asset value, beginning of period $10.94 $10.00 - ---------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ---------------------------------------------------------------------------------------------------------- Net investment income (d) $0.20 $0.30 Net realized and unrealized gain (loss) on investments (0.37) 0.93 - ---------------------------------------------------------------------------------------------------------- Total from investment operations $(0.17) $1.23 - ---------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ---------------------------------------------------------------------------------------------------------- From net investment income $(0.20) $(0.29) From net realized gain on investments and foreign currency transactions (0.03) (0.00)(w) - ---------------------------------------------------------------------------------------------------------- Total distributions declared to shareholders $(0.23) $(0.29) - ---------------------------------------------------------------------------------------------------------- Net asset value, end of period $10.54 $10.94 - ---------------------------------------------------------------------------------------------------------- Total return (%) (r)(s)(t) (1.57)(n) 12.51(n) - ---------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ---------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.83(a) 2.01(a) Expenses after expense reductions (f) 1.65(a) 1.65(a) Net investment income 3.69(a) 3.67(a) Portfolio turnover 35 46 Net assets at end of period (000 Omitted) $92,584 $64,316 - ---------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS ENDED PERIOD ENDED CLASS I 8/31/07 2/28/07(c) (UNAUDITED) Net asset value, beginning of period $10.95 $10.00 - ---------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ---------------------------------------------------------------------------------------------------------- Net investment income (d) $0.26 $0.41 Net realized and unrealized gain (loss) on investments (0.37) 0.91 - ---------------------------------------------------------------------------------------------------------- Total from investment operations $(0.11) $1.32 - ---------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ---------------------------------------------------------------------------------------------------------- From net investment income $(0.26) $(0.37) From net realized gain on investments and foreign currency transactions (0.03) (0.00)(w) - ---------------------------------------------------------------------------------------------------------- Total distributions declared to shareholders $(0.29) $(0.37) - ---------------------------------------------------------------------------------------------------------- Net asset value, end of period $10.55 $10.95 - ---------------------------------------------------------------------------------------------------------- Total return (%) (r)(s) (1.07)(n) 13.45(n) - ---------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ---------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 0.83(a) 1.29(a) Expenses after expense reductions (f) 0.65(a) 0.65(a) Net investment income 4.70(a) 4.84(a) Portfolio turnover 35 46 Net assets at end of period (000 Omitted) $2,082 $2,459 - ---------------------------------------------------------------------------------------------------------- (a) Annualized. (c) For the period from the commencement of the fund's investment operations, May 26, 2006, through the stated period end. (d) Per share data are based on average shares outstanding. (f) Ratios do not reflect reductions from fees paid indirectly. (n) Not annualized. (r) Certain expenses have been reduced without which performance would have been lower. (s) From time to time the fund may receive proceeds from litigation settlements, without which performance would be lower. (t) Total returns do not include any applicable sales charges. (w) Per share amount was less than $0.01. SEE NOTES TO FINANCIAL STATEMENTS NOTES TO FINANCIAL STATEMENTS (unaudited) (1) BUSINESS AND ORGANIZATION MFS Diversified Income Fund (the fund) is a series of MFS Series Trust XIII (the trust). The trust is organized as a Massachusetts business trust and is registered under the Investment Company Act of 1940, as amended, as an open- end management investment company. (2) SIGNIFICANT ACCOUNTING POLICIES GENERAL - The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The fund can invest in foreign securities, including securities of emerging market issuers. Investments in foreign securities are vulnerable to the effects of changes in the relative values of the local currency and the U.S. dollar and to the effects of changes in each country's legal, political, and economic environment. The markets of emerging markets countries are generally more volatile than the markets of developed countries with more mature economies. All of the risks of investing in foreign securities previously described are heightened when investing in emerging markets countries. INVESTMENT VALUATIONS - Equity securities, including restricted equity securities, are generally valued at the last sale or official closing price as reported by an independent pricing service on the market or exchange on which they are primarily traded. For securities for which there were no sales reported that day, equity securities are generally valued at the last quoted daily bid quotation as reported by an independent pricing service on the market or exchange on which they are primarily traded. For securities held short for which there were no sales reported for the day, the position is generally valued at the last quoted daily ask quotation as reported by an independent pricing service on the market or exchange on which such securities are primarily traded. Debt instruments (other than short-term instruments), including restricted debt instruments, are generally valued at an evaluated or composite bid as reported by an independent pricing service. Short-term instruments with a maturity at issuance of 60 days or less may be valued at amortized cost, which approximates market value. Futures contracts are generally valued at last posted settlement price as reported by an independent pricing service on the market on which they are primarily traded. Futures contracts for which there were no trades that day for a particular position are generally valued at the closing bid quotation as reported by an independent pricing service on the market on which such futures contracts are primarily traded. Securities and other assets generally valued on the basis of information from an independent pricing service may also be valued at a broker-dealer bid quotation. The values of foreign securities and other assets and liabilities expressed in foreign currencies are converted to U.S. dollars using the mean of bid and asked prices for rates reported by an independent pricing service. The Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund's investments (including any fair valuation) to the adviser pursuant to valuation policies and procedures approved by the Board. If the adviser determines that reliable market quotations are not readily available, investments are valued at fair value as determined in good faith by the adviser in accordance with such procedures under the oversight of the Board of Trustees. Under the fund's valuation policies and procedures, market quotations are not considered to be readily available for many types of debt instruments and certain types of derivatives. These investments are generally valued at fair value based on information from independent pricing services. In addition, investments may be valued at fair value if the adviser determines that an investment's value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund's net asset value, or after the halting of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. Events that occur on a frequent basis after foreign markets close (such as developments in foreign markets and significant movements in the U.S. markets) and prior to the determination of the fund's net asset value may be deemed to have a material affect on the value of securities traded in foreign markets. Accordingly, the fund's foreign equity securities may often be valued at fair value. The adviser may rely on independent pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund's net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of investments used to determine the fund's net asset value may differ from quoted or published prices for the same investments. In September 2006, FASB Statement No. 157, Fair Value Measurements (the "Statement") was issued, and is effective for fiscal years beginning after November 15, 2007 and for all interim periods within those fiscal years. This Statement provides a single definition of fair value, a hierarchy for measuring fair value and expanded disclosures about fair value measurements. Management is evaluating the application of the Statement to the fund, and believes the impact will be limited to expanded disclosures resulting from the adoption of this Statement in the fund's financial statements. REPURCHASE AGREEMENTS - The fund may enter into repurchase agreements with institutions that the fund's investment adviser has determined are creditworthy. Each repurchase agreement is recorded at cost. The fund requires that the securities collateral in a repurchase transaction be transferred to the custodian in a manner sufficient to enable the fund to obtain those securities in the event of a default under the repurchase agreement. The fund monitors, on a daily basis, the value of the collateral to ensure that its value, including accrued interest, is greater than amounts owed to the fund under each such repurchase agreement. INFLATION-ADJUSTED DEBT SECURITIES - The fund invests in inflation-adjusted debt securities issued by the U.S. Treasury. The fund may also invest in inflation-adjusted debt securities issued by U.S. Government agencies and instrumentalities other than the U.S. Treasury and by other entities such as U.S. and foreign corporations and foreign governments. The principal value of these debt securities is adjusted by references to changes in the Consumer Price Index or another general price or wage index. These debt securities typically pay a fixed rate of interest, but this fixed rate is applied to the inflation-adjusted principal amount. The principal paid at maturity of the debt security is typically equal to the inflation-adjusted principal amount, or the security's original par value, whichever is greater. Other types of inflation-adjusted securities may use other methods to adjust for other measures of inflation. DERIVATIVE RISK - The fund may invest in derivatives for hedging or non- hedging purposes. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. When the fund uses derivatives as an investment to gain market exposure, or for hedging purposes, gains and losses from derivative instruments may be substantially greater than the derivative's original cost. Derivative instruments include futures contracts. FUTURES CONTRACTS - The fund may enter into futures contracts for the delayed delivery of securities or currency, or contracts based on financial indices at a fixed price on a future date. In entering such contracts, the fund is required to deposit with the broker either in cash or securities an amount equal to a certain percentage of the contract amount. Subsequent payments are made or received by the fund each day, depending on the daily fluctuations in the value of the contract, and are recorded for financial statement purposes as unrealized gains or losses by the fund. Upon entering into such contracts, the fund bears the risk of interest or exchange rates or securities prices moving unexpectedly, in which case, the fund may not achieve the anticipated benefits of the futures contracts and may realize a loss. SECURITY LOANS - JPMorgan Chase and Co. ("Chase"), as lending agent, may loan the securities of the fund to certain qualified institutions (the "Borrowers") approved by the fund. The loans are collateralized at all times by cash and/or U.S. Treasury securities in an amount at least equal to the market value of the securities loaned. Security lending activity through Chase is further collateralized by an irrevocable standby letter of credit. Chase provides the fund with indemnification against Borrower default. The fund bears the risk of loss with respect to the investment of cash collateral. On loans collateralized by cash, the cash collateral is invested in a money market fund or short-term securities. A portion of the income generated upon investment of the collateral is remitted to the Borrowers, and the remainder is allocated between the fund and the lending agent. On loans collateralized by U.S. Treasury securities, a fee is received from the Borrower, and is allocated between the fund and the lending agents. Net income from securities lending is included in interest income on the Statement of Operations. The dividend and interest income earned on the securities loaned is accounted for in the same manner as other dividend and interest income. At August 31, 2007, the value of securities loaned was $44,209,299. These loans were collateralized by cash of $29,525,143 and U.S. Treasury obligations of $15,537,635. LOANS AND OTHER DIRECT DEBT INSTRUMENTS - The fund may invest in loans and loan participations or other receivables. These investments may include standby financing commitments, including revolving credit facilities, which obligate the fund to supply additional cash to the borrower on demand. Loan participations involve a risk of insolvency of the lending bank or other financial intermediary. INDEMNIFICATIONS - Under the fund's organizational documents, its officers and trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the fund. Additionally, in the normal course of business, the fund enters into agreements with service providers that may contain indemnification clauses. The fund's maximum exposure under these agreements is unknown as this would involve future claims that may be made against the fund that have not yet occurred. INVESTMENT TRANSACTIONS AND INCOME - Investment transactions are recorded on the trade date. Interest income is recorded on the accrual basis. All premium and discount is amortized or accreted for financial statement purposes in accordance with U.S. generally accepted accounting principles. All discount is accreted for tax reporting purposes as required by federal income tax regulations. The fund earns certain fees in connection with its floating rate loan purchasing activities. These fees are in addition to interest payments earned and may include amendment fees, commitment fees, facility fees, consent fees, and prepayment fees. These fees are recorded on an accrual basis as income in the accompanying financial statements. Dividends received in cash are recorded on the ex-dividend date. Certain dividends from foreign securities will be recorded when the fund is informed of the dividend if such information is obtained subsequent to the ex-dividend date. Dividend and interest payments received in additional securities are recorded on the ex-dividend or ex-interest date in an amount equal to the value of the security on such date. Dividends received on REITs that represent a return of capital or capital gain are recorded as a reduction of cost of investments or as a realized gain, respectively. The fund may receive proceeds from litigation settlements. Any proceeds received from litigation involving portfolio holdings are reflected in the Statement of Operations in realized gain/loss if the security has been disposed of by the fund or in unrealized gain/loss if the security is still held by the fund. Any other proceeds from litigation not related to portfolio holdings are reflected as other income in the Statement of Operations. FEES PAID INDIRECTLY - The fund's custody fee is reduced according to an arrangement that measures the value of cash deposited with the custodian by the fund. This amount, for the six months ended August 31, 2007, is shown as a reduction of total expenses on the Statement of Operations. TAX MATTERS AND DISTRIBUTIONS - The fund intends to qualify as a regulated investment company, as defined under Subchapter M of the Internal Revenue Code, and to distribute all of its taxable income, including realized capital gains. Accordingly, no provision for federal income tax is required in the financial statements. Foreign taxes, if any, have been accrued by the fund in the accompanying financial statements. Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from U.S. generally accepted accounting principles. Certain capital accounts in the financial statements are periodically adjusted for permanent differences in order to reflect their tax character. These adjustments have no impact on net assets or net asset value per share. Temporary differences which arise from recognizing certain items of income, expense, gain or loss in different periods for financial statement and tax purposes will reverse at some time in the future. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Book/tax differences primarily relate to amortization and accretion of debt securities. The tax character of distributions made during the current period will be determined at fiscal year end. The tax character of distributions declared to shareholders is as follows: 2/28/07 Ordinary income (including any short-term capital gains) $3,038,723 The federal tax cost and the tax basis components of distributable earnings were as follows: AS OF 8/31/07 Cost of investments $333,322,286 ---------------------------------------------------------- Gross appreciation $5,903,026 Gross depreciation (12,552,100) ---------------------------------------------------------- Net unrealized appreciation (depreciation) $(6,649,074) AS OF 2/28/07 Undistributed ordinary income 1,539,424 Other temporary differences (722,286) Net unrealized appreciation (depreciation) 6,244,769 The aggregate cost above includes prior fiscal year end tax adjustments. MULTIPLE CLASSES OF SHARES OF BENEFICIAL INTEREST - The fund offers multiple classes of shares, which differ in their respective distribution and service fees. All shareholders bear the common expenses of the fund based on the value of settled shares outstanding of each class, without distinction between share classes. Dividends are declared separately for each class. Differences in per share dividend rates are generally due to differences in separate class expenses. (3) TRANSACTIONS WITH AFFILIATES INVESTMENT ADVISER - The fund has an investment advisory agreement with Massachusetts Financial Services Company (MFS) to provide overall investment management and related administrative services and facilities to the fund. The management fee is computed daily and paid monthly at an annual rate of 0.65% of the fund's average daily net assets. The adviser has engaged a sub- adviser for the real estate related component of the fund: Sun Capital Advisers LLC, an affiliate of the adviser, referred to as Sun Capital or the sub-adviser. MFS pays a sub-advisory fee in an amount equal to 0.30% annually of the average daily net asset value of the fund's assets managed by the sub- adviser. The investment adviser has agreed in writing to pay a portion of the fund's operating expenses, exclusive of certain other fees and expenses, such that total annual fund operating expenses do not exceed the following rates annually of the fund's average daily net assets with respect to each class: CLASS A CLASS C CLASS I 0.95% 1.65% 0.65% This written agreement will continue through June 30, 2008 unless changed or rescinded by the fund's Board of Trustees. For the six months ended August 31, 2007, this reduction amounted to $260,347 and is reflected as a reduction of total expenses in the Statement of Operations. DISTRIBUTOR - MFS Fund Distributors, Inc. (MFD), a wholly-owned subsidiary of MFS, as distributor, received $113,972 for the six months ended August 31, 2007, as its portion of the initial sales charge on sales of Class A shares of the fund. The Board of Trustees has adopted a distribution plan for certain class shares pursuant to Rule 12b-1 of the Investment Company Act of 1940. The fund's distribution plan provides that the fund will pay MFD for services provided by MFD and financial intermediaries in connection with the distribution and servicing of certain share classes. One component of the plan is a distribution fee paid to MFD and another component of the plan is a service fee paid to MFD. MFD may subsequently pay all, or a portion, of the distribution and/or service fees to financial intermediaries. Distribution Fee Plan Table: TOTAL ANNUAL DISTRIBUTION DISTRIBUTION SERVICE DISTRIBUTION EFFECTIVE AND SERVICE FEE RATE FEE RATE PLAN (d) RATE (e) FEE Class A 0.10% 0.25% 0.35% 0.30% $290,958 Class C 0.75% 0.25% 1.00% 1.00% 417,423 - --------------------------------------------------------------------------------------------------------------------- Total Distribution and Service Fees $708,381 (d) In accordance with the distribution plan for certain classes, the fund pays distribution and/or service fees up to these annual percentage rates of each class' average daily net assets. (e) The annual effective rates represent actual fees incurred under the distribution plan for the six months ended August 31, 2007 based on each class' average daily net assets. 0.05% of the Class A distribution fee is currently being paid by the fund. Payment of the remaining 0.05% of the Class A distribution fee is not yet in effect and will be implemented on such date as the fund's Board of Trustees may determine. Certain Class A and Class C shares are subject to a contingent deferred sales charge in the event of a shareholder redemption within 12 months of purchase. All contingent deferred sales charges are paid to MFD and during the six months ended August 31, 2007, were as follows: AMOUNT Class A $3,674 Class C 22,816 SHAREHOLDER SERVICING AGENT - MFS Service Center, Inc. (MFSC), a wholly-owned subsidiary of MFS, receives a fee from the fund for its services as shareholder servicing agent calculated as a percentage of the average daily net assets of the fund as determined periodically under the supervision of the fund's Board of Trustees. For the six months ended August 31, 2007, the fee was $66,574, which equated to 0.0476% annually of the fund's average daily net assets. MFSC also receives payment from the fund for out-of-pocket expenses, sub-accounting and other shareholder servicing costs which may be paid to affiliated and unaffiliated service providers. For the six months ended August 31, 2007, these out-of-pocket expenses, sub-accounting and other shareholder servicing costs amounted to $35,432. The fund may also pay shareholder servicing related costs directly to non-related parties. ADMINISTRATOR - MFS provides certain financial, legal, shareholder communications, compliance, and other administrative services to the fund. Under an administrative services agreement, the fund partially reimburses MFS the costs incurred to provide these services. The fund is charged a fixed amount plus a fee based on average daily net assets. The fund's annual fixed amount is $17,500. The administrative services fee incurred for the six months ended August 31, 2007 was equivalent to an annual effective rate of 0.0203% of the fund's average daily net assets. TRUSTEES' AND OFFICERS' COMPENSATION - The fund pays compensation to independent trustees in the form of a retainer, attendance fees, and additional compensation to Board and Committee chairpersons. The fund does not pay compensation directly to trustees or officers of the fund who are also officers of the investment adviser, all of whom receive remuneration for their services to the fund from MFS. Certain officers and trustees of the fund are officers or directors of MFS, MFD, and MFSC. OTHER - This fund and certain other MFS funds (the funds) have entered into a services agreement (the Agreement) which provides for payment of fees by the funds to Tarantino LLC in return for the provision of services of an Independent Chief Compliance Officer (ICCO) for the funds. The ICCO is an officer of the funds and the sole member of Tarantino LLC. The funds can terminate the Agreement with Tarantino LLC at any time under the terms of the Agreement. For the six months ended August 31, 2007, the fee paid to Tarantino LLC was $672. MFS has agreed to reimburse the fund for a portion of the payments made by the funds to Tarantino LLC in the amount of $659, which is shown as a reduction of total expenses in the Statement of Operations. Additionally, MFS has agreed to bear all expenses associated with office space, other administrative support, and supplies provided to the ICCO. (4) PORTFOLIO SECURITIES Purchases and sales of investments, other than purchased option transactions and short-term obligations, were as follows: PURCHASES SALES U.S. government securities $53,265,662 $26,409,737 - ------------------------------------------------------------------------------- Investments (non-U.S. government securities) $128,136,745 $66,039,696 - ------------------------------------------------------------------------------- (5) SHARES OF BENEFICIAL INTEREST The fund's Declaration of Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest. Transactions in fund shares were as follows: SIX MONTHS ENDED PERIOD ENDED 8/31/07 2/28/07(c) SHARES AMOUNT SHARES AMOUNT Shares sold Class A 7,421,441 $81,022,309 15,839,726 $168,001,449 Class C 3,394,764 37,065,047 6,062,654 64,640,226 Class I 33,885 371,565 330,293 3,408,157 - ----------------------------------------------------------------------------------------------------------- 10,850,090 $118,458,921 22,232,673 $236,049,832 Shares issued to shareholders in reinvestment of distributions Class A 332,415 $3,619,410 169,948 $1,832,412 Class C 91,953 1,000,086 35,102 379,283 Class I 5,861 63,918 6,874 73,117 - ----------------------------------------------------------------------------------------------------------- 430,229 $4,683,414 211,924 $2,284,812 Shares reacquired Class A (2,624,490) $(28,176,464) (1,721,487) $(18,641,988) Class C (578,048) (6,209,515) (218,401) (2,353,187) Class I (66,810) (724,517) (112,634) (1,217,371) - ----------------------------------------------------------------------------------------------------------- (3,269,348) $(35,110,496) (2,052,522) $(22,212,546) Net change Class A 5,129,366 $56,465,255 14,288,187 $151,191,873 Class C 2,908,669 31,855,618 5,879,355 62,666,322 Class I (27,064) (289,034) 224,533 2,263,903 - ----------------------------------------------------------------------------------------------------------- 8,010,971 $88,031,839 20,392,075 $216,122,098 (c) For the period from the commencement of the fund's investment operations, May 26, 2006, through the stated period end. (6) LINE OF CREDIT The fund and other funds managed by MFS participate in a $1 billion unsecured committed line of credit provided by a syndication of banks under a credit agreement. In addition, the fund and other funds managed by MFS have established uncommitted borrowing arrangements with certain banks. Borrowings may be made for temporary financing needs. Interest is charged to each fund, based on its borrowings, generally at a rate equal to the Federal Reserve funds rate plus 0.30%. In addition, a commitment fee, based on the average daily, unused portion of the committed line of credit, is allocated among the participating funds at the end of each calendar quarter. For the year six months ended August 31, 2007, the fund's commitment fee and interest expense were $401 and $0, respectively, and are included in miscellaneous expense on the Statement of Operations. BOARD REVIEW OF INVESTMENT ADVISORY AGREEMENT The Investment Company Act of 1940 requires that both the full Board of Trustees and a majority of the non-interested ("independent") Trustees, voting separately, annually approve the continuation of the Fund's investment advisory agreement with MFS and investment sub-advisory agreement among MFS Series Trust XIII, on behalf of the Fund, MFS and Sun Capital Advisers LLC ("Sun Capital") (together, the "Agreements"). The Trustees consider matters bearing on the Fund and its advisory arrangements at their meetings throughout the year, including a review of performance data at each regular meeting. In addition, the independent Trustees met several times over the course of three months beginning in May and ending in July, 2007 ("contract review meetings") for the specific purpose of considering whether to approve the continuation of the investment advisory agreements for the Fund and the other investment companies that the Board oversees (the "MFS Funds"). The independent Trustees were assisted in their evaluation of the Agreements by independent legal counsel, from whom they received separate legal advice and with whom they met separately from MFS and Sun Capital during various contract review meetings. The independent Trustees were also assisted in this process by the MFS Funds' Independent Chief Compliance Officer, a full-time senior officer appointed by and reporting to the independent Trustees. In connection with their deliberations regarding the continuation of the Agreements, the Trustees, including the independent Trustees, considered such information and factors as they believed, in light of the legal advice furnished to them and their own business judgment, to be relevant. The investment advisory agreements for the Fund were considered separately, although the Trustees also took into account the common interests of all MFS Funds in their review. As described below, the Trustees considered the nature, quality, and extent of the various investment advisory, administrative, and shareholder services performed by MFS and Sun Capital, as applicable, under the Agreements and other arrangements with the Fund. In connection with their contract review meetings, the Trustees received and relied upon materials that included, among other items: (i) information provided by Lipper Inc. on the Fund's advisory fees and other expenses and the advisory fees and other expenses of comparable funds identified by Lipper (the "Lipper expense group"), as well as the advisory fees and other expenses of peer funds identified by objective criteria suggested by MFS, (ii) information provided by MFS on the advisory fees of comparable portfolios of other clients of MFS, including institutional separate accounts and other clients, (iii) information as to whether and to what extent applicable expense waivers, reimbursements or fee "breakpoints" are observed for the Fund, (iv) information regarding MFS' financial results and financial condition, including MFS' and certain of its affiliates' estimated profitability from services performed for the Fund and the MFS Funds as a whole, (v) MFS' views regarding the outlook for the mutual fund industry and the strategic business plans of MFS, (vi) descriptions of various functions performed by MFS for the Funds, such as compliance monitoring and portfolio trading practices, (vii) information regarding the overall organization of MFS, including information about MFS' senior management and other personnel providing investment advisory, administrative and other services to the Fund and the other MFS Funds, and (viii) information regarding the overall organization of Sun Capital, including information about Sun Capital personnel providing investment advisory services to the Fund. The comparative fee and expense information prepared and provided by Lipper Inc. was not independently verified and the independent Trustees did not independently verify any information provided to them by MFS or Sun Capital. The Trustees' conclusion as to the continuation of the Agreements was based on a comprehensive consideration of all information provided to the Trustees and not the result of any single factor. Some of the factors that figured particularly in the Trustees' deliberations are described below, although individual Trustees may have evaluated the information presented differently from one another, giving different weights to various factors. The Fund commenced operations on May 26, 2006 and has a limited operating history and performance record. As a result, the Trustees did not receive information provided by Lipper Inc. on the investment performance of the Fund. In the course of their deliberations, the Trustees took into account information provided by MFS in connection with the contract review meetings. After reviewing this information and related factors, the Trustees concluded, within the context of their overall conclusions regarding the investment advisory agreement, that they were satisfied with MFS' efforts relating to investment performance. In assessing the reasonableness of the Fund's advisory fee, the Trustees considered, among other information, the Fund's advisory fee, sub-advisory fee, and the total expense ratio of the Fund's Class A shares as a percentage of average daily net assets and the advisory fee and total expense ratios of peer groups of funds based on information provided by Lipper Inc. and MFS and/ or Sun Capital. The Trustees noted that MFS (and not the Fund) pays Sun Capital its sub-advisory fee from its advisory fees. The Trustees considered that MFS currently observes an expense limitation for the Fund. The Trustees also considered that, according to the Lipper data (which takes into account the expense limitation), the Fund's effective advisory fee and total expense ratio were each lower than the Lipper expense group median. The Trustees also considered the advisory fees charged by MFS to institutional accounts. In comparing these fees, the Trustees considered information provided by MFS as to the generally broader scope of services provided by MFS to the Fund in comparison to institutional accounts, the higher demands placed on MFS' investment personnel and trading infrastructure as a result of the daily cash in-flows and out-flows of the Fund, and the impact on MFS and expenses associated with the more extensive regulatory regime to which the Fund is subject in comparison to institutional accounts. The Trustees also considered whether the Fund is likely to benefit from any economies of scale in the management of the Fund in the event of growth in assets of the Fund. They noted that the Fund's advisory fee rate and sub- advisory fee rate schedules are not currently subject to any breakpoints. Taking into account the expense limitation noted above, the Trustees determined not to recommend any advisory fee or sub-advisory fee breakpoints for the Fund at this time. The Trustees also considered information prepared by MFS and Sun Capital relating to MFS' and Sun Capital's costs and profits with respect to the Fund, and with respect to the MFS Funds considered as a group, and other investment companies and accounts advised by MFS, as well as MFS' methodologies used to determine and allocate its costs to the MFS Funds, the Fund and other accounts and products for purposes of estimating profitability. After reviewing these and other factors described herein, the Trustees concluded, within the context of their overall conclusions regarding the Agreements, that the advisory fee charged to the Fund and the sub-advisory fee paid by MFS to Sun Capital represent reasonable compensation in light of the services being provided by MFS and Sun Capital to the Fund. In addition, the Trustees considered MFS' and Sun Capital's resources and related efforts to continue to retain, attract and motivate capable personnel to serve the Fund. The Trustees also considered current and developing conditions in the financial services industry, including the entry into the industry of large and well-capitalized companies which are spending, and appear to be prepared to continue to spend, substantial sums to engage personnel and to provide services to competing investment companies. In this regard, the Trustees also considered the financial resources of MFS, Sun Capital and their ultimate parent, Sun Life Financial Inc. The Trustees also considered the advantages and possible disadvantages to the Fund of having an adviser and sub-adviser that also serve other investment companies as well as other accounts. The Trustees also considered the nature, quality, cost, and extent of administrative, transfer agency, and distribution services provided to the Fund by MFS and its affiliates under agreements and plans other than the investment advisory agreements, including any 12b-1 fees the Fund pays to MFS Fund Distributors, Inc., an affiliate of MFS and Sun Capital. The Trustees also considered the nature, extent and quality of certain other services MFS performs or arranges for on the Fund's behalf, which may include securities lending programs, directed expense payment programs, class action recovery programs, and MFS' and Sun Capital's interaction with third-party service providers, principally custodians and sub-custodians. The Trustees concluded that the various non-advisory services provided by MFS and its affiliates on behalf of the Fund were satisfactory. The Trustees also considered benefits to MFS and Sun Capital from the use of the Fund's portfolio brokerage commissions, if applicable, to pay for investment research (excluding third-party research, for which MFS pays directly) and various other factors. The Trustees noted that Sun Capital may obtain third-party research with soft dollar commissions. Additionally, the Trustees considered so-called "fall-out benefits" to MFS and Sun Capital such as reputational value derived from serving as an investment manager to the Fund. Based on their evaluation of factors that they deemed to be material, including those factors described above, the Board of Trustees, including a majority of the independent Trustees, concluded that the Fund's investment advisory agreement with MFS and MFS' investment sub-advisory agreement with Sun Capital should be continued for an additional one-year period, commencing August 1, 2007. A discussion regarding the Board's most recent review and renewal of the Fund's investment advisory agreement will be available on or before November 1, 2007 by clicking on the fund's name under "Select a fund" on the MFS Web site (mfs.com). PROXY VOTING POLICIES AND INFORMATION A general description of the MFS funds' proxy voting policies and procedures is available without charge, upon request, by calling 1-800-225-2606, by visiting the Proxy Voting section of mfs.com or by visiting the SEC's Web site at http://www.sec.gov. Information regarding how the fund voted proxies relating to portfolio securities during the most recent twelve-month period ended June 30 is available without charge by visiting the Proxy Voting section of mfs.com or by visiting the SEC's Web site at http://www.sec.gov. QUARTERLY PORTFOLIO DISCLOSURE The fund will file a complete schedule of portfolio holdings with the Securities and Exchange Commission (the Commission) for the first and third quarters of each fiscal year on Form N-Q. The fund's Form N-Q may be reviewed and copied at the: Public Reference Room Securities and Exchange Commission 100 F Street, NE, Room 1580 Washington, D.C. 20549 Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-551-5850. The fund's Form N-Q is available on the EDGAR database on the Commission's Internet Web site at http://www.sec.gov, and copies of this information may be obtained, upon payment of a duplicating fee, by electronic request at the following e-mail address: publicinfo@sec.gov or by writing the Public Reference Section at the above address. A shareholder can also obtain the quarterly portfolio holdings report at mfs.com. CONTACT US WEB SITE MAILING ADDRESS mfs.com MFS Service Center, Inc. P.O. Box 55824 MFS TALK Boston, MA 02205-5824 1-800-637-8255 24 hours a day OVERNIGHT MAIL MFS Service Center, Inc. ACCOUNT SERVICE AND 500 Boylston Street LITERATURE Boston, MA 02116-3741 SHAREHOLDERS 1-800-225-2606 8 a.m. to 8 p.m. ET INVESTMENT PROFESSIONALS 1-800-343-2829 8 a.m. to 8 p.m. ET RETIREMENT PLAN SERVICES 1-800-637-1255 8 a.m. to 8 p.m. ET - ------------------------------------------------------------------------------- Go paperless with eDELIVERY: Arrange to have MFS(R) send prospectuses, reports, and proxies directly to your e-mail inbox. You'll get timely information and less clutter in your mailbox (not to mention help your fund save printing and postage costs). SIGN UP: If your account is registered with us, simply go to mfs.com, log in to your account via MFS(R) Access, and select the eDelivery sign up options. If you own your MFS fund shares through a financial institution or a retirement plan, MFS(R) TALK, MFS Access, and eDelivery may not be available to you. - ------------------------------------------------------------------------------- M F S(R) INVESTMENT MANAGEMENT M F S(R) INVESTMENT MANAGEMENT [graphic omitted] SEMIANNUAL REPORT MFS(R) GOVERNMENT SECURITIES FUND LETTER FROM THE CEO 1 - ------------------------------------------------------------------ PORTFOLIO COMPOSITION 2 - ------------------------------------------------------------------ EXPENSE TABLE 3 - ------------------------------------------------------------------ PORTFOLIO OF INVESTMENTS 5 - ------------------------------------------------------------------ STATEMENT OF ASSETS AND LIABILITIES 10 - ------------------------------------------------------------------ STATEMENT OF OPERATIONS 13 - ------------------------------------------------------------------ STATEMENTS OF CHANGES IN NET ASSETS 14 - ------------------------------------------------------------------ FINANCIAL HIGHLIGHTS 15 - ------------------------------------------------------------------ NOTES TO FINANCIAL STATEMENTS 24 - ------------------------------------------------------------------ BOARD REVIEW OF INVESTMENT ADVISORY AGREEMENT 37 - ------------------------------------------------------------------ PROXY VOTING POLICIES AND INFORMATION 41 - ------------------------------------------------------------------ QUARTERLY PORTFOLIO DISCLOSURE 41 - ------------------------------------------------------------------ CONTACT INFORMATION BACK COVER - ------------------------------------------------------------------ THE REPORT IS PREPARED FOR THE GENERAL INFORMATION OF SHAREHOLDERS. IT IS AUTHORIZED FOR DISTRIBUTION TO PROSPECTIVE INVESTORS ONLY WHEN PRECEDED OR ACCOMPANIED BY A CURRENT PROSPECTUS. - ------------------------------------------------------------------------------ NOT FDIC INSURED o MAY LOSE VALUE o NO BANK OR CREDIT UNION GUARANTEE o NOT A DEPOSIT o NOT INSURED BY ANY FEDERAL GOVERNMENT AGENCY OR NCUA/NCUSIF - ------------------------------------------------------------------------------ 8/31/07 MFG-SEM LETTER FROM THE CEO [Photo of Robert J. Manning] Dear Shareholders: The past year has been a great example of why investors should keep their eyes on the long term. In 2006 the Dow Jones Industrial Average returned 19%. But the Dow's upward rise has not been without hiccups. After hitting new records in July 2007, the Dow lost 8% in the following weeks as a crisis swept global credit markets. As we have said before, markets can be volatile, and investors should make sure they have an investment plan that can carry them through the peaks and troughs. If you are focused on a long-term investment strategy, the short-term ups and downs of the markets should not necessarily dictate portfolio action on your part. Both the bond and stock markets are cyclical. In our view, investors who remain committed to a long-term plan are more likely to achieve their financial goals. We believe you should not let the headlines guide you in your investment decisions and should be cautious about overreacting to short- term volatility. In any market environment, we believe individual investors are best served by following a three-pronged investment strategy of allocating their holdings across the major asset classes, diversifying within each class, and regularly rebalancing their portfolios to maintain their desired allocations. Of course, these strategies cannot guarantee a profit or protect against a loss. Investing and planning for the long term require diligence and patience, two traits that in our experience are essential to capitalizing on the many opportunities the financial markets can offer -- through both up and down economic cycles. Respectfully, /s/ Robert J. Manning Robert J. Manning Chief Executive Officer and Chief Investment Officer MFS Investment Management(R) October 15, 2007 The opinions expressed in this letter are subject to change, may not be relied upon for investment advice, and no forecasts can be guaranteed. PORTFOLIO COMPOSITION PORTFOLIO STRUCTURE (i) Bonds 98.4% Cash & Other Net Assets 1.6% FIXED INCOME SECTORS (i) Mortgage-Backed Securities 49.7% ------------------------------------------------ U.S. Government Agencies 24.7% ------------------------------------------------ U.S. Treasury Securities 22.1% ------------------------------------------------ Municipal Bonds 1.9% ------------------------------------------------ CREDIT QUALITY OF BONDS (r) AAA 100.0% ------------------------------------------------ PORTFOLIO FACTS Average Duration (d,i) 4.5 ------------------------------------------------ Average Life (i,m) 6.3 yrs. ------------------------------------------------ Average Maturity (i,m) 13.5 yrs. ------------------------------------------------ Average Credit Quality of Rated Securities (long-term) (a) AAA ------------------------------------------------ Average Credit Quality of Rated Securities (short-term) (a) A-1 ------------------------------------------------ (a) The average credit quality of rated securities is based upon a market weighted average of portfolio holdings that are rated by public rating agencies. (d) Duration is a measure of how much a bond's price is likely to fluctuate with general changes in interest rates, e.g., if rates rise 1.00%, a bond with a 5-year duration is likely to lose about 5.00% of its value. (i) For purposes of this presentation, the bond component includes both accrued interest amounts and the equivalent exposure from any derivative holdings, if applicable. (m) The average maturity shown is calculated using the final stated maturity on the portfolio's holdings without taking into account any holdings which have been pre-refunded or pre-paid to an earlier date or which have a mandatory put date prior to the stated maturity. The average life shown takes into account these earlier dates. (r) Each security is assigned a rating from Moody's Investors Service. If not rated by Moody's, the rating will be that assigned by Standard & Poor's. Likewise, if not assigned a rating by Standard & Poor's, it will be based on the rating assigned by Fitch, Inc. For those portfolios that hold a security which is not rated by any of the three agencies, the security is considered Not Rated. Holdings in U.S. Treasuries and government agency mortgage-backed securities, if any, are included in the "AAA"-rating category. Percentages are based on the total market value of investments as of 08/31/07. Percentages are based on net assets as of 08/31/07, unless otherwise noted. The portfolio is actively managed and current holdings may be different. EXPENSE TABLE Fund Expenses Borne by the Shareholders During the Period, March 1, 2007 through August 31, 2007 As a shareholder of the fund, you incur two types of costs: (1) transaction costs, including sales charges (loads) on certain purchase or redemption payments, and (2) ongoing costs, including management fees; distribution and service (12b-1) fees; and other fund expenses. This example is intended to help you understand your ongoing costs (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 invested at the beginning of the period and held for the entire period March 1, 2007 through August 31, 2007. ACTUAL EXPENSES The first line for each share class in the following table provides information about actual account values and actual expenses. You may use the information in this line, together with the amount you invested, to estimate the expenses that you paid over the period. Simply divide your account value by $1,000 (for example, an $8,600 account value divided by $1,000 = 8.6), then multiply the result by the number in the first line under the heading entitled "Expenses Paid During Period" to estimate the expenses you paid on your account during this period. HYPOTHETICAL EXAMPLE FOR COMPARISON PURPOSES The second line for each share class in the following table 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 table are meant to highlight your ongoing costs only and do not reflect any transactional costs, such as sales charges (loads). Therefore, the second line for each share class in the table 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 transactional costs were included, your costs would have been higher. - -------------------------------------------------------------------------------- Expenses Beginning Ending Paid During Annualized Account Account Period (p) Share Expense Value Value 3/01/07- Class Ratio 3/01/07 8/31/07 8/31/07 - -------------------------------------------------------------------------------- Actual 0.75% $1,000.00 $1,018.20 $3.80 A ----------------------------------------------------------------------- Hypothetical(h) 0.75% $1,000.00 $1,021.37 $3.81 - -------------------------------------------------------------------------------- Actual 1.50% $1,000.00 $1,014.40 $7.60 B ----------------------------------------------------------------------- Hypothetical(h) 1.50% $1,000.00 $1,017.60 $7.61 - -------------------------------------------------------------------------------- Actual 1.50% $1,000.00 $1,014.40 $7.60 C ----------------------------------------------------------------------- Hypothetical(h) 1.50% $1,000.00 $1,017.60 $7.61 - -------------------------------------------------------------------------------- Actual 0.50% $1,000.00 $1,019.40 $2.54 I ----------------------------------------------------------------------- Hypothetical(h) 0.50% $1,000.00 $1,022.62 $2.54 - -------------------------------------------------------------------------------- Actual 1.00% $1,000.00 $1,016.90 $5.07 R ----------------------------------------------------------------------- Hypothetical(h) 1.00% $1,000.00 $1,020.11 $5.08 - -------------------------------------------------------------------------------- Actual 1.60% $1,000.00 $1,012.80 $8.10 R1 ----------------------------------------------------------------------- Hypothetical(h) 1.60% $1,000.00 $1,017.09 $8.11 - -------------------------------------------------------------------------------- Actual 1.25% $1,000.00 $1,015.60 $6.33 R2 ----------------------------------------------------------------------- Hypothetical(h) 1.25% $1,000.00 $1,018.85 $6.34 - -------------------------------------------------------------------------------- Actual 1.15% $1,000.00 $1,015.10 $5.83 R3 ----------------------------------------------------------------------- Hypothetical(h) 1.15% $1,000.00 $1,019.36 $5.84 - -------------------------------------------------------------------------------- Actual 0.90% $1,000.00 $1,017.40 $4.56 R4 ----------------------------------------------------------------------- Hypothetical(h) 0.90% $1,000.00 $1,020.61 $4.57 - -------------------------------------------------------------------------------- Actual 0.60% $1,000.00 $1,015.70 $3.04 R5 ----------------------------------------------------------------------- Hypothetical(h) 0.60% $1,000.00 $1,022.12 $3.05 - -------------------------------------------------------------------------------- (h) 5% class return per year before expenses. (p) Expenses paid is equal to each class' annualized expense ratio, as shown above, multiplied by the average account value over the period, multiplied by the number of days in the period, divided by the number of days in the year. Expenses paid do not include any applicable sales charges (loads). If these transaction costs had been included, your costs would have been higher. PORTFOLIO OF INVESTMENTS 8/31/07 (unaudited) The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes. Bonds - 95.4% - ---------------------------------------------------------------------------------------------------------------------------------- ISSUER SHARES/PAR VALUE ($) - ---------------------------------------------------------------------------------------------------------------------------------- Agency - Other - 6.8% - ---------------------------------------------------------------------------------------------------------------------------------- Financing Corp., 10.7%, 2017 $ 14,360,000 $ 20,605,673 Financing Corp., 9.4%, 2018 11,750,000 15,753,566 Financing Corp., 9.8%, 2018 14,975,000 20,611,949 Financing Corp., 10.35%, 2018 15,165,000 21,673,894 Financing Corp., STRIPS, 0%, 2017 18,780,000 11,305,203 -------------- $ 89,950,285 - ---------------------------------------------------------------------------------------------------------------------------------- Mortgage Backed - 49.7% - ---------------------------------------------------------------------------------------------------------------------------------- Fannie Mae, 4.35%, 2013 $ 916,510 $ 879,579 Fannie Mae, 4.374%, 2013 2,555,642 2,444,218 Fannie Mae, 4.5%, 2019 49,425,225 47,499,440 Fannie Mae, 4.543%, 2013 1,460,990 1,408,843 Fannie Mae, 4.547%, 2014 3,538,770 3,391,699 Fannie Mae, 4.56%, 2015 2,359,045 2,263,076 Fannie Mae, 4.6%, 2014 1,826,695 1,768,260 Fannie Mae, 4.62%, 2015 3,371,456 3,251,677 Fannie Mae, 4.665%, 2015 1,592,354 1,537,353 Fannie Mae, 4.666%, 2014 8,524,558 8,222,458 Fannie Mae, 4.69%, 2015 1,297,804 1,255,495 Fannie Mae, 4.7%, 2015 1,826,899 1,767,421 Fannie Mae, 4.73%, 2012 2,794,467 2,741,317 Fannie Mae, 4.74%, 2015 1,801,390 1,730,258 Fannie Mae, 4.77%, 2014 1,574,589 1,517,989 Fannie Mae, 4.78%, 2015 1,965,259 1,905,807 Fannie Mae, 4.786%, 2012 826,376 808,404 Fannie Mae, 4.79%, 2012 - 2015 13,280,975 13,063,138 Fannie Mae, 4.81%, 2015 1,691,777 1,643,395 Fannie Mae, 4.815%, 2015 1,968,000 1,896,094 Fannie Mae, 4.82%, 2014 - 2015 6,621,760 6,420,959 Fannie Mae, 4.839%, 2014 9,977,854 9,695,252 Fannie Mae, 4.845%, 2013 3,788,536 3,699,975 Fannie Mae, 4.85%, 2015 1,450,438 1,416,186 Fannie Mae, 4.87%, 2015 1,384,431 1,351,426 Fannie Mae, 4.871%, 2014 5,709,958 5,566,621 Fannie Mae, 4.88%, 2020 1,330,957 1,304,485 Fannie Mae, 4.89%, 2015 1,281,435 1,253,738 Fannie Mae, 4.92%, 2014 1,336,330 1,323,802 Fannie Mae, 4.925%, 2015 5,393,304 5,243,582 Fannie Mae, 4.935%, 2014 793,749 776,128 Fannie Mae, 4.996%, 2017 4,521,185 4,406,302 Fannie Mae, 5%, 2013 - 2027 48,626,967 48,007,820 Fannie Mae, 5.05%, 2017 1,897,000 1,857,706 Fannie Mae, 5.06%, 2013 1,512,994 1,490,136 Fannie Mae, 5.09%, 2016 600,000 589,472 Fannie Mae, 5.1%, 2014 1,985,060 1,969,820 Fannie Mae, 5.3%, 2017 797,645 794,149 Fannie Mae, 5.369%, 2013 1,966,381 1,999,770 Fannie Mae, 5.423%, 2016 2,981,799 2,976,185 Fannie Mae, 5.471%, 2015 2,543,055 2,548,171 Fannie Mae, 5.5%, 2017 - 2035 202,888,051 199,091,874 Fannie Mae, 5.78%, 2008 3,209,313 3,207,041 Fannie Mae, 6%, 2017 - 2037 50,371,402 50,552,359 Fannie Mae, 6.5%, 2016 - 2036 26,992,211 27,514,375 Fannie Mae, 7.5%, 2024 - 2031 667,500 699,187 Freddie Mac, 4%, 2024 2,773,631 2,739,129 Freddie Mac, 4.375%, 2015 7,052,702 6,904,388 Freddie Mac, 4.5%, 2013 - 2021 8,781,615 8,731,873 Freddie Mac, 5%, 2016 - 2027 42,062,452 41,924,902 Freddie Mac, 5.5%, 2024 - 2035 49,493,899 48,551,976 Freddie Mac, 6%, 2017 - 2036 24,419,643 24,509,698 Freddie Mac, 6.5%, 2016 - 2037 13,580,056 13,793,721 Ginnie Mae, 5.5%, 2033 - 2034 25,717,809 25,304,421 -------------- $ 659,212,550 - ---------------------------------------------------------------------------------------------------------------------------------- Municipals - 1.9% - ---------------------------------------------------------------------------------------------------------------------------------- California Educational Facilities Authority Rev. (Stanford University), "T-1", 5%, 2039 $ 12,420,000 $ 13,263,939 Puerto Rico Highway and Transportation Authority Rev., "N", FGIC, 5.25%, 2039 11,485,000 12,521,751 -------------- $ 25,785,690 - ---------------------------------------------------------------------------------------------------------------------------------- U.S. Government Agencies - 17.6% - ---------------------------------------------------------------------------------------------------------------------------------- Aid-Egypt, 4.45%, 2015 $ 7,118,000 $ 6,866,165 Empresa Energetica Cornito Ltd., 6.07%, 2010 5,289,000 5,393,088 Fannie Mae, 3.125%, 2007 25,000,000 24,850,625 Fannie Mae, 4.25%, 2007 30,000,000 29,948,460 Fannie Mae, 4.625%, 2013 3,286,000 3,239,234 Farmer Mac, 5.5%, 2011 (n) 11,110,000 11,371,852 Federal Home Loan Bank, 4.625%, 2008 34,255,000 34,168,472 Federal Home Loan Bank, 5%, 2008 15,000,000 14,993,730 Freddie Mac, 4.875%, 2013 2,121,000 2,117,577 Freddie Mac, 6.625%, 2009 11,515,000 11,932,338 Small Business Administration, 4.34%, 2024 3,802,869 3,613,092 Small Business Administration, 4.72%, 2024 4,502,291 4,365,987 Small Business Administration, 4.76%, 2025 7,670,384 7,417,690 Small Business Administration, 4.77%, 2024 5,322,975 5,187,718 Small Business Administration, 4.86%, 2024 - 2025 8,608,466 8,404,474 Small Business Administration, 4.87%, 2024 5,021,906 4,905,167 Small Business Administration, 4.88%, 2024 3,088,203 3,020,507 Small Business Administration, 4.89%, 2023 6,218,920 6,107,356 Small Business Administration, 4.98%, 2023 2,520,288 2,489,031 Small Business Administration, 4.99%, 2024 4,645,244 4,580,003 Small Business Administration, 5.11%, 2025 4,546,963 4,507,421 Small Business Administration, 5.52%, 2024 3,820,421 3,857,500 Small Business Administration, 6.07%, 2022 3,022,862 3,097,386 Small Business Administration, 6.34%, 2021 3,153,301 3,246,115 Small Business Administration, 6.35%, 2021 2,809,561 2,892,361 Small Business Administration, 6.44%, 2021 2,878,222 2,969,079 Small Business Administration, 6.625%, 2021 3,000,970 3,110,563 Small Business Administration, 8.625%, 2011 107,277 109,596 Small Business Administration, 8.8%, 2011 90,291 91,684 Small Business Administration, 9.05%, 2009 16,523 16,705 Small Business Administration, 9.1%, 2009 12,768 13,010 Small Business Administration, 9.25%, 2010 34,989 35,731 Small Business Administration, 9.3%, 2010 86,243 87,803 Small Business Administration, 9.5%, 2010 71,699 72,788 Small Business Administration, 9.65%, 2010 103,409 105,278 Small Business Administration, 9.7%, 2010 51,101 51,844 Small Business Administration, 9.9%, 2008 15,121 15,253 Small Business Administration, 10.05%, 2008 - 2009 4,560 4,629 U.S. Department of Housing & Urban Development, 6.36%, 2016 7,000,000 7,221,228 U.S. Department of Housing & Urban Development, 6.59%, 2016 6,599,000 6,686,476 -------------- $ 233,165,016 - ---------------------------------------------------------------------------------------------------------------------------------- U.S. Treasury Obligations - 19.4% - ---------------------------------------------------------------------------------------------------------------------------------- U.S. Treasury Bonds, 7.5%, 2016 $ 11,740,000 $14,274,185 U.S. Treasury Bonds, 6.25%, 2023 15,238,000 17,562,984 U.S. Treasury Bonds, 6.875%, 2025 1,307,000 1,616,901 U.S. Treasury Bonds, 6%, 2026 26,483,000 30,076,823 U.S. Treasury Bonds, 5.25%, 2028 1,139,000 1,196,039 U.S. Treasury Bonds, 6.25%, 2030 6,166,000 7,338,021 U.S. Treasury Bonds, STRIPS, 0%, 2021 14,612,000 7,246,894 U.S. Treasury Bonds, STRIPS, 0%, 2027 8,016,000 2,967,740 U.S. Treasury Notes, 5.5%, 2008 16,147,000 16,237,827 U.S. Treasury Notes, 6%, 2009 4,566,000 4,719,390 U.S. Treasury Notes, 6.5%, 2010 (f) 25,197,000 26,525,739 U.S. Treasury Notes, 5.125%, 2011 80,568,000 83,142,389 U.S. Treasury Notes, 4%, 2014 19,976,000 19,595,217 U.S. Treasury Notes, TIPS, 3.875%, 2009 10,538,907 10,684,638 U.S. Treasury Notes, TIPS, 2.375%, 2017 13,837,341 13,820,045 -------------- $ 257,004,832 - ---------------------------------------------------------------------------------------------------------------------------------- TOTAL BONDS (IDENTIFIED COST, $1,273,634,123) $1,265,118,373 - ---------------------------------------------------------------------------------------------------------------------------------- Money Market Funds (v) - 4.3% - ---------------------------------------------------------------------------------------------------------------------------------- MFS Institutional Money Market Portfolio, 5.296%, at cost and net asset value 57,193,048 $ 57,193,048 - ---------------------------------------------------------------------------------------------------------------------------------- TOTAL INVESTMENTS (IDENTIFIED COST, $1,330,827,171) (k) $1,322,311,421 - ---------------------------------------------------------------------------------------------------------------------------------- Other Assets, Less Liabilities - 0.3% 4,188,404 - ---------------------------------------------------------------------------------------------------------------------------------- NET ASSETS - 100.0% $1,326,499,825 - ---------------------------------------------------------------------------------------------------------------------------------- (f) All or a portion of the security has been segregated as collateral for an open futures contract. (k) As of August 31, 2007, the fund held securities fair valued in accordance with the policies adopted by the Board of Trustees, aggregating $1,253,587,246 and 94.80% of market value. All of these security values were provided by an independent pricing service using an evaluated bid. (n) Securities exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be sold in the ordinary course of business in transactions exempt from registration, normally to qualified institutional buyers. At period end, the aggregate value of these securities was $11,371,852 representing 0.86% of net assets. (v) Affiliated fund that is available only to investment companies managed by MFS. The rate quoted is the annualized seven-day yield of the fund at period end. FUTURES CONTRACTS OUTSTANDING AT AUGUST 31, 2007: UNREALIZED EXPIRATION APPRECIATION DESCRIPTION CONTRACTS VALUE DATE (DEPRECIATION) U.S. Treasury Bond (Short) 224 $24,990,000 Dec-07 $(25,284) U.S. Treasury Note 5 yr (Long) 175 18,673,047 Dec-07 (36,160) U.S. Treasury Note 10 yr (Long) 371 40,456,391 Dec-07 192,911 - ------------------------------------------------------------------------------------------ $131,467 ======== At August 31, 2007, the fund had sufficient cash and/or securities to cover any commitments under these derivative contracts. The following abbreviations are used in this report and are defined: STRIPS Separate Trading of Registered Interest and Principal of Securities TIPS Treasury Inflation Protected Security INSURER FGIC Financial Guaranty Insurance Co. SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENT OF ASSETS AND LIABILITIES At 8/31/07 (unaudited) This statement represents your fund's balance sheet, which details the assets and liabilities comprising the total value of the fund. ASSETS - ----------------------------------------------------------------------------------------------------- Investments, at value Unaffiliated issuers (identified cost, $1,273,634,123) $1,265,118,373 Affiliated issuers (identified cost, $57,193,048) 57,193,048 Total investments, at value (identified cost, $1,330,827,171) 1,322,311,421 Cash 10,917 Receivable for fund shares sold 5,418,944 Interest and dividends receivable 9,108,649 Other assets 5,801 - ----------------------------------------------------------------------------------------------------- Total assets $1,336,855,732 - ----------------------------------------------------------------------------------------------------- LIABILITIES - ----------------------------------------------------------------------------------------------------- Distributions payable $5,107,249 Payable for daily variation margin on open futures contracts 107,406 Payable for fund shares reacquired 4,309,840 Payable to affiliates Management fee 21,815 Shareholder servicing costs 452,477 Distribution and service fees 17,423 Administrative services fee 1,146 Retirement plan administration and services fees 204 Payable for independent trustees' compensation 130,717 Accrued expenses and other liabilities 207,630 - ----------------------------------------------------------------------------------------------------- Total liabilities $10,355,907 - ----------------------------------------------------------------------------------------------------- Net assets $1,326,499,825 - ----------------------------------------------------------------------------------------------------- NET ASSETS CONSIST OF - ----------------------------------------------------------------------------------------------------- Paid-in capital $1,411,137,396 Unrealized appreciation (depreciation) on investments (8,384,283) Accumulated net realized gain (loss) on investments (76,458,578) Undistributed net investment income 205,290 - ----------------------------------------------------------------------------------------------------- Net assets $1,326,499,825 - ----------------------------------------------------------------------------------------------------- Shares of beneficial interest outstanding 140,678,824 - ----------------------------------------------------------------------------------------------------- Statement of Assets and Liabilities (unaudited) - continued Class A shares - ----------------------------------------------------------------------------------------------------- Net assets $712,706,417 Shares outstanding 75,571,475 - ----------------------------------------------------------------------------------------------------- Net asset value per share $9.43 - ----------------------------------------------------------------------------------------------------- Offering price per share (100/95.25Xnet asset value per share) $9.90 - ----------------------------------------------------------------------------------------------------- Class B shares - ----------------------------------------------------------------------------------------------------- Net assets $101,817,279 Shares outstanding 10,812,814 - ----------------------------------------------------------------------------------------------------- Net asset value and offering price per share $9.42 - ----------------------------------------------------------------------------------------------------- Class C shares - ----------------------------------------------------------------------------------------------------- Net assets $27,187,650 Shares outstanding 2,875,187 - ----------------------------------------------------------------------------------------------------- Net asset value and offering price per share $9.46 - ----------------------------------------------------------------------------------------------------- Class I shares - ----------------------------------------------------------------------------------------------------- Net assets $455,743,936 Shares outstanding 48,338,340 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.43 - ----------------------------------------------------------------------------------------------------- Class R shares - ----------------------------------------------------------------------------------------------------- Net assets $6,065,619 Shares outstanding 643,525 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.43 - ----------------------------------------------------------------------------------------------------- Class R1 shares - ----------------------------------------------------------------------------------------------------- Net assets $1,646,423 Shares outstanding 174,732 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.42 - ----------------------------------------------------------------------------------------------------- Class R2 shares - ----------------------------------------------------------------------------------------------------- Net assets $846,421 Shares outstanding 89,859 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.42 - ----------------------------------------------------------------------------------------------------- Class R3 shares - ----------------------------------------------------------------------------------------------------- Net assets $5,968,983 Shares outstanding 633,556 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.42 - ----------------------------------------------------------------------------------------------------- Statement of Assets and Liabilities (unaudited) - continued Class R4 shares - ----------------------------------------------------------------------------------------------------- Net assets $11,768,854 Shares outstanding 1,247,977 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.43 - ----------------------------------------------------------------------------------------------------- Class R5 shares - ----------------------------------------------------------------------------------------------------- Net assets $2,748,243 Shares outstanding 291,359 - ----------------------------------------------------------------------------------------------------- Net asset value, offering price, and redemption price per share $9.43 - ----------------------------------------------------------------------------------------------------- On sales of $50,000 or more, the offering price of Class A shares is reduced. A contingent deferred sales charge may be imposed on redemptions of Class A, Class B, and Class C shares. SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENT OF OPERATIONS Six months ended 8/31/07 (unaudited) This statement describes how much your fund earned in investment income and accrued in expenses. It also describes any gains and/or losses generated by fund operations. NET INVESTMENT INCOME - ----------------------------------------------------------------------------------------- Interest income $34,040,842 Income distributions from affiliated issuers 552,682 - ----------------------------------------------------------------------------------------- Total investment income $34,593,524 - ----------------------------------------------------------------------------------------- Expenses Management fee $2,668,778 Distribution and service fees 1,647,195 Program manager fees 133 Shareholder servicing costs 893,273 Administrative services fee 117,282 Retirement plan administration and services fees 15,505 Independent trustees' compensation 20,535 Custodian fee 80,851 Shareholder communications 57,368 Auditing fees 25,510 Legal fees 11,661 Miscellaneous 131,472 - ----------------------------------------------------------------------------------------- Total expenses $5,669,563 - ----------------------------------------------------------------------------------------- Fees paid indirectly (1,985) Reduction of expenses by investment adviser (670,964) - ----------------------------------------------------------------------------------------- Net expenses $4,996,614 - ----------------------------------------------------------------------------------------- Net investment income $29,596,910 - ----------------------------------------------------------------------------------------- REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS - ----------------------------------------------------------------------------------------- Realized gain (loss) (identified cost basis) Investment transaction income $(3,794,354) Futures contracts 1,869,770 - ----------------------------------------------------------------------------------------- Net realized gain (loss) on investments $(1,924,584) - ----------------------------------------------------------------------------------------- Change in unrealized appreciation (depreciation) Investments $(4,249,855) Futures contracts (14,788) - ----------------------------------------------------------------------------------------- Net unrealized gain (loss) on investments $(4,264,643) - ----------------------------------------------------------------------------------------- Net realized and unrealized gain (loss) on investments $(6,189,227) - ----------------------------------------------------------------------------------------- Change in net assets from operations $23,407,683 - ----------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Statements STATEMENTS OF CHANGES IN NET ASSETS These statements describe the increases and/or decreases in net assets resulting from operations, any distributions, and any shareholder transactions. SIX MONTHS ENDED YEAR ENDED 8/31/07 2/28/07 (UNAUDITED) CHANGE IN NET ASSETS FROM OPERATIONS - ------------------------------------------------------------------------------------------------- Net investment income $29,596,910 $57,587,166 Net realized gain (loss) on investments (1,924,584) (4,488,989) Net unrealized gain (loss) on investments (4,264,643) 8,283,788 - ------------------------------------------------------------------------------------------------- Change in net assets from operations $23,407,683 $61,381,965 - ------------------------------------------------------------------------------------------------- DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ------------------------------------------------------------------------------------------------- From net investment income Class A $(16,686,073) $(34,710,885) Class B (2,175,707) (5,536,265) Class C (524,945) (1,162,820) Class I (10,956,443) (18,749,306) Class R (184,834) (500,675) Class R1 (23,211) (13,926) Class R2 (28,644) (30,894) Class R3 (95,216) (112,323) Class R4 (217,355) (215,531) Class R5 (22,226) (2,443) Class 529A (883) (15,334) Class 529B (695) (13,460) Class 529C (447) (7,793) - ------------------------------------------------------------------------------------------------- Total distributions declared to shareholders $(30,916,679) $(61,071,655) - ------------------------------------------------------------------------------------------------- Change in net assets from fund share transactions $(6,294,296) $(72,725,449) - ------------------------------------------------------------------------------------------------- Total change in net assets $(13,803,292) $(72,415,139) - ------------------------------------------------------------------------------------------------- NET ASSETS - ------------------------------------------------------------------------------------------------- At beginning of period 1,340,303,117 1,412,718,256 At end of period (including undistributed net investment income of $205,290 and $1,525,059, respectively) $1,326,499,825 $1,340,303,117 - ------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Statements FINANCIAL HIGHLIGHTS The financial highlights table is intended to help you understand the fund's financial performance for the semiannual period and the past 5 fiscal years (or life of a particular share class, if shorter). Certain information reflects financial results for a single fund share. The total returns in the table represent the rate by which an investor would have earned (or lost) on an investment in the fund share class (assuming reinvestment of all distributions) held for the entire period. SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ------------------------------------------------------------ CLASS A 8/31/07 2007 2006 2005 2004 2003 (UNAUDITED) Net asset value, beginning of period $9.48 $9.47 $9.65 $9.84 $10.03 $9.73 - ----------------------------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------------------------------------------------- Net investment income (d) $0.21 $0.40 $0.39 $0.36 $0.29 $0.39 Net realized and unrealized gain (loss) on investments (0.04) 0.04 (0.17) (0.19) (0.08) 0.42 - ----------------------------------------------------------------------------------------------------------------------------- Total from investment operations $0.17 $0.44 $0.22 $0.17 $0.21 $0.81 - ----------------------------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------------------------------------------------- From net investment income $(0.22) $(0.43) $(0.40) $(0.36) $(0.40) $(0.51) - ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.43 $9.48 $9.47 $9.65 $9.84 $10.03 - ----------------------------------------------------------------------------------------------------------------------------- Total return (%) (r)(s)(t) 1.82(n) 4.75 2.28 1.81 2.19 8.54 - ----------------------------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 0.85(a) 0.88 0.90 0.93 1.00 0.98 Expenses after expense reductions (f) 0.75(a) 0.78 0.80 0.83 0.95 0.93 Net investment income 4.44(a) 4.29 4.03 3.75 2.94 3.97 Portfolio turnover 21 14 73 126 143 134 Net assets at end of period (000 Omitted) $712,706 $731,126 $826,001 $932,879 $803,974 $927,886 - ----------------------------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ------------------------------------------------------------ CLASS B 8/31/07 2007 2006 2005 2004 2003 (UNAUDITED) Net asset value, beginning of period $9.47 $9.46 $9.64 $9.83 $10.02 $9.72 - ----------------------------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------------------------------------------------- Net investment income (d) $0.17 $0.33 $0.31 $0.29 $0.24 $0.33 Net realized and unrealized gain (loss) on investments (0.04) 0.04 (0.16) (0.18) (0.09) 0.41 - ----------------------------------------------------------------------------------------------------------------------------- Total from investment operations $0.13 $0.37 $0.15 $0.11 $0.15 $0.74 - ----------------------------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------------------------------------------------- From net investment income $(0.18) $(0.36) $(0.33) $(0.30) $(0.34) $(0.44) - ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.42 $9.47 $9.46 $9.64 $9.83 $10.02 - ----------------------------------------------------------------------------------------------------------------------------- Total return (%) (r)(s)(t) 1.44(n) 3.97 1.52 1.12 1.53 7.84 - ----------------------------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.60(a) 1.64 1.65 1.62 1.64 1.63 Expenses after expense reductions (f) 1.50(a) 1.54 1.55 1.52 1.59 1.58 Net investment income 3.68(a) 3.55 3.27 3.03 2.42 3.32 Portfolio turnover 21 14 73 126 143 134 Net assets at end of period (000 Omitted) $101,817 $124,277 $175,207 $233,734 $255,512 $408,553 - ----------------------------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ------------------------------------------------------------ CLASS C 8/31/07 2007 2006 2005 2004 2003 (UNAUDITED) Net asset value, beginning of period $9.51 $9.50 $9.68 $9.87 $10.06 $9.76 - ----------------------------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------------------------------------------------- Net investment income (d) $0.17 $0.33 $0.32 $0.29 $0.25 $0.33 Net realized and unrealized gain (loss) on investments (0.04) 0.04 (0.17) (0.18) (0.10) 0.41 - ----------------------------------------------------------------------------------------------------------------------------- Total from investment operations $0.13 $0.37 $0.15 $0.11 $0.15 $0.74 - ----------------------------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------------------------------------------------- From net investment income $(0.18) $(0.36) $(0.33) $(0.30) $(0.34) $(0.44) - ----------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.46 $9.51 $9.50 $9.68 $9.87 $10.06 - ----------------------------------------------------------------------------------------------------------------------------- Total return (%) (r)(t) 1.44(n) 3.97 1.52 1.13 1.54 7.81 - ----------------------------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.60(a) 1.64 1.65 1.62 1.64 1.63 Expenses after expense reductions (f) 1.50(a) 1.54 1.55 1.52 1.59 1.58 Net investment income 3.68(a) 3.55 3.27 2.95 2.47 3.32 Portfolio turnover 21 14 73 126 143 134 Net assets at end of period (000 Omitted) $27,188 $27,529 $35,768 $44,692 $63,609 $110,096 - ----------------------------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ----------------------------------------------------------------- CLASS I 8/31/07 2007 2006 2005 2004 2003 (UNAUDITED) Net asset value, beginning of period $9.48 $9.47 $9.65 $9.84 $10.03 $9.73 - ---------------------------------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ---------------------------------------------------------------------------------------------------------------------------------- Net investment income (d) $0.22 $0.42 $0.41 $0.39 $0.25 $0.33 Net realized and unrealized gain (loss) on investments (0.04) 0.04 (0.17) (0.19) (0.00)(g)(w) 0.51 - ---------------------------------------------------------------------------------------------------------------------------------- Total from investment operations $0.18 $0.46 $0.24 $0.20 $0.25 $0.84 - ---------------------------------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ---------------------------------------------------------------------------------------------------------------------------------- From net investment income $(0.23) $(0.45) $(0.42) $(0.39) $(0.44) $(0.54) - ---------------------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.43 $9.48 $9.47 $9.65 $9.84 $10.03 - ---------------------------------------------------------------------------------------------------------------------------------- Total return (%) (r)(s) 1.94(n) 5.01 2.54 2.14 2.55 8.92 - ---------------------------------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ---------------------------------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 0.60(a) 0.63 0.65 0.60 0.67 0.63 Expenses after expense reductions (f) 0.50(a) 0.53 0.55 0.50 0.62 0.58 Net investment income 4.69(a) 4.54 4.34 4.09 2.57 3.64 Portfolio turnover 21 14 73 126 143 134 Net assets at end of period (000 Omitted) $455,744 $432,536 $359,623 $279,080 $168,124 $33,682 - ---------------------------------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ----------------------------------------------------- CLASS R 8/31/07 2007 2006 2005 2004 2003(i) (UNAUDITED) Net asset value, beginning of period $9.48 $9.47 $9.65 $9.84 $10.03 $10.03 - ---------------------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ---------------------------------------------------------------------------------------------------------------------- Net investment income (d) $0.20 $0.38 $0.36 $0.34 $0.18 $0.16 Net realized and unrealized gain (loss) on investments (0.04) 0.03 (0.17) (0.18) 0.02(g) (0.08) - ---------------------------------------------------------------------------------------------------------------------- Total from investment operations $0.16 $0.41 $0.19 $0.16 $0.20 $0.08 - ---------------------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ---------------------------------------------------------------------------------------------------------------------- From net investment income $(0.21) $(0.40) $(0.37) $(0.35) $(0.39) $(0.08) - ---------------------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.43 $9.48 $9.47 $9.65 $9.84 $10.03 - ---------------------------------------------------------------------------------------------------------------------- Total return (%) (r)(s) 1.69(n) 4.49 2.03 1.63 2.05 0.78(n) - ---------------------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ---------------------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.10(a) 1.14 1.15 1.11 1.19 1.13(a) Expenses after expense reductions (f) 1.00(a) 1.03 1.05 1.01 1.14 1.08(a) Net investment income 4.19(a) 4.03 3.76 3.64 1.87 3.04(a) Portfolio turnover 21 14 73 126 143 134 Net assets at end of period (000 Omitted) $6,066 $9,995 $11,751 $9,411 $6,188 $79 - ---------------------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 ENDED ------------------ CLASS R1 8/31/07 2007 2006(i) (UNAUDITED) Net asset value, beginning of period $9.48 $9.46 $9.57 - ----------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------- Net investment income (d) $0.17 $0.32 $0.29 Net realized and unrealized gain (loss) on investments (0.05) 0.05 (0.12)(g) - ----------------------------------------------------------------------------------- Total from investment operations $0.12 $0.37 $0.17 - ----------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------- From net investment income $(0.18) $(0.35) $(0.28) - ----------------------------------------------------------------------------------- Net asset value, end of period $9.42 $9.48 $9.46 - ----------------------------------------------------------------------------------- Total return (%) (r)(s) 1.28(n) 3.98 1.82(n) - ----------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.71(a) 1.82 1.85(a) Expenses after expense reductions (f) 1.60(a) 1.62 1.68(a) Net investment income 3.59(a) 3.45 3.25(a) Portfolio turnover 21 14 73 Net assets at end of period (000 Omitted) $1,646 $586 $192 - ----------------------------------------------------------------------------------- SIX MONTHS YEARS ENDED 2/28 ENDED ------------------ CLASS R2 8/31/07 2007 2006(i) (UNAUDITED) Net asset value, beginning of period $9.47 $9.46 $9.57 - ----------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------- Net investment income (d) $0.19 $0.35 $0.31 Net realized and unrealized gain (loss) on investments (0.04) 0.04 (0.11)(g) - ----------------------------------------------------------------------------------- Total from investment operations $0.15 $0.39 $0.20 - ----------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------- From net investment income $(0.20) $(0.38) $(0.31) - ----------------------------------------------------------------------------------- Net asset value, end of period $9.42 $9.47 $9.46 - ----------------------------------------------------------------------------------- Total return (%) (r)(s) 1.56(n) 4.23 2.13(n) - ----------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.38(a) 1.52 1.55(a) Expenses after expense reductions (f) 1.25(a) 1.27 1.34(a) Net investment income 3.96(a) 3.80 3.60(a) Portfolio turnover 21 14 73 Net assets at end of period (000 Omitted) $846 $1,239 $358 - ----------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 AND 2/29 ENDED ---------------------------------------- CLASS R3 8/31/07 2007 2006 2005 2004(i) (UNAUDITED) Net asset value, beginning of period $9.48 $9.47 $9.65 $9.84 $9.69 - --------------------------------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - --------------------------------------------------------------------------------------------------------- Net investment income (d) $0.19 $0.37 $0.35 $0.38 $0.02 Net realized and unrealized gain (loss) on investments (0.05) 0.03 (0.18) (0.25) 0.23(g) - --------------------------------------------------------------------------------------------------------- Total from investment operations $0.14 $0.40 $0.17 $0.13 $0.25 - --------------------------------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - --------------------------------------------------------------------------------------------------------- From net investment income $(0.20) $(0.39) $(0.35) $(0.32) $(0.10) - --------------------------------------------------------------------------------------------------------- Net asset value, end of period $9.42 $9.48 $9.47 $9.65 $9.84 - --------------------------------------------------------------------------------------------------------- Total return (%) (r)(s) 1.51(n) 4.34 1.82 1.38 2.58(n) - --------------------------------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - --------------------------------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.26(a) 1.37 1.40 1.36 1.42(a) Expenses after expense reductions (f) 1.15(a) 1.17 1.24 1.26 1.37(a) Net investment income 4.03(a) 3.89 3.64 3.99 0.72(a) Portfolio turnover 21 14 73 126 143 Net assets at end of period (000 Omitted) $5,969 $3,928 $1,392 $422 $41 - --------------------------------------------------------------------------------------------------------- SEE NOTES TO FINANCIAL STATEMENTS Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 ENDED ------------------ CLASS R4 8/31/07 2007 2006(i) (UNAUDITED) Net asset value, beginning of period $9.48 $9.48 $9.58 - ----------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------- Net investment income (d) $0.20 $0.39 $0.36 Net realized and unrealized gain (loss) on investments (0.04) 0.02 (0.11)(g) - ----------------------------------------------------------------------------------- Total from investment operations $0.16 $0.41 $0.25 - ----------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------- From net investment income $(0.21) $(0.41) $(0.35) - ----------------------------------------------------------------------------------- Net asset value, end of period $9.43 $9.48 $9.48 - ----------------------------------------------------------------------------------- Total return (%) (r)(s) 1.74(n) 4.49 2.64(n) - ----------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------- Expenses before expense reductions (f) 1.00(a) 1.02 1.05(a) Expenses after expense reductions (f) 0.90(a) 0.92 0.95(a) Net investment income 4.29(a) 4.15 4.02(a) Portfolio turnover 21 14 73 Net assets at end of period (000 Omitted) $11,769 $8,108 $1,305 - ----------------------------------------------------------------------------------- Financial Highlights - continued SIX MONTHS YEARS ENDED 2/28 ENDED ------------------ CLASS R5 8/31/07 2007 2006(i) (UNAUDITED) Net asset value, beginning of period $9.51 $9.47 $9.58 - ----------------------------------------------------------------------------------- INCOME (LOSS) FROM INVESTMENT OPERATIONS - ----------------------------------------------------------------------------------- Net investment income (d) $0.21 $0.42 $0.37 Net realized and unrealized gain (loss) on investments (0.06) 0.06 (0.10)(g) - ----------------------------------------------------------------------------------- Total from investment operations $0.15 $0.48 $0.27 - ----------------------------------------------------------------------------------- LESS DISTRIBUTIONS DECLARED TO SHAREHOLDERS - ----------------------------------------------------------------------------------- From net investment income $(0.23) $(0.44) $(0.38) - ----------------------------------------------------------------------------------- Net asset value, end of period $9.43 $9.51 $9.47 - ----------------------------------------------------------------------------------- Total return (%) (r)(s) 1.57(n) 5.24 2.81(n) - ----------------------------------------------------------------------------------- RATIOS (%) (TO AVERAGE NET ASSETS) AND SUPPLEMENTAL DATA: - ----------------------------------------------------------------------------------- Expenses before expense reductions (f) 0.70(a) 0.73 0.75(a) Expenses after expense reductions (f) 0.60(a) 0.63 0.65(a) Net investment income 4.54(a) 4.44 4.20(a) Portfolio turnover 21 14 73 Net assets at end of period (000 Omitted) $2,748 $54 $51 - ----------------------------------------------------------------------------------- Any redemption fees charged by the fund during the 2004 and 2005 fiscal years resulted in a per share impact of less than $0.01. (a) Annualized. (d) Per share data are based on average shares outstanding. (f) Ratios do not reflect reductions from fees paid indirectly. (g) The per share amount is not in accordance with the net realized and unrealized gain/loss for the period because of the timing of sales of fund shares and the per share amount of realized and unrealized gains and losses at such time. (i) For the period from the class' inception, December 31, 2002 (Class R), October 31, 2003 (Class R3), April 1, 2005 (Classes R1, R2, R4, and R5) through the stated period end. (n) Not annualized. (r) Certain expenses have been reduced without which performance would have been lower. (s) From time to time the fund may receive proceeds from litigation settlements, without which performance would be lower. (t) Total returns do not include any applicable sales charges. (w) Per share amount was less than $0.01. SEE NOTES TO FINANCIAL STATEMENTS NOTES TO FINANCIAL STATEMENTS (unaudited) (1) BUSINESS AND ORGANIZATION MFS Government Securities Fund (the fund) is a series of MFS Series Trust XIII (the trust). The trust is organized as a Massachusetts business trust and is registered under the Investment Company Act of 1940, as amended, as an open- end management investment company. (2) SIGNIFICANT ACCOUNTING POLICIES GENERAL - The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. INVESTMENT VALUATIONS - Debt instruments (other than short-term instruments), including restricted debt instruments, are generally valued at an evaluated or composite bid as reported by an independent pricing service. Short-term instruments with a maturity at issuance of 60 days or less may be valued at amortized cost, which approximates market value. Futures contracts are generally valued at last posted settlement price as reported by an independent pricing service on the market on which they are primarily traded. Futures contracts for which there were no trades that day for a particular position are generally valued at the closing bid quotation as reported by an independent pricing service on the market on which such futures contracts are primarily traded. Securities and other assets generally valued on the basis of information from an independent pricing service may also be valued at a broker-dealer bid quotation. Values obtained from pricing services can utilize both dealer-supplied valuations and electronic data processing techniques, which take into account factors such as institutional-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, trading characteristics, and other market data. The Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund's investments (including any fair valuation) to the adviser pursuant to valuation policies and procedures approved by the Board. If the adviser determines that reliable market quotations are not readily available, investments are valued at fair value as determined in good faith by the adviser in accordance with such procedures under the oversight of the Board of Trustees. Under the fund's valuation policies and procedures, market quotations are not considered to be readily available for many types of debt instruments and certain types of derivatives. These investments are generally valued at fair value based on information from independent pricing services. In addition, investments may be valued at fair value if the adviser determines that an investment's value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund's net asset value, or after the halting of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. Events that occur on a frequent basis after foreign markets close (such as developments in foreign markets and significant movements in the U.S. markets) and prior to the determination of the fund's net asset value may be deemed to have a material affect on the value of securities traded in foreign markets. Accordingly, the fund's foreign equity securities may often be valued at fair value. The adviser may rely on independent pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund's net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of investments used to determine the fund's net asset value may differ from quoted or published prices for the same investments. In September 2006, FASB Statement No. 157, Fair Value Measurements (the "Statement") was issued, and is effective for fiscal years beginning after November 15, 2007 and for all interim periods within those fiscal years. This Statement provides a single definition of fair value, a hierarchy for measuring fair value and expanded disclosures about fair value measurements. Management is evaluating the application of the Statement to the fund, and believes the impact will be limited to expanded disclosures resulting from the adoption of this Statement in the fund's financial statements. REPURCHASE AGREEMENTS - The fund may enter into repurchase agreements with institutions that the fund's investment adviser has determined are creditworthy. Each repurchase agreement is recorded at cost. The fund requires that the securities collateral in a repurchase transaction be transferred to the custodian in a manner sufficient to enable the fund to obtain those securities in the event of a default under the repurchase agreement. The fund monitors, on a daily basis, the value of the collateral to ensure that its value, including accrued interest, is greater than amounts owed to the fund under each such repurchase agreement. INFLATION-ADJUSTED DEBT SECURITIES - The fund invests in inflation-adjusted debt securities issued by the U.S. Treasury. The fund may also invest in inflation-adjusted debt securities issued by U.S. Government agencies and instrumentalities other than the U.S. Treasury and by other entities such as U.S. and foreign corporations and foreign governments. The principal value of these debt securities is adjusted by references to changes in the Consumer Price Index or another general price or wage index. These debt securities typically pay a fixed rate of interest, but this fixed rate is applied to the inflation-adjusted principal amount. The principal paid at maturity of the debt security is typically equal to the inflation-adjusted principal amount, or the security's original par value, whichever is greater. Other types of inflation-adjusted securities may use other methods to adjust for other measures of inflation. DERIVATIVE RISK - The fund may invest in derivatives for hedging or non- hedging purposes. While hedging can reduce or eliminate losses, it can also reduce or eliminate gains. When the fund uses derivatives as an investment to gain market exposure, or for hedging purposes, gains and losses from derivative instruments may be substantially greater than the derivative's original cost. Derivative instruments include futures contracts. FUTURES CONTRACTS - The fund may enter into futures contracts for the delayed delivery of securities or currency, or contracts based on financial indices at a fixed price on a future date. In entering such contracts, the fund is required to deposit with the broker either in cash or securities an amount equal to a certain percentage of the contract amount. Subsequent payments are made or received by the fund each day, depending on the daily fluctuations in the value of the contract, and are recorded for financial statement purposes as unrealized gains or losses by the fund. Upon entering into such contracts, the fund bears the risk of interest or exchange rates or securities prices moving unexpectedly, in which case, the fund may not achieve the anticipated benefits of the futures contracts and may realize a loss. INDEMNIFICATIONS - Under the fund's organizational documents, its officers and trustees may be indemnified against certain liabilities and expenses arising out of the performance of their duties to the fund. Additionally, in the normal course of business, the fund enters into agreements with service providers that may contain indemnification clauses. The fund's maximum exposure under these agreements is unknown as this would involve future claims that may be made against the fund that have not yet occurred. INVESTMENT TRANSACTIONS AND INCOME - Investment transactions are recorded on the trade date. Some securities may be purchased on a "when-issued" or "forward delivery" basis, which means that the securities will be delivered to the fund at a future date, usually beyond customary settlement time. Interest income is recorded on the accrual basis. All premium and discount is amortized or accreted for financial statement purposes in accordance with U.S. generally accepted accounting principles. All discount is accreted for tax reporting purposes as required by federal income tax regulations. The fund may receive proceeds from litigation settlements. Any proceeds received from litigation involving portfolio holdings are reflected in the Statement of Operations in realized gain/loss if the security has been disposed of by the fund or in unrealized gain/loss if the security is still held by the fund. Any other proceeds from litigation not related to portfolio holdings are reflected as other income in the Statement of Operations. The fund may enter into "TBA" (to be announced) purchase commitments to purchase securities for a fixed unit price at a future date. Although the unit price has been established, the principal value has not been finalized. However, the principal amount of the commitments will not fluctuate more than 0.01%. The fund holds, and maintains until settlement date, cash or high-grade debt obligations in an amount sufficient to meet the purchase price, or the fund may enter into offsetting contracts for the forward sale of other securities it owns. Income on the securities will not be earned until settlement date. TBA purchase commitments may be considered securities in themselves, and involve a risk of loss if the value of the security to be purchased declines prior to settlement date, which is in addition to the risk of decline in the value of the fund's other assets. Unsettled TBA purchase commitments are valued at the current market value of the underlying securities. The fund may enter into "TBA" (to be announced) sale commitments to hedge its portfolio positions or to sell mortgage-backed securities it owns under delayed delivery arrangements. Proceeds of TBA sale commitments are not received until the contractual settlement date. During the time a TBA sale commitment is outstanding, equivalent deliverable securities, or an offsetting TBA purchase commitment deliverable on or before the sale commitment date, are held as "cover" for the transaction. FEES PAID INDIRECTLY - The fund's custody fee is reduced according to an arrangement that measures the value of cash deposited with the custodian by the fund. This amount, for the six months ended August 31, 2007, is shown as a reduction of total expenses on the Statement of Operations. TAX MATTERS AND DISTRIBUTIONS - The fund intends to qualify as a regulated investment company, as defined under Subchapter M of the Internal Revenue Code, and to distribute all of its taxable income, including realized capital gains. Accordingly, no provision for federal income tax is required in the financial statements. Foreign taxes, if any, have been accrued by the fund in the accompanying financial statements. Distributions to shareholders are recorded on the ex-dividend date. Income and capital gain distributions are determined in accordance with income tax regulations, which may differ from U.S. generally accepted accounting principles. Certain capital accounts in the financial statements are periodically adjusted for permanent differences in order to reflect their tax character. These adjustments have no impact on net assets or net asset value per share. Temporary differences which arise from recognizing certain items of income, expense, gain or loss in different periods for financial statement and tax purposes will reverse at some time in the future. Distributions in excess of net investment income or net realized gains are temporary overdistributions for financial statement purposes resulting from differences in the recognition or classification of income or distributions for financial statement and tax purposes. Book/tax differences primarily relate to expiration of capital loss carryforwards and amortization and accretion of debt securities. The tax character of distributions made during the current period will be determined at fiscal year end. 2/28/07 Ordinary income (including any short-term capital gains) $61,071,655 The federal tax cost and the tax basis components of distributable earnings were as follows: AS OF 8/31/07 Cost of investments $1,331,274,447 --------------------------------------------------------------- Gross appreciation $10,275,567 Gross depreciation (19,238,593) --------------------------------------------------------------- Net unrealized appreciation (depreciation) $(8,963,026) AS OF 2/28/07 Undistributed ordinary income $6,756,987 Capital loss carryforwards (60,854,630) Post-October capital loss deferral (1,666,723) Other temporary differences (5,633,750) Net unrealized appreciation (depreciation) (15,730,459) The aggregate cost above includes prior fiscal year end tax adjustments. As of February 28, 2007, the fund had capital loss carryforwards available to offset future realized gains. Such losses expire as follows: 2/29/08 $(15,270,459) 2/28/09 (3,477,230) 2/28/11 (11,527,172) 2/29/12 (5,729,829) 2/28/13 (11,095,767) 2/28/14 (6,955,037) 2/28/15 (6,799,136) ---------------------------------------- Total $(60,854,630) The availability of a portion of the capital loss carryforwards, which were acquired on November 19, 2004 in connection with the MFS Government Mortgage Fund merger, may be limited in a given year. In June 2006, FASB Interpretation No. 48, Accounting for Uncertainty in Income Taxes (the "Interpretation") was issued, and is effective for fiscal years beginning after December 15, 2006 and is to be applied to all open tax years as of the effective date. On December 22, 2006, the SEC delayed the implementation of the Interpretation for regulated investment companies for an additional six months. This Interpretation prescribes a minimum threshold for financial statement recognition of the benefit of a tax position taken or expected to be taken in a tax return, and requires certain expanded disclosures. Management has evaluated the application of the Interpretation to the fund, and has determined that there is no impact resulting from the adoption of this Interpretation on the fund's financial statements. MULTIPLE CLASSES OF SHARES OF BENEFICIAL INTEREST - The fund offers multiple classes of shares, which differ in their respective distribution and service fees. All shareholders bear the common expenses of the fund based on the value of settled shares outstanding of each class, without distinction between share classes. Dividends are declared separately for each class. Differences in per share dividend rates are generally due to differences in separate class expenses. Class B shares will convert to Class A shares approximately eight years after purchase. Class 529A, Class 529B, and Class 529C shares closed on March 31, 2007. (3) TRANSACTIONS WITH AFFILIATES INVESTMENT ADVISER - The fund has an investment advisory agreement with Massachusetts Financial Services Company (MFS) to provide overall investment management and related administrative services and facilities to the fund. The management fee is computed daily and paid monthly at an annual rate of 40% of the fund's average daily net assets. As part of a settlement agreement with the New York Attorney General concerning market timing and related matters, MFS has agreed to reduce the management fee to 0.30% of the fund's average daily net assets for the period March 1, 2004 through February 28, 2009. For the six months ended August 31, 2007, this waiver amounted to $667,157 and is reflected as a reduction of total expenses in the Statement of Operations. The investment adviser has agreed in writing to pay a portion of the fund's operating expenses, exclusive of certain other fees and expenses, such that total annual fund operating expenses do not exceed the following rates annually of the fund's average daily net assets. CLASS A CLASS B CLASS C CLASS I CLASS R CLASS R1 CLASS R2 CLASS R3 CLASS R4 CLASS R5 0.80% 1.55% 1.55% 0.55% 1.05% 1.65% 1.30% 1.20% 0.95% 0.65% This written agreement may be rescinded only upon consent of the fund's Board of Trustees. For the six months ended August 31, 2007, the fund's actual operating expense did not exceed the limit and therefore, the investment adviser did not pay any portion of the fund's expenses. DISTRIBUTOR - MFS Fund Distributors, Inc. (MFD), a wholly-owned subsidiary of MFS, as distributor, received $19,786 and $9 for the six months ended August 31, 2007, as its portion of the initial sales charge on sales of Class A and Class 529A shares of the fund, respectively. The Board of Trustees has adopted a distribution plan for certain class shares pursuant to Rule 12b-1 of the Investment Company Act of 1940. The fund's distribution plan provides that the fund will pay MFD for services provided by MFD and financial intermediaries in connection with the distribution and servicing of certain share classes. One component of the plan is a distribution fee paid to MFD and another component of the plan is a service fee paid to MFD. MFD may subsequently pay all, or a portion, of the distribution and/or service fees to financial intermediaries. Distribution Fee Plan Table: TOTAL ANNUAL DISTRIBUTION DISTRIBUTION SERVICE DISTRIBUTION EFFECTIVE AND SERVICE FEE RATE FEE RATE PLAN (d) RATE (e) FEE Class A 0.10% 0.25% 0.35% 0.25% $900,225 Class B 0.75% 0.25% 1.00% 1.00% 559,184 Class C 0.75% 0.25% 1.00% 1.00% 134,924 Class R 0.25% 0.25% 0.50% 0.50% 21,140 Class R1 0.50% 0.25% 0.75% 0.75% 4,565 Class R2 0.25% 0.25% 0.50% 0.50% 3,452 Class R3 0.25% 0.25% 0.50% 0.50% 11,216 Class R4 -- 0.25% 0.25% 0.25% 12,094 Class 529A 0.25% 0.25% 0.50% 0.35% 74 Class 529B 0.75% 0.25% 1.00% 1.00% 193 Class 529C 0.75% 0.25% 1.00% 1.00% 128 - ---------------------------------------------------------------------------------------------------------- Total Distribution and Service Fees $1,647,195 (d) In accordance with the distribution plan for certain classes, the fund pays distribution and/or service fees up to these annual percentage rates of each class' average daily net assets. (e) The annual effective rates represent actual fees incurred under the distribution plan for the six months ended August 31, 2007 based on each class' average daily net assets. Payment of the 0.10% annual Class A distribution fee is not yet in effect and will be implemented on such date as the fund's Board of Trustees may determine. 0.10% of the Class 529A distribution fee was being paid prior to the closure of the share class. Certain Class A and Class C shares are subject to a contingent deferred sales charge in the event of a shareholder redemption within 12 months of purchase. Class B shares are subject to a contingent deferred sales charge in the event of a shareholder redemption within six years of purchase. All contingent deferred sales charges are paid to MFD and during the six months ended August 31, 2007, were as follows: AMOUNT Class A $5,853 Class B $79,984 Class C $1,992 The fund has entered into and may from time to time enter into contracts with program managers and other parties which administer the tuition programs through which an investment in the fund's 529 share classes is made. The fund has entered into an agreement with MFD pursuant to which MFD receives an annual fee of up to 0.35% of the average daily net assets attributable to each 529 share class. The fee is based on average daily net assets and is currently established at 0.25% annually of average daily net assets of the fund's 529 share classes. The fee may only be increased with the approval of the Board of Trustees who oversees the fund. The services provided by MFD, or a third party with which MFD contracts, include recordkeeping and tax reporting and account services, as well as services designed to maintain the program's compliance with the Internal Revenue Code and other regulatory requirements. Class 529A, Class 529B, and Class 529C shares closed on March 31, 2007. Program manager fees for the six months ended August 31, 2007, were as follows: AMOUNT Class 529A $53 Class 529B 48 Class 529C 32 --------------------------------------------- Total Program Manager Fees $133 SHAREHOLDER SERVICING AGENT - MFS Service Center, Inc. (MFSC), a wholly-owned subsidiary of MFS, receives a fee from the fund for its services as shareholder servicing agent calculated as a percentage of the average daily net assets of the fund as determined periodically under the supervision of the fund's Board of Trustees. For the six months ended August 31,2007, the fee was $322,079, which equated to 0.0483% annually of the fund's average daily net assets. MFSC also receives payment from the fund for out-of-pocket expenses, sub-accounting and other shareholder servicing costs which may be paid to affiliated and unaffiliated service providers. For the six months ended August 31, 2007, these out-of-pocket expenses, sub-accounting and other shareholder servicing costs amounted to $571,194. The fund may also pay shareholder servicing related costs directly to non-related parties. Effective May 1, 2007, under a Special Servicing Agreement among MFS, each MFS fund which invests in other MFS funds ("MFS fund-of-funds") and each underlying fund in which a MFS fund-of-funds invests ("underlying funds"), each underlying fund may pay a portion of each MFS fund-of-fund's transfer agent-related expenses, including sub-accounting fees payable to financial intermediaries, to the extent such payments do not exceed the benefits realized or expected to be realized by the underlying fund from the investment in the underlying fund by the MFS fund-of-fund. For the six months ended August 31, 2007, the fund did not incur any expenses under this agreement. ADMINISTRATOR - MFS provides certain financial, legal, shareholder communications, compliance, and other administrative services to the fund. Under an administrative services agreement, the fund partially reimburses MFS the costs incurred to provide these services. The fund is charged a fixed amount plus a fee based on average daily net assets. The fund's annual fixed amount is $17,500. The administrative services fee incurred for the six months ended August 31, 2007 was equivalent to an annual effective rate of 0.0176% of the fund's average daily net assets. In addition to the administrative services provided by MFS to the fund as described above, MFS is responsible for providing certain retirement plan administration and services with respect to certain shares. These services include various administrative, recordkeeping, and communication/educational services with respect to the retirement plans which invest in these shares, and may be provided directly by MFS or by a third party. MFS may subsequently pay all, or a portion, of the retirement plan administration and services fee to affiliated or unaffiliated third parties. For the six months ended August 31, 2007, the fund paid MFS an annual retirement plan administration and services fee up to the following annual percentage rates of each class' average daily net assets: BEGINNING OF ANNUAL PERIOD THROUGH EFFECTIVE EFFECTIVE TOTAL 3/31/07 4/01/07 RATE (g) AMOUNT Class R1 0.45% 0.35% 0.35% $2,193 Class R2 0.40% 0.25% 0.25% 1,888 Class R3 0.25% 0.15% 0.15% 3,705 Class R4 0.15% 0.15% 0.15% 7,257 Class R5 0.10% 0.10% 0.10% 462 - ------------------------------------------------------------------------------- Total Retirement Plan Administration and Services Fees $15,505 (g) Prior to April 1, 2007, MFS had agreed in writing to waive a portion of the retirement plan administration and services fee equal to 0.10% for Class R1, 0.15% for Class R2, and 0.10% for Class R3 shares. This agreement was discontinued on March 31, 2007. On April 1, 2007, the annual retirement plan administration and services fee for Class R1, Class R2, and Class R3 shares was lowered to 0.35%, 0.25%, and 0.15%, respectively. For the six months ended August 31, 2007, the waiver amounted to $565 and is reflected as a reduction of total expenses in the Statement of Operations. TRUSTEES' AND OFFICERS' COMPENSATION - The fund pays compensation to independent trustees in the form of a retainer, attendance fees, and additional compensation to Board and Committee chairpersons. The fund does not pay compensation directly to trustees or officers of the fund who are also officers of the investment adviser, all of whom receive remuneration for their services to the fund from MFS. Certain officers and trustees of the fund are officers or directors of MFS, MFD, and MFSC. The fund has an unfunded, defined benefit plan for certain retired independent trustees which resulted in a pension expense of $3,904. The fund also has an unfunded retirement benefit deferral plan for certain independent trustees which resulted in an expense of $1,490. Both amounts are included in independent trustees' compensation for the six months ended August 31, 2007. The liability for deferred retirement benefits payable to certain independent trustees under both plans amounted to $129,144 at August 31, 2007, and is included in payable for independent trustees' compensation. OTHER - This fund and certain other MFS funds (the funds) have entered into a services agreement (the Agreement) which provides for payment of fees by the funds to Tarantino LLC in return for the provision of services of an Independent Chief Compliance Officer (ICCO) for the funds. The ICCO is an officer of the funds and the sole member of Tarantino LLC. The funds can terminate the Agreement with Tarantino LLC at any time under the terms of the Agreement. For the six months ended August 31, 2007, the fee paid to Tarantino LLC was $3,302. MFS has agreed to reimburse the fund for a portion of the payments made by the funds to Tarantino LLC in the amount of $3,242, which is shown as a reduction of total expenses in the Statement of Operations. Additionally, MFS has agreed to bear all expenses associated with office space, other administrative support, and supplies provided to the ICCO. (4) PORTFOLIO SECURITIES Purchases and sales of investments, other than purchased option transactions and short-term obligations, were as follows: PURCHASES SALES U.S. government securities $218,834,546 $162,446,429 - ------------------------------------------------------------------------------- Investments (non-U.S. government securities) $59,751,040 $131,007,871 - ------------------------------------------------------------------------------- (5) SHARES OF BENEFICIAL INTEREST The fund's Declaration of Trust permits the Trustees to issue an unlimited number of full and fractional shares of beneficial interest. Transactions in fund shares were as follows: SIX MONTHS ENDED YEAR ENDED 8/31/07 2/28/07 SHARES AMOUNT SHARES AMOUNT Shares sold Class A 10,298,662 $96,414,855 11,285,264 $105,743,019 Class B 754,968 7,073,837 1,456,037 13,596,301 Class C 543,634 5,121,698 451,650 4,244,843 Class I 3,294,976 30,836,613 7,108,258 66,709,361 Class R 212,999 2,001,402 438,726 4,110,964 Class R1 157,398 1,481,615 107,909 1,010,776 Class R2 98,405 925,171 178,491 1,672,669 Class R3 425,770 3,980,771 566,006 5,301,972 Class R4 735,327 6,888,263 1,323,023 12,405,415 Class R5 340,158 3,206,013 -- -- Class 529A (c) -- -- 5,924 55,565 Class 529B (c) -- -- 1,011 9,420 Class 529C (c) -- -- 874 8,240 - --------------------------------------------------------------------------------------------------- 16,862,297 $157,930,238 22,923,173 $214,868,545 Shares issued to shareholders in reinvestment of distributions Class A 1,267,226 $11,903,259 2,638,948 $24,744,925 Class B 193,434 1,815,319 479,290 4,484,566 Class C 43,723 411,974 95,876 901,006 Class I 1,151,131 10,810,301 1,999,288 18,748,667 Class R 17,062 160,320 46,568 436,339 Class R1 2,123 19,893 1,451 13,630 Class R2 2,967 27,793 3,276 30,732 Class R3 9,274 87,008 11,854 111,221 Class R4 20,860 195,720 22,714 213,544 Class R5 1,770 16,592 261 2,443 Class 529A (c) 93 883 1,633 15,282 Class 529B (c) 73 695 1,418 13,272 Class 529C (c) 47 447 828 7,787 - --------------------------------------------------------------------------------------------------- 2,709,783 $25,450,204 5,303,405 $49,723,414 Shares reacquired Class A (13,083,643) $(122,580,497) (24,024,930) $(224,930,513) Class B (3,258,883) (30,514,664) (7,334,208) (68,583,138) Class C (607,021) (5,703,641) (1,418,028) (13,309,913) Class I (1,727,999) (16,217,621) (1,458,523) (13,641,690) Class R (641,141) (5,976,646) (671,979) (6,303,837) Class R1 (46,614) (437,482) (67,787) (635,778) Class R2 (142,259) (1,331,609) (88,895) (834,531) Class R3 (216,021) (2,031,267) (310,344) (2,910,384) Class R4 (363,052) (3,425,826) (628,599) (5,914,599) Class R5 (56,258) (526,227) -- -- Class 529A (c) (38,970) (369,664) (11,040) (102,491) Class 529B (c) (35,666) (338,234) (12,793) (119,862) Class 529C (c) (23,234) (221,360) (3,286) (30,672) - --------------------------------------------------------------------------------------------------- (20,240,761) $(189,674,738) (36,030,412) $(337,317,408) Net change Class A (1,517,755) $(14,262,383) (10,100,718) $(94,442,569) Class B (2,310,481) (21,625,508) (5,398,881) (50,502,271) Class C (19,664) (169,969) (870,502) (8,164,064) Class I 2,718,108 25,429,293 7,649,023 71,816,338 Class R (411,080) (3,814,924) (186,685) (1,756,534) Class R1 112,907 1,064,026 41,573 388,628 Class R2 (40,887) (378,645) 92,872 868,870 Class R3 219,023 2,036,512 267,516 2,502,809 Class R4 393,135 3,658,157 717,138 6,704,360 Class R5 285,670 2,696,378 261 2,443 Class 529A (c) (38,877) (368,781) (3,483) (31,644) Class 529B (c) (35,593) (337,539) (10,364) (97,170) Class 529C (c) (23,187) (220,913) (1,584) (14,645) - --------------------------------------------------------------------------------------------------- (668,681) $(6,294,296) (7,803,834) $(72,725,449) (c) Class 529A, Class 529B, and Class 529C shares closed on March 31, 2007. The fund is one of several mutual funds in which the MFS funds-of-funds may invest. The MFS funds-of-funds do not invest in the underlying MFS funds for the purpose of exercising management or control. At the end of the period, the MFS Conservative Allocation Fund, the MFS Growth Allocation Fund and MFS Moderate Allocation Fund were the owners of record of approximately 6%, 11%, and 17% respectively, of the value of outstanding voting shares. In addition, the MFS Lifetime 2010 Fund, the MFS Lifetime 2020 Fund, the MFS Lifetime 2030 Fund, and the MFS Lifetime Retirement Fund were each the owners of record of less than 1% of the value of outstanding voting shares. (6) LINE OF CREDIT The fund and other funds managed by MFS participate in a $1 billion unsecured committed line of credit provided by a syndication of banks under a credit agreement. In addition, the fund and other funds managed by MFS have established uncommitted borrowing arrangements with certain banks. Borrowings may be made for temporary financing needs. Interest is charged to each fund, based on its borrowings, generally at a rate equal to the Federal Reserve funds rate plus 0.30%. In addition, a commitment fee, based on the average daily, unused portion of the committed line of credit, is allocated among the participating funds at the end of each calendar quarter. For the six months ended August 31, 2007, the fund's commitment fee and interest expense were $4,171 and $0, respectively, and are included in miscellaneous expense on the Statement of Operations. (7) TRANSACTIONS IN SECURITIES OF AFFILIATED ISSUERS Affiliated issuers, as defined under the Investment Company Act of 1940, are those in which the fund's holdings of an issuer represent 5% or more of the outstanding voting securities of the issuer. A summary of the fund's transactions in the securities of these issuers during the six months ended August 31,2007, is set forth below: BEGINNING ACQUISITIONS DISPOSITIONS ENDING SHARES/PAR SHARES/PAR SHARES/PAR SHARES/PAR AFFILIATE AMOUNT AMOUNT AMOUNT AMOUNT MFS Institutional Money Market Portfolio -- 220,831,113 (163,638,065) 57,193,048 CAPITAL GAIN DISTRIBUTIONS FROM REALIZED UNDERLYING DIVIDEND ENDING AFFILIATE GAIN (LOSS) FUNDS INCOME VALUE MFS Institutional Money Market Portfolio -- -- $552,682 $57,193,048 BOARD REVIEW OF INVESTMENT ADVISORY AGREEMENT The Investment Company Act of 1940 requires that both the full Board of Trustees and a majority of the non-interested ("independent") Trustees, voting separately, annually approve the continuation of the Fund's investment advisory agreement with MFS. The Trustees consider matters bearing on the Fund and its advisory arrangements at their meetings throughout the year, including a review of performance data at each regular meeting. In addition, the independent Trustees met several times over the course of three months beginning in May and ending in July, 2007 ("contract review meetings") for the specific purpose of considering whether to approve the continuation of the investment advisory agreement for the Fund and the other investment companies that the Board oversees (the "MFS Funds"). The independent Trustees were assisted in their evaluation of the Fund's investment advisory agreement by independent legal counsel, from whom they received separate legal advice and with whom they met separately from MFS during various contract review meetings. The independent Trustees were also assisted in this process by the MFS Funds' Independent Chief Compliance Officer, a full-time senior officer appointed by and reporting to the independent Trustees. In connection with their deliberations regarding the continuation of the investment advisory agreement, the Trustees, including the independent Trustees, considered such information and factors as they believed, in light of the legal advice furnished to them and their own business judgment, to be relevant. The investment advisory agreement for the Fund was considered separately, although the Trustees also took into account the common interests of all MFS Funds in their review. As described below, the Trustees considered the nature, quality, and extent of the various investment advisory, administrative, and shareholder services performed by MFS under the existing investment advisory agreement and other arrangements with the Fund. In connection with their contract review meetings, the Trustees received and relied upon materials that included, among other items: (i) information provided by Lipper Inc. on the investment performance of the Fund for various time periods ended December 31, 2006 and the investment performance of a group of funds with substantially similar investment classifications/objectives (the "Lipper performance universe"), as well as the investment performance of a group of funds identified by objective criteria suggested by MFS ("MFS peer funds"), (ii) information provided by Lipper Inc. on the Fund's advisory fees and other expenses and the advisory fees and other expenses of comparable funds identified by Lipper (the "Lipper expense group"), as well as the advisory fees and other expenses of MFS peer funds, (iii) information provided by MFS on the advisory fees of comparable portfolios of other clients of MFS, including institutional separate accounts and other clients, (iv) information as to whether and to what extent applicable expense waivers, reimbursements or fee "breakpoints" are observed for the Fund, (v) information regarding MFS' financial results and financial condition, including MFS' and certain of its affiliates' estimated profitability from services performed for the Fund and the MFS Funds as a whole, (vi) MFS' views regarding the outlook for the mutual fund industry and the strategic business plans of MFS, (vii) descriptions of various functions performed by MFS for the Funds, such as compliance monitoring and portfolio trading practices, and (viii) information regarding the overall organization of MFS, including information about MFS' senior management and other personnel providing investment advisory, administrative and other services to the Fund and the other MFS Funds. The comparative performance, fee and expense information prepared and provided by Lipper Inc. was not independently verified and the independent Trustees did not independently verify any information provided to them by MFS. The Trustees' conclusion as to the continuation of the investment advisory agreement was based on a comprehensive consideration of all information provided to the Trustees and not the result of any single factor. Some of the factors that figured particularly in the Trustees' deliberations are described below, although individual Trustees may have evaluated the information presented differently from one another, giving different weights to various factors. It is also important to recognize that the fee arrangements for the Fund and other MFS Funds are the result of years of review and discussion between the independent Trustees and MFS, that certain aspects of such arrangements may receive greater scrutiny in some years than in others, and that the Trustees' conclusions may be based, in part, on their consideration of these same arrangements during the course of the year and in prior years. Based on information provided by Lipper Inc. and MFS, the Trustees reviewed the Fund's total return investment performance as well as the performance of peer groups of funds over various time periods. The Trustees placed particular emphasis on the total return performance of the Fund's Class A shares in comparison to the performance of funds in its Lipper performance universe over the three-year period ended December 31, 2006, which the Trustees believed was a long enough period to reflect differing market conditions. The total return performance of the Fund's Class A shares was in the 2nd quintile relative to the other funds in the universe for this three-year period (the 1st quintile being the best performers and the 5th quintile being the worst performers). The total return performance of the Fund's Class A shares was in the 1st quintile for the one-year period and the 3rd quintile for the five-year period ended December 31, 2006 relative to the Lipper performance universe. Because of the passage of time, these performance results may differ from the performance results for more recent periods, including those shown elsewhere in this report. In the course of their deliberations, the Trustees took into account information provided by MFS in connection with the contract review meetings, as well as during investment review meetings conducted with portfolio management personnel during the course of the year regarding the Fund's performance. After reviewing these and related factors, the Trustees concluded, within the context of their overall conclusions regarding the investment advisory agreement, that they were satisfied with MFS' responses and efforts relating to investment performance. In assessing the reasonableness of the Fund's advisory fee, the Trustees considered, among other information, the Fund's advisory fee and the total expense ratio of the Fund's Class A shares as a percentage of average daily net assets and the advisory fee and total expense ratios of peer groups of funds based on information provided by Lipper Inc. and MFS. The Trustees considered that there is an advisory fee reduction in effect for the Fund through February 28, 2009 as part of MFS' settlement with the New York Attorney General concerning market timing and related matters, and that MFS currently observes an expense limitation for the Fund. The Trustees also considered that, according to the Lipper data (which takes into account the advisory fee reduction and expense limitation), the Fund's effective advisory fee rate and total expense ratio were each lower than the Lipper expense group median. The Trustees also considered the advisory fees charged by MFS to institutional accounts. In comparing these fees, the Trustees considered information provided by MFS as to the generally broader scope of services provided by MFS to the Fund in comparison to institutional accounts, the higher demands placed on MFS' investment personnel and trading infrastructure as a result of the daily cash in-flows and out-flows of the Fund, and the impact on MFS and expenses associated with the more extensive regulatory regime to which the Fund is subject in comparison to institutional accounts. The Trustees also considered whether the Fund is likely to benefit from any economies of scale in the management of the Fund in the event of growth in assets of the Fund. They noted that the Fund's advisory fee rate schedule is not currently subject to any breakpoints. Taking into account the advisory fee reduction and the expense limitation noted above, the Trustees determined not to recommend any advisory fee breakpoints for the Fund at this time. The Trustees also considered information prepared by MFS relating to MFS' costs and profits with respect to the Fund, the MFS Funds considered as a group, and other investment companies and accounts advised by MFS, as well as MFS' methodologies used to determine and allocate its costs to the MFS Funds, the Fund and other accounts and products for purposes of estimating profitability. After reviewing these and other factors described herein, the Trustees concluded, within the context of their overall conclusions regarding the investment advisory agreement, that the advisory fees charged to the Fund represent reasonable compensation in light of the services being provided by MFS to the Fund. In addition, the Trustees considered MFS' resources and related efforts to continue to retain, attract and motivate capable personnel to serve the Fund. The Trustees also considered current and developing conditions in the financial services industry, including the entry into the industry of large and well-capitalized companies which are spending, and appear to be prepared to continue to spend, substantial sums to engage personnel and to provide services to competing investment companies. In this regard, the Trustees also considered the financial resources of MFS and its ultimate parent, Sun Life Financial Inc. The Trustees also considered the advantages and possible disadvantages to the Fund of having an adviser that also serves other investment companies as well as other accounts. The Trustees also considered the nature, quality, cost, and extent of administrative, transfer agency, and distribution services provided to the Fund by MFS and its affiliates under agreements and plans other than the investment advisory agreement, including any 12b-1 fees the Fund pays to MFS Fund Distributors, Inc., an affiliate of MFS. The Trustees also considered the nature, extent and quality of certain other services MFS performs or arranges for on the Fund's behalf, which may include securities lending programs, directed expense payment programs, class action recovery programs, and MFS' interaction with third-party service providers, principally custodians and sub-custodians. The Trustees concluded that the various non-advisory services provided by MFS and its affiliates on behalf of the Funds were satisfactory. The Trustees also considered benefits to MFS from the use of the Fund's portfolio brokerage commissions, if applicable, to pay for investment research (excluding third-party research, for which MFS pays directly) and various other factors. Additionally, the Trustees considered so-called "fall-out benefits" to MFS such as reputational value derived from serving as investment manager to the Fund. Based on their evaluation of factors that they deemed to be material, including those factors described above, the Board of Trustees, including a majority of the independent Trustees, concluded that the Fund's investment advisory agreement with MFS should be continued for an additional one-year period, commencing August 1, 2007. A discussion regarding the Board's most recent review and renewal of the Fund's investment advisory agreement will be available on or before November 1, 2007 by clicking on the fund's name under "Select a fund" on the MFS Web site (mfs.com). PROXY VOTING POLICIES AND INFORMATION A general description of the MFS funds' proxy voting policies and procedures is available without charge, upon request, by calling 1-800-225-2606, by visiting the Proxy Voting section of mfs.com or by visiting the SEC's Web site at http://www.sec.gov. Information regarding how the fund voted proxies relating to portfolio securities during the most recent twelve-month period ended June 30 is available without charge by visiting the Proxy Voting section of mfs.com or by visiting the SEC's Web site at http://www.sec.gov. QUARTERLY PORTFOLIO DISCLOSURE The fund will file a complete schedule of portfolio holdings with the Securities and Exchange Commission (the Commission) for the first and third quarters of each fiscal year on Form N-Q. The fund's Form N-Q may be reviewed and copied at the: Public Reference Room Securities and Exchange Commission 100 F Street, NE, Room 1580 Washington, D.C. 20549 Information on the operation of the Public Reference Room may be obtained by calling the Commission at 1-202-551-5850. The fund's Form N-Q is available on the EDGAR database on the Commission's Internet Web site at http://www.sec.gov, and copies of this information may be obtained, upon payment of a duplicating fee, by electronic request at the following e-mail address: publicinfo@sec.gov or by writing the Public Reference Section at the above address. A shareholder can also obtain the quarterly portfolio holdings report at mfs.com. CONTACT US WEB SITE MAILING ADDRESS mfs.com MFS Service Center, Inc. P.O. Box 55824 MFS TALK Boston, MA 02205-5824 1-800-637-8255 24 hours a day OVERNIGHT MAIL MFS Service Center, Inc. ACCOUNT SERVICE AND 500 Boylston Street LITERATURE Boston, MA 02116-3741 SHAREHOLDERS 1-800-225-2606 8 a.m. to 8 p.m. ET INVESTMENT PROFESSIONALS 1-800-343-2829 8 a.m. to 8 p.m. ET RETIREMENT PLAN SERVICES 1-800-637-1255 8 a.m. to 8 p.m. ET - ------------------------------------------------------------------------------- Go paperless with eDELIVERY: Arrange to have MFS(R) send prospectuses, reports, and proxies directly to your e-mail inbox. You'll get timely information and less clutter in your mailbox (not to mention help your fund save printing and postage costs). SIGN UP: If your account is registered with us, simply go to MFS.COM, log in to your account via MFS(R) Access, and select the eDelivery sign up options. If you own your MFS fund shares through a financial institution or a retirement plan, MFS(R) TALK, MFS Access, and eDelivery may not be available to you. - ------------------------------------------------------------------------------- M F S(R) INVESTMENT MANAGEMENT ITEM 2. CODE OF ETHICS. The Registrant has not amended any provision in its Code of Ethics (the "Code") that relates to any element of the Code's definition enumerated in paragraph (b) of Item 2 of this Form N-CSR. ITEM 3. AUDIT COMMITTEE FINANCIAL EXPERT. Not applicable for semi-annual reports. ITEM 4. PRINCIPAL ACCOUNTANT FEES AND SERVICES. Not applicable for semi-annual reports. ITEM 5. AUDIT COMMITTEE OF LISTED REGISTRANTS. Not applicable to the Registrant. ITEM 6. SCHEDULE OF INVESTMENTS A schedule of investments for each series of the Registrant is included as part of the report to shareholders of such series under Item 1 of this Form N-CSR. ITEM 7. DISCLOSURE OF PROXY VOTING POLICIES AND PROCEDURES FOR CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable to the Registrant. ITEM 8. PORTFOLIO MANAGERS OF CLOSED-END MANAGEMENT INVESTMENT COMPANIES. Not applicable to the Registrant. ITEM 9. PURCHASES OF EQUITY SECURITIES BY CLOSED-END MANAGEMENT INVESTMENT COMPANY AND AFFILIATED PURCHASERS. Not applicable to the Registrant. ITEM 10. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS. There were no material changes to the procedures by which shareholders may send recommendations to the Board for nominees to the Registrant's Board since the Registrant last provided disclosure as to such procedures in response to the requirements of Item 407(c)(2)(iv) of Regulation S-K (as required by Item 22(b)(15) of Schedule 14A), or this Item. ITEM 11. CONTROLS AND PROCEDURES. (a) Based upon their evaluation of the effectiveness of the registrant's disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940 (the "Act")) as conducted within 90 days of the filing date of this report on Form N-CSR, the registrant's principal financial officer and principal executive officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms. (b) There were no changes in the registrant's internal controls over financial reporting (as defined in Rule 30a-3(d) under the Act) that occurred during the second fiscal quarter of the period covered by the report that have materially affected, or are reasonably likely to materially affect, the registrant's internal control over financial reporting. ITEM 12. EXHIBITS. (a) File the exhibits listed below as part of this Form. Letter or number the exhibits in the sequence indicated. (1) 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. (2) 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): Attached hereto. (b) If the report is filed under Section 13(a) or 15(d) of the Exchange Act, provide the certifications required by Rule 30a-2(b) under the Act (17 CFR 270.30a-2(b)), Rule 13a-14(b) or Rule 15d-14(b) under the Exchange Act (17 CFR 240.13a-14(b) or 240.15d-14(b)) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. 1350) as an exhibit. A certification furnished pursuant to this paragraph will not be deemed "filed" for the purposes of Section 18 of the Exchange Act (15 U.S.C. 78r), or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference: Attached hereto. NOTICE A copy of the Amended and Restated Declaration of Trust, as amended, of the Registrant is on file with the Secretary of State of The Commonwealth of Massachusetts and notice is hereby given that this instrument is executed on behalf of the Registrant by an officer of the Registrant as an officer and not individually and the obligations of or arising out of this instrument are not binding upon any of the Trustees or shareholders individually, but are binding only upon the assets and property of the respective constituent series of the Registrant. SIGNATURES 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) MFS SERIES TRUST XIII ------------------------------------------------------------------ By (Signature and Title)* MARIA F. DWYER ----------------------------------------------------- Maria F. Dwyer, President Date: October 16, 2007 ---------------- 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)* MARIA F. DWYER ----------------------------------------------------- Maria F. Dwyer, President (Principal Executive Officer) Date: October 16, 2007 ---------------- By (Signature and Title)* TRACY ATKINSON ----------------------------------------------------- Tracy Atkinson, Treasurer (Principal Financial Officer and Accounting Officer) Date: October 16, 2007 ---------------- * Print name and title of each signing officer under his or her signature.