cover.pdf -- Converted by SECPublisher 4.0, created by BCL Technologies Inc., for SEC Filing

N-Q 1 d64371.htm MFS SERIES TRUST IX cover.pdf -- Converted by SECPublisher 4.0, created by BCL Technologies Inc., for SEC Filing

	UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549
	FORM N-Q
	QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED MANAGEMENT INVESTMENT COMPANIES

	Investment Company Act file number 811-2464

	MFS SERIES TRUST IX

	(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: April 30 and October 31*

	Date of reporting period: January 31, 2006

*	The following series of the Registrant have a fiscal year end of April 30: MFS Bond Fund, MFS Intermediate Investment Grade Bond Fund, MFS Limited Maturity Fund, MFS Municipal Limited Maturity Fund, MFS Research Bond Fund and MFS Research Bond Fund J. The remaining series of the Registrant, the MFS Inflation-Adjusted Bond Fund, has an October 31 fiscal year end.

ITEM 1. SCHEDULE OF INVESTMENTS.

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 97.1%

Advertising & Broadcasting – 0.6%

Allbritton Communications Co., 7.75%, 2012 $ 4,727,000 $ 4,738,810

News America Holdings, 7.75%, 2024 598,000 664,234

News America Holdings, 8.5%, 2025 120,000 142,226

News America, Inc., 6.2%, 2034 3,735,000 3,646,466

$ 9,191,736

Airlines – 0.2%

Continental Airlines, Inc., 6.648%, 2017 $ 3,604,422 $ 3,573,974

Alcoholic Beverages – 0.3%

Miller Brewing Co., 5.5%, 2013(a) $ 4,978,000 $ 5,008,366

Asset Backed & Securitized – 12.5%

Aesop Funding II LLC, 2.78%, 2007(a) $ 3,494,000 $ 3,446,691

AmeriCredit Automobile Receivables Trust, 3.67%, 2009 3,208,353 3,193,323

Amresco Commercial Mortgage Funding I, 7%, 2029 558,000 563,787

ARCap, REIT, Inc., "G", 6.1%, 2045(a) 2,354,000 2,134,865

ARCap, REIT, Inc., "H", 6.1%, 2045(a) 1,200,897 1,076,410

Asset Securitization Corp., 7.525%, 2029 1,077,289 1,173,451

Banc of America Commercial Mortgage, Inc., 4.857%, 2043 3,581,684 3,473,793

Banc of America Commercial Mortgage, Inc., FRN, 5.182%, 2047 4,770,000 4,749,869

Bayview Commercial Asset Trust, 0.775%, 2035(i) 50,259,194 4,205,346

Bayview Financial Acquisition Trust, FRN, 5.483% 2041 2,283,000 2,282,972

Bayview Financial Acquisition Trust, FRN, 5.402%, 2035 2,561,000 2,558,600

Bear Stearns Commercial Mortgage Securities, Inc., FRN, 5.116%, 2041 3,434,786 3,396,002

Capital One Auto Finance Trust, 4.79%, 2009 244,712 244,155

Capital One Auto Finance Trust, 3.18%, 2010 2,393,000 2,350,349

Centex Home Equity Loan Trust, 4.14%, 2028 3,939,000 3,881,049

Citigroup/Deutsche Bank Commercial Mortgage Trust, FRN, 5.2253%, 2044 4,080,000 4,079,862

Commercial Mortgage Acceptance Corp., 7.03%, 2031 3,008,000 3,161,043

CPS Auto Receivables Trust, 3.5%, 2009(a) 85,015 84,337

CPS Auto Receivables Trust, 3.52%, 2009(a) 229,177 227,745

CPS Auto Receivables Trust, 2.89%, 2009(a) 388,456 379,230

Credit Suisse First Boston Mortgage Securities Corp., 6.878%, 2018(a) 2,255,000 2,421,125

Credit-Based Asset Servicing and Securities, FRN, 5.303%, 2035 3,149,403 3,141,038

Crest G-Star CDO, 6.95%, 2032(a) 6,526,000 6,777,608

CRIIMI MAE CMBS Corp., 6.701%, 2008(a) 10,000 10,083

CRIIMI MAE Commercial Mortgage Trust, 7%, 2033(a) 1,764,282 1,789,123

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031 1,119,463 1,143,440

Deutsche Mortgage & Asset Receiving Corp., 7.5%, 2031 1,635,000 1,816,696

Drive Auto Receivables Trust, 2.5%, 2009(a) 2,314,000 2,264,892

E*TRADE RV & Marine Trust, 3.62%, 2018 994,000 952,946

Falcon Franchise Loan LLC, 7.382%, 2010(a) 1,706,902 1,768,775

Falcon Franchise Loan LLC, FRN, 3.0686%, 2023(a)(i) 630,679 73,445

Falcon Franchise Loan LLC, FRN, 3.7837%, 2025(i) 9,876,161 1,607,495

First Union National Bank Commercial Mortgage Trust, FRN, 0.9542%, 2043(a)(i) 23,411,527 929,772

First Union-Lehman Brothers Bank of America, FRN, 0.4969%, 2035(i) 25,416,936 480,172

First Union-Lehman Brothers Commercial Mortgage Trust, 7.5%, 2029 798,000 884,373

GE Capital Commercial Mortgage Corp., 6.269%, 2035 2,042,000 2,151,805

Greenwich Capital Commercial Funding Corp., FRN, 5.317%, 2036 5,908,072 5,922,101

Greenwich Capital Commercial Funding Corp., FRN, 5.224%, 2037 3,357,664 3,345,785

Greenwich Capital Commercial Funding Corp., FRN, 4.569%, 2042 5,335,000 5,159,336

Household Automotive Trust, 3.44%, 2009 895,863 887,960

IKON Receivables Funding LLC, 3.27%, 2011 1,994,000 1,970,110

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.2129%, 2041 4,431,054 4,431,031

1

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Asset Backed & Securitized – continued

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 4.936%, 2042 $ 5,061,203 $ 4,932,667

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3646%, 2043 5,666,655 5,678,948

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.038%, 2046 6,001,863 5,895,891

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4927%, 2035(i) 28,326,763 514,329

Long Beach Auto Receivables Trust, FRN, 2.841%, 2010 3,221,000 3,145,756

Morgan Stanley Capital I, Inc., 6.86%, 2010 1,157,000 1,172,556

Morgan Stanley Capital I, Inc., 7.3%, 2030(a) 3,362,000 3,475,483

Morgan Stanley Capital I, Inc., 6.48%, 2030 2,076,000 2,120,965

Morgan Stanley Capital I, Inc., FRN, 7.548%, 2030 630,000 656,445

Morgan Stanley Capital I, Inc., FRN, 1.021%, 2031(i)(a) 20,218,981 500,824

Mortgage Capital Funding, Inc., FRN, 0.7801%, 2031(i) 15,449,657 219,832

Multi-Family Capital Access One, Inc., 6.65%, 2024 1,305,499 1,343,831

Nationslink Funding Corp., FRN, 0.7187%, 2030(i) 7,927,847 134,944

New Century Home Equity Loan Trust, FRN, 4.532%, 2035 3,000,000 2,942,494

Nomura Asset Acceptance Corp., FRN, 4.423%, 2034 3,000,000 2,970,061

Popular ABS Mortgage Pass-Through Trust, FRN, 4.62%, 2035 2,038,504 2,010,978

Preferred Term Securities IV Ltd., FRN, 6.7469%, 2031(a) 2,850,000 2,892,750

Preferred Term Securities XIX Ltd., FRN, 4.8413%, 2035(a) 7,800,000 7,800,000

Prudential Securities Secured Financing Corp., FRN, 7.0486%, 2013 1,838,000 1,965,857

Residential Asset Mortgage Products, Inc., 3.878%, 2025 2,895,869 2,857,670

Residential Asset Mortgage Products, Inc., FRN, 4.9708%, 2034 2,727,000 2,658,162

Residential Funding Mortgage Securities, Inc., FRN, 5.32%, 2035 5,795,000 5,768,231

Salomon Brothers Mortgage Securities, Inc., FRN, 7.0781%, 2032(a) 3,262,500 3,597,118

SLM Student Loan Trust, 2.99%, 2022(a) 1,111,000 1,087,014

Structured Asset Securities Corp., FRN, 4.67%, 2035 4,852,858 4,799,122

Structured Asset Securities Corp., FRN, 4.77%, 2035(a) 8,064,624 8,065,517

TIAA Real Estate CDO Ltd., 7.17%, 2032(a) 808,657 826,510

Triad Auto Receivables Trust, 2.48%, 2008 353,703 352,198

Triad Auto Receivables Trust, 3.24%, 2009 780,240 772,806

Wachovia Bank Commercial Mortgage Trust, FRN, 4.847%, 2041 4,700,000 4,554,915

Wachovia Bank Commercial Mortgage Trust, FRN, 4.935%, 2042 4,100,000 3,997,120

Wachovia Bank Commercial Mortgage Trust, FRN, 5.083%, 2042 6,014,804 5,925,088

Wachovia Bank Commercial Mortgage Trust, FRN, 5.118%, 2042 4,116,878 4,062,014

Wachovia Bank Commercial Mortgage Trust, FRN, 5.155%, 2044 4,730,000 4,742,590

Wachovia Bank Commercial Mortgage Trust, FRN, 5.3164%, 2044 4,999,000 4,974,485

$ 206,007,161

Automotive – 1.3%

Ford Motor Credit Co., 5.8%, 2009 $ 2,432,000 $ 2,206,573

Ford Motor Credit Co., 7.375%, 2009 2,026,000 1,895,515

Ford Motor Credit Co., 5.7%, 2010 2,787,000 2,465,121

General Motors Acceptance Corp., 6.125%, 2008 1,668,000 1,603,719

General Motors Acceptance Corp., 6.75%, 2014 3,073,000 2,912,417

Johnson Controls, Inc., 5.5%, 2016 6,499,000 6,425,399

Lear Corp., 8.11%, 2009 4,760,000 4,379,200

$ 21,887,944

Banks & Credit Companies – 6.5%

Abbey National Capital Trust I, 8.963% to 2030, FRN to 2049 $ 3,556,000 $ 4,768,841

Banco Mercantil del Norte S.A., 5.875% to 2009, FRN to 2014(a) 4,869,000 4,832,483

Bank of America Corp., 7.4%, 2011 10,575,000 11,597,909

Barclays Bank PLC, 6.86% to 2032, FRN to 2049(a) 1,596,000 1,768,322

BNP Paribas, 5.186% to 2015, FRN to 2049(a) 5,438,000 5,225,271

Chuo Mitsui Trust & Banking Co., 5.506% to 2015, FRN to 2049(a) 5,713,000 5,551,368

Citigroup, Inc., 5.625%, 2012 2,622,000 2,683,216

2

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Banks & Credit Companies – continued

Citigroup, Inc., 5%, 2014 $ 8,856,000 $ 8,652,914

Credit Suisse First Boston (USA), Inc., 4.7%, 2009 1,885,000 1,864,339

Credit Suisse First Boston (USA), Inc., 4.875%, 2010 2,507,000 2,478,809

Credit Suisse First Boston (USA), Inc., 5.125%, 2014 805,000 794,682

DBS Capital Funding Corp., 7.657% to 2011, FRN to 2049(a) 3,015,000 3,316,666

HBOS Capital Funding LP, 6.071% to 2014, FRN to 2049(a) 3,295,000 3,372,024

J.P. Morgan Chase & Co., 5.125%, 2014 4,932,000 4,835,905

Kazkommerts International B.V., 8.5%, 2013 3,553,000 3,846,123

Mizuho Financial Group, Inc., 5.79%, 2014(a) 4,482,000 4,590,204

Natexis AMBS Co. LLC, 8.44% to 2008, FRN to 2049(a) 1,635,000 1,751,546

Popular North America, Inc., 4.25%, 2008 1,994,000 1,953,115

RBS Capital Trust II, 6.425% to 2034, FRN to 2049 3,191,000 3,317,622

Resona Bank Ltd., 5.85% to 2016, FRN to 2049(a) 3,348,000 3,327,945

Socgen Real Estate LLC, 7.64% to 2007, FRN to 2049(a) 2,349,000 2,435,340

UFJ Finance Aruba AEC, 6.75%, 2013 6,326,000 6,843,910

UniCredito Italiano Capital Trust II, 9.2% to 2010, FRN to 2049(a) 1,766,000 2,033,033

Wachovia Capital Trust III, 5.8% to 2011, FRN to 2049 8,022,000 8,046,788

Wachovia Corp., 6.605%, 2025 2,393,000 2,605,137

Wells Fargo & Co., 6.45%, 2011 4,052,000 4,305,035

$ 106,798,547

Broadcast & Cable TV – 0.9%

Comcast Corp., 5.65%, 2035 $ 2,700,000 $ 2,437,709

Rogers Cable, Inc., 5.5%, 2014 3,245,000 3,050,300

TCI Communications Financing III, 9.65%, 2027 20,000 21,562

TCI Communications, Inc., 9.8%, 2012 1,529,000 1,826,420

Time Warner Entertainment Co. LP, 8.375%, 2033 6,903,000 8,162,494

$ 15,498,485

Brokerage & Asset Managers – 1.0%

Goldman Sachs Group, Inc., 5.7%, 2012 $ 4,666,000 $ 4,754,015

Lehman Brothers Holdings, Inc., 8.25%, 2007 1,596,000 1,662,560

Merrill Lynch & Co., Inc., 5.45%, 2014 2,996,000 3,014,036

Morgan Stanley Dean Witter, Inc., 6.6%, 2012 3,101,000 3,304,171

Morgan Stanley Group, Inc., 5.3%, 2013 742,000 739,545

Morgan Stanley Group, Inc., 4.75%, 2014 2,500,000 2,378,943

$ 15,853,270

Building – 0.3%

American Standard Cos., Inc., 7.375%, 2008 $ 1,072,000 $ 1,112,959

American Standard Cos., Inc., 7.625%, 2010 3,915,000 4,188,850

$ 5,301,809

Chemicals – 0.2%

ARCO Chemical Co., 9.8%, 2020 $ 2,190,000 $ 2,447,325

Dow Chemical Co., 5.75%, 2008 775,000 791,734

$ 3,239,059

Conglomerates – 0.1%

Tyco International Group S.A., 6.75%, 2011 $ 1,351,000 $ 1,433,366

Consumer Goods & Services – 0.1%

Fortune Brands, Inc., 5.125%, 2011 $ 2,104,000 $ 2,091,679

Containers – 0.4%

Owens-Brockway Glass Container, Inc., 8.25%, 2013 $ 6,190,000 $ 6,514,975

3

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Defense Electronics – 0.7%

BAE Systems Holdings, Inc., 4.75%, 2010(a) $ 5,961,000 $ 5,832,606

BAE Systems Holdings, Inc., 6.4%, 2011(a) 5,000,000 5,259,740

$ 11,092,346

Energy - Independent – 0.6%

Apache Corp., 7.375%, 2047 $ 37,000 $ 46,890

Chesapeake Energy Corp., 6.875%, 2016 6,175,000 6,298,500

Ocean Energy, Inc., 4.375%, 2007 798,000 787,877

Ocean Energy, Inc., 7.25%, 2011 3,181,000 3,491,392

$ 10,624,659

Energy - Integrated – 0.3%

Amerada Hess Corp., 7.3%, 2031 $ 4,361,000 $ 5,071,498

Entertainment – 0.4%

Turner Broadcasting System, Inc., 8.375%, 2013 $ 399,000 $ 455,788

Walt Disney Co., 6.75%, 2006 1,073,000 1,076,393

Walt Disney Co., 6.375%, 2012 4,262,000 4,498,912

$ 6,031,093

Financial Institutions – 0.7%

American General Finance Corp., 4.875%, 2012 $ 2,033,000 $ 1,971,557

HSBC Finance Corp., 5.5%, 2016 9,552,000 9,516,810

$ 11,488,367

Food & Non-Alcoholic Beverages – 0.6%

Cadbury Schweppes PLC, 5.125%, 2013(a) $ 5,462,000 $ 5,375,083

Coca-Cola HBC Finance B.V., 5.125%, 2013 1,474,000 1,462,457

Kraft Foods, Inc., 6.25%, 2012 3,464,000 3,619,738

$ 10,457,278

Gaming & Lodging – 0.7%

Harrah's Operating Co., Inc., 5.625%, 2015 $ 5,077,000 $ 4,963,250

MGM Mirage, Inc., 5.875%, 2014 6,505,000 6,269,194

$ 11,232,444

Insurance – 1.3%

American International Group, Inc., 4.25%, 2013 $ 7,137,000 $ 6,709,722

American International Group, Inc., 5.05%, 2015(a) 4,159,000 4,050,338

ING Groep N.V., 5.775% to 2015, FRN to 2049 5,685,000 5,712,748

UnumProvident Corp., 7.625%, 2011 4,048,000 4,364,238

UnumProvident Corp., 6.85%, 2015(a) 254,000 265,016

$ 21,102,062

Insurance - Property & Casualty – 1.4%

ACE INA Holdings, Inc., 5.875%, 2014 $ 5,875,000 $ 6,030,265

AXIS Capital Holdings Ltd., 5.75%, 2014 6,305,000 6,270,417

Fund American Cos., Inc., 5.875%, 2013 5,010,000 5,013,051

St. Paul Travelers Cos., Inc., 5.5%, 2015 6,542,000 6,552,120

$ 23,865,853

Machinery & Tools – 0.3%

Case New Holland, Inc., 9.25%, 2011 $ 4,257,000 $ 4,554,990

Medical & Health Technology & Services – 0.7%

AmerisourceBergen Corp., 5.875%, 2015(a) $ 4,555,000 $ 4,611,938

HCA, Inc., 8.75%, 2010 5,665,000 6,245,906

$ 10,857,844

4

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Mortgage Backed – 11.7%

Fannie Mae, 4.55%, 2011 $ 2,395,383 $ 2,344,872

Fannie Mae, 4.79%, 2012 584,000 576,413

Fannie Mae, 5.12%, 2012 1,983,680 1,977,069

Fannie Mae, 4.543%, 2013 2,489,292 2,409,911

Fannie Mae, 4.845%, 2013 1,378,850 1,355,511

Fannie Mae, 5.78%, 2013 1,567,703 1,601,448

Fannie Mae, 4.62%, 2014 - 2015 3,644,450 3,519,134

Fannie Mae, 4.667%, 2014 1,470,852 1,429,765

Fannie Mae, 4.77%, 2014 1,687,478 1,646,944

Fannie Mae, 4.846%, 2014 3,724,679 3,659,113

Fannie Mae, 4.86%, 2014 1,717,931 1,684,787

Fannie Mae, 5.412%, 2014 1,906,717 1,957,594

Fannie Mae, 4.53%, 2015 1,191,359 1,140,982

Fannie Mae, 4.6%, 2015 1,616,928 1,556,181

Fannie Mae, 4.665%, 2015 1,272,018 1,230,848

Fannie Mae, 4.76%, 2015 1,470,225 1,428,471

Fannie Mae, 4.785%, 2015 1,721,149 1,678,192

Fannie Mae, 4.815%, 2015 1,848,000 1,804,750

Fannie Mae, 4.82%, 2015 1,592,184 1,555,451

Fannie Mae, 4.85%, 2015 1,383,773 1,355,591

Fannie Mae, 4.87%, 2015 1,305,870 1,280,758

Fannie Mae, 4.89%, 2015 361,936 355,244

Fannie Mae, 4.925%, 2015 4,472,190 4,409,557

Fannie Mae, 4.94%, 2015 2,330,000 2,308,030

Fannie Mae, 5%, 2016 - 2020 5,382,782 5,323,424

Fannie Mae, 4.996%, 2017 3,627,253 3,595,850

Fannie Mae, 5.5%, 2018 - 2036 98,304,998 97,754,340

Fannie Mae, 4.88%, 2020 1,085,984 1,076,296

Fannie Mae, 6.5%, 2031 - 2033 1,711,265 1,756,284

Fannie Mae, 6%, 2034 755,422 763,632

Freddie Mac, 5.5%, 2019 - 2035 20,917,553 20,761,275

Freddie Mac, 6%, 2033 - 2035 14,095,095 14,249,850

$ 193,216,122

Municipals – 1.4%

Metropolitan Transportation Authority Rev., NY, "A", AMBAC, 5%, 2033 $ 8,800,000 $ 9,165,728

University of Texas Permanent University Fund, "B", 5%, 2035 13,025,000 13,489,341

$ 22,655,069

Natural Gas - Distribution – 0.2%

AmeriGas Partners LP, 7.125%, 2016 $ 4,085,000 $ 4,054,363

Natural Gas - Pipeline – 1.3%

CenterPoint Energy Resources Corp., 7.875%, 2013 $ 6,931,000 $ 7,872,278

Enterprise Products Operating LP, 6.65%, 2034 4,482,000 4,621,807

Kinder Morgan Energy Partners LP, 7.75%, 2032 2,981,000 3,530,997

Kinder Morgan, Inc., 6.5%, 2012 2,614,000 2,755,391

Magellan Midstream Partners LP, 5.65%, 2016 3,272,000 3,263,899

$ 22,044,372

Network & Telecom – 1.8%

Citizens Communications Co., 9%, 2031 $ 4,034,000 $ 4,155,020

Deutsche Telekom International Finance B.V., 5.25%, 2013 621,000 611,992

Deutsche Telekom International Finance B.V., 8.25%, 2030 3,174,000 3,959,768

SBC Communications, Inc., 5.1%, 2014 5,670,000 5,497,133

5

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Network & Telecom – continued

Telecom Italia Capital, 6%, 2034 $ 4,855,000 $ 4,597,306

Telecomunicaciones de Puerto Rico, Inc., 6.65%, 2006 806,000 809,058

Telefonica Europe B.V., 7.75%, 2010 2,943,000 3,215,492

Verizon New York, Inc., 7.375%, 2032 6,371,000 6,666,022

$ 29,511,791

Oils – 0.4%

Premcor Refining Group, Inc., 7.5%, 2015 $ 6,690,000 $ 7,125,365

Pharmaceuticals – 0.4%

Teva Pharmaceutical Finance LLC, 5.55%, 2016 $ 1,936,000 $ 1,931,735

Wyeth, 5.5%, 2013 4,690,000 4,719,852

$ 6,651,587

Precious Metals & Minerals – 0.2%

Freeport-McMoRan Copper & Gold, Inc., 6.875%, 2014 $ 3,124,000 $ 3,166,955

Printing & Publishing – 0.2%

Dex Media West LLC, 9.875%, 2013 $ 3,605,000 $ 3,979,019

Railroad & Shipping – 0.6%

TFM S.A. de C.V., 9.375%, 2012 $ 2,179,000 $ 2,396,900

TFM S.A. de C.V., 12.5%, 2012 2,235,000 2,536,725

Union Pacific Corp., 7.25%, 2008 1,580,000 1,665,334

Union Pacific Corp., 6.125%, 2012 3,523,000 3,681,081

$ 10,280,040

Real Estate – 1.8%

Boston Properties, Inc., 5%, 2015 $ 3,499,000 $ 3,347,854

EOP Operating LP, 6.8%, 2009 6,465,000 6,730,763

EOP Operating LP, 4.75%, 2014 4,038,000 3,801,248

HRPT Properties Trust, 6.25%, 2016 3,389,000 3,486,962

Kimco Realty Corp., 6%, 2012 1,197,000 1,239,200

Simon Property Group LP, 6.375%, 2007 3,188,000 3,252,066

Simon Property Group LP, 4.6%, 2010 3,579,000 3,488,430

Simon Property Group LP, 5.75%, 2015(a) 1,506,000 1,518,745

Vornado Realty Trust, 5.625%, 2007 1,307,000 1,311,167

Vornado Realty Trust, 4.75%, 2010 798,000 771,771

$ 28,948,206

Restaurants – 0.1%

YUM! Brands, Inc., 8.875%, 2011 $ 2,086,000 $ 2,382,354

Retailers – 0.1%

Dollar General Corp., 8.625%, 2010 $ 1,743,000 $ 1,899,870

Supermarkets – 0.2%

Safeway, Inc., 4.95%, 2010 $ 2,201,000 $ 2,143,803

Safeway, Inc., 6.5%, 2011 1,630,000 1,688,820

$ 3,832,623

Telecommunications - Wireless – 0.6%

America Movil S.A. de C.V., 6.375%, 2035 $ 3,555,000 $ 3,420,859

Nextel Communications, Inc., 5.95%, 2014 6,045,000 6,087,895

$ 9,508,754

Tobacco – 0.6%

Altria Group, Inc., 7%, 2013 $ 3,704,000 $ 4,025,418

R.J. Reynolds Tobacco Holdings, Inc., 7.25%, 2012 5,442,000 5,578,050

$ 9,603,468

6

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Transportation - Services – 0%

FedEx Corp., 9.65%, 2012 $ 625,000 $ 768,285

U.S. Government Agencies – 4.8%

Fannie Mae, 6%, 2008 $ 7,263,000 $ 7,453,022

Fannie Mae, 6.125%, 2012 6,622,000 7,063,754

Federal Home Loan Bank, 3.25%, 2006 19,700,000 19,569,507

Freddie Mac, 4.875%, 2013 10,000,000 9,997,430

Small Business Administration, 5.34%, 2021 406,576 412,659

Small Business Administration, 6.34%, 2021 78,163 81,883

Small Business Administration, 6.35%, 2021 54,837 57,443

Small Business Administration, 6.44%, 2021 75,422 79,140

Small Business Administration, 6.07%, 2022 286,153 297,666

Small Business Administration, 4.35%, 2023 1,777,108 1,701,681

Small Business Administration, 4.89%, 2023 2,448,222 2,419,951

Small Business Administration, 4.98%, 2023 2,460,435 2,445,248

Small Business Administration, 4.34%, 2024 2,770,153 2,648,359

Small Business Administration, 4.86%, 2024 2,302,507 2,267,957

Small Business Administration, 4.93%, 2024 2,349,355 2,326,778

Small Business Administration, 5.19%, 2024 3,555,025 3,568,289

Small Business Administration, 5.52%, 2024 3,340,009 3,405,689

Small Business Administration, 4.57%, 2025 3,438,879 3,315,900

Small Business Administration, 4.76%, 2025 9,831,000 9,591,970

$ 78,704,326

U.S. Treasury Obligations – 35.6%

U.S. Treasury Bonds, 9.375%, 2006 $ 136,846,000 $ 137,081,238

U.S. Treasury Bonds, 6.25%, 2023 29,125,000 34,285,601

U.S. Treasury Bonds, 5.375%, 2031 48,915,000 53,848,518

U.S. Treasury Notes, 2%, 2006 8,489,000 8,428,983

U.S. Treasury Notes, 3.5%, 2006 6,657,000 6,600,569

U.S. Treasury Notes, 6.5%, 2006 24,955,000 25,268,884

U.S. Treasury Notes, 7%, 2006 87,076,000 87,980,807

U.S. Treasury Notes, 3%, 2007 257,000 250,294

U.S. Treasury Notes, 6.125%, 2007 23,228,000 23,766,959

U.S. Treasury Notes, 5.5%, 2008 3,868,000 3,942,339

U.S. Treasury Notes, 5.625%, 2008 89,735,000 91,873,206

U.S. Treasury Notes, 4%, 2010 525,000 514,767

U.S. Treasury Notes, 6.5%, 2010 79,367,000 85,114,917

U.S. Treasury Notes, 4.25%, 2014 3,180,000 3,110,810

U.S. Treasury Notes, 4.125%, 2015 2,921,000 2,829,149

U.S. Treasury Notes, TIPS, 2%, 2014 22,663,522 22,694,503

$ 587,591,544

Utilities - Electric Power – 3.0%

Dominion Resources, Inc., 5.95%, 2035 $ 4,800,000 $ 4,615,699

DTE Energy Co., 7.05%, 2011 4,330,000 4,645,363

Duke Capital Corp., 8%, 2019 3,307,000 3,924,285

Empresa Nacional de Electricidad S.A., 8.35%, 2013 677,000 763,244

Enersis S.A., 7.375%, 2014 4,308,000 4,594,219

Exelon Generation Co. LLC, 6.95%, 2011 6,572,000 7,051,940

FirstEnergy Corp., 6.45%, 2011 13,644,000 14,343,378

MidAmerican Energy Holdings Co., 5.875%, 2012 1,182,000 1,207,729

NRG Energy, Inc., 7.25%, 2014 4,790,000 4,855,863

Progress Energy, Inc., 5.625%, 2016 1,319,000 1,306,690

7

MFS Research Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Utilities - Electric Power – continued

Virginia Electric & Power Co., 4.1%, 2008 $ 2,258,000 $ 2,190,106

$ 49,498,516

Total Bonds $ 1,604,201,434

Short-Term Obligation – 3.1%

Alpine Securitization Corp., 4.48%, due 2/01/06(y)(t) $ 50,065,000 $ 50,065,000

Total Investments $ 1,654,266,434

Other Assets, Less Liabilities – (0.2)% (2,536,076 )

Net Assets – 100.0% $ 1,651,730,358

(a) SEC Rule 144A restriction.

(y) The rate shown represents an annualized yield at time of purchase.

(i) Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the
notional principal and does not reflect the cost of the security.

(t) Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities
Act of 1933.

The following abbreviations are used in the Portfolio of Investments and are defined:

FRN Floating Rate Note. The interest rate is the rate in effect as of period end.

TIPS Treasury Inflation Protected Security

AMBAC AMBAC Indemnity Corp.

See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual

report.

8

MFS Research Bond Fund

Supplemental Schedules (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a federal income tax basis, are as follows:

Aggregate Cost	$	1,689,996,351
Gross unrealized appreciation	$	2,884,502
Gross unrealized depreciation		(38,614,419	)
Net unrealized appreciation (depreciation)	$	(35,729,917	)

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments
Derivatives

Credit Default Swaps

Expiration	Notional Principal Amount of Contract	Description	Unrealized Appreciation (Depreciation)

3/20/11	$8,000,000	Agreement between the fund and Merrill Lynch Capital Services to exchange the credit risk of Kohls Corp. As a buyer of protection, the fund agrees to pay Merrill Lynch quarterly at a fixed annual rate of 0.42% of the notional amount of $8,000,000 until maturity on March 20, 2011. If Kohls Corp. experiences one of the following credit events: bankruptcy, failure to pay, or a restructuring, the fund would then purchase $8,000,000 par of Kohls bonds at the post credit event market price, and then deliver those bonds to Merrill Lynch, who in turn would deliver $8,000,000 in cash to the fund.	$(1,772)

At January 31, 2006, the fund had sufficient cash and/or securities to cover any commitments under these derivative contracts.

MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 99.0%

Advertising & Broadcasting – 0.5%

Allbritton Communications Co., 7.75%, 2012 $ 650,000 $ 651,625

News America Holdings, 8.5%, 2025 30,000 35,556

News America, Inc., 6.2%, 2034 489,000 477,409

$ 1,164,590

Airlines – 0.1%

Continental Airlines, Inc., 7.875%, 2018 $ 331,257 $ 311,001

Alcoholic Beverages – 0.3%

Miller Brewing Co., 5.5%, 2013(a) $ 734,000 $ 738,477

Asset Backed & Securitized – 12.5%

Aesop Funding II LLC, 2.78%, 2007(a) $ 806,000 $ 795,087

AmeriCredit Automobile Receivables Trust, 3.67%, 2009 313,078 311,611

Amresco Commercial Mortgage Funding I, 7%, 2029 142,000 143,473

ARCap, Inc., "H", 6.1%, 2045(a) 138,945 124,542

Asset Securitization Corp., 7.525%, 2029 245,761 267,698

Bank of America Commercial Mortgage, Inc., 4.857%, 2043 492,321 477,491

Bank of America Commercial Mortgage, Inc., FRN, 5.182%, 2047 657,557 654,782

Bayview Commercial Asset Trust, 0.775%, 2035(i) 7,355,004 615,417

Bayview Financial Acquisition Trust, 5.483%, 2045 307,000 306,996

Bayview Financial Acquisition Trust, FRN, 5.402%, 2045 331,000 330,690

Bear Stearns Commercial Mortgage Securities, Inc., FRN, 5.116%, 2041 401,050 396,522

Capital One Auto Finance Trust, 4.79%, 2009 61,767 61,627

Capital One Auto Finance Trust, 3.18%, 2010 607,000 596,181

Citigroup/Deutsche Bank Commercial Mortgage Trust, FRN, 5.2253%, 2020 580,000 579,980

CPS Auto Receivables Trust, 3.5%, 2009(a) 21,476 21,304

CPS Auto Receivables Trust, 3.52%, 2009(a) 58,064 57,701

CPS Auto Receivables Trust, 2.89%, 2009(a) 98,331 95,996

Credit-Based Asset Servicing and Securities, 5.303%, 2035 407,489 406,407

Crest G-Star CDO, 6.95%, 2032(a) 974,000 1,011,552

CRIIMI MAE Commercial Mortgage Trust, 7%, 2033(a) 447,087 453,382

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031 283,472 289,544

Deutsche Mortgage & Asset Receiving Corp., 7.5%, 2031 415,000 461,119

Drive Auto Receivables Trust, 2.5%, 2009(a) 586,000 573,564

E*TRADE RV & Marine Trust, 3.62%, 2018 141,000 135,176

Falcon Franchise Loan LLC, 7.382%, 2010(a) 236,479 245,051

Falcon Franchise Loan LLC, FRN, 3.0639%, 2023(a)(i) 159,646 18,591

Falcon Franchise Loan LLC, FRN, 3.7837%, 2025(i) 2,502,801 407,369

First Union National Bank Commercial Mortgage Trust, FRN, 0.9557%, 2043(a)(i) 5,933,847 235,659

First Union-Lehman Brothers Bank of America, FRN, 0.0469%, 2035(i) 6,442,394 121,708

First Union-Lehman Brothers Commercial Mortgage Trust, 7.5%, 2029 202,000 223,864

Greenwich Capital Commercial Funding Corp., FRN, 5.317%, 2036 400,000 400,950

Greenwich Capital Commercial Funding Corp., FRN, 5.224%, 2037 474,453 472,774

Greenwich Capital Commercial Funding Corp., FRN, 4.569%, 2042 400,000 386,829

Household Automotive Trust, 3.44%, 2009 226,772 224,772

IKON Receivables Funding LLC, 3.27%, 2011 506,000 499,938

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.2131%, 2041 400,000 399,998

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 4.936%, 2042 649,533 633,037

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3645%, 2043 826,928 828,722

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.038%, 2046 881,125 865,567

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4927%, 2035(i) 7,180,321 130,373

Long Beach Auto Receivables Trust, 2.841%, 2010 632,000 617,236

Morgan Stanley Capital I, Inc., 6.86%, 2010 293,000 296,940

Morgan Stanley Capital I, Inc., 7.3%, 2030(a) 500,000 516,877

1

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Asset Backed & Securitized – continued

Morgan Stanley Capital I, Inc., 6.48%, 2030 $ 507,000 $ 517,981

Morgan Stanley Capital I, Inc., FRN, 7.5481%, 2030 160,000 166,716

Morgan Stanley Capital I, Inc., FRN, 1.0209%, 2031(i)(a) 5,124,932 126,945

Mortgage Capital Funding, Inc., FRN, 0.7801%, 2031(i) 3,916,478 55,727

Multi-Family Capital Access One, Inc., 6.65%, 2024 330,995 340,714

Nationslink Funding Corp., FRN, 0.7183%, 2030(i) 2,009,289 34,201

New Century Home Equity Loan Trust, 4.532%, 2035 1,000,000 980,831

Popular ABS Mortgage Pass-Through Trust, FRN, 4.62%, 2035 242,364 239,091

Preferred Term Securities IV Ltd., 6.7469%, 2031(a) 450,000 456,750

Preferred Term Securities XIX Ltd., 4.8413%, 2035(a) 1,425,000 1,425,000

Residential Asset Mortgage Products, Inc., FRN, 4.9708%, 2034 185,000 180,330

Residential Funding Mortgage Securities, Inc., FRN, 5.32%, 2024 845,000 841,097

SLM Student Loan Trust, 2.99%, 2022(a) 282,000 275,912

Structured Asset Securities Corp., FRN, 4.77%, 2035(a) 1,190,987 1,191,119

TIAA Real Estate CDO Ltd., 7.17%, 2032(a) 205,193 209,723

Triad Auto Receivables Trust, 3.24%, 2009 197,739 195,855

Wachovia Bank Commercial Mortgage Trust, FRN, 4.847%, 2041 700,000 678,392

Wachovia Bank Commercial Mortgage Trust, FRN, 5.083%, 2042 879,362 866,246

Wachovia Bank Commercial Mortgage Trust, FRN, 4.935%, 2042 570,000 555,697

Wachovia Bank Commercial Mortgage Trust, FRN, 5.118%, 2042 565,886 558,345

Wachovia Bank Commercial Mortgage Trust, FRN, 5.1949%, 2044 677,000 673,680

Wachovia Bank Commercial Mortgage Trust, FRN, 5.3164%, 2044 670,000 671,783

$ 27,936,232

Automotive – 1.4%

Ford Motor Credit Co., 5.8%, 2009 $ 271,000 $ 245,880

Ford Motor Credit Co., 7.375%, 2009 561,000 524,869

Ford Motor Credit Co., 5.7%, 2010 136,000 120,293

General Motors Acceptance Corp., 6.125%, 2008 276,000 265,364

General Motors Acceptance Corp., 6.75%, 2014 450,000 426,485

Johnson Controls, Inc., 5.5%, 2016 900,000 889,808

Lear Corp., 8.11%, 2009 695,000 639,400

$ 3,112,099

Banks & Credit Companies – 6.7%

Abbey National Capital Trust I, 8.963% to 2030, FRN to 2049 $ 489,000 $ 655,783

Banco Mercantil del Norte S.A., 5.875% to 2009, FRN to 2014 (a) 713,000 707,653

Bank of America Corp., 7.4%, 2011 1,427,000 1,565,032

Barclays Bank PLC, 6.86% to 2032, FRN to 2049 (a) 655,000 725,721

BNP Paribas, 5.186% to 2015, FRN to 2049 (a) 772,000 741,800

Chuo Mitsui Trust & Banking Co., 5.506% to 2015, FRN to 2049 (a) 755,000 733,640

Citigroup, Inc., 5.625%, 2012 465,000 475,856

Citigroup, Inc., 5%, 2014 1,148,000 1,121,674

Credit Suisse First Boston (USA), Inc., 4.7%, 2009 303,000 299,679

Credit Suisse First Boston (USA), Inc., 4.875%, 2010 413,000 408,356

DBS Capital Funding Corp., 7.657% to 2011, FRN to 2049 (a) 338,000 371,819

HBOS Capital Funding LP, 6.071% to 2014, FRN to 2049 (a) 554,000 566,950

J.P. Morgan Chase & Co., 5.125%, 2014 544,000 533,401

Kazkommerts International B.V., 8.5%, 2013 428,000 463,310

Mizuho Financial Group, Inc., 5.79%, 2014(a) 592,000 606,292

Natexis AMBS Co. LLC, 8.44% to 2008, FRN to 2049 (a) 195,000 208,900

Popular North America, Inc., 4.25%, 2008 356,000 348,701

RBS Capital Trust II, 6.425% to 2034, FRN to 2049 556,000 578,063

Resona Bank Ltd., 5.85% to 2016, FRN to 2049 (a) 465,000 462,215

Socgen Real Estate LLC, 7.64% to 2007, FRN to 2049 (a) 323,000 334,872

2

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Banks & Credit Companies – continued

UFJ Finance Aruba AEC, 6.75%, 2013 $ 720,000 $ 778,946

UniCredito Italiano Capital Trust II, 9.2% to 2010, FRN to 2049 (a) 258,000 297,012

Wachovia Capital Trust III, 5.8% to 2011, FRN to 2049 475,000 476,468

Wachovia Corp., 6.605%, 2025 887,000 965,632

Wells Fargo & Co., 6.45%, 2011 524,000 556,722

$ 14,984,497

Broadcast & Cable TV – 1.0%

Comcast Corp., 5.65%, 2035 $ 370,000 $ 334,056

Rogers Cable, Inc., 5.5%, 2014 464,000 436,160

TCI Communications Financing III, 9.65%, 2027 5,000 5,390

TCI Communications, Inc., 9.8%, 2012 181,000 216,208

Time Warner Entertainment Co., LP, 8.375%, 2033 997,000 1,178,909

$ 2,170,723

Brokerage & Asset Managers – 1.0%

Goldman Sachs Group, Inc., 5.7%, 2012 $ 523,000 $ 532,865

Lehman Brothers Holdings, Inc., 8.25%, 2007 404,000 420,848

Merrill Lynch & Co., Inc., 5.45%, 2014 450,000 452,709

Morgan Stanley Dean Witter, Inc., 6.6%, 2012 424,000 451,780

Morgan Stanley Group, Inc., 5.3%, 2013 188,000 187,378

Morgan Stanley Group, Inc., 4.75%, 2014 282,000 268,345

$ 2,313,925

Building – 0.1%

American Standard Cos., Inc., 7.375%, 2008 $ 3,000 $ 3,115

American Standard Cos., Inc., 7.625%, 2010 100,000 106,995

$ 110,110

Chemicals – 0.1%

ARCO Chemical Co., 9.8%, 2020 $ 235,000 $ 262,613

Conglomerates – 0.1%

Tyco International Group S.A., 6.75%, 2011 $ 187,000 $ 198,401

Consumer Goods & Services – 0.1%

Fortune Brands, Inc., 5.125%, 2011 $ 293,000 $ 291,284

Containers – 0.4%

Owens-Brockway Glass Container, Inc., 8.25%, 2013 $ 855,000 $ 899,888

Defense Electronics – 0.7%

BAE Systems Holdings, Inc., 4.75%, 2010(a) $ 902,000 $ 882,572

BAE Systems Holdings, Inc., 6.4%, 2011(a) 622,000 654,312

$ 1,536,884

Energy - Independent – 0.7%

Apache Corp., 7.375%, 2047 $ 10,000 $ 12,673

Chesapeake Energy Corp., 6.875%, 2016 875,000 892,500

Ocean Energy, Inc., 4.375%, 2007 202,000 199,437

Ocean Energy, Inc., 7.25%, 2011 462,000 507,081

$ 1,611,691

Energy - Integrated – 0.3%

Amerada Hess Corp., 7.3%, 2031 $ 598,000 $ 695,427

Entertainment – 0.4%

Turner Broadcasting System, Inc., 8.375%, 2013 $ 101,000 $ 115,375

Walt Disney Co., 6.75%, 2006 155,000 155,490

3

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Entertainment – continued

Walt Disney Co., 6.375%, 2012 $ 628,000 $ 662,909

$ 933,774

Financial Institutions – 0.7%

American General Finance Corp., 4.875%, 2012 $ 281,000 $ 272,507

HSBC Finance Corp., 5.5%, 2016 1,340,000 1,335,063

$ 1,607,570

Food & Non-Alcoholic Beverages – 0.7%

Cadbury Schweppes PLC, 5.125%, 2013(a) $ 804,000 $ 791,206

Coca-Cola HBC Finance B.V., 5.125%, 2013 150,000 148,825

Kraft Foods, Inc., 6.25%, 2012 501,000 523,524

$ 1,463,555

Gaming & Lodging – 0.7%

Harrah's Operating Co., Inc., 5.625%, 2015 $ 756,000 $ 739,062

MGM Mirage, Inc., 5.875%, 2014 935,000 901,106

$ 1,640,168

Insurance – 1.4%

American International Group, Inc., 4.25%, 2013 $ 1,055,000 $ 991,839

American International Group, Inc., 5.05%, 2015(a) 610,000 594,063

ING Groep N.V., 5.775% to 2015, FRN to 2049 808,000 811,944

UnumProvident Corp., 7.625%, 2011 593,000 639,326

UnumProvident Corp., 6.85%, 2015(a) 36,000 37,561

$ 3,074,733

Insurance - Property & Casualty – 1.6%

ACE INA Holdings, Inc., 5.875%, 2014 $ 860,000 $ 882,728

AXIS Capital Holdings Ltd., 5.75%, 2014 920,000 914,954

Fund American Cos., Inc., 5.875%, 2013 735,000 735,448

St. Paul Travelers Cos., Inc., 5.5%, 2015 931,000 932,440

$ 3,465,570

Machinery & Tools – 0.3%

Case New Holland, Inc., 9.25%, 2011 $ 625,000 $ 668,750

Medical & Health Technology & Services – 0.7%

AmerisourceBergen Corp., 5.875%, 2015(a) $ 720,000 $ 729,000

HCA, Inc., 8.75%, 2010 810,000 893,060

$ 1,622,060

Mortgage Backed – 12.0%

Fannie Mae, 4.55%, 2011 $ 351,244 $ 343,837

Fannie Mae, 5.12%, 2012 290,609 289,641

Fannie Mae, 4.79%, 2012 83,000 81,922

Fannie Mae, 3.81%, 2013 87,419 81,093

Fannie Mae, 5.78%, 2013 169,139 172,780

Fannie Mae, 4.667%, 2014 671,230 652,480

Fannie Mae, 4.518%, 2014 322,035 310,150

Fannie Mae, 4.77%, 2014 247,457 241,513

Fannie Mae, 4.62%, 2014 185,222 178,940

Fannie Mae, 4.86%, 2014 185,347 181,771

Fannie Mae, 4.69%, 2015 133,334 129,257

Fannie Mae, 4.85%, 2015 178,085 174,458

Fannie Mae, 4.56%, 2015 237,413 228,115

Fannie Mae, 4.665%, 2015 159,485 154,323

Fannie Mae, 4.7%, 2015 183,989 178,439

4

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Mortgage Backed – continued

Fannie Mae, 4.89%, 2015 $ 183,490 $ 180,189

Fannie Mae, 4.74%, 2015 200,000 194,437

Fannie Mae, 4.87%, 2015 180,722 177,246

Fannie Mae, 4.925%, 2015 507,513 500,405

Fannie Mae, 4.785%, 2015 253,110 246,793

Fannie Mae, 4.815%, 2015 271,000 264,658

Fannie Mae, 4.53%, 2015 151,157 144,766

Fannie Mae, 4.6%, 2015 200,873 193,326

Fannie Mae, 4.94%, 2015 336,000 332,832

Fannie Mae, 4.82%, 2015 233,998 228,600

Fannie Mae, 5%, 2016 - 2020 304,225 300,825

Fannie Mae, 4.996%, 2017 844,703 837,390

Fannie Mae, 5.5%, 2018 - 2035 13,249,921 13,169,166

Fannie Mae, 4.88%, 2020 192,550 190,833

Fannie Mae, 6.5%, 2033 242,198 248,376

Fannie Mae, 6%, 2034 197,067 199,208

Freddie Mac, 5%, 2018 - 2020 889,022 879,908

Freddie Mac, 5.5%, 2019 - 2035 3,154,431 3,131,745

Freddie Mac, 6%, 2034 - 2035 1,970,077 1,991,867

$ 26,811,289

Municipals – 1.3%

Metropolitan Transportation Authority Rev., NY, "A", AMBAC, 5%, 2033 $ 1,115,000 $ 1,161,339

University of Texas Permanent University Fund, "B", 5%, 2035 1,650,000 1,708,823

$ 2,870,162

Natural Gas - Distribution – 0.3%

AmeriGas Partners LP, 7.125%, 2016 $ 560,000 $ 555,800

Natural Gas - Pipeline – 1.4%

CenterPoint Energy Resources Corp., 7.875%, 2013 $ 917,000 $ 1,041,535

Enterprise Products Operating LP, 6.65%, 2034 670,000 690,899

Kinder Morgan Energy Partners LP, 7.75%, 2032 491,000 581,590

Kinder Morgan, Inc., 6.5%, 2012 414,000 436,393

Magellan Midstream Partners LP, 5.65%, 2016 333,000 332,175

$ 3,082,592

Network & Telecom – 2.0%

Citizens Communications Co., 9%, 2031 $ 598,000 $ 615,940

Deutsche Telekom International Finance B.V., 8.25%, 2030 431,000 537,700

SBC Communications, Inc., 5.1%, 2014 830,000 804,695

Telecom Italia Capital, 6%, 2034 700,000 662,845

Telecomunicaciones de Puerto Rico, Inc., 6.65%, 2006 104,000 104,395

Telefonica Europe B.V., 7.75%, 2010 400,000 437,036

Verizon New York, Inc., 7.375%, 2032 1,238,000 1,295,328

$ 4,457,939

Oils – 0.5%

Premcor Refining Group, Inc., 7.5%, 2015 $ 1,000,000 $ 1,065,077

Pharmaceuticals – 0.4%

Teva Pharmaceutical Finance LLC, 5.55%, 2016 $ 270,000 $ 269,405

Wyeth, 5.25%, 2013 663,000 667,220

$ 936,625

Precious Metals & Minerals – 0.2%

Freeport-McMoRan Copper & Gold, Inc., 6.875%, 2014 $ 448,000 $ 454,160

5

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Printing & Publishing – 0.3%

Dex Media West LLC, 9.875%, 2013 $ 550,000 $ 607,063

Railroad & Shipping – 0.6%

TFM S.A. de C.V., 9.375%, 2012 $ 326,000 $ 358,600

TFM S.A. de C.V., 12.5%, 2012 380,000 431,300

Union Pacific Corp., 7.25%, 2008 175,000 184,452

Union Pacific Corp., 6.125%, 2012 343,000 358,391

$ 1,332,743

Real Estate – 1.8%

Boston Properties, Inc., 5%, 2015 $ 488,000 $ 466,920

EOP Operating LP, 6.8%, 2009 862,000 897,435

EOP Operating LP, 4.75%, 2014 578,000 544,111

HRPT Properties Trust, 6.25%, 2016 452,000 465,066

Kimco Realty Corp., 6%, 2012 150,000 155,288

Simon Property Group LP, 6.375%, 2007 345,000 351,933

Simon Property Group LP, 4.6%, 2010 517,000 503,917

Simon Property Group LP, 5.75%, 2015(a) 331,000 333,801

Vornado Realty Trust, 5.625%, 2007 200,000 200,638

$ 3,919,109

Restaurants – 0.1%

YUM! Brands, Inc., 8.875%, 2011 $ 267,000 $ 304,932

Retailers – 0.1%

Dollar General Corp., 8.625%, 2010 $ 262,000 $ 285,580

Supermarkets – 0.2%

Safeway, Inc., 4.95%, 2010 $ 309,000 $ 300,970

Safeway, Inc., 6.5%, 2011 227,000 235,192

$ 536,162

Telecommunications - Wireless – 0.6%

America Movil S.A. de C.V., 6.375%, 2035 $ 521,000 $ 501,341

Nextel Communications, Inc., 5.95%, 2014 885,000 891,280

$ 1,392,621

Tobacco – 0.6%

Altria Group, Inc., 7%, 2013 $ 519,000 $ 564,037

R.J. Reynolds Tobacco Holdings, Inc., 7.25%, 2012 805,000 825,125

$ 1,389,162

Transportation - Services – 0.1%

FedEx Corp., 9.65%, 2012 $ 83,000 $ 102,028

U.S. Government Agencies – 3.3%

Fannie Mae, 6%, 2008 $ 895,000 $ 918,416

Fannie Mae, 6.125%, 2012 1,208,000 1,288,586

Small Business Administration, 6.35%, 2021 13,709 14,361

Small Business Administration, 6.34%, 2021 19,541 20,471

Small Business Administration, 6.44%, 2021 18,856 19,785

Small Business Administration, 5.34%, 2021 103,344 104,890

Small Business Administration, 6.07%, 2022 72,435 75,349

Small Business Administration, 4.35%, 2023 450,465 431,345

Small Business Administration, 4.98%, 2023 624,181 620,329

Small Business Administration, 4.89%, 2023 621,056 613,885

Small Business Administration, 4.93%, 2024 571,018 565,530

Small Business Administration, 4.34%, 2024 570,627 545,539

Small Business Administration, 5.52%, 2024 552,531 563,396

6

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

U.S. Government Agencies – continued

Small Business Administration, 5.19%, 2024 $ 555,218 $ 557,289

Small Business Administration, 4.86%, 2024 292,908 288,513

Small Business Administration, 4.76%, 2025 707,000 689,810

$ 7,317,494

U.S. Treasury Obligations – 37.5%

U.S. Treasury Bonds, 9.375%, 2006 $ 10,014,000 $ 10,031,214

U.S. Treasury Bonds, 8.125%, 2019 5,000 6,696

U.S. Treasury Bonds, 6.25%, 2023 3,733,000 4,394,443

U.S. Treasury Bonds, 6.25%, 2030 375,000 457,310

U.S. Treasury Bonds, 5.375%, 2031 4,179,000 4,600,490

U.S. Treasury Notes, 2%, 2006 241,000 239,296

U.S. Treasury Notes, 7%, 2006 17,465,000 17,646,479

U.S. Treasury Notes, 6.5%, 2006 395,000 399,968

U.S. Treasury Notes, 3.5%, 2006 293,000 290,516

U.S. Treasury Notes, 6.125%, 2007 10,628,000 10,874,601

U.S. Treasury Notes, 5.5%, 2008 619,000 630,897

U.S. Treasury Notes, 5.625%, 2008 15,239,000 15,602,115

U.S. Treasury Notes, 6.5%, 2010 13,587,000 14,570,998

U.S. Treasury Notes, 4%, 2015 387,000 371,520

U.S. Treasury Notes, 4.125%, 2015 400,000 387,422

U.S. Treasury Notes, TIPS, 2%, 2014 3,326,736 3,331,284

$ 83,835,249

Utilities - Electric Power – 3.2%

Dominion Resources, Inc., 5.95%, 2035 $ 700,000 $ 673,123

DTE Energy Co., 7.05%, 2011 575,000 616,878

Duke Capital Corp., 8%, 2019 394,000 467,544

Empresa Nacional de Electricidad S.A., 8.35%, 2013 78,000 87,937

Enersis S.A., 7.375%, 2014 630,000 671,857

Exelon Generation Co. LLC, 6.95%, 2011 971,000 1,041,910

FirstEnergy Corp., 6.45%, 2011 2,039,000 2,143,517

MidAmerican Energy Holdings Co., 5.875%, 2012 150,000 153,265

NRG Energy, Inc., 7.25%, 2014 690,000 699,488

Progress Energy, Inc., 5.625%, 2016 184,000 182,283

Virginia Electric & Power Co., 4.1%, 2008 346,000 335,587

$ 7,073,389

Total Bonds $ 221,143,198

Short-Term Obligation – 1.0%

Alpine Securitization Corp., 4.48%, due 2/01/06(y)(t) $ 2,320,000 $ 2,320,000

Total Investments $ 223,463,198

Other Assets, Less Liabilities – 0% (50,929 )

Net Assets – 100.0% $ 223,412,269

(a)   SEC Rule 144A restriction.

(y)   The rate shown represents an annualized yield at time of purchase.

(i)   Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the notional principal and does not reflect the cost of the security.

(t)   Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities Act of 1933.

The following abbreviations are used in the Portfolio of Investments and are defined:

FRN Floating Rate Note. The interest rate is the rate in effect as of period end.

TIPS Treasury Inflation Protected Security

7

MFS Research Bond Fund J

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Insurer

AMBAC AMBAC Indemnity Corp.

See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual

report.

8

MFS Research Bond Fund J

Supplemental Schedules (Unaudited) 1/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a federal income tax basis, are as follows:

Aggregate Cost	$	228,269,982
Gross unrealized appreciation	$	398,214
Gross unrealized depreciation		(5,204,998	)
Net unrealized appreciation (depreciation)	$	(4,806,784	)

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments

Credit Default Swaps

	Notional Principal		Unrealized
	Amount of		Appreciation
Expiration	Contract	Description	(Depreciation)

3/20/2011	$1,125,000	Agreement between the fund and Merrill Lynch Capital Services to	$(171)
		exchange the credit risk of Kohls Corp. As a buyer of protection, the
		fund agrees o pay Merrill Lynch quarterly at a fixed annual rate of
		0.42% of the notional amount of $1,125,000 until maturity on March
		20, 2011. If Kohls Corp. experiences one of the following credit vents;
		bankruptcy, failure to pay, or a restructuring, the fund would then
		purchase $1,125,000 par of Kohls Corp. bonds at the post credit event
		market price, and then deliver those bonds to Merrill Lynch, ho in turn
		would deliver $1,125,000 in cash to the fund.

MFS Investment Management®

MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Municipal Bonds – 98.2%

Airport & Port Revenue – 6.4%

Atlanta, GA, Airport Rev., "A", FSA, 5.375%, 2015 $ 1,000,000 $ 1,083,240

Chicago IL, (O'Hare International Airport), "A", MBIA, 5%, 2009 1,995,000 2,079,329

Chicago, IL (O'Hare International Airport), "A-2", FSA, 5.25%, 2013 1,500,000 1,598,205

Cleveland, OH, Airport Systems Rev., "A", FSA, 5.5%, 2008 250,000 258,455

Dallas Fort Worth, TX, International Airport, "A", AMBAC, 6%, 2013 1,000,000 1,117,880

Delaware River Port Authority Pennsylvania & New Jersey Refunding (Port District

Project), "A", FSA, 5.25%, 2009 550,000 579,518

Denver, CO, City & County Airport Rev., "C", MBIA, 6%, 2006 1,000,000 1,019,480

Houston, TX, Airport Systems Rev.,"B", FGIC, 5.25%, 2015 1,250,000 1,303,050

Long Beach, CA, Harbor Rev., "A", FGIC, 5%, 2015 1,000,000 1,058,290

Massachusetts Port Authority Rev., "A", 5.25%, 2007 375,000 383,321

Massachusetts Port Authority Rev., "A", 5.75%, 2010 175,000 190,586

Minneapolis & St. Paul, MN, Metropolitan Airport, "D", FGIC, 5.25%, 2009 500,000 522,450

New York, NY, (Industrial Development Agency Terminal One Group Assn.), 5.5%,

2014 1,000,000 1,069,330

Port Seattle, WA, Rev., "B", FGIC, 5.5%, 2007 500,000 511,255

Rhode Island Economic Development Corp. Airport Rev., "A", FGIC, 5%, 2012 750,000 793,320

Richland Lexington, SC, Columbia Metropolitan Airport Rev., "A", FSA, 5%, 2009 200,000 208,454

Wayne Charter County, MI, Airport Rev., Refunding Detroit Metropolitan, "D", FGIC,

5.25%, 2006 1,000,000 1,014,350

$ 14,790,513

General Obligations - General Purpose – 15.1%

Allen County, IN (Jail Building Corp.), ETM, 5.75%, 2009(c) $ 235,000 $ 253,511

Broward County, FL, "B", 5%, 2008 500,000 515,135

Chicago, IL, Neighborhoods Alive, "A", MBIA, 5%, 2008 1,250,000 1,287,137

Chicago, IL, Park District, 5%, 2008 2,470,000 2,541,531

Columbus, OH, 5.25%, 2011 705,000 760,201

Commonwealth of Massachusetts, "A", 6%, 2010(c) 310,000 340,991

Du Page County, IL (ARS Jail Project), 5%, 2009 870,000 908,002

Hawkins County, TN, AMBAC, 4.5%, 2008 425,000 435,463

Henderson, NV, Parks & Recreation, "A", FGIC, 6%, 2006 340,000 343,040

Huntsville, AL, "D", 5%, 2008 350,000 364,070

King County, WA, "B", 4.75%, 2009 1,500,000 1,550,055

Kingsport, TN, "A", FGIC, 4%, 2008 1,000,000 1,012,100

Lansing, IL, "A", FSA, 4.25%, 2007 530,000 536,328

Milwaukee County, WI, "A", 4.75%, 2007 1,000,000 1,021,930

Missouri, Third State Building, "A", 5%, 2007 2,000,000 2,051,540

New York, NY, "A", 5.25%, 2012 265,000 285,500

New York, NY, "B", 5.75%, 2011 375,000 408,765

New York, NY, "C", 5.25%, 2009 250,000 263,430

New York, NY, "G", 5.5%, 2009 780,000 828,251

New York, NY, "J", 5%, 2010 1,000,000 1,053,130

New York, NY, "K", 5%, 2010 370,000 389,384

New York, NY, "N", 5%, 2013 1,030,000 1,101,637

Oakland, CA, "A", FGIC, 5%, 2010 820,000 869,659

Pawtucket, RI, "A", AMBAC, 5%, 2009 1,000,000 1,049,630

Philadelphia, PA, "A", XLCA, 5%, 2011 1,000,000 1,065,810

Saraland, AL, Warrants, MBIA, 4.5%, 2009 865,000 891,867

St. Clair County, IL, FGIC, 5.625%, 2012 500,000 543,010

State of California, 5%, 2011 2,250,000 2,389,657

State of California, 5%, 2012 1,150,000 1,227,809

State of California, FSA, 5.25%, 2010 2,000,000 2,137,100

State of Hawaii, "CY", FSA, 5.25%, 2008 500,000 517,690

1

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

General Obligations - General Purpose – continued

Commonwealth of Massachusetts, Consolidated Loan, "A", 5%, 2016 $ 1,000,000 $ 1,077,040

State of Tennessee, "A", FGIC, 5.25%, 2008 500,000 518,280

State of Washington, "B", FSA, 5%, 2008 500,000 514,855

State of Washington, "R", 5.375%, 2007 750,000 774,548

State of Wisconsin, 5.125%, 2011 400,000 429,660

State of Wisconsin, "1", MBIA, 5%, 2017 500,000 535,515

State of Wisconsin, "C", FSA, 5%, 2010 1,000,000 1,058,630

Taylor, MI, Building Authority, AMBAC, 5.5%, 2010 500,000 539,255

Titus County, TX, Hospital District, FGIC, 5%, 2013 510,000 547,684

$ 34,938,830

General Obligations - Improvement – 1.8%

Kauai County, HI, "A", FGIC, 6.25%, 2010(c) $ 375,000 $ 418,204

Montgomery, AL, AMBAC, 5%, 2011 1,000,000 1,066,800

New Orleans, LA, Certificate Indebtedness, FSA, 5.5%, 2010 500,000 539,200

Oak Ridge, TN, AMBAC, 5%, 2012 300,000 317,577

Springfield, MA, State Qualified, MBIA, 5%, 2011 1,000,000 1,064,810

State of Mississippi, "I", ETM, 5.5%, 2006(c) 250,000 254,090

State of Mississippi, ETM, 6.2%, 2008(c) 420,000 439,677

$ 4,100,358

General Obligations - Schools – 9.0%

Birdville, TX, Independent School District, "A", PSF, 4.25%, 2008 $ 500,000 $ 508,375

Bloomington, MN, Independent School District, "B", 5.25%, 2011 500,000 531,780

Byron Center, MI, Public Schools, Q-SBLF, 5%, 2011 600,000 639,198

Cincinnati, OH, City School District, FSA, 4.5%, 2006 500,000 502,050

Clackamas County, OR, School District, 6%, 2010(c) 315,000 347,555

Cook County, IL, Community Consolidated School, FSA, 0%, 2008 500,000 453,400

Cook County, IL, School District Number 135, "A", MBIA, 3.25%, 2006 500,000 500,030

Cypress Fairbanks, TX, Independent School District, PSF, 5%, 2008 500,000 515,680

Cypress Fairbanks, TX, Independent School District, PSF, 5%, 2019 500,000 526,680

Deer Park, TX, Independent School District, PSF, 0%, 2009 1,000,000 894,220

DeSoto, TX, Independent School District School Building, "N", PSF, 0%, 2021 3,860,000 1,819,758

Detroit, MI, City School District (School Building & Site Improvement), "B", FGIC, 5%,

2010 1,000,000 1,061,880

Dodge, KS, Unified School District Number 443, FGIC, 4%, 2006 500,000 500,330

Fayette County, GA, School District, FSA, 0% to 2010, 4.15% to 2014 710,000 583,329

Fayette County, GA, School District, FSA, 0% to 2010, 4.35% to 2016 355,000 292,066

Ferndale, MI, School District, Q-SBLF, 5.5%, 2013 1,115,000 1,211,325

Hall County, GA, School District, 4.5%, 2007 1,540,000 1,561,344

Manistee, MI, Public Schools, FGIC, 5.15%, 2009(c) 100,000 105,454

Midlothian, TX, Independent School District, "A", PSF, 4.4%, 2007 700,000 707,609

North Lawrence, IN (First Mortgage), FSA, 5%, 2008 500,000 514,470

Northside Texas Independent School District, PSF, 5.5%, 2016 850,000 917,643

Norwin, PA, School District, FGIC, 6%, 2010(c) 250,000 273,183

Oconto Falls, WI, Public School District, "B", FSA, 5.25%, 2007 500,000 510,335

Plymouth Canton, MI, Community School, Q-SBLF, 5%, 2011 500,000 532,665

Round Rock, TX, Independent School District, PSF, 6.5%, 2010(c) 500,000 562,765

Round Rock, TX, Independent School District, PSF, 5.375%, 2012 570,000 624,327

State of Florida, Board of Education, Lottery Rev., "B", FGIC, 5.5%, 2010(c) 150,000 163,896

State of South Carolina, "A", 5.75%, 2007 500,000 511,160

Tuscaloosa, AL, 5%, 2007 465,000 472,914

United Independent School District TX, Capital Appreciation, PSF, 0%, 2017 545,000 318,689

Vidor, TX, Independent School District, PSF, 5.875%, 2007 410,000 420,549

Wallenpaupack, PA, Area School District, "N", FGIC, 5.5%, 2008 1,340,000 1,396,776

2

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

General Obligations - Schools – continued

Westerville, OH, City School District, MBIA, 5.5%, 2011(c) $ 300,000 $ 328,611

$ 20,810,046

Healthcare Revenue - Hospitals – 12.0%

Blair County, PA, Hospital Authority Rev. (Altoona Hospital), "A", AMBAC,

5.375%, 2006 $ 460,000 $ 463,878

California Health Facilities Financing Authority Rev. (Catholic Healthcare West), "I",

4.95%, 2026 3,000,000 3,134,160

California Statewide Community Development Authority (Kaiser Permanente), "D",

4.35%, 2036 600,000 605,016

Colorado Health Facilities Authority Rev. (Catholic Health Initiatives), "A", 5%, 2008 500,000 515,805

Colorado Health Facilities Authority Rev. (Parkview Medical Center), 5%, 2010 550,000 569,525

Colorado Health Facilities Authority Rev. (Parkview Medical Center), 5%, 2011 575,000 595,907

Comal County, TX, Health Facilities Development, Health Care Systems (McKenna

Memorial), "A", 4%, 2006 170,000 170,000

DCH Health Care Authority, AL, Facilities Rev., 4%, 2008 500,000 506,530

Denver, CO, Health & Hospital Rev., "A", 5.125%, 2006 200,000 201,558

Hillsborough County, FL, Industrial Development Authority Hospital Rev. (Tampa

General Hospital ), "A", 5%, 2007 500,000 510,355

Illinois Health Facilities Authority Rev. (Children's Memorial Hospital), "A", AMBAC,

5.75%, 2009(c) 250,000 271,707

Illinois Health Facilities Authority Rev. (Sherman Health Systems), AMBAC,

5.5%, 2007 440,000 453,156

Indiana Health Facility Financing Authority Rev. (Ascension Health), "F", 5.5%, 2008 500,000 526,545

Indiana Health Facility Financing Authority Rev. (Holy Cross Health Systems Corp.),

MBIA, 5.375%, 2008 1,000,000 1,050,560

Iowa Finance Authority Health Care Facilities (Genesis Medical Center), 6%, 2010 210,000 227,617

Joplin, MO, Industrial Development Authority Health Facilities Rev. (Freeman Health

Systems), 5.5%, 2013 700,000 747,005

Kent, MI, Hospital Finance Authority Rev. (Spectrum Health), "A", 5.25%, 2009 750,000 782,407

Kentucky Economic Development Finance Authority (Norton Healthcare, Inc.), "A",

6.125%, 2010 180,000 189,284

Lakewood, OH, Hospital Improvement Rev. (Lakewood Hospital Assn.), 5.5%, 2009 1,000,000 1,044,180

Martin County, FL, Health Facilities Authority Hospital Rev. (Martin Memorial Medical

Center), "B", 5.25%, 2008 800,000 826,472

Massachusetts Development Finance Agency (Massachusetts Biomedical Research

Corp.), "C", 5.75%, 2006 260,000 262,561

Massachusetts Health & Educational Facilities Authority Rev. (Baystate Medical

Center), "F", 5%, 2009 235,000 242,417

Massachusetts Health & Educational Facilities Authority Rev. (Covenant Health

System), 5%, 2007 80,000 81,139

Massachusetts Health & Educational Facilities Authority Rev. (Jordan Hospital), "D",

4.8%, 2006 600,000 599,496

Michigan Hospital Finance Authority Rev. (Genesys Health System), "A", ETM,

5.5%, 2007 (c) 750,000 777,405

Mississippi Hospital Equipment & Facilities Authority Rev. (Southwest Mississippi

Regional Medical Center), 5%, 2014 500,000 515,165

Montgomery, AL, Special Care Facilities, Financing Authority Rev. (Baptist Health),

"A-2 ", MBIA, 0% to 2007, 5% to 2014(c) 2,540,000 2,513,914

New Hampshire Health & Education Facilities (Catholic Medical Center), "A",

3.6%, 2006 250,000 249,360

New Hampshire Health & Education Facilities (Covenant Health), 5%, 2014 1,030,000 1,071,252

New Hampshire Health & Education Facilities (Exeter Hospital), 4.6%, 2007 395,000 398,689

Oklahoma State Development Finance Authority (Unity Health Center), 5%, 2013 875,000 908,206

3

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Healthcare Revenue - Hospitals – continued

Philadelphia, PA, Hospital & High Education (Children's Hospital), "E", MBIA,

5%, 2032 $ 750,000 $ 765,023

Rhode Island Health & Education Building, Hospital Financing (Lifespan Obligated

Group), 5.75%, 2010 250,000 266,053

Scranton-Lackawanna, PA, Health & Welfare (Community Medical Center), MBIA,

5.25%, 2006 935,000 942,415

Spartanburg County, SC, Health Service, "B", MBIA, 6%, 2007 675,000 695,750

Springfield, TN, Health & Higher Educational Facilities Hospital Rev. (Northcrest

Medical Center), 5.25%, 2013 485,000 495,423

St. Cloud, MN, Health Care Rev. (St. Cloud Hospital), "A", FSA, 5.5%, 2006 260,000 261,209

Steubenville, OH Hospital Rev. (Trinity Hospital), 5.7%, 2010 220,000 237,376

Tyler, TX, Health Facilities Development Corp. (Mother Frances Hospital), 4.5%, 2006 500,000 501,325

Tyler, TX, Health Facilities Development Corp. (Mother Frances Hospital), 5%, 2007 500,000 507,120

Waco, TX, Health Facilities Development Corp. (Ascension Health), "A", 5.5%, 2009 250,000 266,738

Wisconsin Health & Educational Facilities Authority Rev. (Agnesian Healthcare, Inc.),

5%, 2006 65,000 65,253

Wisconsin Health & Educational Facilities Authority Rev. (Fort Healthcare, Inc.),

5.25%, 2012 610,000 637,664

Wisconsin Health & Educational Facilities Authority Rev. (Fort Healthcare, Inc.),

5.25%, 2013 645,000 674,173

Wisconsin Health & Educational Facilities Authority Rev. (Wheaton Franciscan

Services), 5%, 2007 260,000 264,716

$ 27,591,509

Healthcare Revenue - Long Term Care – 0.3%

Colorado Health Facilities Authority Rev. (Evangelical Lutheran), "B", 3.75%, 2034 $ 735,000 $ 725,577

Industrial Revenue - Airlines – 0%

Massachusetts Port Authority Rev. (U.S. Airways), MBIA, 5%, 2006 $ 50,000 $ 50,356

Industrial Revenue - Chemicals – 0.3%

Brazos River, TX, Harbor Navigation District (Dow Chemical Co.), "B-2", 4.75%, 2033 $ 330,000 $ 334,452

Michigan Strategic Fund Limited Rev. (Dow Chemical Co.), 4.6%, 2014 350,000 356,713

$ 691,165

Industrial Revenue - Environmental Services – 1.4%

California Statewide Community Development Authority, Solid Waste Facilities Rev.

(Republic Services, Inc.), "A", 4.95%, 2012 $ 250,000 $ 258,765

Michigan Solid Waste Disposal Rev., (Waste Management), 4.5%, 2013 1,000,000 999,940

New Jersey Economic Development Authority (Waste Management, Inc.) "A",

5.3%, 2015 1,000,000 1,048,610

State of Ohio Solid Waste Rev. (Republic Services), 4.25%, 2033 1,000,000 977,020

$ 3,284,335

Industrial Revenue - Other – 1.7%

Cartersville, GA, Development Authority Rev. (Anheuser Busch), 5.1%, 2012 $ 375,000 $ 396,791

Corpus Christi, TX, Nueces County General Rev. (Union Pacific Corp.), 5.35%, 2010 610,000 618,656

Fort Bend County, TX, Industrial Development (Frito Lay, Inc.), 3.5%, 2011 1,000,000 997,450

Indianapolis, IN, Airport Authority Rev., Special Facilities (FedEx Corp.), 5.1%, 2017 1,320,000 1,376,245

Pennsylvania Economic Development Financing (Amtrak), "A", 6%, 2006 100,000 101,136

Utah County, UT, Environmental Improvement Rev. (Marathon Oil), 5.05%, 2017 300,000 315,321

$ 3,805,599

Industrial Revenue - Paper – 1.5%

Courtland, AL, Industrial Development Board Environmental Improvement Rev.

(International Paper Co.), "A", 5%, 2013 $ 750,000 $ 760,522

Delta County, MI, Economic Development Corp., Environmental Improvements Rev.

(Mead Westvaco Escanaba), "B", 6.45%, 2012(c) 1,500,000 1,721,205

4

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Industrial Revenue - Paper – continued

Erie County, PA, Industrial Development Authority, Pollution Control (International

Paper Co.), "A", 5.25%, 2010 $ 250,000 $ 258,820

Erie County, PA, Industrial Development Authority, Pollution Control (International

Paper Co.), "A", 5.3%, 2012 570,000 588,998

$ 3,329,545

Miscellaneous Revenue - Entertainment & Tourism – 0.9%

Arizona Tourism & Sports Authority, Tax Rev. (Multipurpose Stadium Facility), "A",

MBIA, 5%, 2010 $ 1,000,000 $ 1,061,210

George L. Smith II, GA, World Congress Center Authority Rev. (Domed Stadium),

MBIA, 6%, 2011 1,000,000 1,098,290

$ 2,159,500

Miscellaneous Revenue - Other – 1.0%

Gallery Certificate Trust, PA, Parking Rev., FSA, 4.5%, 2013(r) $ 490,000 $ 488,824

Illinois Development Finance Authority Rev. (Elgin School District), FSA, 0%, 2010 500,000 432,045

Indiana Bond Bank Common School Fund, AMBAC, 5.75%, 2013 685,000 729,367

State of Kentucky Property & Buildings Commerce Rev. (Project Number 69), "A",

FSA, 5.5%, 2011 500,000 548,020

$ 2,198,256

Multi-Family Housing Revenue – 0.7%

Massachusetts Housing Finance Agency, Construction Loan Notes, "B", FSA, 3.15%,

2008 $ 1,000,000 $ 985,900

Missouri Housing Development Commission, Multi-family Housing, "II", 4.35%, 2007 150,000 150,884

Philadelphia, PA, Housing Authority, "A", FSA, 5%, 2008 500,000 522,060

$ 1,658,844

Parking – 0.3%

Pittsburgh, PA, Public Parking Authority Rev. "A", FGIC, 5%, 2016 $ 690,000 $ 740,936

Sales & Excise Tax Revenue – 1.3%

Monroe, LA, Sales & Use Tax Rev., FGIC, 5.75%, 2011 $ 845,000 $ 931,393

Spokane, WA, Public Facilities District Hotel, "A", MBIA, 5.75%, 2012 425,000 467,237

State of California, Economic Recovery, "B", 5%, 2023 745,000 772,870

Wyandotte County-Kansas City, KS, Sales Tax Second Lien Area B, 4.75%, 2016 695,000 706,898

$ 2,878,398

Single Family Housing - State – 1.8%

Colorado Housing & Finance Authority Rev., "C-2", 8.4%, 2021 $ 35,000 $ 36,406

Colorado Housing & Finance Authority Rev., Single Family Program, "A-3",

6.3%, 2012 80,000 81,862

Colorado Housing & Finance Authority Rev., Single Family Program, "B-3",

6.7%, 2016 40,000 40,332

Colorado Housing & Finance Authority, Single Family Program, "A-3", 7.25%, 2010 65,000 66,416

Massachusetts Housing Finance Agency, "A", MBIA, 5.35%, 2010 230,000 235,440

New Hampshire Housing Finance Authority, Single Family Rev., Mortgage Acquisition,

"F", 3.7%, 2010 500,000 490,015

Oklahoma Housing Finance Agency Single Family Rev., Mortgage Homeownership,

GNMA, 7.6%, 2015 85,000 88,295

South Dakota Housing Development Authority, Homeownership Mortgage, "A",

4.15%, 2007 55,000 55,102

South Dakota Housing Development Authority, Homeownership Mortgage, "D",

4.9%, 2008 460,000 467,788

Tennessee Housing Development Agency (Homeownership Program), 5.65%, 2009 1,885,000 1,961,229

Wyoming Community Development Authority, Housing Rev., "4", 5%, 2006 600,000 601,812

$ 4,124,697

5

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Solid Waste Revenue – 0.7%

Central Wayne County, MI, Sanitation Rev., "VII", 4.75%, 2007 $ 500,000 $ 501,605

Massachusetts Development Finance Agency, Resource Recovery Rev. (Semass

Systems), "B", MBIA, 5.625%, 2012 400,000 436,540

Niagara County, NY, Industrial Development Agency, Solid Waste Disposal Rev.,

(American Ref-fuel), "C", 5.625%, 2024 300,000 314,652

Tacoma, WA, Solid Waste Utility Rev., AMBAC, 5%, 2010 400,000 426,056

$ 1,678,853

State & Agency - Other – 0.6%

New York Dormitory Authority Rev. (City University), MBIA, 5.25%, 2011 $ 1,270,000 $ 1,374,102

State & Local Agencies – 9.5%

Alabama Public School & College, "C", FSA, 4.5%, 2009 $ 1,000,000 $ 1,032,850

Alaska COP (Alaska Psychiatric Institute), AMBAC, 4%, 2006 500,000 501,495

Arizona COP, "A", MBIA, 5%, 2006 500,000 502,135

Columbia, SC, COP, Tourism Development Fee Pledge, AMBAC, 5%, 2011 650,000 698,295

Columbus, IN, Multi-School Building Corp., First Mortgage, FSA, 5%, 2010 725,000 765,194

District of Columbia, COP, AMBAC, 5.25%, 2008 1,500,000 1,549,470

Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., "B"

Enhanced, 5.5%, 2007(c) 1,120,000 1,152,872

Hampton, VA, Museum Rev., 5%, 2014 760,000 803,685

Indiana Bond Bank Rev., "A", AMBAC, 5.3%, 2007 350,000 356,828

Indianapolis, IN (Public Improvement Bond Bank), "A", 5.25%, 2006 275,000 275,000

Michigan Building Authority Rev., "II", FSA, 5%, 2007(c) 1,500,000 1,556,700

Mishawaka, IN, School Building, AMBAC, 4.5%, 2007 320,000 323,498

New Albany, IN, Floyd County School Building (First Mortgage), FGIC, 5.5%, 2007 250,000 255,288

New Jersey Building Authority, 5.5%, 2006 1,000,000 1,007,850

New Jersey Economic Development Authority, "A", MBIA, 5%, 2009 500,000 525,055

New Jersey State Transit Corp. (Federal Transit Administration Grants), "B", AMBAC,

5.5%, 2007 650,000 671,372

New York Dormitory Authority Rev. (School Districts Financing Program), "A", MBIA,

5.25%, 2009 1,000,000 1,062,420

New York Tobacco Settlement Financing Corp., "A-1", 5.25%, 2012 1,000,000 1,006,330

New York Tobacco Settlement Financing Corp., "B-1", 5.25%, 2013 1,000,000 1,039,880

New York Urban Development Corp. Rev., "A", 5.125%, 2015 675,000 725,767

Ohio Building Authority (Adult Correctional Building), "A", 5.75%, 2008 425,000 445,710

Ohio Building Authority (Adult Correctional Building), FSA, 5%, 2009 1,290,000 1,353,287

Ohio Building Authority (State Facilities Administration Building), "A", 5.375%, 2009(c) 1,000,000 1,076,600

Pennsylvania Industrial Development Authority, Economic Development, AMBAC,

5.25%, 2011 1,900,000 2,056,712

Phoenix, AZ (Civic Improvement Corp.), AMBAC, 5.5%, 2007 250,000 257,620

State of Oregon, Department Administrative Services, "A", AMBAC, 5.5%, 2008 500,000 523,030

Suffolk County, NY, Judicial Facilities (John P. Cohalan Complex), AMBAC,

5.75%, 2011 160,000 173,731

Virginia, MN, Housing & Redevelopment Authority, Healthcare Facility Lease Rev.,

5.25%, 2012 85,000 88,529

Virginia, MN, Housing & Redevelopment Authority, Healthcare Facility Lease Rev.,

5.25%, 2013 215,000 223,643

$ 22,010,846

Student Loan Revenue – 0.5%

Connecticut State Higher Education Supplemental Loan Authority Rev. (Family

Education Loan Program), "A", MBIA, 4.125%, 2013 $ 1,000,000 $ 993,700

Massachusetts Educational Financing Authority, "E", AMBAC, 4.5%, 2009 85,000 85,991

$ 1,079,691

6

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Tax - Other – 2.9%

Chicago, IL, Motor Fuel Tax Rev., AMBAC, 6.125%, 2009 $ 500,000 $ 536,870

Denver, CO, City & County Excise Tax, "A", FSA, 5.25%, 2008 250,000 261,567

District of Columbia, Tax Increment (Gallery Place), FSA, 4%, 2006 370,000 371,154

Harris County-Houston, TX, (Sport Capital Appreciation), "N", MBIA, 0%, 2040 600,000 536,874

New Jersey Economic Development Authority Rev., Cigarette Tax, 5.375%, 2015 2,730,000 2,959,511

New Mexico (Severence Tax), "A", 5%, 2007(c) 1,500,000 1,536,510

Virgin Islands Public Finance Authority Rev., Matching Fund Loan Note, "A", 5%, 2013 200,000 211,586

Virgin Islands Public Finance Authority Rev., Matching Fund Loan Note, "A", 5%, 2014 250,000 267,003

$ 6,681,075

Tax Assessment – 1.0%

Chicago, IL, Tax Increment, Allocation Capital Appreciation Central, "A", AMBAC,

0%, 2006 $ 1,000,000 $ 972,950

Dyer, IN, Redevelopment Authority, Economic Development Lease Rent, CIFG,

5%, 2011 570,000 601,378

Lewisville, TX, Combination Contract Rev., Special Assessment (Castle Hills Number

3), 4.125%, 2006(c) 500,000 503,355

Omaha, NE, Special Obligations (Riverfront Redevelopment), "A", 4.125%, 2008 285,000 288,788

$ 2,366,471

Tobacco – 1.0%

District of Columbia Tobacco Settlement, Asset Backed Bonds, 5.2%, 2008 $ 450,000 $ 462,042

Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement, "A", 5%, 2021 730,000 736,322

New Jersey Tobacco Settlement Financing Corp., 4.375%, 2019 190,000 189,861

South Carolina Tobacco Settlement Authority, "B", 6%, 2022 225,000 236,702

Virginia Tobacco Settlement Financing Corp., 5.25%, 2019 685,000 695,227

$ 2,320,154

Toll Roads – 0.4%

State of Texas Turnpike Authority, Central Turnpike Systems Rev., 5%, 2007 $ 1,000,000 $ 1,021,860

Transportation - Special Tax – 2.0%

Arizona State Transportation Board Highway Rev., 5%, 2006 $ 550,000 $ 553,965

Colorado Department of Transportation Rev., AMBAC, 6%, 2008 235,000 248,990

Du Page County, IL, Transportation Rev., FSA, 5.5%, 2011 1,000,000 1,085,260

New Jersey Transportation Trust Fund Authority, Transportation Systems, "B", FGIC,

5.25%, 2014 1,000,000 1,097,190

New Mexico State Highway Commission, Tax Rev., "A", 5.5%, 2006 430,000 433,517

New York Thruway Authority, Highway & Bridge Trust Fund, "A", FGIC, 5.25%, 2010 1,000,000 1,069,970

$ 4,488,892

Universities - Colleges – 4.3%

Auburn University, AL, University Athletics Rev., AMBAC, 5%, 2006 $ 255,000 $ 255,760

District of Columbia Rev. (Gonzaga College High School), FSA, 5%, 2012 445,000 476,947

Illinois Educational Facilities Authority Rev. (Art Institute Chicago), 3.35%, 2009 1,550,000 1,517,620

Illinois Educational Facilities Authority Rev. (Augustana College), "A", 4%, 2006 615,000 612,977

Massachusetts Development Finance Agency (Massachusetts College of Pharmacy),

"C", 5%, 2007 475,000 481,175

Massachusetts Development Finance Agency (Western New England College),

4%, 2008 430,000 423,881

Massachusetts Development Finance Agency Rev. (Hampshire College), 5.15%, 2014 150,000 154,963

Massachusetts Health & Educational (Massachusetts Institute of Technology), "K",

5.25%, 2012 375,000 410,580

Rhode Island Health & Educational Building, Higher Education (Johnson & Wales),

XLCA, 5%, 2010 2,265,000 2,398,091

Southeast Missouri State University, System Facilities Rev., MBIA, 5.625%, 2010 250,000 271,200

Texas A&M University Rev., Financing Systems, 2.5%, 2006 750,000 747,660

7

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Universities - Colleges – continued

Texas Public Finance Authority Rev., Southern University Financing Systems, MBIA,

5%, 2007 $ 500,000 $ 513,755

University of Arizona Rev., Refunding Systems, FSA, 5%, 2006 570,000 573,278

University of Arkansas Rev., Athletic Facility (Razorback Stadium), FSA, 3.55%, 2021 500,000 501,280

University of Texas, Permanent University Fund, "A", 5%, 2009 580,000 608,681

$ 9,947,848

Universities - Dormitories – 0.5%

New York Dormitory Authority Rev., FGIC, 5.25%, 2029 $ 1,000,000 $ 1,079,150

Universities - Secondary Schools – 0.1%

New Hampshire Health & Education (Derryfield School), 6.5%, 2010 $ 100,000 $ 102,312

Utilities - Investor Owned – 3.9%

California Pollution Control Financing Authority, Pollution Control Rev. (Pacific Gas &

Electric) "A", FGIC, 3.5%, 2023 $ 1,000,000 $ 1,000,610

Chesapeake, VA, Industrial Development Authority Rev. (Virginia Electric & Power

Co.), 5.25%, 2008 250,000 253,625

Clark County, NV, Pollution Control Rev. (Southern California Edison Co.),

3.25%, 2031 500,000 486,115

Farmington, NM, Pollution Control Rev. (El Paso Electric Co.), "A", FGIC, 4%, 2032 695,000 688,724

Farmington, NM, Pollution Control Rev. (Southern California Edison Co.), "A", FGIC,

3.55%, 2029 535,000 532,523

Hillsborough County, FL, Industrial Development Authority, Pollution Control Rev.

(Tampa Electric Co.), 4%, 2025 500,000 500,000

Illinois Development Finance Authority, Gas Supply Rev. (Peoples Gas Light & Coke

Co.), "B", AMBAC, 3.05%, 2033 1,000,000 986,000

Illinois Development Finance Authority, Pollution Control Rev. (Commonwealth Edison

Co.), "B", AMBAC, 4.4%, 2006 500,000 504,355

Illinois Development Finance Authority, Pollution Control Rev. (Illinois Power),

AMBAC, 7.375%, 2006(c) 580,000 601,472

Lawrenceburg, IN, Pollution Control Rev. (Indiana, Michigan, Power Co.), "F",

2.625%, 2019 775,000 768,242

Madison, WI, Industrial Development Rev. (Madison Gas & Electric Co.), "B",

4.875%, 2027 420,000 440,572

New Hampshire Business Finance Authority, Pollution Control Rev. (United

Illuminating Co.), AMBAC, 3.65%, 2027 1,000,000 988,280

Peninsula Ports Authority, VA, Coal Terminal Rev. (Dominion Terminal Associates),

3.3%, 2033 775,000 761,949

Wilsonville, AL, Industrial Development Board, Pollution Control Rev. (Southern

Electric Gaston), "A", AMBAC, 4.2%, 2019 500,000 500,405

$ 9,012,872

Utilities - Municipal Owned – 7.7%

Alaska Municipal Bond Bank Authority Rev., "A", AMBAC, 5.75%, 2006 $ 325,000 $ 331,594

Clallam County, WA, Public Utilities District, Electric Rev., FSA, 5%, 2008 400,000 411,584

Clark County, WA, Public Utilities District 1, AMBAC, 5.25%, 2008 1,380,000 1,426,299

Cowlitz County, WA, Public Utilities Distribution Systems, AMBAC, 5.25%, 2008 500,000 522,630

Dalton, GA, Utilities Rev., FSA, 6%, 2012 500,000 563,365

Delaware Municipal Electric Corp., AMBAC, 5%, 2008 500,000 518,940

Dickson, Tennessee (Electric Systems Rev.), "Y", MBIA, 5.625%, 2008(c) 1,000,000 1,075,620

Energy Northwest, Washington, Wind Project Rev., MBIA, 5%, 2011 280,000 298,967

Energy Northwest, Washington, Wind Project Rev., MBIA, 5%, 2012 560,000 600,863

Energy Northwest, Washington, Wind Project Rev., MBIA, 5%, 2013 280,000 301,703

Kissimmee, FL, Utility Authority Electric System, AMBAC, 5%, 2011 500,000 535,805

Long Island Power Authority, NY, Electric Systems Rev., "A", 5%, 2009 1,100,000 1,143,978

Lower Colorado River Authority, TX, Rev., "F", FSA, 5.5%, 2008 600,000 627,426

8

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Utilities - Municipal Owned – continued

Lower Colorado River Authority, TX, Rev., Refunding & Improvement, "A", MBIA,

5%, 2011 $ 500,000 $ 534,370

Massachusetts Development Finance Agency (Devens Electrical Systems),

5.125%, 2011 160,000 163,258

Michigan Public Power Agency Rev. (Belle River), "A", MBIA, 5.25%, 2008 500,000 517,055

Muscatine, IA, Electric Rev., "A", AMBAC, 5.5%, 2010 1,000,000 1,072,480

North Carolina Eastern Municipal Power Agency, "A", 5.5%, 2010 750,000 795,345

North Carolina Municipal Power Agency Catawba, "A", 5.5%, 2013 500,000 541,425

North Carolina Municipal Power Agency Catawba, MBIA, 5.25%, 2007 500,000 508,260

Salt River, AZ, Agricultural Improvement (Salt River), "A", 5%, 2011 500,000 533,790

San Antonio, TX, Electric & Gas Rev., "2000", 5.8%, 2006 355,000 355,000

Snohomish County, WA, Public Utility 1, "B", FSA, 5.25%, 2008 1,000,000 1,049,430

South Carolina Public Service Authority, "A", FSA, 4.5%, 2008 500,000 510,730

Southern California Public Power Authority (San Juan), "A", FSA, 5.375%, 2012 595,000 653,090

State of California, Department Water Resources, Power Supply Rev., "A", 5.5%, 2010 600,000 644,466

State of California, Department Water Resources, Power Supply Rev., "A", FSA,

5.25%, 2011 1,000,000 1,081,640

Tacoma, WA, Electric Systems Rev., "A", FSA, 5.5%, 2011 500,000 542,165

$ 17,861,278

Utilities - Other – 0.7%

Brownsville, TX, Utility Systems Rev., AMBAC, 6.25%, 2011 $ 1,000,000 $ 1,134,970

Edmond, OK, Public Works Authority, Sales Tax & Utility System Rev., AMBAC,

4.5%, 2008 500,000 513,200

$ 1,648,170

Water & Sewer Utility Revenue – 6.9%

Allentown, PA, Water Rev. Guaranteed, AMBAC, 5%, 2011 $ 925,000 $ 993,126

Fulton County, GA, Development Authority Rev., Cauley Creek Water Facilities, "A",

AMBAC, 4.4%, 2008 490,000 498,800

Gwinnett County, GA, Water & Sewer Rev., 5.2%, 2007(c) 615,000 644,354

Harrison County, MS, Wastewater Treatment Facilities, "A", FGIC, 5.5%, 2011 400,000 435,220

Hempfield Township Pennsylvania Municipal Authority, Sewer Rev. (Westmoreland

County), FSA, 5%, 2013 845,000 914,670

Houston, TX, Utilities Systems Rev., MBIA, 5.25%, 2014 1,485,000 1,634,480

King County, WA, Sewer Rev., FGIC, 5.25%, 2012 750,000 812,850

Luzerne County, PA, Industrial Development Authority, Water Facility Rev.

(Pennsylvania-American Water Co.), AMBAC, 3.6%, 2033 1,000,000 987,300

Nueces River Authority, Texas Water Supply Rev. (Corpus Christi Project), FSA,

5%, 2013 540,000 582,055

Philadelphia, PA, Water & Wastewater, FSA, 5.625%, 2008 595,000 625,524

Phoenix, AZ, Civic Improvement Corp., FGIC, 4.5%, 2007 200,000 203,360

Phoenix, AZ, Civic Improvement Corp., Wastewater Systems Rev., FGIC,

5.25%, 2009 255,000 269,897

Rock Hill, SC, Utility Systems Rev., "A", FSA, 5%, 2010 750,000 794,423

Seattle, WA, Water Systems Rev., "B", 5%, 2008 475,000 491,991

Sebring, FL, Water & Wastewater, FGIC, 5.25%, 2013 690,000 753,791

Shreveport, LA, (Water & Sewer Rev.), "A", FGIC, 4%, 2007 1,000,000 1,010,690

Spartanburg, SC, Waterworks Rev., Junior Lien, FSA, 5%, 2007 500,000 511,130

State of Kansas, Development Finance Authority Rev., Water Pollution Control

Revolving Fund, 5%, 2008 500,000 518,000

Truckee Meadows, NV, Water Authority, "A", FSA, 5.5%, 2011 1,000,000 1,092,110

Utah Water Finance Agency Rev., "A", AMBAC, 5%, 2012 500,000 537,735

Wilkinsburg, PA, Joint Water, "B", FSA, 4.75%, 2010 1,260,000 1,323,794

9

MFS Municipal Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Municipal Bonds – continued

Water & Sewer Utility Revenue – continued

Wilsonville, OR, Water Systems Rev., MBIA, 5%, 2010 $ 300,000 $ 318,903

$ 15,954,203

Total Municipal Bonds $ 226,506,241

Floating Rate Demand Notes – 1.5%

Allegheny County, PA, Hospital Development Authority Rev. (Presbyterian University

Hospital), "B", 3.05%, due 2/02/06 $ 600,000 $ 600,000

Burke County, GA, Development Authority Pollution Control Rev. (Oglethorpe Power

Corp.), "A", 3.02%, due 2/01/06 100,000 100,000

Harris County, TX, Health Facilities Development Rev. (University of Texas Medical

Center), 3.07%, due 2/01/06 300,000 300,000

Jefferson County, AL, Sewer Rev., Capital Improvement Warrants, "A", 3.02%,

due 2/02/06 2,300,000 2,300,000

Missouri Health & Educational Facilities Authority Rev., Medical Research Facilities

(Stowers Institute), 3.02%, due 2/02/06 200,000 200,000

Total Floating Rate Demand Notes $ 3,500,000

Total Investments $ 230,006,241

Other Assets, Less Liabilities – 0.3% 721,340

Net Assets – 100.0% $ 230,727,581

(c)   Refunded bond.

(r)   Restricted securities (excluding 144A issues) are not registered under the Securities Act of 1933 and are subject to legal or

contractual restrictions on resale. These securities generally may be resold in transactions exempt from registration or to the

public if the securities are registered. Disposal of these securities may involve time-consuming negotiations and prompt sale

at an acceptable price may be difficult. The fund holds the following restricted security:

Security           Acquisition
                         Date Acquisition
Cost Current
Market Value        Total % of
        Net Assets

Gallery Certificate Trust, PA, Parking Rev., FSA, 4.5%, 2013 12/17/2003 $ 490,432 $ 488,824 0.2 %

The following abbreviations are used throughout this report and are defined:

BMA Bond Market Assn.

COP Certificate of Participation

ETM Escrowed to Maturity

Insurers

AMBAC AMBAC Indemnity Corp.

CIFG CDC IXIS Financial Guaranty

FGIC Financial Guaranty Insurance Co.

FSA Financial Security Assurance, Inc.

GNMA Government National Mortgage Assn.

MBIA MBIA Insurance Corp.

PSF Permanent School Fund

Q-SBLF Qualified School Board Loan Fund

XLCA XL Capital Insurance Co.

See attached schedules.

For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

10

MFS Municipal Limited Maturity Fund Supplemental Schedules (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a
federal income tax basis, are as follows:

Aggregate Cost	$	227,860,573
Gross unrealized appreciation	$	2,850,170
Gross unrealized depreciation		(704,502	)
Net unrealized appreciation (depreciation)	$	2,145,668

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments

Interest Rate Swaps
		Notional Principal Amount of Contract				Unrealized Appreciation (Depreciation)
			Cash Flows Paid by the Fund	Cash Flows Received by the Fund
Expiration	Currency		Cash Flows Paid by the Fund	Cash Flows Received by the Fund

8/30/2016	USD	$ 15,000,000	Fixed - 10 Year BMA	Floating - 7 Day BMA	$	(100,218	)
			Swap Index (3.926%)	Swap Index

At January 31, 2006, the fund had sufficient cash and/or securities to cover any commitments under all derivative contracts.

MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 97.2%

Advertising & Broadcasting – 1.7%

Chancellor Media Corp., 8%, 2008 $ 5,140,000 $ 5,454,876

EchoStar DBS Corp., 9.125%, 2009 4,134,000 4,325,198

News America Holdings, 7.75%, 2024 6,693,000 7,434,317

News America Holdings, 8.5%, 2025 4,931,000 5,844,300

$ 23,058,691

Airlines – 0.5%

Continental Airlines, Inc., 6.648%, 2017 $ 2,517,922 $ 2,496,652

Continental Airlines, Inc., 6.545%, 2019 4,395,139 4,408,542

$ 6,905,194

Asset Backed & Securitized – 11.0%

Airplane Pass-Through Trust, "D", 10.875%, 2019(r)(d) $ 1,481,550 $ 0

Amresco Commercial Mortgage Funding I, 7%, 2029 4,595,000 4,642,653

ARCap REIT, Inc., "G", 6.1%, 2045(a) 2,150,000 1,949,855

Asset Securitization Corp., FRN, 8.2927%, 2029 4,095,000 4,327,592

Blackrock Capital Finance LP, 7.75%, 2026(a) 825,790 809,274

Brazilian Merchant Voucher Receivables Ltd., 5.911%, 2011(a) 4,823,568 4,817,539

Capital One Auto Finance Trust, 2.47%, 2010 4,350,000 4,273,361

Chase Commercial Mortgage Securities Corp., 6.6%, 2012 4,039,542 4,162,607

Citibank Credit Card Issuance Trust, 6.65%, 2008 3,966,000 3,983,780

Commercial Mortgage Acceptance Corp., 7.03%, 2031 5,200,000 5,464,569

Commercial Mortgage Acceptance Corp., FRN, 1.141%, 2030(i) 68,751,329 2,129,841

Commercial Mortgage Acceptance Corp., FRN, 5.44%, 2030(a) 4,362,000 4,338,886

Countrywide Asset-Backed Certificates FRN, 4.575%, 2035 699,000 688,731

CPS Auto Receivables Trust, 3.52%, 2009(a) 820,689 815,560

CRIIMI MAE Commercial Mortgage Trust, 7%, 2011(a) 4,222,893 4,282,351

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031 4,706,505 4,807,311

DLJ Commercial Mortgage Corp., 6.04%, 2031 2,675,000 2,705,414

DLJ Commercial Mortgage Corp., FRN, 7.6214%, 2032 1,390,000 1,498,735

Drive Auto Receivables Trust, 2.5%, 2009(a) 4,240,000 4,150,017

Drivetime Auto Owner Trust, FRN, 1.918%, 2008(a) 2,954,230 2,925,148

Falcon Franchise Loan LLC, 6.5%, 2014(a) 2,733,000 2,356,358

Falcon Franchise Loan LLC, FRN, 3.7884%, 2025(i) 20,061,120 3,265,252

First Union-Lehman Brothers Commercial Mortgage Trust, 7%, 2029(a) 3,028,000 3,284,350

GMAC Commercial Mortgage Securities, Inc., 6.02%, 2033 4,140,000 4,153,152

GMAC Commercial Mortgage Securities, Inc., FRN, 7.6613%, 2034(a) 3,065,000 3,320,223

Greenwich Capital Commercial Funding Corp., 4.305%, 2042 3,544,438 3,446,401

Holmes Financing PLC, FRN, 5.32%, 2040 771,000 772,157

IKON Receivables Funding LLC, 3.27%, 2011 4,670,000 4,614,049

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.345%, 2042(a) 4,734,928 4,542,100

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3645%, 2043 7,331,619 7,347,524

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.038%, 2046 5,520,000 5,422,536

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 1.1597%, 2030(i) 43,447,967 1,125,867

Morgan Stanley Capital I, Inc., 6.86%, 2010 6,477,000 6,564,086

Morgan Stanley Capital I, Inc., 7.3%, 2030(a) 5,033,000 5,202,887

Morgan Stanley Capital I, Inc., 5.72%, 2032 6,145,781 6,248,908

Morgan Stanley Capital I, Inc., FRN, 0.731%, 2030(a)(i) 138,492,745 2,386,175

Mortgage Capital Funding, Inc., FRN, 0.7801%, 2031(i) 56,443,495 803,129

Nomura Asset Acceptance Corp., FRN, 4.423%, 2034 4,166,584 4,125,002

Prudential Securities Secured Financing Corp., FRN, 7.4486%, 2013(a) 3,468,000 3,724,567

Spirit Master Funding LLC, 5.05%, 2023(a) 3,034,358 2,945,779

TIAA Real Estate CDO Ltd., 7.17%, 2032(a) 2,317,318 2,368,479

Wachovia Bank Commercial Mortgage Trust, FRN, 4.847%, 2041 3,448,527 3,342,074

Wachovia Bank Commercial Mortgage Trust, FRN, 5.1949%, 2044 2,387,000 2,375,294

1

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Asset Backed & Securitized – continued

Wachovia Bank Commercial Mortgage Trust, FRN, 5.3164%, 2044 $ 3,900,000 $ 3,910,381

$ 150,419,954

Automotive – 3.8%

Ford Motor Co., 7.45%, 2031 $ 9,933,000 $ 7,325,588

Ford Motor Credit Co., 6.5%, 2007 10,345,000 10,233,719

Ford Motor Credit Co., 5.8%, 2009 5,595,000 5,076,388

General Motors Acceptance Corp., 5.85%, 2009 4,197,000 3,953,028

General Motors Acceptance Corp., 5.625%, 2009 9,058,000 8,486,775

General Motors Acceptance Corp., 7.25%, 2011 4,461,000 4,303,982

Johnson Controls, Inc., 5.5%, 2016 6,390,000 6,317,633

Lear Corp., 8.11%, 2009 2,869,000 2,639,480

TRW Automotive, Inc., 9.375%, 2013 3,004,000 3,266,850

$ 51,603,443

Banks & Credit Companies – 11.7%

Abbey National Capital Trust I, 8.963% to 2030, FRN to 2049 $ 4,214,000 $ 5,651,265

Banco Mercantil del Norte S.A., 5.875% to 2009, FRN to 2014(a) 4,158,000 4,126,815

Bank of America Corp., 7.4%, 2011 8,135,000 8,921,890

Barclays Bank PLC, 8.55% to 2011, FRN to 2049(a) 10,798,000 12,359,693

BBVA Bancomer Capital Trust I, 10.5%, 2011(a) 5,758,000 5,786,790

BNP Paribas, 5.186% to 2015, FRN to 2049(a) 7,063,000 6,786,703

Chuo Mitsui Trust & Banking Co., 5.506% to 2015, FRN to 2049(a) 6,696,000 6,506,557

Citigroup, Inc., 5%, 2014 5,712,000 5,581,012

Credit Suisse First Boston (USA), Inc., 4.875%, 2010 8,611,000 8,514,169

HBOS Capital Funding LP, 6.071% to 2014, FRN to 2049(a) 7,199,000 7,367,284

Kazkommerts International B.V., 8.5%, 2013 4,196,000 4,542,170

Mizuho Financial Group, Inc., 5.79%, 2014(a) 5,310,000 5,438,194

Natexis AMBS Co. LLC, 8.44% to 2008, FRN to 2049(a) 9,752,000 10,447,142

Nordea Bank AB, 5.424% to 2015, FRN to 2049(a) 4,178,000 4,102,370

Popular North America, Inc., 4.25%, 2008 3,595,000 3,521,288

RBS Capital Trust II, 6.425% to 2034, FRN to 2049 6,325,000 6,575,982

Resona Bank Ltd., 5.85% to 2016, FRN to 2049(a) 6,312,000 6,274,191

Royal Bank of Scotland Group PLC, 9.118%, 2049 2,152,000 2,450,997

Socgen Real Estate LLC, 7.64% to 2007, FRN to 2049(a) 12,502,000 12,961,524

Turanalem Finance B.V., 8%, 2014(a) 3,542,000 3,665,970

UFJ Finance Aruba AEC, 6.75%, 2013 6,193,000 6,700,021

UniCredito Italiano Capital Trust II, 9.2% to 2010, FRN to 2049(a) 5,204,000 5,990,886

Wachovia Corp., 4.875%, 2014 3,896,000 3,773,884

Wachovia Corp., 6.605%, 2025 7,936,000 8,639,518

Wells Fargo National Bank, 4.75%, 2015 3,642,000 3,509,530

$ 160,195,845

Broadcast & Cable TV – 2.8%

Cox Communications, Inc., 4.625%, 2013 $ 6,087,000 $ 5,637,012

CSC Holdings, Inc., 7.875%, 2007 5,875,000 5,963,125

Rogers Cable, Inc., 5.5%, 2014 2,229,000 2,095,260

TCI Communications Financing III, 9.65%, 2027 16,336,000 17,611,629

TCI Communications, Inc., 9.8%, 2012 3,539,000 4,227,403

Time Warner Entertainment Co. LP, 8.375%, 2033 2,271,000 2,685,358

$ 38,219,787

Brokerage & Asset Managers – 1.5%

AMVESCAP PLC, 4.5%, 2009 $ 4,186,000 $ 4,088,843

Lehman Brothers Holdings, Inc., 8.25%, 2007 8,405,000 8,755,522

2

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Brokerage & Asset Managers – continued

Morgan Stanley Dean Witter, Inc., 6.6%, 2012 $ 7,094,000 $ 7,558,785

$ 20,403,150

Building – 0.8%

American Standard Cos., Inc., 7.375%, 2008 $ 6,465,000 $ 6,712,015

CRH America, Inc., 6.95%, 2012 4,195,000 4,519,710

$ 11,231,725

Business Services – 0.2%

Xerox Corp., 7.625%, 2013 $ 1,970,000 $ 2,093,125

Chemicals – 0.5%

BCP Crystal Holdings Corp., 9.625%, 2014 $ 2,831,000 $ 3,142,410

Dow Chemical Co., 5.75%, 2008 3,106,000 3,173,065

$ 6,315,475

Conglomerates – 0.5%

Kennametal, Inc., 7.2%, 2012 $ 4,801,000 $ 5,190,899

Tyco International Group S.A., 6.75%, 2011 1,717,000 1,821,680

$ 7,012,579

Construction – 0.9%

Beazer Homes USA, Inc., 6.875%, 2015 $ 8,620,000 $ 8,404,500

Pulte Homes Inc., 5.2%, 2015 4,308,000 4,042,110

$ 12,446,610

Consumer Goods & Services – 0.3%

Fortune Brands, Inc., 5.125%, 2011 $ 3,626,000 $ 3,604,766

Containers – 0.4%

Owens-Brockway Glass Container, Inc., 8.25%, 2013 $ 4,625,000 $ 4,867,813

Defense Electronics – 1.8%

BAE Systems Holdings, Inc., 4.75%, 2010(a) $ 2,339,000 $ 2,288,620

BAE Systems Holdings, Inc., 6.4%, 2011(a) 6,654,000 6,999,662

Litton Industries, Inc., 8%, 2009 8,035,000 8,792,861

Raytheon Co., 8.3%, 2010 5,900,000 6,574,641

$ 24,655,784

Emerging Market Quasi-Sovereign – 0.6%

Export-Import Bank of Korea, 5.25%, 2014(a) $ 3,528,000 $ 3,509,958

Pemex Finance Ltd., 9.69%, 2009 2,626,500 2,830,684

Pemex Finance Ltd., 10.61%, 2017 1,500,000 1,996,500

$ 8,337,142

Emerging Market Sovereign – 0.5%

Federal Republic of Brazil, 8%, 2018 $ 2,488,000 $ 2,720,628

Republic of Panama, 9.375%, 2029 1,842,000 2,385,390

Republic of Panama, 6.7%, 2036 380,000 377,720

United Mexican States, 8.3%, 2031 688,000 866,880

$ 6,350,618

Energy - Independent – 1.6%

Chesapeake Energy Corp., 6.375%, 2015 $ 10,160,000 $ 10,134,600

Ocean Energy, Inc., 7.25%, 2011 8,687,000 9,534,651

Pioneer Natural Resource Co., 6.5%, 2008 2,560,000 2,605,069

$ 22,274,320

Energy - Integrated – 0.4%

Amerada Hess Corp., 7.3%, 2031 $ 4,926,000 $ 5,728,549

3

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Entertainment – 1.1%

Time Warner, Inc., 9.125%, 2013 $ 6,649,000 $ 7,836,472

Walt Disney Co., 6.75%, 2006 3,726,000 3,737,782

Walt Disney Co., 6.375%, 2012 3,973,000 4,193,847

$ 15,768,101

Financial Institutions – 1.6%

Capital One Bank, 4.25%, 2008 $ 3,474,000 $ 3,390,409

General Electric Capital Corp., 8.7%, 2007 1,244,000 1,290,490

HSBC Finance Corp., 5.25%, 2011 5,593,000 5,594,868

HSBC Finance Corp., 6.75%, 2011 2,384,000 2,544,188

HSBC Finance Corp., 5.5%, 2016 8,598,000 8,592,497

$ 21,412,452

Forest & Paper Products – 0.5%

MeadWestvaco Corp., 6.8%, 2032 $ 3,121,000 $ 3,087,221

Stone Container Corp., 7.375%, 2014 4,300,000 3,837,750

$ 6,924,971

Gaming & Lodging – 1.1%

Harrah's Operating Co., Inc., 7.125%, 2007 $ 6,189,000 $ 6,331,186

Harrah's Operating Co., Inc., 5.625%, 2015 4,331,000 4,233,964

Royal Caribbean Cruises Ltd., 8%, 2010 4,190,000 4,557,111

$ 15,122,261

Insurance – 1.8%

American International Group, Inc., 4.25%, 2013 $ 5,830,000 $ 5,480,970

ING Groep N.V., 5.775% to 2015, FRN to 2049 5,646,000 5,673,558

Prudential Insurance Co., 7.65%, 2007(a) 4,623,000 4,789,724

UnumProvident Corp., 7.625%, 2011 7,758,000 8,364,070

UnumProvident Corp., 6.85%, 2015(a) 773,000 806,525

$ 25,114,847

Insurance - Property & Casualty – 1.4%

ACE INA Holdings, Inc., 5.875%, 2014 $ 5,313,000 $ 5,453,412

AXIS Capital Holdings Ltd., 5.75%, 2014 5,600,000 5,569,284

Fund American Cos., Inc., 5.875%, 2013 6,104,000 6,107,717

St. Paul Travelers Cos., Inc., 5.5%, 2015 1,829,000 1,831,829

$ 18,962,242

Machinery & Tools – 0.3%

Ingersoll Rand Co., 6.25%, 2006 $ 4,675,000 $ 4,693,485

Medical & Health Technology & Services – 1.5%

AmerisourceBergen Corp., 5.875%, 2015(a) $ 6,845,000 $ 6,930,563

Cardinal Health, Inc., 5.85%, 2017 6,898,000 6,985,798

HCA, Inc., 8.75%, 2010 4,117,000 4,539,170

HCA, Inc., 7.875%, 2011 2,545,000 2,724,130

$ 21,179,661

Metals & Mining – 0.5%

Corporacion Nacional del Cobre de Chile, 6.375%, 2012(a) $ 2,308,000 $ 2,453,896

Peabody Energy Corp., 5.875%, 2016 5,160,000 5,056,800

$ 7,510,696

Mortgage Backed – 10.2%

Fannie Mae, 6%, 2012 – 2035 $ 21,048,004 $ 21,347,919

Fannie Mae, 5.5%, 2017 – 2035 49,666,998 49,628,458

Fannie Mae, 4.5%, 2018 12,877,749 12,536,174

Fannie Mae, 7.5%, 2030 - 2031 3,512,641 3,679,131

4

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Mortgage Backed – continued

Fannie Mae, 6.5%, 2032 $ 8,389,860 $ 8,617,508

Freddie Mac, 6%, 2034 2,845,206 2,876,753

Freddie Mac, 5.5%, 2035 13,854,366 13,719,221

Freddie Mac, 5%, 2035 27,182,369 26,254,355

Ginnie Mae, 6.5%, 2028 428,664 449,197

$ 139,108,716

Municipals – 1.0%

Corpus Christi, TX, Refunding General Improvement, FSA, 5%, 2015 $ 3,885,000 $ 4,202,793

Metropolitan Transportation Authority, NY, Rev. Refunding Transportation, "E", MBIA,

5.5%, 2015 4,405,000 4,981,042

Pima County, AZ, FSA, 5%, 2015 3,565,000 3,871,305

$ 13,055,140

Natural Gas - Pipeline – 2.5%

CenterPoint Energy Resources Corp., 7.875%, 2013 $ 8,438,000 $ 9,583,939

Enterprise Products Operating LP, 5.6%, 2014 8,000,000 7,955,784

Kinder Morgan Energy Partners LP, 7.4%, 2031 6,187,000 7,039,160

Kinder Morgan, Inc., 6.8%, 2008 3,345,000 3,447,079

Magellan Midstream Partners LP, 5.65%, 2016 2,059,000 2,053,902

Williams Cos., Inc., 7.125%, 2011 4,311,000 4,494,218

$ 34,574,082

Network & Telecom – 4.4%

AT&T, Inc., 5.1%, 2014 $ 8,569,000 $ 8,307,748

Citizens Communications Co., 9.25%, 2011 4,050,000 4,455,000

Citizens Communications Co., 9%, 2031 2,937,000 3,025,110

Deutsche Telekom International Finance B.V., 8%, 2010 11,689,000 12,954,673

Telecom Italia Capital, 6%, 2034 5,886,000 5,573,583

Telecomunicaciones de Puerto Rico, Inc., 6.65%, 2006 3,188,000 3,200,095

Telecomunicaciones de Puerto Rico, Inc., 6.8%, 2009 2,346,000 2,428,110

Telefonica Europe B.V., 7.75%, 2010 2,408,000 2,630,957

TELUS Corp., 8%, 2011 4,820,000 5,384,957

Verizon New York, Inc., 6.875%, 2012 3,786,000 3,968,201

Verizon New York, Inc., 7.375%, 2032 8,539,000 8,934,415

$ 60,862,849

Oil Services – 0.3%

Halliburton Co., 5.5%, 2010 $ 3,395,000 $ 3,452,257

Oils – 0.8%

Premcor Refining Group, Inc., 7.5%, 2015 $ 10,500,000 $ 11,183,309

Pharmaceuticals – 0.7%

Teva Pharmaceutical Finance LLC, 5.55%, 2016 $ 4,580,000 $ 4,569,910

Wyeth, 5.25%, 2013 5,206,000 5,239,136

$ 9,809,046

Precious Metals & Minerals – 0.2%

Freeport-McMoRan Copper & Gold, Inc., 6.875%, 2014 $ 2,145,000 $ 2,174,494

Printing & Publishing – 0.3%

Dex Media West LLC, 9.875%, 2013 $ 3,975,000 $ 4,387,406

Railroad & Shipping – 0.9%

CSX Corp., 6.3%, 2012 $ 4,932,000 $ 5,185,505

TFM S.A. de C.V., 9.375%, 2012 6,032,000 6,635,200

$ 11,820,705

5

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Real Estate – 2.7%

EOP Operating LP, 8.375%, 2006 $ 4,920,000 $ 4,939,744

EOP Operating LP, 6.8%, 2009 4,476,000 4,659,999

EOP Operating LP, 4.75%, 2014 6,881,000 6,477,560

HRPT Properties Trust, 6.25%, 2016 3,349,000 3,445,806

Simon Property Group LP, 6.35%, 2012 4,283,000 4,486,310

Simon Property Group LP, 5.75%, 2015(a) 6,800,000 6,857,548

Vornado Realty Trust, 5.625%, 2007 6,252,000 6,271,931

$ 37,138,898

Restaurants – 0.2%

YUM! Brands, Inc., 8.875%, 2011 $ 2,887,000 $ 3,297,150

Retailers – 1.1%

Couche-Tard, Inc., 7.5%, 2013 $ 4,200,000 $ 4,357,500

Dollar General Corp., 8.625%, 2010 4,765,000 5,193,850

Limited Brands, Inc., 5.25%, 2014 5,894,000 5,527,358

$ 15,078,708

Supermarkets – 0.9%

Kroger Co., 7.8%, 2007 $ 5,052,000 $ 5,232,018

Safeway, Inc., 4.95%, 2010 3,689,000 3,593,134

Safeway, Inc., 6.5%, 2011 3,448,000 3,572,425

$ 12,397,577

Supranational – 0.2%

Corporacion Andina de Fomento, 6.875%, 2012 $ 2,747,000 $ 2,963,027

Telecommunications - Wireless – 1.2%

America Movil S.A. de C.V., 6.375%, 2035 $ 3,431,000 $ 3,301,538

Mobile TeleSystems OJSC, 9.75%, 2008(a) 3,758,000 3,988,178

Nextel Communications, Inc., 5.95%, 2014 5,345,000 5,382,928

Rogers Wireless, Inc., 7.25%, 2012 3,315,000 3,505,613

$ 16,178,257

Tobacco – 1.0%

Altria Group, Inc., 7%, 2013 $ 5,021,000 $ 5,456,702

R.J. Reynolds Tobacco Holdings, Inc., 7.25%, 2012 7,722,000 7,915,050

$ 13,371,752

Transportation - Services – 0.5%

FedEx Corp., 9.65%, 2012 $ 5,930,000 $ 7,289,488

U.S. Government Agencies – 3.9%

Small Business Administration, 4.93%, 2024 $ 7,327,482 $ 7,257,065

Small Business Administration, 4.34%, 2024 6,192,052 5,919,808

Small Business Administration, 4.99%, 2024 6,696,458 6,649,305

Small Business Administration, 4.86%, 2025 4,028,783 3,963,740

Small Business Administration, 4.625%, 2025 6,935,079 6,726,269

Small Business Administration, 5.11%, 2025 14,717,632 14,690,096

Small Business Administration, 4.57%, 2025 8,450,800 8,148,587

$ 53,354,870

U.S. Treasury Obligations – 6.4%

U.S. Treasury Bonds, 6.25%, 2023 $ 20,663,000 $ 24,324,236

U.S. Treasury Bonds, 5.375%, 2031 9,367,000 10,311,746

U.S. Treasury Notes, 4.375%, 2007 13,476,000 13,443,887

U.S. Treasury Notes, 4.25%, 2015 12,987,000 12,691,754

U.S. Treasury Notes, 9.875%, 2015 2,336,000 3,307,356

U.S. Treasury Notes, TIPS, 3%, 2012 14,766,763 15,723,723

6

MFS Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

U.S. Treasury Obligations – continued

U.S. Treasury Notes, TIPS, 2%, 2014 $ 7,298,047 $ 7,310,877

$ 87,113,579

Utilities - Electric Power – 6.5%

Beaver Valley Funding Corp., 9%, 2017 $ 9,886,000 $ 11,424,459

Dominion Resources, Inc., 5.95%, 2035 5,155,000 4,957,069

DPL, Inc., 6.875%, 2011 3,644,000 3,880,860

DTE Energy Co., 7.05%, 2011 3,922,000 4,207,647

Duke Capital Corp., 8%, 2019 5,750,000 6,823,295

Enersis S.A., 7.375%, 2014 4,189,000 4,467,313

Exelon Generation Co. LLC, 6.95%, 2011 7,785,000 8,353,523

FirstEnergy Corp., 6.45%, 2011 7,334,000 7,709,934

Midland Funding II, 13.25%, 2006 682,943 703,455

NiSource Finance Corp., 7.875%, 2010 3,010,000 3,324,202

Northeast Utilities, 8.58%, 2006 905,400 915,803

NorthWestern Corp., 5.875%, 2014 200,000 198,578

NRG Energy, Inc., 7.375%, 2016 6,825,000 6,944,438

Progress Energy, Inc., 5.625%, 2016 2,828,000 2,801,606

PSEG Power LLC, 7.75%, 2011 2,502,000 2,764,715

PSEG Power LLC, 8.625%, 2031 1,718,000 2,235,841

System Energy Resources, Inc., 5.129%, 2014(a) 3,533,658 3,394,360

TXU Corp., 5.55%, 2014 2,585,000 2,427,422

TXU Energy Co., 7%, 2013 5,305,000 5,614,757

Waterford 3 Funding Corp., 8.09%, 2017 6,180,824 6,519,098

$ 89,668,375

Total Bonds $ 1,330,692,971

Short-Term Obligation – 2.0%

Sheffield Receivables Corp., 4.48%, due 2/01/06(t)(y) $ 27,091,000 $ 27,091,000

Total Investments $ 1,357,783,971

Other Assets, Less Liabilities – 0.8% 10,996,351

Net Assets – 100.0% $ 1,368,780,322

(t) Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities Act of

1933.

(a) SEC Rule 144A restriction.

(y) The rate shown represents an annualized yield at time of purchase.

(i) Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the notional

principal and does not reflect the cost of the security.

(d) Non-income producing security - in default.

(r) Restricted securities (excluding 144A issues) are not registered under the Securities Act of 1933 and are subject to legal or

contractual restrictions on resale. These securities generally may be resold in transactions exempt from registration or to the

public if the securities are registered. Disposal of these securities may involve time-consuming negotiations and prompt sale at an

acceptable price may be difficult. The fund holds the following restricted security:

         Acquisition
        Date          Acquisition
        Cost Current
Market Value            Total % of
             Net Assets

Restricted Security

Airplane Pass-Through Trust, “D”, 10.875%, 2019 3/13/96 $1,481,550 $0 0.0 %

Total Restricted Securities $0 0.0 %

The following abbreviations are used in the Portfolio of Investments and are defined:

FRN Floating Rate Note. The interest rate is the rate in effect as of period end.

FSA Financial Security Assistance, Inc.

MBIA MBIA Insurance Corp.

TIPS Treasury Inflation Protected Security

See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual

report.

7

MFS Bond Fund

Supplemental Schedules (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a federal income tax basis, are as follows:

Aggregate Cost	$	1,364,505,768
Gross unrealized appreciation	$	18,988,568
Gross unrealized depreciation		(25,710,365	)
Net unrealized appreciation (depreciation)	$	(6,721,797	)

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments

Credit Default Swaps



Expiration	Notional Principal Amount of Contract	Description	Unrealized Appreciation (Depreciation)

3/20/11	$ 6,894,000	Agreement between the fund and Merrill	$2,084
		Lynch Capital Services to exchange the
		credit risk of Kohls Corp. As a buyer of
		protection, the fund agrees to pay Merrill
		Lynch quarterly at a fixed annual rate of
		0.42% of the notional amount of $6,894,000
		until maturity on March 20, 2011. If Kohls
		Corp. experiences one of the following credit
		events: bankruptcy, failure to pay, or a
		restructuring, the fund would then purchase
		$6,894,000 par of Kohls bonds at the post
		credit event market price, and then deliver
		those bonds to Merrill Lynch, who in turn
		would deliver $6,894,000 in cash to the fund.
At January 31, 2006, the fund had sufficient cash and/or securities to cover any commitments under these
derivative contracts.
MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.
				8

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 97.6%

Advertising & Broadcasting – 0.9%

Clear Channel Communications, Inc., 4.625%, 2008 $ 4,060,000 $ 3,999,664

Liberty Media Corp., FRN, 5.9913%, 2006 1,977,000 1,987,241

$ 5,986,905

Airlines – 0.2%

American Airlines Corp., 3.857%, 2012 $ 1,141,010 $ 1,095,571

Alcoholic Beverages – 0.7%

Miller Brewing Co., 4.25%, 2008(a) $ 5,325,000 $ 5,213,186

Asset Backed & Securitized – 23.3%

Accredited Mortgage Loan Trust, FRN, 4.74%, 2035 $ 4,995,000 $ 4,996,743

Ameriquest Mortgage Securities, Inc., FRN, 4.83%, 2034 760,530 760,845

Bayview Commercial Asset Trust, FRN, 4.84%, 2035(a) 3,235,834 3,237,481

Bayview Financial Acquisition Trust, FRN, 5.483%, 2045 2,325,000 2,324,971

Brascan Real Estate, FRN, 6.201%, 2040(a) 1,526,000 1,507,383

Brazilian Merchant Voucher Receivables Ltd., 5.911%, 2011(a) 1,908,941 1,906,555

Capital One Auto Finance Trust, 4.79%, 2009 1,894,042 1,889,735

Capital One Auto Finance Trust, 2.47%, 2010 6,610,000 6,493,544

Centex Home Equity Loan Trust, FRN, 3.9%, 2024 1,215,000 1,201,043

Chalet Finance 1 PLC, FRN, 4.81%, 2013 4,800,000 4,804,939

Chase Commercial Mortgage Securities Corp., 7.37%, 2029 978,601 989,648

Circuit City Credit Card Master Trust, FRN, 4.9%, 2011 2,530,000 2,531,581

Citibank Credit Card Issuance Trust, 6.65%, 2008 3,375,000 3,390,130

Commercial Mortgage Asset Trust, FRN, 0.8874%, 2032(a)(i) 30,197,975 1,352,259

Commercial Mortgage Pass-Through Certificate, FRN, 4.66%, 2017(a) 3,400,000 3,399,497

Continental Airlines, Inc., FRN, 4.79%, 2013 1,609,875 1,614,084

Countrywide Asset-Backed Certificates, FRN, 4.575%, 2035 2,266,000 2,232,710

CPS Auto Receivables Trust, 3.5%, 2009(a) 208,544 206,882

CPS Auto Receivables Trust, 3.52%, 2009(a) 147,703 146,780

CPS Auto Receivables Trust, 2.89%, 2009(a) 596,313 582,151

Credit-Based Asset Servicing and Securities, FRN, 5.303%, 2035 4,216,085 4,204,887

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031 3,491,109 3,565,883

Drive Auto Receivables Trust, 2.77%, 2008(a) 2,880,345 2,876,409

Drivetime Auto Owner Trust, FRN, 1.918%, 2008(a) 2,085,852 2,065,319

E*TRADE RV & Marine Trust, 3.62%, 2018 3,411,000 3,270,120

Falcon Franchise Loan LLC, 7.382%, 2010(a) 1,028,131 1,065,400

First Auto Receivables Group Trust, 2.436%, 2007(a) 846,699 844,046

Gramercy Real Estate CDO Ltd., FRN, 4.9423%, 2035 2,177,207 2,179,166

Holmes Financing PLC, FRN, 5.32%, 2040 2,600,000 2,603,900

Household Automotive Trust, 3.44%, 2009 3,293,062 3,264,015

IKON Receivables Funding LLC, 2.33%, 2007 153,857 153,492

IKON Receivables Funding LLC, 3.27%, 2011 500,000 494,010

IMPAC CMB Trust, FRN, 5.17%, 2033 964,705 965,064

IMPAC CMB Trust, FRN, 4.9%, 2034 2,133,926 2,137,029

IMPAC CMB Trust, FRN, 4.99%, 2034 2,246,238 2,251,383

Interstar Millennium Trust, FRN, 4.6888%, 2036 2,670,250 2,675,626

J.P. Morgan Chase Commercial Mortgage Securities Corp., 4.851%, 2042 3,504,086 3,457,315

J.P. Morgan Commercial Mortgage Finance Corp., 7.325%, 2031 72,397 72,471

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 6.48%, 2030 3,172,191 3,233,841

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4943%, 2035(i) 68,125,039 1,236,946

Long Beach Auto Receivables Trust, FRN, 2.841%, 2010 3,367,000 3,288,345

Medallion Trust, FRN, 4.7985%, 2031 307,060 306,704

Merrill Lynch Mortgage Investors, Inc., FRN, 7.0762%, 2030 2,180,000 2,244,807

Morgan Stanley ABS Capital I, FRN, 4.74%, 2035 2,950,133 2,952,426

1

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Asset Backed & Securitized – continued

Morgan Stanley Capital I, Inc., 6.48%, 2030 $ 2,000,000 $ 2,043,319

Morgan Stanley Capital I, Inc., FRN, 1.037%, 2031(a)(i) 35,322,148 874,930

Mortgage Capital Funding, Inc., FRN, 0.7852%, 2031(i) 27,177,256 386,702

Nationslink Funding Corp., 6.476%, 2030 2,077,163 2,133,219

Nationslink Funding Corp., FRN, 0.7183%, 2030(i) 30,584,564 520,595

New Century Home Equity Loan Trust, FRN, 4.532%, 2035 2,600,000 2,550,161

Nomura Asset Acceptance Corp., FRN, 3.958%, 2034 1,809,221 1,798,702

Nomura Asset Acceptance Corp., FRN, 4.423%, 2034 1,492,757 1,477,860

NovaStar Mortgage Funding Trust, FRN, 4.82%, 2034 1,903,706 1,904,829

Ownit Mortgage Loan Asset-Backed Certificates, FRN, 5.29%, 2036 5,096,147 5,096,147

People's Choice Home Loan Securities Trust, FRN, 4.8%, 2035 7,100,000 7,109,164

Popular ABS Mortgage Pass-Through Trust, FRN, 4.62%, 2035 2,975,957 2,935,773

Providian Gateway Master Trust, FRN, 4.77%, 2010(a) 4,250,000 4,262,618

Putnam Structured Product Funding, FRN, 4.92%, 2008(a) 2,572,881 2,572,881

Residential Asset Mortgage Products, Inc., FRN, 4.74%, 2035 7,773,377 7,778,970

RMAC PLC, FRN, 4.83%, 2035(a) 2,655,238 2,654,919

RMAC PLC, FRN, 4.68%, 2036(a) 1,260,000 1,259,409

Structured Asset Securities Corp., FRN, 4.78%, 2034 789,974 790,328

Structured Asset Securities Corp., FRN, 4.67%, 2035 2,054,991 2,032,236

Structured Asset Securities Corp., FRN, 4.77%, 2035(a) 4,543,641 4,544,144

Superannuation Members Home Loans Global Trust, FRN, 4.77%, 2029 1,469,141 1,468,925

Thornburg Mortgage Securities Trust, FRN, 4.87%, 2043 2,118,271 2,130,584

TIAA Real Estate CDO Ltd., 7.17%, 2032(a) 2,290,522 2,341,091

Triad Auto Receivables Trust, 2.48%, 2008 241,571 240,543

Triad Auto Receivables Trust, 3.24%, 2009 2,785,709 2,759,168

Triad Auto Receivables Trust, FRN, 4.8%, 2009 2,404,700 2,405,586

Washington Mutual, Inc., FRN, 3.177%, 2033 1,759,881 1,737,540

$ 164,787,908

Automotive – 2.4%

DaimlerChrysler North America Holdings, FRN, 4.78%, 2008 $ 1,700,000 $ 1,705,625

DaimlerChrysler Services North America LLC, 4.75%, 2008 2,050,000 2,028,026

Ford Motor Credit Co., 5.8%, 2009 3,785,000 3,434,161

General Motors Acceptance Corp., 6.125%, 2006 1,810,000 1,790,803

General Motors Acceptance Corp., 5.625%, 2009 3,360,000 3,148,108

Johnson Controls, Inc., 5.25%, 2011 5,050,000 5,034,668

$ 17,141,391

Banks & Credit Companies – 10.8%

BANK ONE Corp., 7.875%, 2010 $ 5,066,000 $ 5,611,466

BBVA Bancomer Capital Trust I, 10.5%, 2011(a) 1,863,000 1,872,315

Bosphorus Financial Services Ltd., FRN, 6.14%, 2012(a) 1,700,000 1,708,745

Commercial Credit Co., 6.25%, 2008 2,500,000 2,562,178

Credit Suisse First Boston (USA), Inc., 4.7%, 2009 7,200,000 7,121,081

Credit Suisse First Boston (USA), Inc., 4.875%, 2010 3,100,000 3,065,141

DEPFA Bank PLC, 3.625%, 2008 6,100,000 5,914,682

Natexis AMBS Co. LLC, 8.44% to 2008, FRN to 2049(a) 5,324,000 5,703,505

National Westminster Bank PLC, 7.75% to 2007, FRN to 2049 1,110,000 1,155,072

NationsBank Corp., 7.5%, 2006 3,920,000 3,981,724

Popular North America, Inc., 6.125%, 2006 2,620,000 2,636,443

Popular North America, Inc., 3.875%, 2008 3,000,000 2,892,618

Popular North America, Inc., 4.7%, 2009 3,300,000 3,236,082

Royal Bank of Scotland Group PLC, 9.118%, 2049 3,157,000 3,595,630

Socgen Real Estate LLC, 7.64% to 2007, FRN to 2049(a) 7,367,000 7,637,781

Spintab AB, 7.5% to 2006, FRN to 2049 1,125,000 1,140,904

2

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Banks & Credit Companies – continued

Spintab AB, 7.5% to 2006, FRN to 2049(a) $ 1,150,000 $ 1,166,258

Turanalem Finance B.V., 10%, 2007 2,725,000 2,881,688

VTB Capital, FRN, 5.25%, 2007(a) 2,001,000 2,001,000

Wachovia Capital Trust III, FRN, 5.8%, 2049 2,820,000 2,828,714

Wachovia Corp., 6.4%, 2008 4,300,000 4,430,398

Wachovia Corp., 6.3%, 2028 2,770,000 2,853,371

$ 75,996,796

Broadcast & Cable TV – 1.4%

Comcast Corp., 5.45%, 2010 $ 3,100,000 $ 3,108,252

Cox Communications, Inc., 4.625%, 2010 3,820,000 3,689,073

Time Warner Entertainment Co. LP, 7.25%, 2008 3,100,000 3,239,361

$ 10,036,686

Brokerage & Asset Managers – 2.8%

AMVESCAP PLC, 4.5%, 2009 $ 3,208,000 $ 3,133,542

Goldman Sachs Group, Inc., 7.35%, 2009 3,900,000 4,184,372

Goldman Sachs Group, Inc., 5%, 2011 870,000 864,034

Lehman Brothers Holdings E-Capital, FRN, 5.15%, 2065(a) 2,524,000 2,530,792

Lehman Brothers Holdings, Inc., 3.95%, 2009 5,000,000 4,790,410

Merrill Lynch & Co., Inc., 4.25%, 2010 4,600,000 4,456,020

$ 19,959,170

Building – 0.5%

Hanson PLC, 7.875%, 2010 $ 3,480,000 $ 3,825,310

Chemicals – 0.7%

Chevron Phillips Chemical Co. LLC, 5.375%, 2007 $ 5,005,000 $ 5,007,953

Conglomerates – 0.5%

Tyco International Group S.A., 5.8%, 2006 $ 3,321,000 $ 3,332,198

Consumer Goods & Services – 0.9%

Cendant Corp., 6.875%, 2006 $ 2,700,000 $ 2,723,147

Fortune Brands, Inc., 5.125%, 2011 3,272,000 3,252,839

$ 5,975,986

Defense Electronics – 0.5%

BAE Systems Holdings, Inc., 4.75%, 2010(a) $ 3,932,000 $ 3,847,309

Emerging Market Quasi-Sovereign – 0.6%

Export-Import Banks of Korea, 4.125%, 2009(a) $ 2,300,000 $ 2,239,579

Gazprom, 9.125%, 2007 1,800,000 1,876,500

$ 4,116,079

Energy - Independent – 0.5%

Ocean Energy, Inc., 4.375%, 2007 $ 1,155,000 $ 1,140,348

Pioneer Natural Resource Co., 6.5%, 2008 2,000,000 2,035,210

$ 3,175,558

Entertainment – 0.4%

Walt Disney Co., 6.75%, 2006 $ 2,950,000 $ 2,959,328

Financial Institutions – 2.8%

Capital One Bank, 4.25%, 2008 $ 3,091,000 $ 3,016,624

Countrywide Home Loans, Inc., 5.5%, 2007 660,000 662,212

Countrywide Home Loans, Inc., 4.125%, 2009 4,400,000 4,234,102

Household Finance Corp., 4.75%, 2009 9,500,000 9,397,904

International Lease Finance Corp., 5%, 2010 2,341,000 2,321,703

$ 19,632,545

3

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Food & Non-Alcoholic Beverages – 1.2%

Cadbury Schweppes PLC, 3.875%, 2008(a) $ 5,180,000 $ 5,018,255

Kraft Foods, Inc., 4%, 2008 3,600,000 3,498,642

$ 8,516,897

Gaming & Lodging – 0.4%

Carnival Corp., 3.75%, 2007 $ 2,600,000 $ 2,541,544

Industrial – 0.4%

Steelcase, Inc., 6.375%, 2006 $ 3,090,000 $ 3,089,054

Insurance – 1.7%

ASIF Global Financing XVIII, 3.85%, 2007(a) $ 2,500,000 $ 2,449,515

Hartford Financial Services Group, Inc., 4.7%, 2007 1,750,000 1,736,924

John Hancock Global Funding II, 3.5%, 2009(a) 4,530,000 4,339,745

Prudential Insurance Co., 7.65%, 2007(a) 3,380,000 3,501,896

$ 12,028,080

Insurance - Property & Casualty – 1.4%

AIG SunAmerica Global Financing IV, 5.85%, 2006(a) $ 2,615,000 $ 2,615,000

AIG SunAmerica Global Financing IX, 5.1%, 2007(a) 2,305,000 2,306,641

Safeco Corp., 4.2%, 2008 5,040,000 4,953,090

$ 9,874,731

International Market Quasi-Sovereign – 3.4%

KfW Bankengruppe, 2.375%, 2006 $ 4,580,000 $ 4,505,511

KfW Bankengruppe, 3.25%, 2007 6,400,000 6,259,206

KFW International Finance, Inc., 4.75%, 2007 2,000,000 1,993,878

Landesbank Baden-Wurttemberg, 5.125%, 2007 1,000,000 1,002,380

Landwirtschaftliche Rentenbank, 4.5%, 2006 1,000,000 997,598

Province of Manitoba, 4.25%, 2006 5,020,000 4,996,105

Province of Ontario, 6%, 2006 4,350,000 4,352,645

$ 24,107,323

International Market Sovereign – 1.1%

Bayerische Landesbank Girozentrale, 3.2%, 2009 $ 8,000,000 $ 7,584,280

Machinery & Tools – 0.6%

Ingersoll Rand Co., 6.25%, 2006 $ 4,225,000 $ 4,241,706

Medical & Health Technology & Services – 0.1%

Baxter International, Inc., 9.5%, 2008 $ 900,000 $ 980,586

Mortgage Backed – 11.2%

Fannie Mae, 7%, 2015 $ 347,828 $ 359,266

Fannie Mae, 5.5%, 2016 - 2019 7,815,248 7,869,752

Fannie Mae, 6.5%, 2017 1,189,179 1,221,999

Fannie Mae, 6%, 2017 3,650,160 3,731,290

Fannie Mae, 5%, 2018 7,168,211 7,093,883

Fannie Mae, 4.5%, 2018 3,860,843 3,758,436

Freddie Mac, 6%, 2017 1,152,199 1,174,373

Freddie Mac, 5.5%, 2017 - 2025 16,374,565 16,440,621

Freddie Mac, 5%, 2018 - 2023 31,543,210 31,298,279

Freddie Mac, 3%, 2021 5,100,000 4,980,178

Freddie Mac, 3.108%, 2035 667,042 663,771

Ginnie Mae, 7.5%, 2007 - 2011 489,087 513,177

$ 79,105,025

Natural Gas - Pipeline – 1.6%

Enterprise Products Partners LP, 4.95%, 2010 $ 3,800,000 $ 3,724,475

Kinder Morgan Energy Partners LP, 5.35%, 2007 4,380,000 4,382,041

4

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Natural Gas - Pipeline – continued

Kinder Morgan Finance Corp., 5.35%, 2011(a) $ 3,264,000 $ 3,256,320

$ 11,362,836

Network & Telecom – 4.5%

France Telecom S.A., 7.2%, 2006 $ 5,141,000 $ 5,150,166

GTE Corp., 7.51%, 2009 2,200,000 2,314,303

SBC Communications, Inc., 4.125%, 2009 5,830,000 5,614,908

Telecom Italia Capital, 4%, 2008 4,100,000 3,968,927

Telecom Italia Capital, 4%, 2010 1,100,000 1,044,946

Telecom Italia Capital, 4.875%, 2010 2,227,000 2,173,501

Telecomunicaciones de Puerto Rico, Inc., 6.65%, 2006 4,020,000 4,035,252

Telecomunicaciones de Puerto Rico, Inc., 6.8%, 2009 2,850,000 2,949,750

Telefonica Europe B.V., 7.75%, 2010 2,500,000 2,727,018

TELUS Corp., 7.5%, 2007 2,000,000 2,058,642

$ 32,037,413

Pollution Control – 0.2%

Waste Management, Inc., 7%, 2006 $ 1,501,000 $ 1,521,211

Printing & Publishing – 0.5%

Reed Elsevier Capital, Inc., 6.125%, 2006 $ 3,713,000 $ 3,732,965

Real Estate – 2.9%

EOP Operating LP, 8.375%, 2006 $ 3,445,000 $ 3,458,825

EOP Operating LP, 6.8%, 2009 3,290,000 3,425,245

EOP Operating LP, 4.65%, 2010 2,000,000 1,940,440

Kimco Realty Corp., 7.5%, 2006 2,900,000 2,953,926

Simon Property Group LP, 7.125%, 2009 1,900,000 1,995,847

Simon Property Group LP, 4.6%, 2010 2,258,000 2,200,859

Vornado Realty Trust, 5.625%, 2007 4,800,000 4,815,302

$ 20,790,444

Retailers – 0.4%

May Department Stores Co., 5.95%, 2008 $ 2,937,000 $ 2,990,154

Supermarkets – 0.8%

Kroger Co., 7.8%, 2007 $ 3,110,000 $ 3,220,819

Safeway, Inc., 4.95%, 2010 984,000 958,429

Safeway, Inc., 6.5%, 2011 1,250,000 1,295,108

$ 5,474,356

Supranational – 0.2%

Corporacion Andina de Fomento, 7.25%, 2007 $ 1,550,000 $ 1,582,665

Telecommunications - Wireless – 1.2%

AT&T Wireless Services, Inc., 7.35%, 2006 $ 2,162,000 $ 2,166,320

Sprint Capital Corp., 4.78%, 2006 6,200,000 6,191,816

$ 8,358,136

Tobacco – 0.5%

Philip Morris Capital Corp., 7.5%, 2009 $ 3,040,000 $ 3,209,632

U.S. Government Agencies – 2.8%

Federal Home Loan Bank, 2.25%, 2006 $ 8,305,000 $ 8,248,127

Federal Home Loan Bank, 4.625%, 2008 5,200,000 5,185,372

Freddie Mac, 4.875%, 2007 4,100,000 4,100,754

Small Business Administration, 5.1%, 2016 2,320,000 2,329,184

$ 19,863,437

5

MFS Limited Maturity Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

U.S. Treasury Obligations – 3.4%

U.S. Treasury Notes, 6.875%, 2006 $ 4,000,000 $ 4,025,936

U.S. Treasury Notes, 3%, 2006 5,983,000 5,896,994

U.S. Treasury Notes, 6.125%, 2007(f) 7,500,000 7,674,023

U.S. Treasury Notes, 2.625%, 2008 2,990,000 2,868,881

U.S. Treasury Notes, 4.375%, 2008 1,280,000 1,276,200

U.S. Treasury Notes, 3.5%, 2009 2,275,000 2,194,754

$ 23,936,788

Utilities - Electric Power – 7.2%

Constellation Energy Group, Inc., 6.35%, 2007 $ 5,861,000 $ 5,940,229

DTE Energy Co., 6.45%, 2006 3,250,000 3,264,316

Empresa Nacional de Electricidad S.A., 8.5%, 2009 2,325,000 2,523,604

FirstEnergy Corp., 5.5%, 2006 3,285,000 3,293,988

FPL Group Capital, Inc., 3.25%, 2006 4,320,000 4,306,846

FPL Group Capital, Inc., 5.551%, 2008 3,927,900 3,955,776

MidAmerican Energy Holdings Co., 4.625%, 2007 4,140,000 4,100,500

MidAmerican Energy Holdings Co., 3.5%, 2008 1,076,000 1,035,736

Oncor Electric Delivery Co., 5%, 2007 3,826,000 3,814,503

Pacific Gas & Electric Co., 3.6%, 2009 2,585,000 2,472,426

Progress Energy, Inc., 6.05%, 2007 2,610,000 2,635,909

PSEG Power LLC, 6.875%, 2006 3,225,000 3,237,113

TXU Energy Co., 6.125%, 2008 1,425,000 1,444,505

Virginia Electric & Power Co., 5.375%, 2007 1,250,000 1,252,953

Virginia Electric & Power Co., 4.1%, 2008 4,100,000 3,976,721

Wisconsin Energy Corp., 5.875%, 2006 3,497,000 3,501,459

$ 50,756,584

Total Bonds $ 689,775,726

Short-Term Obligation – 2.4%

Sheffield Receivables Corp., 4.48%, due 2/01/06(y)(t) $ 16,800,000 $ 16,800,000

Total Investments(k) $ 706,575,726

Other Assets, Less Liabilities – 0% (315,601 )

Net Assets – 100.0% $ 706,260,125

(k) As of January 31, 2006, the fund had one security representing $2,572,881 and 0.4% of net assets that was fair valued in

accordance with the policies adopted by the Board of Trustees.

(t) Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities

Act of 1933.

(f) All or a portion of the security has been segregated as collateral for an open futures contract.

(a) SEC Rule 144A restriction.

(y) The rate shown represents an annualized yield at time of purchase.

(i) Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the

notional principal and does not reflect the cost of the security.

The following abbreviation is used in the Portfolio of Investments and is defined:

FRN Floating Rate Note. The interest rate is the rate in effect as of period end.

See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual

report.

6

MFS Limited Maturity Fund

Supplemental Schedules (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on a federal income tax basis, are as follows:

Aggregate Cost	$	727,740,487
Gross unrealized depreciation	$	(21,438,797	)
Gross unrealized appreciation		274,036
Net unrealized appreciation (depreciation)	$	(21,164,761	)

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments Futures Contracts

				Unrealized
			Expiration	Appreciation
	Contracts	Value	Date	(Depreciation)

U.S. Treasury Bond (Short)	266	$ 28,125,344	Mar-06	$ 95,655
At January, 31, 2006, the fund had sufficient cash and/or securities to cover any margin requirements under
these derivative contracts.
MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.
					7

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 97.1%

Advertising & Broadcasting – 0.7%

Clear Channel Communications, Inc., 4.625%, 2008 $ 1,030,000 $ 1,014,693

Liberty Media Corp., FRN, 5.9913%, 2006 659,000 662,414

News America, Inc., 4.75%, 2010 1,000,000 980,670

$ 2,657,777

Airlines – 0.1%

American Airlines Corp., 3.857%, 2010 $ 316,947 $ 304,325

Continental Airlines, Inc., 6.545%, 2019 69,960 70,173

$ 374,498

Alcoholic Beverages – 0.7%

Miller Brewing Co., 4.25%, 2008(a) $ 2,750,000 $ 2,692,255

Asset Backed & Securitized – 20.7%

Accredited Mortgage Loan Trust, FRN, 4.74%, 2035 $ 1,759,000 $ 1,759,614

Aesop Funding II LLC, 2.78%, 2007(a) 1,200,000 1,183,752

AmeriCredit Automobile Receivables Trust, 3.67%, 2009 1,847,065 1,838,413

Banc of America Commercial Mortgage, Inc., FRN, 5.182%, 2047 1,400,000 1,396,898

Bayview Commercial Asset Trust, FRN, 4.84%, 2035(a) 1,655,407 1,656,249

Bayview Financial Acquisition Trust, FRN, 5.483%, 2045 1,668,000 1,667,979

Bayview Financial Acquisition Trust, FRN, 5.402%, 2035 1,552,000 1,550,546

Bear Stearns Commercial Mortgage Securities, Inc., 4.945%, 2041 1,500,000 1,475,751

Brascan Real Estate, FRN, 6.201%, 2040(a) 418,000 412,900

Brazilian Merchant Voucher Receivables Ltd., 5.911%, 2011(a) 288,669 288,308

Capital One Auto Finance Trust, 4.79%, 2009 139,094 138,778

Capital One Auto Finance Trust, 2.47%, 2010 2,820,000 2,770,317

Capital One Auto Finance Trust, 3.18%, 2010 1,000,000 982,177

Centex Home Equity Loan Trust, 3.9%, 2024 276,000 272,830

Chase Commercial Mortgage Securities Corp., 7.37%, 2029 114,642 115,936

Citibank Credit Card Issuance Trust, 6.65%, 2008 500,000 502,242

Citigroup/Deutsche Bank Commercial Mortgage Trust, FRN, 5.2253%, 2044 1,810,000 1,809,939

Commercial Mortgage Acceptance Corp., 7.03%, 2031 1,070,000 1,124,440

Commercial Mortgage Asset Trust, FRN, 0.8872%, 2032(a)(i) 4,890,360 218,989

Commercial Mortgage Pass-Through Certificate, FRN, 4.66%, 2017(a) 1,500,000 1,499,778

Countrywide Asset-Backed Certificates, FRN, 4.575%, 2035 668,000 658,186

Countrywide Asset-Backed Certificates, FRN, 5.43%, 2036 1,107,000 1,106,308

CPS Auto Receivables Trust, 3.52%, 2009(a) 41,034 40,778

CPS Auto Receivables Trust, 2.89%, 2009(a) 73,018 71,284

Credit-Based Asset Servicing and Securities, FRN, 5.303%, 2035 2,768,871 2,761,517

CRIIMI MAE Commercial Mortgage Trust, 7%, 2033(a) 138,847 140,802

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031 595,075 607,821

DLJ Commercial Mortgage Corp., 7.95%, 2010 1,000,000 1,107,070

Drive Auto Receivables Trust, 2.77%, 2008(a) 365,874 365,374

Drivetime Auto Owner Trust, FRN, 1.918%, 2008(a) 305,460 302,453

E*TRADE RV & Marine Trust, 3.62%, 2018 912,000 874,333

Falcon Franchise Loan LLC, 7.382%, 2010(a) 278,967 289,079

Falcon Franchise Loan LLC, FRN, 3.7836%, 2023(i) 1,080,346 175,843

First Auto Receivables Group Trust, 2.436%, 2007(a) 139,330 138,894

First Union National Bank Commercial Mortgage Trust, FRN, 0.9542%, 2043(a)(i) 7,916,594 314,402

Gramercy Real Estate CDO Ltd., FRN, 4.9423%, 2035 1,200,000 1,201,080

Holmes Financing PLC, FRN, 5.32%, 2040 470,000 470,705

Household Automotive Trust, 3.44%, 2009 299,369 296,729

IKON Receivables Funding LLC, 2.33%, 2007 84,278 84,079

IKON Receivables Funding LLC, 3.27%, 2011 135,000 133,383

IMPAC CMB Trust, FRN, 4.9%, 2034 1,123,119 1,124,752

1

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Asset Backed & Securitized – continued

IMPAC CMB Trust, FRN, 4.99%, 2034 $ 561,559 $ 562,846

J.P. Morgan Chase Commercial Mortgage Securities Corp., 4.865%, 2046 2,195,695 2,155,343

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 4.936%, 2042 1,731,853 1,687,870

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3646%, 2043 1,830,177 1,834,147

J.P. Morgan Commercial Mortgage Finance Corp., 7.325%, 2031 959 960

Lehman Brothers Commercial Conduit Mortgage Trust, 6.48%, 2008 906,340 923,955

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4927%, 2035(i) 6,623,193 120,257

Long Beach Auto Receivables Trust, FRN, 2.841%, 2010 796,000 777,405

Merrill Lynch Mortgage Investors, Inc., FRN, 7.073%, 2030 170,000 175,054

Morgan Stanley ABS Capital I, FRN, 4.74%, 2035 686,141 686,674

Morgan Stanley Capital I, Inc., 6.48%, 2030 500,000 510,830

Morgan Stanley Capital I, Inc., FRN, 1.021%, 2031(a)(i) 4,169,704 103,284

Mortgage Capital Funding, Inc., FRN, 0.7801%, 2031(i) 1,888,483 26,871

Multi-Family Capital Access One, Inc., 6.65%, 2024 560,060 576,504

Nationslink Funding Corp., 6.476%, 2030 441,949 453,876

New Century Home Equity Loan Trust, FRN, 4.532%, 2035 2,000,000 1,961,662

Nomura Asset Acceptance Corp., FRN, 4.423%, 2034 1,100,000 1,089,022

NovaStar Mortgage Funding Trust, FRN, 4.82%, 2034 350,870 351,077

Ownit Mortgage Loan Asset-Backed Certificates, FRN, 5.29%, 2036 2,588,328 2,588,328

People's Choice Home Loan Securities Trust, FRN, 4.8%, 2031 3,000,000 3,003,872

Popular ABS Mortgage Pass-Through Trust, FRN, 4.62%, 2035 1,051,457 1,037,259

Putnam Structured Product Funding, FRN, 4.92%, 2008(a) 419,492 419,492

Residential Asset Mortgage Products, Inc., FRN, 4.9708%, 2034 2,100,000 2,046,990

Residential Asset Mortgage Products, Inc., FRN, 4.74%, 2035 2,621,286 2,623,172

Residential Funding Mortgage Securities, Inc., FRN, 5.32%, 2035 3,000,000 2,986,142

RMAC PLC, FRN, 4.68%, 2036(a) 420,000 419,803

SLM Student Loan Trust, 2.99%, 2022(a) 1,000,000 978,410

Structured Asset Securities Corp., FRN, 4.78%, 2034 220,368 220,467

Structured Asset Securities Corp., FRN, 4.67%, 2035 1,887,955 1,867,050

Structured Asset Securities Corp., FRN, 4.77%, 2035(a) 1,993,687 1,993,908

Superannuation Members Home Loans Global Trust, FRN, 4.77%, 2029 149,912 149,890

Thornburg Mortgage Securities Trust, FRN, 4.87%, 2043 173,629 174,638

TIAA Real Estate CDO Ltd., 7.17%, 2032(a) 350,553 358,292

Triad Auto Receivables Trust, 2.48%, 2008 360,554 359,019

Triad Auto Receivables Trust, 3.24%, 2009 322,334 319,263

Wachovia Bank Commercial Mortgage Trust, 4.935%, 2042 1,150,000 1,121,143

Wachovia Bank Commercial Mortgage Trust, FRN, 5.083%, 2042 1,150,000 1,132,847

Wachovia Bank Commercial Mortgage Trust, FRN, 5.118%, 2042 1,400,000 1,381,343

Wachovia Bank Commercial Mortgage Trust, FRN, 5.316%, 2044 1,470,000 1,473,913

Washington Mutual, Inc., FRN, 3.177%, 2033 287,980 284,325

$ 75,867,911

Automotive – 2.3%

DaimlerChrysler North America Holdings, FRN, 5.21%, 2008 $ 1,200,000 $ 1,203,971

DaimlerChrysler Services North America LLC, 4.75%, 2008 750,000 741,961

Ford Motor Credit Co., 5.8%, 2009 1,906,000 1,729,329

General Motors Acceptance Corp., 6.125%, 2006 600,000 593,636

General Motors Acceptance Corp., 5.625%, 2009 1,650,000 1,545,946

General Motors Corp., 7.2%, 2011 293,000 235,865

Johnson Controls, Inc., 5.25%, 2011 2,530,000 2,522,319

$ 8,573,027

Banks & Credit Companies – 11.1%

Banco Mercantil del Norte S.A., 5.875% to 2009, FRN to 2014(a) $ 750,000 $ 744,375

Bank of America Corp., 7.4%, 2011 1,250,000 1,370,911

2

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Banks & Credit Companies – continued

BANK ONE Corp., 7.875%, 2010 $ 2,165,000 $ 2,398,110

Barclays Bank PLC, 8.55% to 2011, FRN to 2049(a) 1,170,000 1,339,215

BNP Paribas, 5.186% to 2015, FRN to 2049(a) 2,000,000 1,921,762

Bosphorus Financial Services Ltd., FRN, 6.55%, 2012(a) 600,000 603,086

Chuo Mitsui Trust & Banking Co., 5.506% to 2015, FRN to 2049(a) 1,209,000 1,174,795

Citigroup, Inc., 5%, 2014 324,000 316,570

Commercial Credit Co., 6.25%, 2008 750,000 768,653

Credit Suisse First Boston (USA), Inc., 4.7%, 2009 1,460,000 1,443,997

Credit Suisse First Boston (USA), Inc., 4.875%, 2010 2,000,000 1,977,510

DBS Capital Funding Corp., 7.657% to 2011, FRN to 2049(a) 1,135,000 1,248,562

DEPFA Bank PLC, 3.625%, 2008 1,250,000 1,212,025

HBOS Capital Funding LP, 6.071% to 2014, FRN to 2049(a) 1,750,000 1,790,908

J.P. Morgan Chase & Co., 5.125%, 2014 1,500,000 1,470,774

Kazkommerts International B.V., 8.5%, 2013(a) 752,000 814,040

Mizuho Financial Group, Inc., 5.79%, 2014(a) 1,017,000 1,041,552

Natexis AMBS Co. LLC, 8.44% to 2008, FRN to 2049(a) 2,005,000 2,147,920

National Westminster Bank PLC, 7.75% to 2007, FRN to 2049 550,000 572,333

NationsBank Corp., 7.5%, 2006 125,000 126,968

Nordea Bank AB, 5.424% to 2015, FRN to 2049(a) 1,978,000 1,942,194

Popular North America, Inc., 6.125%, 2006 605,000 608,797

Popular North America, Inc., 3.875%, 2008 750,000 723,155

Popular North America, Inc., 4.7%, 2009 1,200,000 1,176,757

Resona Bank Ltd., 5.85% to 2016, FRN to 2049(a) 1,453,000 1,444,297

Royal Bank of Scotland Group PLC, 9.118%, 2049 1,510,000 1,719,798

Socgen Real Estate LLC, 7.64% to 2007, FRN to 2049(a) 1,844,000 1,911,778

Spintab AB, 7.5% to 2006, FRN to 2049 175,000 177,474

Spintab AB, 7.5% to 2006, FRN to 2049(a) 150,000 152,121

Turanalem Finance B.V., 10%, 2007 550,000 581,625

UFJ Finance Aruba AEC, 6.75%, 2013 980,000 1,060,233

UniCredito Italiano Capital Trust II, 9.2% to 2010, FRN to 2049(a) 717,000 825,416

Wachovia Capital Trust III, 5.8% to 2011, FRN to 2049 2,600,000 2,608,034

Wachovia Corp., 7.8%, 2010 250,000 277,021

Wachovia Corp., 6.3%, 2008 700,000 721,069

Wells Fargo & Co., 6.45%, 2011 200,000 212,489

$ 40,626,324

Broadcast & Cable TV – 1.0%

Comcast Cable Communications, Inc., 6.75%, 2011 $ 4,000 $ 4,213

Comcast Corp., 5.85%, 2010 1,000,000 1,015,640

Comcast Corp., 5.45%, 2010 300,000 300,799

Cox Communications, Inc., 4.625%, 2010 900,000 869,153

Cox Communications, Inc., 4.625%, 2013 600,000 555,644

TCI Communications, Inc., 9.8%, 2012 150,000 179,178

Time Warner Entertainment Co. LP, 7.25%, 2008 750,000 783,716

$ 3,708,343

Brokerage & Asset Managers – 3.0%

AMVESCAP PLC, 4.5%, 2009 $ 1,199,000 $ 1,171,171

Goldman Sachs Group, Inc., 5%, 2011 870,000 864,034

Goldman Sachs Group, Inc., 5.7%, 2012 1,650,000 1,681,124

Lehman Brothers Holdings E-Capital, FRN, 5.15%, 2065(a) 1,098,000 1,100,955

Lehman Brothers Holdings, Inc., 3.95%, 2009 2,300,000 2,203,589

Merrill Lynch & Co., Inc., 4.25%, 2010 1,600,000 1,549,920

Merrill Lynch & Co., Inc., 5.45%, 2014 1,500,000 1,509,030

3

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Brokerage & Asset Managers – continued

Morgan Stanley Group, Inc., 4.75%, 2014 $ 1,000,000 $ 951,577

$ 11,031,400

Building – 1.0%

CRH America, Inc., 6.95%, 2012 $ 1,250,000 $ 1,346,755

Hanson PLC, 7.875%, 2010 2,000,000 2,198,454

$ 3,545,209

Chemicals – 1.3%

Chevron Phillips Chemical Co. LLC, 5.375%, 2007 $ 1,900,000 $ 1,901,121

Dow Chemical Co., 5.75%, 2008 350,000 357,557

Yara International A.S.A., 5.25%, 2014(a) 2,700,000 2,625,475

$ 4,884,153

Conglomerates – 0.3%

Kennametal, Inc., 7.2%, 2012 $ 525,000 $ 567,636

Tyco International Group S.A., 5.8%, 2006 533,000 534,797

$ 1,102,433

Consumer Goods & Services – 0.5%

Cendant Corp., 6.875%, 2006 $ 155,000 $ 156,329

Fortune Brands, Inc., 5.125%, 2011 1,644,000 1,634,373

$ 1,790,702

Defense Electronics – 0.5%

BAE Systems Holdings, Inc., 4.75%, 2010(a) $ 380,000 $ 371,815

BAE Systems Holdings, Inc., 6.4%, 2011(a) 1,260,000 1,325,454

Raytheon Co., 6.15%, 2008 12,000 12,323

$ 1,709,592

Emerging Market Quasi-Sovereign – 0.6%

Export-Import Bank of Korea, 5.25%, 2014(a) $ 800,000 $ 795,909

Gazprom, 9.125%, 2007 800,000 834,000

Pemex Project Funding Master Trust, 7.375%, 2014 375,000 414,000

$ 2,043,909

Emerging Market Sovereign – 0.7%

Banque Centrale de Tunisie, 7.375%, 2012 $ 590,000 $ 649,737

Republic of South Africa, 9.125%, 2009 750,000 838,125

State of Israel, 5.125%, 2014 1,000,000 977,297

$ 2,465,159

Energy - Independent – 1.3%

Ocean Energy, Inc., 4.375%, 2007 $ 45,000 $ 44,429

Ocean Energy, Inc., 7.25%, 2011 1,710,000 1,876,857

Pioneer Natural Resource Co., 6.5%, 2008 1,000,000 1,017,605

Ras Laffan Liquefied Natural Gas Co. Ltd., 5.298%, 2020(a) 2,000,000 1,950,540

$ 4,889,431

Entertainment – 0.8%

Time Warner, Inc., 6.875%, 2012 $ 100,000 $ 106,202

Walt Disney Co., 6.75%, 2006 1,130,000 1,133,573

Walt Disney Co., 6.375%, 2012 1,600,000 1,688,939

$ 2,928,714

Financial Institutions – 1.8%

Capital One Bank, 4.25%, 2008 $ 784,000 $ 765,135

Countrywide Home Loans, Inc., 5.5%, 2007 240,000 240,804

Countrywide Home Loans, Inc., 4.125%, 2009 1,700,000 1,635,903

General Electric Capital Corp., 8.7%, 2007 133,000 137,970

4

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Financial Institutions – continued

Household Finance Corp., 4.75%, 2009 $ 2,800,000 $ 2,769,908

Household Finance Corp., 7%, 2012 170,000 184,446

HSBC Finance Corp., 6.75%, 2011 20,000 21,344

International Lease Finance Corp., 5%, 2010 868,000 860,845

$ 6,616,355

Food & Non-Alcoholic Beverages – 0.9%

Cadbury Schweppes PLC, 3.875%, 2008(a) $ 2,100,000 $ 2,034,427

General Mills, Inc., 6%, 2012 482,000 498,685

Kraft Foods, Inc., 4%, 2008 850,000 826,068

$ 3,359,180

Forest & Paper Products – 0.1%

MeadWestvaco Corp., 6.85%, 2012 $ 345,000 $ 363,783

Weyerhaeuser Co., 6.75%, 2012 80,000 84,473

$ 448,256

Gaming & Lodging – 0.5%

Carnival Corp., 3.75%, 2007 $ 500,000 $ 488,758

Harrah's Operating Co., Inc., 5.625%, 2015 1,409,000 1,377,431

MGM Mirage, Inc., 8.5%, 2010 3,000 3,255

$ 1,869,444

Industrial – 0.2%

Steelcase, Inc., 6.375%, 2006 $ 700,000 $ 699,786

Insurance – 1.6%

American International Group, Inc., 4.25%, 2013 $ 750,000 $ 705,099

ASIF Global Financing XVIII, 3.85%, 2007(a) 1,000,000 979,806

Hartford Financial Services Group, Inc., 4.7%, 2007 150,000 148,879

ING Groep N.V., 5.775% to 2015, FRN to 2049 2,285,000 2,296,153

John Hancock Global Funding II, 3.5%, 2009(a) 1,250,000 1,197,501

MetLife, Inc., 5.375%, 2012 300,000 303,256

Prudential Insurance Co., 7.65%, 2007(a) 335,000 347,081

$ 5,977,775

Insurance - Property & Casualty – 2.0%

ACE INA Holdings, Inc., 5.875%, 2014 $ 1,700,000 $ 1,744,928

AIG SunAmerica Global Financing IV, 5.85%, 2006(a) 260,000 260,000

AIG SunAmerica Global Financing IX, 5.1%, 2007(a) 375,000 375,267

AXIS Capital Holdings Ltd., 5.75%, 2014 1,000,000 994,515

Fund American Cos., Inc., 5.875%, 2013 1,249,000 1,249,761

Safeco Corp., 4.2%, 2008 930,000 913,963

St. Paul Travelers Cos., Inc., 5.5%, 2015 1,656,000 1,658,562

$ 7,196,996

International Market Quasi-Sovereign – 1.9%

Hydro-Quebec, 6.3%, 2011 $ 265,000 $ 281,348

KfW Bankengruppe, 2.375%, 2006 670,000 659,103

KfW Bankengruppe, 3.25%, 2007 1,600,000 1,564,802

KfW Bankengruppe, 4.625%, 2008 2,391,000 2,382,247

Landesbank Baden-Wurttemberg, 5.125%, 2007 300,000 300,714

Province of Manitoba, 4.25%, 2006 475,000 472,739

Province of Ontario, 6%, 2006 1,200,000 1,200,730

$ 6,861,683

International Market Sovereign – 0.5%

Bayerische Landesbank Girozentrale, 3.2%, 2009 $ 2,000,000 $ 1,896,070

5

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Machinery & Tools – 0.1%

Ingersoll Rand Co., 6.25%, 2006 $ 460,000 $ 461,819

Medical & Health Technology & Services – 0.2%

Baxter International, Inc., 9.5%, 2008 $ 600,000 $ 653,724

Metals & Mining – 0.1%

Corporacion Nacional del Cobre de Chile, 6.375%, 2012(a) $ 250,000 $ 265,803

Mortgage Backed – 10.9%

Fannie Mae, 5.722%, 2009 $ 71,000 $ 71,754

Fannie Mae, 6.022%, 2010 3,500,000 3,648,810

Fannie Mae, 4.557%, 2011 2,947,446 2,892,877

Fannie Mae, 4.845%, 2013 770,415 757,375

Fannie Mae, 4.667%, 2014 944,064 917,693

Fannie Mae, 4.846%, 2014 1,457,195 1,431,544

Fannie Mae, 5.412%, 2014 878,444 901,884

Fannie Mae, 4.62%, 2015 493,208 476,043

Fannie Mae, 7%, 2015 1,722 1,779

Fannie Mae, 4.925%, 2015 1,090,303 1,075,033

Fannie Mae, 5.5%, 2016 - 2033 1,069,467 1,072,428

Fannie Mae, 6.5%, 2017 101,930 104,743

Fannie Mae, 6%, 2017 160,542 164,110

Fannie Mae, 5%, 2018 1,620,639 1,603,835

Fannie Mae, 4.5%, 2018 877,464 854,190

Freddie Mac, 4.125%, 2010 3,110,000 3,023,791

Freddie Mac, 6%, 2017 98,937 100,842

Freddie Mac, 5.5%, 2017 - 2034 4,457,919 4,435,328

Freddie Mac, 5%, 2018 - 2024 14,542,411 14,419,233

Freddie Mac, 3%, 2021 1,300,000 1,269,457

Freddie Mac, 3.108%, 2035 139,432 138,748

Ginnie Mae, 6%, 2034 418,020 428,614

$ 39,790,111

Natural Gas - Pipeline – 1.5%

CenterPoint Energy Resources Corp., 7.875%, 2013 $ 750,000 $ 851,855

Enterprise Products Partners LP, 4.95%, 2010 1,700,000 1,666,213

Kinder Morgan Energy Partners LP, 5.35%, 2007 120,000 120,056

Kinder Morgan Energy Partners LP, 6.75%, 2011 110,000 116,883

Kinder Morgan Finance Corp., 5.35%, 2011(a) 1,596,000 1,592,245

Kinder Morgan, Inc., 6.8%, 2008 1,000,000 1,030,517

$ 5,377,769

Network & Telecom – 3.3%

AT&T, Inc., 5.1%, 2014 $ 2,000,000 $ 1,939,024

Deutsche Telekom International Finance B.V., 5.25%, 2013 200,000 197,099

France Telecom S.A., 7.2%, 2006 905,000 906,614

France Telecom S.A., 7.75%, 2011 300,000 332,836

GTE Corp., 7.51%, 2009 600,000 631,174

Telecom Italia Capital, 4%, 2010 1,000,000 949,951

Telecom Italia Capital, 4.875%, 2010 1,023,000 998,424

Telecom Italia Capital, 5.25%, 2013 1,500,000 1,457,080

Telecomunicaciones de Puerto Rico, Inc., 6.65%, 2006 530,000 532,011

Telefonica Europe B.V., 7.75%, 2010 1,300,000 1,418,049

TELUS Corp., 7.5%, 2007 850,000 874,923

Verizon New York, Inc., 6.875%, 2012 1,875,000 1,965,234

$ 12,202,419

6

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Oil Services – 0.3%

Halliburton Co., 5.5%, 2010 $ 1,100,000 $ 1,118,551

Pharmaceuticals – 0.7%

Teva Pharmaceutical Finance LLC, 5.55%, 2016 $ 1,463,000 $ 1,459,777

Wyeth, 5.5%, 2013 1,000,000 1,006,365

$ 2,466,142

Pollution Control – 0.1%

Waste Management, Inc., 7%, 2006 $ 90,000 $ 91,212

Waste Management, Inc., 6.375%, 2012 250,000 263,322

$ 354,534

Printing & Publishing – 0.1%

Reed Elsevier Capital, Inc., 6.125%, 2006 $ 365,000 $ 366,963

Railroad & Shipping – 0.3%

Union Pacific Corp., 6.125%, 2012 $ 1,000,000 $ 1,044,871

Real Estate – 2.6%

EOP Operating LP, 8.375%, 2006 $ 655,000 $ 657,629

EOP Operating LP, 6.8%, 2009 885,000 921,381

EOP Operating LP, 4.65%, 2010 2,000,000 1,936,924

Kimco Realty Corp., 7.5%, 2006 300,000 305,578

Kimco Realty Corp., 6%, 2012 1,649,000 1,707,135

Simon Property Group LP, 6.375%, 2007 125,000 127,512

Simon Property Group LP, 7.125%, 2009 1,100,000 1,155,491

Simon Property Group LP, 4.6%, 2010 909,000 885,997

Vornado Realty Trust, 5.625%, 2007 730,000 732,327

Vornado Realty Trust, 4.5%, 2009 1,000,000 971,426

$ 9,401,400

Retailers – 0.8%

Limited Brands, Inc., 5.25%, 2014 $ 1,500,000 $ 1,406,691

May Department Stores Co., 5.95%, 2008 1,406,000 1,431,446

$ 2,838,137

Supermarkets – 0.5%

Kroger Co., 7.8%, 2007 $ 815,000 $ 844,041

Safeway, Inc., 4.95%, 2010 486,000 473,370

Safeway, Inc., 6.5%, 2011 630,000 652,734

$ 1,970,145

Supranational – 0.7%

Central American Bank, 4.875%, 2012(a) $ 2,000,000 $ 1,926,048

Corporacion Andina de Fomento, 7.25%, 2007 425,000 433,956

Corporacion Andina de Fomento, 6.875%, 2012 200,000 215,728

$ 2,575,732

Telecommunications - Wireless – 0.8%

AT&T Wireless Services, Inc., 7.35%, 2006 $ 236,000 $ 236,472

Sprint Capital Corp., 4.78%, 2006 1,450,000 1,448,086

Sprint Capital Corp., 7.625%, 2011 1,000,000 1,100,160

$ 2,784,718

Tobacco – 0.6%

Altria Group, Inc., 7%, 2013 $ 568,000 $ 617,289

Philip Morris Capital Corp., 7.5%, 2009 1,300,000 1,372,540

R.J. Reynolds Tobacco Holdings, Inc., 7.25%, 2012 125,000 128,125

$ 2,117,954

7

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Transportation - Services – 0%

FedEx Corp., 9.65%, 2012 $ 100,000 $ 122,926

U.S. Government Agencies – 6.9%

Aid to Egypt, 4.45%, 2015 658,000 $ 638,918

Aid to Israel, 6.6%, 2008 9,826 10,016

Fannie Mae, 7.25%, 2010 2,425,000 2,632,951

Fannie Mae, 6.125%, 2012 315,000 336,014

Fannie Mae, 5.25%, 2012 1,000,000 1,006,837

Federal Home Loan Bank, 2.25%, 2006 1,700,000 1,688,358

Federal Home Loan Bank, 5.25%, 2014 6,000,000 6,157,602

Freddie Mac, 4.875%, 2007 3,000,000 3,000,552

Freddie Mac, 6.875%, 2010 1,038,000 1,125,091

Freddie Mac, 5.125%, 2012 2,000,000 2,028,516

Small Business Administration, 4.93%, 2024 870,454 862,089

Small Business Administration, 5.18%, 2024 2,771,023 2,780,977

Small Business Administration, 4.76%, 2025 1,752,000 1,709,402

Small Business Administration, 5.39%, 2025 1,131,000 1,144,571

$ 25,121,894

U.S. Treasury Obligations – 4.9%

U.S. Treasury Notes, 3%, 2006 $ 947,000 $ 933,387

U.S. Treasury Notes, 2.625%, 2008 1,500,000 1,439,238

U.S. Treasury Notes, 4.375%, 2008 580,000 578,278

U.S. Treasury Notes, 6.5%, 2010 2,759,000 2,958,812

U.S. Treasury Notes, 4.25%, 2013 3,500,000 3,435,467

U.S. Treasury Notes, 4%, 2014(f) 1,825,000 1,757,988

U.S. Treasury Notes, 4.75%, 2014 450,000 456,223

U.S. Treasury Notes, 4.25%, 2014 2,000,000 1,956,484

U.S. Treasury Notes, 4.125%, 2015 500,000 484,277

U.S. Treasury Notes, 4.25%, 2015 1,080,000 1,055,447

U.S. Treasury Notes, 4.5%, 2015 2,780,000 2,773,592

$ 17,829,193

Utilities - Electric Power – 5.6%

Beaver Valley Funding Corp., 9%, 2017 $ 225,000 $ 260,014

Constellation Energy Group, Inc., 6.35%, 2007 2,330,000 2,361,497

DTE Energy Co., 6.45%, 2006 750,000 753,304

DTE Energy Co., 7.05%, 2011 750,000 804,624

Duke Capital LLC, 6.25%, 2013 1,000,000 1,039,838

Empresa Nacional de Electricidad S.A., 8.35%, 2013 273,000 307,778

Exelon Generation Co. LLC, 6.95%, 2011 1,225,000 1,314,459

FirstEnergy Corp., 5.5%, 2006 600,000 601,642

FirstEnergy Corp., 6.45%, 2011 1,540,000 1,618,939

FPL Group Capital, Inc., 3.25%, 2006 500,000 498,477

FPL Group Capital, Inc., 5.551%, 2008 1,868,200 1,881,459

HQI Transelec Chile S.A., 7.875%, 2011 1,135,000 1,245,459

MidAmerican Energy Holdings Co., 4.625%, 2007 310,000 307,042

MidAmerican Energy Holdings Co., 3.5%, 2008 119,000 114,547

Oncor Electric Delivery Co., 5%, 2007 325,000 324,023

Pacific Gas & Electric Co., 3.6%, 2009 607,000 580,566

Progress Energy, Inc., 6.05%, 2007 610,000 616,055

Progress Energy, Inc., 5.625%, 2016 1,264,000 1,252,203

PSEG Power LLC, 6.875%, 2006 430,000 431,615

System Energy Resources, Inc., 5.129%, 2014(a) 856,620 822,852

TXU Energy Co., 6.125%, 2008 375,000 380,133

8

MFS Intermediate Investment Grade Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued

Issuer Shares/Par Value ($)

Bonds – continued

Utilities - Electric Power – continued

TXU Energy Co., 7%, 2013 $ 700,000 $ 740,873

Virginia Electric & Power Co., 5.375%, 2007 363,000 363,857

Virginia Electric & Power Co., 4.1%, 2008 1,226,000 1,189,137

Wisconsin Energy Corp., 5.875%, 2006 894,000 895,140

$ 20,705,533

Total Bonds $ 355,386,720

Short-Term Obligation – 2.1%

Alpine Securitization Corp., 4.48%, due 2/01/06(t)(y) $ 7,656,000 $ 7,656,000

Total Investments (k) $ 363,042,720

Other Assets, Less Liabilities – 0.8% 2,922,398

Net Assets – 100.0% $ 365,965,118

(i) Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the

notional principal and does not reflect the cost of the security.

(a) SEC Rule 144A restriction.

(t) Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities

Act of 1933.

(f) All or a portion of the security has been segregated as collateral for an open futures contract.

(y) The rate shown represents an annualized yield at time of purchase.

(k) As of January 31, 2006 the fund had one security representing $419,492 and 0.1% of net assets that was fair valued in

accordance with the policies adopted by the Board of Trustees.

The following abbreviation is used in the Portfolio of Investments and is defined:

FRN Floating Rate Note. The interest rate is the rate in effect as of period end.

See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

9

MFS Intermediate Investment Grade Bond Fund Supplemental Schedules (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund as computed on a federal income tax basis, are as follows:

Aggregate Cost	$	372,079,596
Gross unrealized appreciation	$	522,469
Gross unrealized depreciation		(9,559,345	)
Net unrealized appreciation (depreciation)	$	(9,036,876	)

Aggregate cost includes prior fiscal year end tax adjustments.

(2) Financial Instruments

Futures Contracts

					Unrealized
				Expiration	Appreciation
	Contracts	Value		Date	(Depreciation)

U.S. Treasury Note 5 yr (Short)	80	$	8,458,750	Mar-06	$	31,994
U.S. Treasury Note 10 yr (Short)	6		650,625	Mar-06		1,432

					$	33,426
At January 31, 2006, the fund had sufficient cash and/or securities to cover any margin requirements under these derivative contracts.

MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.
						10

MFS Inflation-Adjusted Bond Fund

PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006

Issuer Shares/Par Value ($)

Bonds – 95.5%

U.S. Government Agencies – 1.6%

Small Business Administration, 4.76%, 2025 $ 93,000 $ 90,739

Small Business Administration, 5.09%, 2025 78,000 77,669

Small Business Administration, 5.36%, 2025 100,000 101,052

Small Business Administration, 5.21%, 2026 90,000 90,188

$ 359,648

U.S. Treasury Inflation Protected Obligations – 93.9%

U.S. Treasury Bonds, 2.375%, 2025 $ 1,816,123 $ 1,919,486

U.S. Treasury Bonds, 2%, 2026 1,125,299 1,123,268

U.S. Treasury Bonds, 3.625%, 2028 1,093,717 1,415,628

U.S. Treasury Bonds, 3.875%, 2029 1,209,524 1,636,372

U.S. Treasury Bonds, 3.375%, 2032 420,914 549,393

U.S. Treasury Notes, 3.625%, 2008 1,262,580 1,305,685

U.S. Treasury Notes, 3.875%, 2009 1,025,617 1,084,910

U.S. Treasury Notes, 0.875%, 2010 1,323,011 1,267,971

U.S. Treasury Notes, 3.5%, 2011 1,472,912 1,584,531

U.S. Treasury Notes, 3%, 2012 1,580,779 1,683,221

U.S. Treasury Notes, 1.875%, 2013 1,748,760 1,738,582

U.S. Treasury Notes, 2%, 2014 3,077,498 3,081,705

U.S. Treasury Notes, 1.625%, 2015 1,122,070 1,088,408

U.S. Treasury Notes, 1.875%, 2015 912,503 903,556

U.S. Treasury Notes, 2%, 2016 629,371 629,936

$ 21,012,652

Total Bonds $ 21,372,300

Short-Term Obligation – 3.2%

Alpine Securitization Corp., 4.48%, due 2/01/06(t) $ 717,000 $ 717,000

Total Investments $ 22,089,300

Other Assets, Less Liabilities – 1.3% 281,664

Net Assets – 100.0% $ 22,370,964

(t) Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities Act of 1933.

See attached schedule.

For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.

1

MFS Inflation-Adjusted Bond Fund

Supplemental Schedule (Unaudited) 01/31/2006

(1) Portfolio Securities

The cost and unrealized appreciation and depreciation in the value of the investments owned by the fund, as computed on
a federal income tax basis, are as follows:

Aggregate Cost	$	22,212,376
Gross unrealized appreciation	$	77,311
Gross unrealized depreciation		(200,387	)
Net unrealized appreciation (depreciation)	$	(123,076	)

Aggregate cost includes prior fiscal year end tax adjustments.

MFS Investment Management®
MFS® investment products are offered through MFS Fund Distributors, Inc., 500 Boylston Street, Boston, MA 02116.

ITEM 2. CONTROLS AND PROCEDURES.

(a) Based upon their evaluation 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 Form N-Q, 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 registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

ITEM 3. EXHIBITS.

File as exhibits as part of this Form a separate certification for each principal executive officer and principal financial officer of the registrant as required by Rule 30a-2(a) under the Act (17 CFR 270.30a -2): Attached hereto.

Notice

A copy of the Amended and Restated Declaration of Trust 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 IX

By (Signature and Title)* MARIA F. DWYER

Maria F. Dwyer, President

Date: March 24, 2006

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: March 24, 2006

By (Signature and Title)* TRACY ATKINSON

Tracy Atkinson, Treasurer (Principal Financial Officer and

Accounting Officer)

Date: March 24, 2006

* Print name and title of each signing officer under his or her signature.

MFS Research Bond Fund
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Bonds – 97.1%

Advertising & Broadcasting – 0.6%

Allbritton Communications Co., 7.75%, 2012	$	4,727,000	$	4,738,810

News America Holdings, 7.75%, 2024		598,000		664,234

News America Holdings, 8.5%, 2025		120,000		142,226

News America, Inc., 6.2%, 2034		3,735,000		3,646,466

			$	9,191,736

Airlines – 0.2%

Continental Airlines, Inc., 6.648%, 2017	$	3,604,422	$	3,573,974

Alcoholic Beverages – 0.3%

Miller Brewing Co., 5.5%, 2013(a)	$	4,978,000	$	5,008,366

Asset Backed & Securitized – 12.5%

Aesop Funding II LLC, 2.78%, 2007(a)	$	3,494,000	$	3,446,691

AmeriCredit Automobile Receivables Trust, 3.67%, 2009		3,208,353		3,193,323

Amresco Commercial Mortgage Funding I, 7%, 2029		558,000		563,787

ARCap, REIT, Inc., "G", 6.1%, 2045(a)		2,354,000		2,134,865

ARCap, REIT, Inc., "H", 6.1%, 2045(a)		1,200,897		1,076,410

Asset Securitization Corp., 7.525%, 2029		1,077,289		1,173,451

Banc of America Commercial Mortgage, Inc., 4.857%, 2043		3,581,684		3,473,793

Banc of America Commercial Mortgage, Inc., FRN, 5.182%, 2047		4,770,000		4,749,869

Bayview Commercial Asset Trust, 0.775%, 2035(i)		50,259,194		4,205,346

Bayview Financial Acquisition Trust, FRN, 5.483% 2041		2,283,000		2,282,972

Bayview Financial Acquisition Trust, FRN, 5.402%, 2035		2,561,000		2,558,600

Bear Stearns Commercial Mortgage Securities, Inc., FRN, 5.116%, 2041		3,434,786		3,396,002

Capital One Auto Finance Trust, 4.79%, 2009		244,712		244,155

Capital One Auto Finance Trust, 3.18%, 2010		2,393,000		2,350,349

Centex Home Equity Loan Trust, 4.14%, 2028		3,939,000		3,881,049

Citigroup/Deutsche Bank Commercial Mortgage Trust, FRN, 5.2253%, 2044		4,080,000		4,079,862

Commercial Mortgage Acceptance Corp., 7.03%, 2031		3,008,000		3,161,043

CPS Auto Receivables Trust, 3.5%, 2009(a)		85,015		84,337

CPS Auto Receivables Trust, 3.52%, 2009(a)		229,177		227,745

CPS Auto Receivables Trust, 2.89%, 2009(a)		388,456		379,230

Credit Suisse First Boston Mortgage Securities Corp., 6.878%, 2018(a)		2,255,000		2,421,125

Credit-Based Asset Servicing and Securities, FRN, 5.303%, 2035		3,149,403		3,141,038

Crest G-Star CDO, 6.95%, 2032(a)		6,526,000		6,777,608

CRIIMI MAE CMBS Corp., 6.701%, 2008(a)		10,000		10,083

CRIIMI MAE Commercial Mortgage Trust, 7%, 2033(a)		1,764,282		1,789,123

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031		1,119,463		1,143,440

Deutsche Mortgage & Asset Receiving Corp., 7.5%, 2031		1,635,000		1,816,696

Drive Auto Receivables Trust, 2.5%, 2009(a)		2,314,000		2,264,892

E*TRADE RV & Marine Trust, 3.62%, 2018		994,000		952,946

Falcon Franchise Loan LLC, 7.382%, 2010(a)		1,706,902		1,768,775

Falcon Franchise Loan LLC, FRN, 3.0686%, 2023(a)(i)		630,679		73,445

Falcon Franchise Loan LLC, FRN, 3.7837%, 2025(i)		9,876,161		1,607,495

First Union National Bank Commercial Mortgage Trust, FRN, 0.9542%, 2043(a)(i)		23,411,527		929,772

First Union-Lehman Brothers Bank of America, FRN, 0.4969%, 2035(i)		25,416,936		480,172

First Union-Lehman Brothers Commercial Mortgage Trust, 7.5%, 2029		798,000		884,373

GE Capital Commercial Mortgage Corp., 6.269%, 2035		2,042,000		2,151,805

Greenwich Capital Commercial Funding Corp., FRN, 5.317%, 2036		5,908,072		5,922,101

Greenwich Capital Commercial Funding Corp., FRN, 5.224%, 2037		3,357,664		3,345,785

Greenwich Capital Commercial Funding Corp., FRN, 4.569%, 2042		5,335,000		5,159,336

Household Automotive Trust, 3.44%, 2009		895,863		887,960

IKON Receivables Funding LLC, 3.27%, 2011		1,994,000		1,970,110

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.2129%, 2041		4,431,054		4,431,031

				1

MFS Research Bond Fund J
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Bonds – 99.0%

Advertising & Broadcasting – 0.5%

Allbritton Communications Co., 7.75%, 2012	$	650,000	$	651,625

News America Holdings, 8.5%, 2025		30,000		35,556

News America, Inc., 6.2%, 2034		489,000		477,409

			$	1,164,590

Airlines – 0.1%

Continental Airlines, Inc., 7.875%, 2018	$	331,257	$	311,001

Alcoholic Beverages – 0.3%

Miller Brewing Co., 5.5%, 2013(a)	$	734,000	$	738,477

Asset Backed & Securitized – 12.5%

Aesop Funding II LLC, 2.78%, 2007(a)	$	806,000	$	795,087

AmeriCredit Automobile Receivables Trust, 3.67%, 2009		313,078		311,611

Amresco Commercial Mortgage Funding I, 7%, 2029		142,000		143,473

ARCap, Inc., "H", 6.1%, 2045(a)		138,945		124,542

Asset Securitization Corp., 7.525%, 2029		245,761		267,698

Bank of America Commercial Mortgage, Inc., 4.857%, 2043		492,321		477,491

Bank of America Commercial Mortgage, Inc., FRN, 5.182%, 2047		657,557		654,782

Bayview Commercial Asset Trust, 0.775%, 2035(i)		7,355,004		615,417

Bayview Financial Acquisition Trust, 5.483%, 2045		307,000		306,996

Bayview Financial Acquisition Trust, FRN, 5.402%, 2045		331,000		330,690

Bear Stearns Commercial Mortgage Securities, Inc., FRN, 5.116%, 2041		401,050		396,522

Capital One Auto Finance Trust, 4.79%, 2009		61,767		61,627

Capital One Auto Finance Trust, 3.18%, 2010		607,000		596,181

Citigroup/Deutsche Bank Commercial Mortgage Trust, FRN, 5.2253%, 2020		580,000		579,980

CPS Auto Receivables Trust, 3.5%, 2009(a)		21,476		21,304

CPS Auto Receivables Trust, 3.52%, 2009(a)		58,064		57,701

CPS Auto Receivables Trust, 2.89%, 2009(a)		98,331		95,996

Credit-Based Asset Servicing and Securities, 5.303%, 2035		407,489		406,407

Crest G-Star CDO, 6.95%, 2032(a)		974,000		1,011,552

CRIIMI MAE Commercial Mortgage Trust, 7%, 2033(a)		447,087		453,382

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031		283,472		289,544

Deutsche Mortgage & Asset Receiving Corp., 7.5%, 2031		415,000		461,119

Drive Auto Receivables Trust, 2.5%, 2009(a)		586,000		573,564

E*TRADE RV & Marine Trust, 3.62%, 2018		141,000		135,176

Falcon Franchise Loan LLC, 7.382%, 2010(a)		236,479		245,051

Falcon Franchise Loan LLC, FRN, 3.0639%, 2023(a)(i)		159,646		18,591

Falcon Franchise Loan LLC, FRN, 3.7837%, 2025(i)		2,502,801		407,369

First Union National Bank Commercial Mortgage Trust, FRN, 0.9557%, 2043(a)(i)		5,933,847		235,659

First Union-Lehman Brothers Bank of America, FRN, 0.0469%, 2035(i)		6,442,394		121,708

First Union-Lehman Brothers Commercial Mortgage Trust, 7.5%, 2029		202,000		223,864

Greenwich Capital Commercial Funding Corp., FRN, 5.317%, 2036		400,000		400,950

Greenwich Capital Commercial Funding Corp., FRN, 5.224%, 2037		474,453		472,774

Greenwich Capital Commercial Funding Corp., FRN, 4.569%, 2042		400,000		386,829

Household Automotive Trust, 3.44%, 2009		226,772		224,772

IKON Receivables Funding LLC, 3.27%, 2011		506,000		499,938

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.2131%, 2041		400,000		399,998

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 4.936%, 2042		649,533		633,037

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3645%, 2043		826,928		828,722

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.038%, 2046		881,125		865,567

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4927%, 2035(i)		7,180,321		130,373

Long Beach Auto Receivables Trust, 2.841%, 2010		632,000		617,236

Morgan Stanley Capital I, Inc., 6.86%, 2010		293,000		296,940

Morgan Stanley Capital I, Inc., 7.3%, 2030(a)		500,000		516,877

				1

MFS Research Bond Fund J
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006 - continued
Insurer

AMBAC	AMBAC Indemnity Corp.
See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual
report.
	8

MFS Municipal Limited Maturity Fund
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Municipal Bonds – 98.2%

Airport & Port Revenue – 6.4%

Atlanta, GA, Airport Rev., "A", FSA, 5.375%, 2015	$	1,000,000	$	1,083,240

Chicago IL, (O'Hare International Airport), "A", MBIA, 5%, 2009		1,995,000		2,079,329

Chicago, IL (O'Hare International Airport), "A-2", FSA, 5.25%, 2013		1,500,000		1,598,205

Cleveland, OH, Airport Systems Rev., "A", FSA, 5.5%, 2008		250,000		258,455

Dallas Fort Worth, TX, International Airport, "A", AMBAC, 6%, 2013		1,000,000		1,117,880

Delaware River Port Authority Pennsylvania & New Jersey Refunding (Port District
Project), "A", FSA, 5.25%, 2009		550,000		579,518

Denver, CO, City & County Airport Rev., "C", MBIA, 6%, 2006		1,000,000		1,019,480

Houston, TX, Airport Systems Rev.,"B", FGIC, 5.25%, 2015		1,250,000		1,303,050

Long Beach, CA, Harbor Rev., "A", FGIC, 5%, 2015		1,000,000		1,058,290

Massachusetts Port Authority Rev., "A", 5.25%, 2007		375,000		383,321

Massachusetts Port Authority Rev., "A", 5.75%, 2010		175,000		190,586

Minneapolis & St. Paul, MN, Metropolitan Airport, "D", FGIC, 5.25%, 2009		500,000		522,450

New York, NY, (Industrial Development Agency Terminal One Group Assn.), 5.5%,
2014		1,000,000		1,069,330

Port Seattle, WA, Rev., "B", FGIC, 5.5%, 2007		500,000		511,255

Rhode Island Economic Development Corp. Airport Rev., "A", FGIC, 5%, 2012		750,000		793,320

Richland Lexington, SC, Columbia Metropolitan Airport Rev., "A", FSA, 5%, 2009		200,000		208,454

Wayne Charter County, MI, Airport Rev., Refunding Detroit Metropolitan, "D", FGIC,
5.25%, 2006		1,000,000		1,014,350

			$	14,790,513

General Obligations - General Purpose – 15.1%

Allen County, IN (Jail Building Corp.), ETM, 5.75%, 2009(c)	$	235,000	$	253,511

Broward County, FL, "B", 5%, 2008		500,000		515,135

Chicago, IL, Neighborhoods Alive, "A", MBIA, 5%, 2008		1,250,000		1,287,137

Chicago, IL, Park District, 5%, 2008		2,470,000		2,541,531

Columbus, OH, 5.25%, 2011		705,000		760,201

Commonwealth of Massachusetts, "A", 6%, 2010(c)		310,000		340,991

Du Page County, IL (ARS Jail Project), 5%, 2009		870,000		908,002

Hawkins County, TN, AMBAC, 4.5%, 2008		425,000		435,463

Henderson, NV, Parks & Recreation, "A", FGIC, 6%, 2006		340,000		343,040

Huntsville, AL, "D", 5%, 2008		350,000		364,070

King County, WA, "B", 4.75%, 2009		1,500,000		1,550,055

Kingsport, TN, "A", FGIC, 4%, 2008		1,000,000		1,012,100

Lansing, IL, "A", FSA, 4.25%, 2007		530,000		536,328

Milwaukee County, WI, "A", 4.75%, 2007		1,000,000		1,021,930

Missouri, Third State Building, "A", 5%, 2007		2,000,000		2,051,540

New York, NY, "A", 5.25%, 2012		265,000		285,500

New York, NY, "B", 5.75%, 2011		375,000		408,765

New York, NY, "C", 5.25%, 2009		250,000		263,430

New York, NY, "G", 5.5%, 2009		780,000		828,251

New York, NY, "J", 5%, 2010		1,000,000		1,053,130

New York, NY, "K", 5%, 2010		370,000		389,384

New York, NY, "N", 5%, 2013		1,030,000		1,101,637

Oakland, CA, "A", FGIC, 5%, 2010		820,000		869,659

Pawtucket, RI, "A", AMBAC, 5%, 2009		1,000,000		1,049,630

Philadelphia, PA, "A", XLCA, 5%, 2011		1,000,000		1,065,810

Saraland, AL, Warrants, MBIA, 4.5%, 2009		865,000		891,867

St. Clair County, IL, FGIC, 5.625%, 2012		500,000		543,010

State of California, 5%, 2011		2,250,000		2,389,657

State of California, 5%, 2012		1,150,000		1,227,809

State of California, FSA, 5.25%, 2010		2,000,000		2,137,100

State of Hawaii, "CY", FSA, 5.25%, 2008		500,000		517,690

				1

Security	Acquisition Date		Acquisition Cost		Current Market Value	Total % of Net Assets

Gallery Certificate Trust, PA, Parking Rev., FSA, 4.5%, 2013	12/17/2003	$	490,432	$	488,824	0.2	%

The following abbreviations are used throughout this report and are defined:
BMA	Bond Market Assn.
COP	Certificate of Participation
ETM	Escrowed to Maturity
Insurers

AMBAC	AMBAC Indemnity Corp.
CIFG	CDC IXIS Financial Guaranty
FGIC	Financial Guaranty Insurance Co.
FSA	Financial Security Assurance, Inc.
GNMA	Government National Mortgage Assn.
MBIA	MBIA Insurance Corp.
PSF	Permanent School Fund
Q-SBLF	Qualified School Board Loan Fund
XLCA	XL Capital Insurance Co.
See attached schedules.
For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.
		10

MFS Bond Fund
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Bonds – 97.2%

Advertising & Broadcasting – 1.7%

Chancellor Media Corp., 8%, 2008	$	5,140,000	$	5,454,876

EchoStar DBS Corp., 9.125%, 2009		4,134,000		4,325,198

News America Holdings, 7.75%, 2024		6,693,000		7,434,317

News America Holdings, 8.5%, 2025		4,931,000		5,844,300

			$	23,058,691

Airlines – 0.5%

Continental Airlines, Inc., 6.648%, 2017	$	2,517,922	$	2,496,652

Continental Airlines, Inc., 6.545%, 2019		4,395,139		4,408,542

			$	6,905,194

Asset Backed & Securitized – 11.0%

Airplane Pass-Through Trust, "D", 10.875%, 2019(r)(d)	$	1,481,550	$	0

Amresco Commercial Mortgage Funding I, 7%, 2029		4,595,000		4,642,653

ARCap REIT, Inc., "G", 6.1%, 2045(a)		2,150,000		1,949,855

Asset Securitization Corp., FRN, 8.2927%, 2029		4,095,000		4,327,592

Blackrock Capital Finance LP, 7.75%, 2026(a)		825,790		809,274

Brazilian Merchant Voucher Receivables Ltd., 5.911%, 2011(a)		4,823,568		4,817,539

Capital One Auto Finance Trust, 2.47%, 2010		4,350,000		4,273,361

Chase Commercial Mortgage Securities Corp., 6.6%, 2012		4,039,542		4,162,607

Citibank Credit Card Issuance Trust, 6.65%, 2008		3,966,000		3,983,780

Commercial Mortgage Acceptance Corp., 7.03%, 2031		5,200,000		5,464,569

Commercial Mortgage Acceptance Corp., FRN, 1.141%, 2030(i)		68,751,329		2,129,841

Commercial Mortgage Acceptance Corp., FRN, 5.44%, 2030(a)		4,362,000		4,338,886

Countrywide Asset-Backed Certificates FRN, 4.575%, 2035		699,000		688,731

CPS Auto Receivables Trust, 3.52%, 2009(a)		820,689		815,560

CRIIMI MAE Commercial Mortgage Trust, 7%, 2011(a)		4,222,893		4,282,351

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031		4,706,505		4,807,311

DLJ Commercial Mortgage Corp., 6.04%, 2031		2,675,000		2,705,414

DLJ Commercial Mortgage Corp., FRN, 7.6214%, 2032		1,390,000		1,498,735

Drive Auto Receivables Trust, 2.5%, 2009(a)		4,240,000		4,150,017

Drivetime Auto Owner Trust, FRN, 1.918%, 2008(a)		2,954,230		2,925,148

Falcon Franchise Loan LLC, 6.5%, 2014(a)		2,733,000		2,356,358

Falcon Franchise Loan LLC, FRN, 3.7884%, 2025(i)		20,061,120		3,265,252

First Union-Lehman Brothers Commercial Mortgage Trust, 7%, 2029(a)		3,028,000		3,284,350

GMAC Commercial Mortgage Securities, Inc., 6.02%, 2033		4,140,000		4,153,152

GMAC Commercial Mortgage Securities, Inc., FRN, 7.6613%, 2034(a)		3,065,000		3,320,223

Greenwich Capital Commercial Funding Corp., 4.305%, 2042		3,544,438		3,446,401

Holmes Financing PLC, FRN, 5.32%, 2040		771,000		772,157

IKON Receivables Funding LLC, 3.27%, 2011		4,670,000		4,614,049

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.345%, 2042(a)		4,734,928		4,542,100

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.3645%, 2043		7,331,619		7,347,524

J.P. Morgan Chase Commercial Mortgage Securities Corp., FRN, 5.038%, 2046		5,520,000		5,422,536

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 1.1597%, 2030(i)		43,447,967		1,125,867

Morgan Stanley Capital I, Inc., 6.86%, 2010		6,477,000		6,564,086

Morgan Stanley Capital I, Inc., 7.3%, 2030(a)		5,033,000		5,202,887

Morgan Stanley Capital I, Inc., 5.72%, 2032		6,145,781		6,248,908

Morgan Stanley Capital I, Inc., FRN, 0.731%, 2030(a)(i)		138,492,745		2,386,175

Mortgage Capital Funding, Inc., FRN, 0.7801%, 2031(i)		56,443,495		803,129

Nomura Asset Acceptance Corp., FRN, 4.423%, 2034		4,166,584		4,125,002

Prudential Securities Secured Financing Corp., FRN, 7.4486%, 2013(a)		3,468,000		3,724,567

Spirit Master Funding LLC, 5.05%, 2023(a)		3,034,358		2,945,779

TIAA Real Estate CDO Ltd., 7.17%, 2032(a)		2,317,318		2,368,479

Wachovia Bank Commercial Mortgage Trust, FRN, 4.847%, 2041		3,448,527		3,342,074

Wachovia Bank Commercial Mortgage Trust, FRN, 5.1949%, 2044		2,387,000		2,375,294

				1

	Acquisition Date	Acquisition Cost	Current Market Value	Total % of Net Assets
Restricted Security	Acquisition Date	Acquisition Cost	Current Market Value	Total % of Net Assets

Airplane Pass-Through Trust, “D”, 10.875%, 2019	3/13/96	$1,481,550	$0	0.0	%
Total Restricted Securities			$0	0.0	%

The following abbreviations are used in the Portfolio of Investments and are defined:
FRN	Floating Rate Note. The interest rate is the rate in effect as of period end.
FSA	Financial Security Assistance, Inc.
MBIA	MBIA Insurance Corp.
TIPS	Treasury Inflation Protected Security
See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual
report.
	7

MFS Limited Maturity Fund
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Bonds – 97.6%

Advertising & Broadcasting – 0.9%

Clear Channel Communications, Inc., 4.625%, 2008	$	4,060,000	$	3,999,664

Liberty Media Corp., FRN, 5.9913%, 2006		1,977,000		1,987,241

			$	5,986,905

Airlines – 0.2%

American Airlines Corp., 3.857%, 2012	$	1,141,010	$	1,095,571

Alcoholic Beverages – 0.7%

Miller Brewing Co., 4.25%, 2008(a)	$	5,325,000	$	5,213,186

Asset Backed & Securitized – 23.3%

Accredited Mortgage Loan Trust, FRN, 4.74%, 2035	$	4,995,000	$	4,996,743

Ameriquest Mortgage Securities, Inc., FRN, 4.83%, 2034		760,530		760,845

Bayview Commercial Asset Trust, FRN, 4.84%, 2035(a)		3,235,834		3,237,481

Bayview Financial Acquisition Trust, FRN, 5.483%, 2045		2,325,000		2,324,971

Brascan Real Estate, FRN, 6.201%, 2040(a)		1,526,000		1,507,383

Brazilian Merchant Voucher Receivables Ltd., 5.911%, 2011(a)		1,908,941		1,906,555

Capital One Auto Finance Trust, 4.79%, 2009		1,894,042		1,889,735

Capital One Auto Finance Trust, 2.47%, 2010		6,610,000		6,493,544

Centex Home Equity Loan Trust, FRN, 3.9%, 2024		1,215,000		1,201,043

Chalet Finance 1 PLC, FRN, 4.81%, 2013		4,800,000		4,804,939

Chase Commercial Mortgage Securities Corp., 7.37%, 2029		978,601		989,648

Circuit City Credit Card Master Trust, FRN, 4.9%, 2011		2,530,000		2,531,581

Citibank Credit Card Issuance Trust, 6.65%, 2008		3,375,000		3,390,130

Commercial Mortgage Asset Trust, FRN, 0.8874%, 2032(a)(i)		30,197,975		1,352,259

Commercial Mortgage Pass-Through Certificate, FRN, 4.66%, 2017(a)		3,400,000		3,399,497

Continental Airlines, Inc., FRN, 4.79%, 2013		1,609,875		1,614,084

Countrywide Asset-Backed Certificates, FRN, 4.575%, 2035		2,266,000		2,232,710

CPS Auto Receivables Trust, 3.5%, 2009(a)		208,544		206,882

CPS Auto Receivables Trust, 3.52%, 2009(a)		147,703		146,780

CPS Auto Receivables Trust, 2.89%, 2009(a)		596,313		582,151

Credit-Based Asset Servicing and Securities, FRN, 5.303%, 2035		4,216,085		4,204,887

Deutsche Mortgage & Asset Receiving Corp., 6.538%, 2031		3,491,109		3,565,883

Drive Auto Receivables Trust, 2.77%, 2008(a)		2,880,345		2,876,409

Drivetime Auto Owner Trust, FRN, 1.918%, 2008(a)		2,085,852		2,065,319

E*TRADE RV & Marine Trust, 3.62%, 2018		3,411,000		3,270,120

Falcon Franchise Loan LLC, 7.382%, 2010(a)		1,028,131		1,065,400

First Auto Receivables Group Trust, 2.436%, 2007(a)		846,699		844,046

Gramercy Real Estate CDO Ltd., FRN, 4.9423%, 2035		2,177,207		2,179,166

Holmes Financing PLC, FRN, 5.32%, 2040		2,600,000		2,603,900

Household Automotive Trust, 3.44%, 2009		3,293,062		3,264,015

IKON Receivables Funding LLC, 2.33%, 2007		153,857		153,492

IKON Receivables Funding LLC, 3.27%, 2011		500,000		494,010

IMPAC CMB Trust, FRN, 5.17%, 2033		964,705		965,064

IMPAC CMB Trust, FRN, 4.9%, 2034		2,133,926		2,137,029

IMPAC CMB Trust, FRN, 4.99%, 2034		2,246,238		2,251,383

Interstar Millennium Trust, FRN, 4.6888%, 2036		2,670,250		2,675,626

J.P. Morgan Chase Commercial Mortgage Securities Corp., 4.851%, 2042		3,504,086		3,457,315

J.P. Morgan Commercial Mortgage Finance Corp., 7.325%, 2031		72,397		72,471

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 6.48%, 2030		3,172,191		3,233,841

Lehman Brothers Commercial Conduit Mortgage Trust, FRN, 0.4943%, 2035(i)		68,125,039		1,236,946

Long Beach Auto Receivables Trust, FRN, 2.841%, 2010		3,367,000		3,288,345

Medallion Trust, FRN, 4.7985%, 2031		307,060		306,704

Merrill Lynch Mortgage Investors, Inc., FRN, 7.0762%, 2030		2,180,000		2,244,807

Morgan Stanley ABS Capital I, FRN, 4.74%, 2035		2,950,133		2,952,426

				1

(k)	As of January 31, 2006, the fund had one security representing $2,572,881 and 0.4% of net assets that was fair valued in
	accordance with the policies adopted by the Board of Trustees.
(t)	Security exempt from registration with the U.S. Securities and Exchange Commission under Section 4(2) of the Securities
	Act of 1933.
(f)	All or a portion of the security has been segregated as collateral for an open futures contract.
(a)	SEC Rule 144A restriction.
(y)	The rate shown represents an annualized yield at time of purchase.
(i)	Interest only security for which the fund receives interest on notional principal (Par amount). Par amount shown is the
	notional principal and does not reflect the cost of the security.
The following abbreviation is used in the Portfolio of Investments and is defined:
FRN	Floating Rate Note. The interest rate is the rate in effect as of period end.
See attached schedules. For more information see notes to financial statements as disclosed in the most recent semiannual or annual
report.
	6

MFS Inflation-Adjusted Bond Fund
PORTFOLIO OF INVESTMENTS (Unaudited) 01/31/2006
Issuer		Shares/Par		Value ($)

Bonds – 95.5%

U.S. Government Agencies – 1.6%

Small Business Administration, 4.76%, 2025	$	93,000	$	90,739

Small Business Administration, 5.09%, 2025		78,000		77,669

Small Business Administration, 5.36%, 2025		100,000		101,052

Small Business Administration, 5.21%, 2026		90,000		90,188

			$	359,648

U.S. Treasury Inflation Protected Obligations – 93.9%

U.S. Treasury Bonds, 2.375%, 2025	$	1,816,123	$	1,919,486

U.S. Treasury Bonds, 2%, 2026		1,125,299		1,123,268

U.S. Treasury Bonds, 3.625%, 2028		1,093,717		1,415,628

U.S. Treasury Bonds, 3.875%, 2029		1,209,524		1,636,372

U.S. Treasury Bonds, 3.375%, 2032		420,914		549,393

U.S. Treasury Notes, 3.625%, 2008		1,262,580		1,305,685

U.S. Treasury Notes, 3.875%, 2009		1,025,617		1,084,910

U.S. Treasury Notes, 0.875%, 2010		1,323,011		1,267,971

U.S. Treasury Notes, 3.5%, 2011		1,472,912		1,584,531

U.S. Treasury Notes, 3%, 2012		1,580,779		1,683,221

U.S. Treasury Notes, 1.875%, 2013		1,748,760		1,738,582

U.S. Treasury Notes, 2%, 2014		3,077,498		3,081,705

U.S. Treasury Notes, 1.625%, 2015		1,122,070		1,088,408

U.S. Treasury Notes, 1.875%, 2015		912,503		903,556

U.S. Treasury Notes, 2%, 2016		629,371		629,936

			$	21,012,652

Total Bonds			$	21,372,300

Short-Term Obligation – 3.2%

Alpine Securitization Corp., 4.48%, due 2/01/06(t)	$	717,000	$	717,000

Total Investments			$	22,089,300

Other Assets, Less Liabilities – 1.3%				281,664

Net Assets – 100.0%			$	22,370,964

Notice
A copy of the Amended and Restated Declaration of Trust 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 IX
By (Signature and Title)*	MARIA F. DWYER
	Maria F. Dwyer, President
Date: March 24, 2006
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: March 24, 2006
By (Signature and Title)*	TRACY ATKINSON
	Tracy Atkinson, Treasurer (Principal Financial Officer and
	Accounting Officer)
Date: March 24, 2006
* Print name and title of each signing officer under his or her signature.