Quarterly Report
November 30, 2024
MFS® Government
Securities Fund
Securities Fund
MFG-Q3
Portfolio of Investments
11/30/24 (unaudited)
The Portfolio of Investments is a complete list of all securities owned by your fund. It is categorized by broad-based asset classes.
| Issuer | Shares/Par | Value ($) | ||
| Bonds – 94.4% | ||||
| Asset-Backed & Securitized – 8.0% | ||||
| 3650R Commercial Mortgage Trust, 2021-PF1, “XA”, 1.119%, 11/15/2054 (i) | $ | 21,636,500 | $923,338 | |
| ACREC 2021-FL1 Ltd., “AS”, FLR, 6.224% ((SOFR - 1mo. + 0.11448%) + 1.5%), 10/16/2036 (n) | 7,778,000 | 7,733,258 | ||
| ACREC 2023-FL2 LLC, “A”, FLR, 6.839% (SOFR - 1mo. + 2.23%), 2/19/2038 (n) | 4,821,635 | 4,817,982 | ||
| American Credit Acceptance Receivables Trust, 2024-2, “A”, 5.9%, 2/12/2027 (n) | 2,305,057 | 2,313,608 | ||
| AmeriCredit Automobile Receivables Trust, 2024-1, “A”, 5.61%, 1/12/2027 (n) | 842,874 | 843,728 | ||
| AmeriCredit Automobile Receivables Trust, 2024-1, “A2-B”, FLR, 5.389% (SOFR - 1mo. + 0.6%), 2/18/2028 | 6,797,375 | 6,800,844 | ||
| Arbor Realty Trust, Inc., CLO, 2021-FL1, “A”, FLR, 5.694% ((SOFR - 1mo. + 0.11448%) + 0.97%), 12/15/2035 (n) | 1,380,227 | 1,374,788 | ||
| Arbor Realty Trust, Inc., CLO, 2021-FL1, “B”, FLR, 6.223% ((SOFR - 1mo. + 0.11448%) + 1.5%), 12/15/2035 (n) | 3,901,000 | 3,870,307 | ||
| Arbor Realty Trust, Inc., CLO, 2021-FL3, “AS”, FLR, 6.124% ((SOFR - 1mo. + 0.11448%) + 1.4%), 8/15/2034 (n) | 6,638,000 | 6,602,958 | ||
| AREIT 2022-CRE6 Trust, “AS”, FLR, 6.41% (SOFR - 30 day + 1.65%), 1/20/2037 (n) | 7,155,500 | 7,109,163 | ||
| ARI Fleet Lease Trust, 2023-B, “A2”, 6.05%, 7/15/2032 (n) | 1,525,453 | 1,540,913 | ||
| BBCMS Mortgage Trust, 2021-C10, “XA”, 1.337%, 7/15/2054 (i) | 20,055,762 | 1,168,338 | ||
| BBCMS Mortgage Trust, 2021-C9, “XA”, 1.714%, 2/15/2054 (i) | 13,581,247 | 1,007,363 | ||
| BBCMS Mortgage Trust, 2022-C18, “XA”, 0.639%, 12/15/2055 (i) | 22,976,233 | 812,722 | ||
| BDS Ltd., 2024-FL13, “A”, FLR, 6.186% (SOFR - 1mo. + 1.5762%), 9/19/2039 (n) | 1,558,000 | 1,557,791 | ||
| Benchmark 2021-B23 Mortgage Trust, “XA”, 1.367%, 2/15/2054 (i) | 43,450,425 | 2,321,378 | ||
| Benchmark 2021-B24 Mortgage Trust, “XA”, 1.258%, 3/15/2054 (i) | 26,190,589 | 1,235,525 | ||
| Benchmark 2021-B26 Mortgage Trust, “XA”, 0.995%, 6/15/2054 (i) | 38,088,069 | 1,469,331 | ||
| Benchmark 2021-B27 Mortgage Trust, “XA”, 1.368%, 7/15/2054 (i) | 33,377,565 | 1,886,774 | ||
| Benchmark 2021-B28 Mortgage Trust, “XA”, 1.375%, 8/15/2054 (i) | 39,748,231 | 2,341,691 | ||
| Benchmark 2021-B29 Mortgage Trust, “XA”, 1.134%, 9/15/2054 (i) | 44,977,141 | 1,988,759 | ||
| Bridgecrest Lending Auto Securitization Trust, 2024-2, “A2”, 5.78%, 2/16/2027 | 3,353,727 | 3,361,183 | ||
| BSPDF 2021-FL1 Issuer Ltd., “A”, FLR, 5.924% ((SOFR - 1mo. + 0.11448%) + 1.2%), 10/15/2036 (n) | 948,450 | 938,837 | ||
| BSPDF 2021-FL1 Issuer Ltd., “AS”, FLR, 6.203% ((SOFR - 1mo. + 0.11448%) + 1.48%), 10/15/2036 (n) | 4,700,500 | 4,611,670 | ||
| Business Jet Securities LLC, 2024-1A, “A”, 6.197%, 5/15/2039 (n) | 1,413,416 | 1,435,734 | ||
| BXMT 2021-FL4 Ltd., “AS”, FLR, 6.024% ((SOFR - 1mo. + 0.11448%) + 1.3%), 5/15/2038 (n) | 7,779,500 | 7,339,684 | ||
| Chesapeake Funding II LLC, 2023-2A, “A2”, FLR, 5.905% (SOFR - 30 day + 1.1%), 10/15/2035 (n) | 2,740,205 | 2,756,099 | ||
| Citigroup Commercial Mortgage Trust, 2019-XA, “C7”, 0.972%, 12/15/2072 (i)(n) | 22,609,896 | 757,235 | ||
| Commercial Mortgage Pass-Through Certificates, 2021-BN31, “XA”, 1.394%, 2/15/2054 (i) | 32,827,318 | 1,997,972 | ||
| Commercial Mortgage Pass-Through Certificates, 2021-BN32, “XA”, 0.876%, 4/15/2054 (i) | 18,913,478 | 646,605 | ||
| Commercial Mortgage Pass-Through Certificates, 2021-BN35, “XA”, 1.139%, 6/15/2064 (i) | 13,212,438 | 645,301 | ||
| Commercial Mortgage Pass-Through Certificates, 2024-CBM, “A2”, 5.867%, 12/10/2041 (n) | 1,395,974 | 1,426,212 | ||
| Dell Equipment Finance Trust, 2023-3, “A2”, 6.1%, 4/23/2029 (n) | 1,505,387 | 1,510,959 | ||
| DT Auto Owner Trust, 2023-1A, “A”, 5.48%, 4/15/2027 (n) | 100,952 | 100,974 | ||
| DT Auto Owner Trust, 2023-2A, “A”, 5.88%, 4/15/2027 (n) | 871,814 | 872,817 | ||
| EQT Trust, 2024-EXTR, “B”, 5.654%, 7/05/2041 (n) | 1,503,054 | 1,514,812 | ||
| GLS Auto Select Receivables Trust, 2023-2A, 6.37%, 6/15/2028 (n) | 1,931,311 | 1,954,077 | ||
| GLS Auto Select Receivables Trust, 2024-2A, “A-2”, 5.77%, 6/15/2027 (n) | 4,686,659 | 4,702,587 | ||
| KREF 2018-FT1 Ltd., “AS”, FLR, 6.025% ((SOFR - 1mo. + 0.11448%) + 1.3%), 2/15/2039 (n) | 759,000 | 744,993 | ||
| LAD Auto Receivables Trust, 2022-1A, “A”, 5.21%, 6/15/2027 (n) | 289,533 | 289,869 | ||
| LAD Auto Receivables Trust, 2023-1A, “A2”, 5.68%, 10/15/2026 (n) | 144,490 | 144,578 | ||
| LoanCore 2021-CRE5 Ltd., “AS”, FLR, 6.474% ((SOFR - 1mo. + 0.11448%) + 1.75%), 7/15/2036 (n) | 6,508,500 | 6,475,129 | ||
| LoanCore 2021-CRE6 Ltd., “AS”, FLR, 6.374% ((SOFR - 1mo. + 0.11448%) + 1.65%), 11/15/2038 (n) | 10,000,000 | 9,856,890 | ||
| MF1 2021-FL5 Ltd., “AS”, FLR, 5.923% ((SOFR - 1mo. + 0.11448%) + 1.2%), 7/15/2036 (n) | 3,875,500 | 3,858,177 | ||
| MF1 2021-FL5 Ltd., “B”, FLR, 6.174% ((SOFR - 1mo. + 0.11448%) + 1.45%), 7/15/2036 (n) | 4,881,500 | 4,852,354 | ||
| Morgan Stanley Capital I Trust, 2018-H4, “XA”, 0.973%, 12/15/2051 (i) | 22,218,523 | 601,915 | ||
| Morgan Stanley Capital I Trust, 2021-L5, “XA”, 1.406%, 5/15/2054 (i) | 16,667,750 | 920,945 | ||
| Morgan Stanley Capital I Trust, 2021-L6, “XA”, 1.289%, 6/15/2054 (i) | 19,837,236 | 960,580 | ||
| Morgan Stanley Capital I Trust, 2021-L7, “XA”, 1.2%, 10/15/2054 (i) | 79,980,183 | 3,819,158 | ||
| Morgan Stanley Residential Mortgage Loan Trust, 2024-NQM1, “A-1”, 6.152%, 12/25/2068 (n) | 5,442,128 | 5,483,945 | ||
| Morgan Stanley Residential Mortgage Loan Trust, 2024-NQM3, “A-1”, 5.044%, 7/25/2069 (n) | 2,134,076 | 2,120,888 | ||
| Navistar Financial Dealer Note Master Owner Trust, 2023-1, “A”, 6.18%, 8/25/2028 (n) | 1,299,000 | 1,311,777 | ||
| Navistar Financial Dealer Note Master Owner Trust, 2023-1, “B”, 6.48%, 8/25/2028 (n) | 1,379,000 | 1,392,019 | ||
| OBX Trust, 2024-NQM1, “A1”, 5.928%, 11/25/2063 (n) | 1,947,125 | 1,958,326 | ||
| OBX Trust, 2024-NQM1, “A2”, 6.253%, 11/25/2063 (n) | 588,273 | 591,128 | ||
| PFS Financing Corp., 2023-C, “B”, 5.91%, 10/15/2028 (n) | 1,302,000 | 1,317,786 | ||
1
Portfolio of Investments (unaudited) – continued
| Issuer | Shares/Par | Value ($) | ||
| Bonds – continued | ||||
| Asset-Backed & Securitized – continued | ||||
| Provident Funding Mortgage Trust, 2024-1, “A3”, 5.5%, 12/25/2054 (n) | $ | 3,173,618 | $3,163,547 | |
| ReadyCap Commercial Mortgage Trust, 2021-FL7, “A”, FLR, 5.902% ((SOFR - 1mo. + 0.11448%) + 1.2%), 11/25/2036 (n) | 1,772,737 | 1,766,030 | ||
| ReadyCap Commercial Mortgage Trust, 2021-FL7, “AS”, FLR, 6.202% ((SOFR - 1mo. + 0.11448%) + 1.5%), 11/25/2036 (n) | 1,261,500 | 1,262,478 | ||
| Santander Drive Auto Receivables Trust, 2024-1, “A2”, 5.71%, 2/16/2027 | 892,549 | 894,247 | ||
| SBNA Auto Lease Trust, 2024-A, “A2”, 5.45%, 1/20/2026 (n) | 1,605,818 | 1,608,676 | ||
| Verus Securitization Trust, 2014-1, “A1”, 5.712%, 1/25/2069 (n) | 5,193,374 | 5,202,187 | ||
| Verus Securitization Trust, 2024-1, “A2”, 5.915%, 1/25/2069 (n) | 1,451,961 | 1,452,168 | ||
| Verus Securitization Trust, 2024-4, “A1”, 6.218%, 6/25/2069 (n) | 2,758,525 | 2,783,788 | ||
| Wells Fargo Commercial Mortgage Trust, 2018-C48, “XA”, 1.102%, 1/15/2052 (i)(n) | 12,319,495 | 374,486 | ||
| Wells Fargo Commercial Mortgage Trust, 2021-C60, “XA”, 1.621%, 8/15/2054 (i) | 20,295,831 | 1,448,410 | ||
| Westlake Automobile Receivables Trust, 2024-1A, “A2B”, FLR, 5.368% (SOFR - 1mo. + 0.57%), 3/15/2027 (n) | 3,568,574 | 3,571,556 | ||
| World Omni Select Auto Trust, 2023-A, “A2B”, FLR, 5.648% (SOFR - 30 day + 0.85%), 3/15/2027 | 1,273,081 | 1,274,148 | ||
| $167,795,495 | ||||
| Consumer Services – 0.1% | ||||
| Conservation Fund, 3.474%, 12/15/2029 | $ | 2,018,000 | $1,851,026 | |
| Industrial – 0.0% | ||||
| Howard University, Washington D.C., 2.516%, 10/01/2025 | $ | 688,000 | $671,105 | |
| Medical & Health Technology & Services – 0.1% | ||||
| ProMedica Toledo Hospital, “B”, 5.75%, 11/15/2038 | $ | 1,992,000 | $2,006,615 | |
| Mortgage-Backed – 56.1% | ||||
| Fannie Mae, 4.5%, 5/01/2025 - 6/01/2044 | $ | 15,402,074 | $15,224,625 | |
| Fannie Mae, 3%, 11/01/2028 - 9/01/2046 | 41,222,427 | 39,086,902 | ||
| Fannie Mae, 3.5%, 1/25/2030 - 6/25/2048 | 30,204,383 | 27,918,044 | ||
| Fannie Mae, 2.5%, 11/01/2031 - 10/01/2046 | 4,676,473 | 4,309,905 | ||
| Fannie Mae, 3.5%, 12/25/2031 - 2/25/2036 (i) | 954,519 | 75,802 | ||
| Fannie Mae, 6.5%, 1/01/2032 - 10/01/2037 | 513,554 | 533,176 | ||
| Fannie Mae, 6%, 1/01/2033 - 12/01/2037 | 1,305,446 | 1,341,754 | ||
| Fannie Mae, 3%, 2/25/2033 - 1/25/2052 (i) | 1,617,690 | 160,703 | ||
| Fannie Mae, 5.5%, 5/01/2033 - 5/01/2044 | 6,258,212 | 6,386,029 | ||
| Fannie Mae, 5%, 11/01/2033 - 3/25/2042 | 7,304,220 | 7,390,158 | ||
| Fannie Mae, 5.299%, 4/25/2034 | 245,873 | 245,729 | ||
| Fannie Mae, 5.139%, 1/25/2036 | 158,321 | 158,181 | ||
| Fannie Mae, 5.149%, 10/25/2039 - 12/25/2045 | 2,917,793 | 2,865,471 | ||
| Fannie Mae, 4%, 9/01/2040 - 7/01/2047 | 29,867,995 | 28,662,973 | ||
| Fannie Mae, 1%, 3/25/2041 | 1,585,627 | 1,370,716 | ||
| Fannie Mae, 5.199%, 3/25/2041 | 447,118 | 445,503 | ||
| Fannie Mae, 2.25%, 4/25/2041 | 1,590,149 | 1,500,868 | ||
| Fannie Mae, 5.349%, 7/25/2041 - 12/25/2049 | 2,314,647 | 2,276,888 | ||
| Fannie Mae, 1.75%, 9/25/2041 | 1,203,596 | 1,138,466 | ||
| Fannie Mae, 2.75%, 9/25/2042 | 1,071,198 | 1,020,361 | ||
| Fannie Mae, 2%, 5/25/2044 - 4/25/2046 | 2,158,465 | 1,983,265 | ||
| Fannie Mae, UMBS, 2%, 4/01/2036 - 5/01/2052 | 70,315,549 | 57,653,155 | ||
| Fannie Mae, UMBS, 2.5%, 5/01/2036 - 8/01/2052 | 123,143,397 | 104,654,010 | ||
| Fannie Mae, UMBS, 5.5%, 10/01/2038 - 8/01/2054 | 26,853,764 | 26,863,319 | ||
| Fannie Mae, UMBS, 1.5%, 2/01/2042 - 3/01/2051 | 1,434,418 | 1,119,579 | ||
| Fannie Mae, UMBS, 3.5%, 5/01/2049 - 9/01/2052 | 2,176,259 | 2,000,045 | ||
| Fannie Mae, UMBS, 3%, 6/01/2051 - 8/01/2052 | 33,730,185 | 29,592,314 | ||
| Fannie Mae, UMBS, 4%, 8/01/2051 - 3/01/2053 | 6,740,714 | 6,367,160 | ||
| Fannie Mae, UMBS, 4.5%, 9/01/2052 | 1,878,100 | 1,818,641 | ||
| Fannie Mae, UMBS, 5%, 9/01/2052 - 7/01/2054 | 386,208 | 379,620 | ||
| Fannie Mae, UMBS, 6%, 2/01/2053 - 10/01/2054 | 19,322,686 | 19,602,831 | ||
| Fannie Mae, UMBS, 6.5%, 1/01/2054 | 1,156,575 | 1,184,244 | ||
| Freddie Mac, 2.67%, 12/25/2024 | 1,281,200 | 1,276,940 | ||
| Freddie Mac, 3.062%, 12/25/2024 | 115,287 | 114,906 | ||
| Freddie Mac, 2.811%, 1/25/2025 | 5,364,161 | 5,341,253 | ||
2
Portfolio of Investments (unaudited) – continued
| Issuer | Shares/Par | Value ($) | ||
| Bonds – continued | ||||
| Mortgage-Backed – continued | ||||
| Freddie Mac, 0.178%, 5/25/2025 (i) | $ | 587,585,677 | $219,880 | |
| Freddie Mac, 3.7%, 5/25/2025 | 3,220,004 | 3,200,580 | ||
| Freddie Mac, 4%, 7/01/2025 - 1/15/2055 | 6,323,717 | 6,156,068 | ||
| Freddie Mac, 4.5%, 7/01/2025 - 5/01/2042 | 4,781,649 | 4,742,466 | ||
| Freddie Mac, 3.75%, 8/25/2025 | 1,893,746 | 1,878,439 | ||
| Freddie Mac, 3.5%, 11/15/2025 - 10/25/2058 | 30,195,378 | 28,526,381 | ||
| Freddie Mac, 3.208%, 2/25/2026 | 2,053,826 | 2,024,553 | ||
| Freddie Mac, 2.57%, 7/25/2026 | 31,475,000 | 30,581,699 | ||
| Freddie Mac, 3.12%, 9/25/2026 | 12,661,384 | 12,358,445 | ||
| Freddie Mac, 2.525%, 10/25/2026 | 10,822,583 | 10,450,532 | ||
| Freddie Mac, 2.797%, 12/25/2026 | 2,389,817 | 2,341,220 | ||
| Freddie Mac, 3.413%, 12/25/2026 | 16,700,000 | 16,355,257 | ||
| Freddie Mac, 1.479%, 3/25/2027 - 6/25/2030 (i) | 35,084,503 | 1,949,828 | ||
| Freddie Mac, 3.243%, 4/25/2027 | 10,090,226 | 9,811,174 | ||
| Freddie Mac, 3.117%, 6/25/2027 | 15,075,000 | 14,596,614 | ||
| Freddie Mac, 0.699%, 7/25/2027 (i) | 100,912,051 | 1,261,088 | ||
| Freddie Mac, 0.544%, 8/25/2027 (i) | 78,492,807 | 777,746 | ||
| Freddie Mac, 1.47%, 9/25/2027 | 4,600,000 | 4,241,188 | ||
| Freddie Mac, 0.489%, 12/25/2027 (i) | 1,359,637 | 13,867 | ||
| Freddie Mac, 0.43%, 1/25/2028 (i) | 139,275,286 | 1,211,737 | ||
| Freddie Mac, 0.432%, 1/25/2028 (i) | 58,281,445 | 514,106 | ||
| Freddie Mac, 0.265%, 2/25/2028 (i) | 168,070,882 | 727,747 | ||
| Freddie Mac, 0.26%, 4/25/2028 (i) | 110,405,132 | 488,443 | ||
| Freddie Mac, 3.9%, 4/25/2028 | 1,867,674 | 1,834,304 | ||
| Freddie Mac, 3%, 6/15/2028 - 2/25/2059 | 25,747,904 | 23,819,627 | ||
| Freddie Mac, 0.612%, 10/25/2028 (i) | 39,463,167 | 633,857 | ||
| Freddie Mac, 5.329%, 3/25/2029 | 5,243,526 | 5,235,144 | ||
| Freddie Mac, 0.63%, 5/25/2029 (i) | 58,862,053 | 1,112,640 | ||
| Freddie Mac, 1.005%, 7/25/2029 (i) | 31,354,116 | 1,102,966 | ||
| Freddie Mac, 1.217%, 7/25/2029 (i) | 19,135,470 | 808,422 | ||
| Freddie Mac, 1.263%, 8/25/2029 (i) | 33,375,285 | 1,489,589 | ||
| Freddie Mac, 5.333%, 12/25/2029 | 3,012,500 | 3,010,434 | ||
| Freddie Mac, 1.439%, 1/25/2030 (i) | 26,595,348 | 1,501,736 | ||
| Freddie Mac, 1.706%, 1/25/2030 (i) | 19,453,242 | 1,307,412 | ||
| Freddie Mac, 1.915%, 4/25/2030 (i) | 14,430,646 | 1,197,529 | ||
| Freddie Mac, 1.984%, 4/25/2030 (i) | 20,077,463 | 1,728,770 | ||
| Freddie Mac, 1.769%, 5/25/2030 (i) | 12,033,779 | 954,080 | ||
| Freddie Mac, 1.906%, 5/25/2030 (i) | 26,880,424 | 2,271,726 | ||
| Freddie Mac, 5.5%, 6/01/2030 - 9/01/2041 | 2,684,900 | 2,737,854 | ||
| Freddie Mac, 1.209%, 6/25/2030 (i) | 19,957,684 | 1,009,290 | ||
| Freddie Mac, 1.435%, 6/25/2030 (i) | 11,124,134 | 709,996 | ||
| Freddie Mac, 5.229%, 6/25/2030 | 2,694,845 | 2,688,405 | ||
| Freddie Mac, 5.269%, 6/25/2030 | 1,824,555 | 1,820,248 | ||
| Freddie Mac, 1.703%, 8/25/2030 (i) | 10,235,210 | 795,094 | ||
| Freddie Mac, 1.262%, 9/25/2030 (i) | 6,568,138 | 382,654 | ||
| Freddie Mac, 1.171%, 11/25/2030 (i) | 13,158,725 | 730,011 | ||
| Freddie Mac, 5.404%, 11/25/2030 | 6,739,963 | 6,739,947 | ||
| Freddie Mac, 0.416%, 1/25/2031 (i) | 49,935,068 | 773,040 | ||
| Freddie Mac, 0.627%, 1/25/2031 (i) | 70,182,335 | 2,030,635 | ||
| Freddie Mac, 0.872%, 1/25/2031 (i) | 19,512,958 | 812,816 | ||
| Freddie Mac, 1.026%, 1/25/2031 (i) | 14,681,587 | 720,274 | ||
| Freddie Mac, 0.546%, 2/25/2031 (i) | 18,431,877 | 429,824 | ||
| Freddie Mac, 0.609%, 3/25/2031 (i) | 40,116,045 | 1,032,290 | ||
| Freddie Mac, 0.828%, 3/25/2031 (i) | 17,260,719 | 692,072 | ||
| Freddie Mac, 1.324%, 5/25/2031 (i) | 7,120,528 | 471,383 | ||
| Freddie Mac, 1.039%, 7/25/2031 (i) | 11,674,001 | 626,541 | ||
| Freddie Mac, 1.321%, 7/25/2031 (i) | 22,560,568 | 1,553,345 | ||
| Freddie Mac, 0.607%, 8/25/2031 (i) | 14,886,036 | 417,882 | ||
| Freddie Mac, 0.632%, 9/25/2031 (i) | 50,814,178 | 1,543,633 | ||
3
Portfolio of Investments (unaudited) – continued
| Issuer | Shares/Par | Value ($) | ||
| Bonds – continued | ||||
| Mortgage-Backed – continued | ||||
| Freddie Mac, 0.955%, 9/25/2031 (i) | $ | 48,419,608 | $2,293,956 | |
| Freddie Mac, 0.441%, 11/25/2031 (i) | 73,361,326 | 1,553,954 | ||
| Freddie Mac, 0.596%, 12/25/2031 (i) | 73,957,916 | 2,158,809 | ||
| Freddie Mac, 0.665%, 12/25/2031 (i) | 12,187,459 | 401,706 | ||
| Freddie Mac, 0.87%, 2/25/2032 (i) | 49,680,895 | 2,309,387 | ||
| Freddie Mac, 5.37%, 11/15/2032 | 41,009 | 40,756 | ||
| Freddie Mac, 0.301%, 11/25/2032 (i) | 74,026,378 | 1,017,167 | ||
| Freddie Mac, 0.431%, 5/25/2033 (i) | 64,115,960 | 1,422,118 | ||
| Freddie Mac, 0.299%, 8/25/2033 (i) | 78,666,400 | 1,039,372 | ||
| Freddie Mac, 0.362%, 10/25/2033 (i) | 75,772,703 | 1,327,985 | ||
| Freddie Mac, 5.15%, 12/25/2033 | 5,750,979 | 5,977,161 | ||
| Freddie Mac, 5%, 3/25/2034 - 12/01/2044 | 23,014,091 | 23,546,696 | ||
| Freddie Mac, 6%, 8/01/2034 - 10/01/2038 | 2,588,701 | 2,693,350 | ||
| Freddie Mac, 0.905%, 9/25/2034 (i) | 9,883,118 | 717,599 | ||
| Freddie Mac, 4.489%, 9/25/2034 | 15,933,680 | 15,783,696 | ||
| Freddie Mac, 5.5%, 2/15/2036 (i) | 286,239 | 47,473 | ||
| Freddie Mac, 6.5%, 5/01/2037 | 83,056 | 85,525 | ||
| Freddie Mac, 4.5%, 12/15/2040 (i) | 52,685 | 4,915 | ||
| Freddie Mac, 1.75%, 8/15/2041 | 897,190 | 838,521 | ||
| Freddie Mac, 5.32%, 8/15/2046 | 369,864 | 364,204 | ||
| Freddie Mac, 6.184%, 10/25/2053 | 656,588 | 665,139 | ||
| Freddie Mac, 0.434%, 6/25/2055 (i) | 116,203,070 | 2,536,457 | ||
| Freddie Mac, 3.25%, 11/25/2061 | 4,558,861 | 4,179,018 | ||
| Freddie Mac, UMBS, 2.5%, 3/01/2037 - 9/01/2052 | 30,574,350 | 25,784,133 | ||
| Freddie Mac, UMBS, 2%, 4/01/2037 - 3/01/2052 | 41,381,481 | 33,564,475 | ||
| Freddie Mac, UMBS, 3.5%, 12/01/2046 - 8/01/2052 | 4,348,332 | 3,978,592 | ||
| Freddie Mac, UMBS, 3%, 2/01/2050 - 8/01/2052 | 30,448,155 | 26,623,476 | ||
| Freddie Mac, UMBS, 1.5%, 4/01/2051 - 11/01/2051 | 9,668,108 | 7,384,597 | ||
| Freddie Mac, UMBS, 4%, 5/01/2052 | 4,152,634 | 3,914,165 | ||
| Freddie Mac, UMBS, 5%, 11/01/2052 - 8/01/2054 | 5,642,555 | 5,549,905 | ||
| Freddie Mac, UMBS, 5.5%, 12/01/2052 - 8/01/2054 | 17,635,445 | 17,647,106 | ||
| Freddie Mac, UMBS, 6%, 2/01/2053 - 5/01/2054 | 11,886,320 | 12,038,500 | ||
| Freddie Mac, UMBS, 6.5%, 12/01/2053 - 5/01/2054 | 8,609,755 | 8,822,316 | ||
| Ginnie Mae, 5.5%, 3/15/2033 - 7/20/2054 | 29,339,022 | 29,444,852 | ||
| Ginnie Mae, 4.5%, 7/20/2033 - 5/20/2054 | 36,992,040 | 35,988,622 | ||
| Ginnie Mae, 5.659%, 8/20/2034 | 850,175 | 864,028 | ||
| Ginnie Mae, 4%, 5/16/2039 - 9/20/2054 | 11,267,422 | 10,648,912 | ||
| Ginnie Mae, 5%, 8/20/2039 - 4/20/2053 | 6,151,981 | 6,091,213 | ||
| Ginnie Mae, 4%, 12/20/2039 - 8/16/2042 (i) | 1,072,284 | 161,314 | ||
| Ginnie Mae, 4.821%, 9/20/2041 | 8,621,740 | 8,373,491 | ||
| Ginnie Mae, 3.5%, 10/20/2041 - 1/20/2043 (i) | 4,162,259 | 614,123 | ||
| Ginnie Mae, 3.5%, 12/15/2041 - 6/20/2052 | 18,872,230 | 17,395,435 | ||
| Ginnie Mae, 2.5%, 6/20/2042 - 5/20/2052 | 23,465,663 | 20,049,344 | ||
| Ginnie Mae, 3%, 2/20/2043 - 10/20/2052 | 28,858,488 | 25,709,861 | ||
| Ginnie Mae, 2.25%, 9/20/2043 | 341,516 | 335,017 | ||
| Ginnie Mae, 5.021%, 10/20/2045 | 7,654,449 | 7,427,038 | ||
| Ginnie Mae, 5.171%, 7/20/2046 | 3,007,318 | 2,948,955 | ||
| Ginnie Mae, 2%, 11/20/2050 (i) | 198,648 | 22,952 | ||
| Ginnie Mae, 2.5%, 2/20/2051 (i) | 2,350,852 | 290,561 | ||
| Ginnie Mae, 2%, 1/20/2052 - 11/20/2052 | 36,802,996 | 30,265,757 | ||
| Ginnie Mae, 6%, 11/20/2053 - 11/20/2055 | 24,542,888 | 24,850,042 | ||
| Ginnie Mae, 7%, 12/20/2053 | 499,220 | 513,271 | ||
| Ginnie Mae, 5.911%, 3/20/2064 | 7,059,306 | 7,089,045 | ||
| Ginnie Mae, TBA, 5%, 12/15/2054 | 24,775,000 | 24,415,069 | ||
| Ginnie Mae, TBA, 6%, 12/15/2054 | 10,075,000 | 10,176,152 | ||
| Ginnie Mae, TBA, 7%, 12/15/2054 | 25,000 | 25,638 | ||
| UMBS, TBA, 2%, 12/25/2039 - 12/25/2054 | 41,026,092 | 32,954,889 | ||
| UMBS, TBA, 2.5%, 12/25/2054 | 1,275,000 | 1,066,880 | ||
4
Portfolio of Investments (unaudited) – continued
| Issuer | Shares/Par | Value ($) | ||
| Bonds – continued | ||||
| Mortgage-Backed – continued | ||||
| UMBS, TBA, 5%, 12/25/2054 | $ | 27,275,000 | $26,761,934 | |
| $1,174,014,688 | ||||
| Municipals – 0.5% | ||||
| Chicago, IL, Transit Authority Sales Tax Receipts Refunding Rev., Taxable, “B”, 2.064%, 12/01/2024 | $ | 985,000 | $985,000 | |
| Golden State, CA, Tobacco Securitization Corp., Tobacco Settlement Rev., Taxable, “B”, 3%, 6/01/2046 | 3,315,000 | 3,089,307 | ||
| Massachusetts Educational Financing Authority, Education Loan Rev., Taxable, “A”, 2.682%, 7/01/2027 | 2,165,000 | 2,066,260 | ||
| Michigan Finance Authority Tobacco Settlement Asset-Backed Rev., Taxable (2006 Sold Tobacco Receipts), “A-1”, 2.326%, 6/01/2030 | 79,719 | 77,926 | ||
| Port of Oakland, CA, Senior Lien Refunding Rev., Taxable, “R”, 1.517%, 5/01/2026 | 1,413,570 | 1,353,470 | ||
| West Virginia Tobacco Settlement Financing Authority Asset-Backed Refunding, Taxable, “A-1”, 1.647%, 6/01/2025 | 1,550,000 | 1,525,538 | ||
| $9,097,501 | ||||
| U.S. Government Agencies and Equivalents – 0.1% | ||||
| Small Business Administration, 4.86%, 1/01/2025 | $ | 12,961 | $12,935 | |
| Small Business Administration, 5.11%, 4/01/2025 | 9,707 | 9,674 | ||
| Small Business Administration, 2.21%, 2/01/2033 | 525,465 | 485,110 | ||
| Small Business Administration, 2.22%, 3/01/2033 | 827,046 | 761,185 | ||
| Small Business Administration, 3.15%, 7/01/2033 | 772,147 | 730,376 | ||
| Small Business Administration, 3.16%, 8/01/2033 | 324,557 | 307,301 | ||
| Small Business Administration, 3.62%, 9/01/2033 | 299,170 | 287,266 | ||
| $2,593,847 | ||||
| U.S. Treasury Obligations – 29.5% | ||||
| U.S. Treasury Bonds, 6%, 2/15/2026 (f) | $ | 5,933,000 | $6,060,930 | |
| U.S. Treasury Bonds, 6.75%, 8/15/2026 | 981,000 | 1,023,765 | ||
| U.S. Treasury Bonds, 6.375%, 8/15/2027 | 2,309,000 | 2,443,662 | ||
| U.S. Treasury Bonds, 4.375%, 2/15/2038 | 2,078,000 | 2,105,923 | ||
| U.S. Treasury Bonds, 3.125%, 2/15/2043 | 9,748,800 | 8,100,644 | ||
| U.S. Treasury Bonds, 2.875%, 5/15/2043 | 27,528,200 | 21,942,986 | ||
| U.S. Treasury Bonds, 4.75%, 11/15/2043 | 11,168,000 | 11,584,619 | ||
| U.S. Treasury Bonds, 2.5%, 2/15/2045 | 97,983,000 | 71,730,445 | ||
| U.S. Treasury Bonds, 4.625%, 5/15/2054 | 59,072,000 | 61,407,190 | ||
| U.S. Treasury Bonds, 4.25%, 8/15/2054 | 10,146,000 | 9,922,471 | ||
| U.S. Treasury Notes, 2%, 11/15/2026 (f) | 51,959,000 | 49,846,136 | ||
| U.S. Treasury Notes, 3.75%, 8/15/2027 | 52,940,000 | 52,429,212 | ||
| U.S. Treasury Notes, 2.75%, 2/15/2028 | 54,157,000 | 51,950,525 | ||
| U.S. Treasury Notes, 3.625%, 3/31/2028 | 86,350,000 | 85,024,393 | ||
| U.S. Treasury Notes, 1%, 7/31/2028 | 32,248,000 | 28,854,402 | ||
| U.S. Treasury Notes, 2.375%, 5/15/2029 | 19,515,500 | 18,164,661 | ||
| U.S. Treasury Notes, 1.625%, 8/15/2029 | 29,405,000 | 26,356,528 | ||
| U.S. Treasury Notes, 1.75%, 11/15/2029 | 8,564,000 | 7,684,852 | ||
| U.S. Treasury Notes, 3.5%, 4/30/2030 | 18,675,000 | 18,127,881 | ||
| U.S. Treasury Notes, 4.125%, 8/31/2030 | 37,647,000 | 37,645,530 | ||
| U.S. Treasury Notes, 1.625%, 5/15/2031 | 41,833,000 | 35,945,332 | ||
| U.S. Treasury Notes, 1.375%, 11/15/2031 | 11,425,300 | 9,528,522 | ||
| $617,880,609 | ||||
| Total Bonds | $1,975,910,886 | |||
| Investment Companies (h) – 10.1% | ||||
| Money Market Funds – 10.1% | ||||
| MFS Institutional Money Market Portfolio, 4.66% (v) | 211,280,719 | $211,301,847 | ||
| Other Assets, Less Liabilities – (4.5)% | (93,458,837) | |||
| Net Assets – 100.0% | $2,093,753,896 | |||
| (f) | All or a portion of the security has been segregated as collateral for open futures contracts and cleared swap agreements. |
5
Portfolio of Investments (unaudited) – continued
| (h) | An affiliated issuer, which may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. At period end, the aggregate values of the fund's investments in affiliated issuers and in unaffiliated issuers were $211,301,847 and $1,975,910,886, respectively. | |||
| (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. | |||
| (n) | Securities exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be sold in the ordinary course of business in transactions exempt from registration, normally to qualified institutional buyers. At period end, the aggregate value of these securities was $129,268,968, representing 6.2% of net assets. | |||
| (v) | Affiliated issuer that is available only to investment companies managed by MFS. The rate quoted for the MFS Institutional Money Market Portfolio is the annualized seven-day yield of the fund at period end. |
| The following abbreviations are used in this report and are defined: | |
| CLO | Collateralized Loan Obligation |
| FLR | Floating Rate. Interest rate resets periodically based on the parenthetically disclosed reference rate plus a spread (if any). The period-end rate reported may not be the current rate. All reference rates are USD unless otherwise noted. |
| SOFR | Secured Overnight Financing Rate |
| TBA | To Be Announced |
| UMBS | Uniform Mortgage-Backed Security |
| Derivative Contracts at 11/30/24 | ||||||
| Futures Contracts | ||||||
| Description | Long/ Short | Currency | Contracts | Notional Amount | Expiration Date | Value/Unrealized Appreciation (Depreciation) |
| Asset Derivatives | ||||||
| Interest Rate Futures | ||||||
| U.S. Treasury Note 10 yr | Long | USD | 706 | $78,498,375 | March – 2025 | $1,072,934 |
| U.S. Treasury Note 2 yr | Long | USD | 794 | 163,650,845 | March – 2025 | 336,281 |
| U.S. Treasury Note 5 yr | Long | USD | 2,175 | 234,033,399 | March – 2025 | 1,679,768 |
| U.S. Treasury Ultra Note 10 yr | Long | USD | 799 | 91,722,703 | March – 2025 | 463,500 |
| $3,552,483 | ||||||
| Liability Derivatives | ||||||
| Interest Rate Futures | ||||||
| U.S. Treasury Ultra Bond 30 yr | Short | USD | 174 | $22,130,625 | March – 2025 | $(738,646) |
| Cleared Swap Agreements | ||||||||||
| Maturity Date | Notional Amount | Counterparty | Cash Flows to Receive/ Frequency | Cash Flows to Pay/ Frequency | Unrealized Appreciation (Depreciation) | Net Unamortized Upfront Payments (Receipts) | Value | |||
| Asset Derivatives | ||||||||||
| Interest Rate Swaps | ||||||||||
| 10/30/54 | USD | 11,350,000 | centrally cleared | 3.696% / Annually | Daily SOFR / Annually | $236,887 | $— | $236,887 | ||
| Liability Derivatives | ||||||||||
| Interest Rate Swaps | ||||||||||
| 5/24/26 | USD | 96,000,000 | centrally cleared | Daily SOFR / Annually | 4.7585% / Annually | $(681,901) | $— | $(681,901) | ||
At November 30, 2024, the fund had liquid securities with an aggregate value of $7,514,398 to cover any collateral or margin obligations for certain derivative contracts.
See attached supplemental information. For more information see notes to financial statements as disclosed in the most recent semiannual or annual report.
6
Supplemental Information
11/30/24 (unaudited)
The fund is an investment company and accordingly follows the investment company accounting and reporting guidance of the Financial Accounting Standards Board (FASB) Accounting Standards Codification Topic 946 Financial Services - Investment Companies.
(1) Investment Valuations
Subject to its oversight, the fund's Board of Trustees has delegated primary responsibility for determining or causing to be determined the value of the fund’s investments to MFS as the fund's adviser, pursuant to the fund’s valuation policy and procedures which have been adopted by the adviser and approved by the Board. In accordance with Rule 2a-5 under the Investment Company Act of 1940, the Board of Trustees designated the adviser as the “valuation designee” of the fund. If the adviser, as valuation designee, determines that reliable market quotations are not readily available for an investment, the investment is valued at fair value as determined in good faith by the adviser in accordance with the adviser’s fair valuation policy and procedures.
Under the fund's valuation policy and procedures, debt instruments and floating rate loans, including restricted debt instruments, are generally valued at an evaluated or composite bid as provided by a third-party pricing service. Short-term instruments with a maturity at issuance of 60 days or less may be valued at amortized cost, which approximates market value. Futures contracts are generally valued at last posted settlement price on their primary exchange as provided by a third-party pricing service. Futures contracts for which there were no trades that day for a particular position are generally valued at the closing bid quotation on their primary exchange as provided by a third-party pricing service. Swap agreements are generally valued using valuations provided by a third-party pricing service, which for cleared swaps includes an evaluation of any trading activity at the clearinghouses. Open-end investment companies are generally valued at net asset value per share. The values of foreign securities and other assets and liabilities expressed in foreign currencies are converted to U.S. dollars using the mean of bid and asked prices for rates provided by a third-party pricing service.
Under the fund’s valuation policy and procedures, market quotations are not considered to be readily available for debt instruments, floating rate loans, and many types of derivatives. These investments are generally valued at fair value based on information from third-party pricing services or otherwise determined by the adviser in accordance with the adviser’s fair valuation policy and procedures. Securities and other assets generally valued on the basis of information from a third-party pricing service may also be valued at a broker/dealer bid quotation. In determining values, third-party pricing services can utilize both transaction data and market information such as yield, quality, coupon rate, maturity, type of issue, trading characteristics, spreads and other market data. Pricing services generally value debt instruments assuming orderly transactions of institutional round lot sizes, but a fund may hold or transact in such securities in smaller, odd lot sizes. Odd lots may trade at lower prices than institutional round lots, and the fund may receive different prices when it sells odd lot positions than it would receive for sales of institutional round lot positions. An investment may also be valued at fair value if the adviser determines that the investment’s value has been materially affected by events occurring after the close of the exchange or market on which the investment is principally traded (such as foreign exchange or market) and prior to the determination of the fund’s net asset value, or after the halt of trading of a specific security where trading does not resume prior to the close of the exchange or market on which the security is principally traded. The adviser generally relies on third-party pricing services or other information (such as the correlation with price movements of similar securities in the same or other markets; the type, cost and investment characteristics of the security; the business and financial condition of the issuer; and trading and other market data) to assist in determining whether to fair value and at what value to fair value an investment. The value of an investment for purposes of calculating the fund’s net asset value can differ depending on the source and method used to determine value. When fair valuation is used, the value of an investment used to determine the fund’s net asset value may differ from quoted or published prices for the same investment. There can be no assurance that the fund could obtain the fair value assigned to an investment if it were to sell the investment at the same time at which the fund determines its net asset value per share.
Various inputs are used in determining the value of the fund's assets or liabilities. These inputs are categorized into three broad levels. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, an investment's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. The fund's assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment, and considers factors specific to the investment. Level 1 includes unadjusted quoted prices in active markets for identical assets or liabilities. Level 2 includes other significant observable market-based inputs (including quoted prices for similar securities, interest rates, prepayment speed, and credit risk).
7
Supplemental Information (unaudited) – continued
Level 3 includes significant unobservable inputs, which may include the adviser's own assumptions in determining the fair value of investments. Other financial instruments are derivative instruments, such as futures contracts and swap agreements. The following is a summary of the levels used as of November 30, 2024 in valuing the fund's assets and liabilities:
| Financial Instruments | Level 1 | Level 2 | Level 3 | Total |
| U.S. Treasury Bonds & U.S. Government Agencies & Equivalents | $— | $620,474,456 | $— | $620,474,456 |
| Municipal Bonds | — | 9,097,501 | — | 9,097,501 |
| U.S. Corporate Bonds | — | 4,528,746 | — | 4,528,746 |
| Residential Mortgage-Backed Securities | — | 1,196,770,665 | — | 1,196,770,665 |
| Commercial Mortgage-Backed Securities | — | 62,832,509 | — | 62,832,509 |
| Asset-Backed Securities (including CDOs) | — | 82,207,009 | — | 82,207,009 |
| Mutual Funds | 211,301,847 | — | — | 211,301,847 |
| Total | $211,301,847 | $1,975,910,886 | $— | $2,187,212,733 |
| Other Financial Instruments | ||||
| Futures Contracts – Assets | $3,552,483 | $— | $— | $3,552,483 |
| Futures Contracts – Liabilities | (738,646) | — | — | (738,646) |
| Swap Agreements – Assets | — | 236,887 | — | 236,887 |
| Swap Agreements – Liabilities | — | (681,901) | — | (681,901) |
(2) Investments in Affiliated Issuers
An affiliated issuer may be considered one in which the fund owns 5% or more of the outstanding voting securities, or a company which is under common control. For the purposes of this report, the following were affiliated issuers for the period ended November 30, 2024:
| Affiliated Issuers | Beginning Value | Purchases | Sales Proceeds | Realized Gain (Loss) | Change in Unrealized Appreciation or Depreciation | Ending Value |
| MFS Institutional Money Market Portfolio | $34,364,117 | $1,153,393,666 | $976,444,171 | $(10,218) | $(1,547) | $211,301,847 |
| Affiliated Issuers | Dividend Income | Capital Gain Distributions |
| MFS Institutional Money Market Portfolio | $5,281,342 | $— |
8