0001752724-24-141089.txt : 20240624 0001752724-24-141089.hdr.sgml : 20240624 20240624110342 ACCESSION NUMBER: 0001752724-24-141089 CONFORMED SUBMISSION TYPE: NPORT-P PUBLIC DOCUMENT COUNT: 1 CONFORMED PERIOD OF REPORT: 20240430 FILED AS OF DATE: 20240624 DATE AS OF CHANGE: 20240624 PERIOD START: 20241031 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MFS SERIES TRUST IX CENTRAL INDEX KEY: 0000063075 ORGANIZATION NAME: IRS NUMBER: 042535629 STATE OF INCORPORATION: MA FISCAL YEAR END: 0430 FILING VALUES: FORM TYPE: NPORT-P SEC ACT: 1940 Act SEC FILE NUMBER: 811-02464 FILM NUMBER: 241062765 BUSINESS ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 21ST FLOOR CITY: BOSTON STATE: MA ZIP: 02199 BUSINESS PHONE: 18006372929 MAIL ADDRESS: STREET 1: 111 HUNTINGTON AVENUE STREET 2: 21ST FLOOR CITY: BOSTON STATE: MA ZIP: 02199 FORMER COMPANY: FORMER CONFORMED NAME: MFS SERIES TRUST IX /MA/ DATE OF NAME CHANGE: 19951218 FORMER COMPANY: FORMER CONFORMED NAME: MFS SERIES TRUST IX DATE OF NAME CHANGE: 19950207 FORMER COMPANY: FORMER CONFORMED NAME: MFS BOND FUND DATE OF NAME CHANGE: 19930408 0000063075 S000002493 MFS Inflation-Adjusted Bond Fund C000006724 A MIAAX C000006725 R4 MIAJX C000006726 B MIABX C000006727 C MIACX C000006728 I MIAIX C000006730 R1 MIALX C000006732 R2 MIATX C000006733 R3 MIAHX C000126364 R6 MIAKX NPORT-P 1 primary_doc.xml NPORT-P false 0000063075 XXXXXXXX S000002493 C000006724 C000006725 C000126364 C000006733 C000006728 C000006726 C000006732 C000006730 C000006727 MFS SERIES TRUST IX 811-02464 0000063075 549300IJONSVWD5I9F62 111 HUNTINGTON AVENUE BOSTON 02199 617-954-5000 MFS Inflation-Adjusted Bond Fund S000002493 VOHO802M9IKG3IZTEN75 2024-10-31 2024-04-30 N 1494173750.80 795956.33 1493377794.47 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 EUR USD N BBG US Treasury Infl Prot Sec Idx LBUTTRUU FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137F9ZC8 11388256.00000000 PA USD 498276.06000000 0.033365707046 Long ABS-MBS USGSE US N 2 2031-01-25 Variable 0.87000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810TE8 48632277.50000000 PA USD 26352818.17000000 1.764645106388 Long DBT UST US N 2 2052-02-15 Fixed 0.13000000 N N N N N N Michigan Finance Authority N/A 59447TV83 1426919.09000000 PA USD 1331386.14000000 0.089152667525 Long ABS-O CORP US N 2 2061-07-25 Fixed 1.30000000 N N N N N N Tobacco Settlement Finance Authority N/A 88880LAG8 835000.00000000 PA USD 796757.84000000 0.053352731167 Long DBT MUN US N 2 2025-06-01 Fixed 1.65000000 N N N N N N BENCHMARK Mortgage Trust N/A 08163CBE8 15434148.48000000 PA USD 784181.30000000 0.052510577223 Long ABS-MBS CORP US N 2 2054-03-15 Variable 1.26000000 N N N N N N AREIT CRE Trust N/A 04002VAC5 2462500.00000000 PA USD 2423759.95000000 0.162300521607 Long ABS-CBDO CORP KY Y 2 2037-01-20 Floating 6.98000000 N N N N N N Toledo Hospital/The 5493009DCR7NWV6K4T34 889184AD9 747000.00000000 PA USD 739262.05000000 0.049502681286 Long DBT CORP US N 2 2038-11-15 Fixed 5.75000000 N N N N N N Barclays Commercial Mortgage Securities LLC N/A 05551VBK8 13180888.51000000 PA USD 827688.62000000 0.055423927090 Long ABS-MBS CORP US N 2 2054-07-15 Variable 1.40000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 91282CGK1 33702230.00000000 PA USD 30648547.44000000 2.052296984292 Long DBT UST US N 2 2033-01-15 Fixed 1.13000000 N N N N N N Michigan Finance Authority 54930022O46HOX5J1D14 59447TH89 312761.77000000 PA USD 304919.61000000 0.020418115973 Long DBT MUN US N 2 2030-06-01 Fixed 2.33000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FXZ50 29737713.91000000 PA USD 492878.82000000 0.033004295485 Long ABS-MBS USGSE US N 2 2031-01-25 Variable 0.42000000 N N N N N N Barclays Commercial Mortgage Securities LLC N/A 05493EAZ5 7991792.79000000 PA USD 626721.19000000 0.041966687352 Long ABS-MBS CORP US N 2 2054-02-15 Variable 1.73000000 N N N N N N Wells Fargo Commercial Mortgage Trust N/A 95003DBP2 9362776.53000000 PA USD 682521.13000000 0.045703179230 Long ABS-MBS CORP US N 2 2054-08-15 Variable 1.65000000 N N N N N N Colorado Health Facilities Authority 5493002JB6DRFRZPEQ21 19648FRX4 715000.00000000 PA USD 668463.72000000 0.044761862837 Long DBT MUN US N 2 2026-12-01 Fixed 2.80000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810RL4 58045580.64000000 PA USD 42017396.41000000 2.813581169185 Long DBT UST US N 2 2045-02-15 Fixed 0.75000000 N N N N N N PFP III N/A 69357XAC5 3622500.00000000 PA USD 3525724.91000000 0.236090621077 Long ABS-CBDO CORP KY Y 2 2037-08-09 Floating 6.68000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H3EZ1 9783880.00000000 PA USD 487383.98000000 0.032636348404 Long ABS-MBS USGSE US N 2 2031-09-25 Variable 0.96000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137F9Z38 8529316.00000000 PA USD 438699.40000000 0.029376317340 Long ABS-MBS USGSE US N 2 2031-01-25 Variable 1.03000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810SV1 14309240.56000000 PA USD 7903957.29000000 0.529267096328 Long DBT UST US N 2 2051-02-15 Fixed 0.13000000 N N N N N N Bank N/A 06541ABM1 19192830.66000000 PA USD 1235922.33000000 0.082760192000 Long ABS-MBS CORP US N 2 2054-02-15 Variable 1.40000000 N N N N N N BENCHMARK Mortgage Trust N/A 08162RAF4 25321960.05000000 PA USD 1453450.12000000 0.097326351401 Long ABS-MBS CORP US N 2 2054-02-15 Variable 1.37000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810FD5 62278109.53000000 PA USD 65182451.04000000 4.364766322451 Long DBT UST US N 2 2028-04-15 Fixed 3.63000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FNXA3 6098473.24000000 PA USD 6118610.40000000 0.409716176486 Long ABS-MBS USGSE US N 2 2029-08-25 Floating 5.96000000 N N N N N N Massachusetts Educational Financing Authority 5493007K5OP7V6CL0Y88 57563RRZ4 7455000.00000000 PA USD 6548253.57000000 0.438486067909 Long DBT MUN US N 2 2037-07-01 Fixed 2.64000000 N N N N N N LCH Limited F226TOH6YD6XJB17KS62 000000000 40400000.00000000 OU Notional Amount USD 4279.98000000 0.000286597270 N/A DIR US N 2 LCH Limited F226TOH6YD6XJB17KS62 N/A N/A Y Inflation based on US CPI Urban Consumers NSA 2026-04-15 0.00000000 USD 0.00000000 USD 40400000.00000000 USD 4279.98000000 N N N Golden State Tobacco Securitization Corp N/A 38122NB76 2400000.00000000 PA USD 2193650.64000000 0.146891874790 Long DBT MUN US N 2 2046-06-01 Fixed 3.00000000 N N N N N N BUONI POLIENNALI DEL TES 815600DE60799F5A9309 000000000 26175426.10000000 PA 29792627.39000000 1.994982615941 Long DBT NUSS IT N 2 2035-09-15 Fixed 2.35000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810RA8 35656874.09000000 PA USD 25940710.72000000 1.737049446969 Long DBT UST US N 2 2043-02-15 Fixed 0.63000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FUZZ0 6326494.00000000 PA USD 533771.99000000 0.035742595877 Long ABS-MBS USGSE US N 2 2030-05-25 Variable 1.77000000 N N N N N N Morgan Stanley Capital Services LLC I7331LVCZKQKX5T7XV54 000000000 1.00000000 NC -55961.55000000 -0.00374731365 N/A DFE US N 2 Morgan Stanley Capital Services LLC I7331LVCZKQKX5T7XV54 27618927.25000000 EUR 29516568.50000000 USD 2024-07-19 -55961.55000000 N N N Dell Equipment Finance Trust N/A 24702EAB6 1416000.00000000 PA USD 1418421.64000000 0.094980764094 Long ABS-O CORP US Y 2 2029-04-23 Fixed 6.10000000 N N N N N N Chicago Board of Trade 549300EX04Q2QBFQTQ27 000000000 -730.00000000 NC USD 877077.20000000 0.058731099608 N/A DIR US N 1 Chicago Board of Trade 549300EX04Q2QBFQTQ27 Short CBOT 5 Year U.S. Treasury Note Futures FVM4 Comdty 2024-06-28 -77338874.44000000 USD 877077.20000000 N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FYUL8 36311915.30000000 PA USD 990225.93000000 0.066307797910 Long ABS-MBS USGSE US N 2 2031-03-25 Variable 0.61000000 N N N N N N BENCHMARK Mortgage Trust N/A 08163GAZ3 25220968.07000000 PA USD 1574855.25000000 0.105455917171 Long ABS-MBS CORP US N 2 2054-08-15 Variable 1.38000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912828V49 56292108.24000000 PA USD 53242337.48000000 3.565228951251 Long DBT UST US N 2 2027-01-15 Fixed 0.38000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810QV3 133998735.20000000 PA USD 101539298.32000000 6.799304147684 Long DBT UST US N 2 2042-02-15 Fixed 0.75000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 9128282L3 89737665.57000000 PA USD 84500624.76000000 5.658355512778 Long DBT UST US N 2 2027-07-15 Fixed 0.38000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H2NA8 7521262.00000000 PA USD 423140.18000000 0.028334436307 Long ABS-MBS USGSE US N 2 2031-07-25 Variable 1.04000000 N N N N N N Morgan Stanley Capital I Trust N/A 61772TBN3 27429527.44000000 PA USD 1398900.41000000 0.093673577789 Long ABS-MBS CORP US N 2 2054-10-15 Variable 1.20000000 N N N N N N Morgan Stanley & Co. LLC 9R7GPTSO7KV3UQJZQ078 000000000 79900000.00000000 OU Notional Amount USD 367895.56000000 0.024635129929 N/A DIR US N 2 Morgan Stanley & Co. LLC 9R7GPTSO7KV3UQJZQ078 N/A N/A Y Inflation based on US CPI Urban Consumers NSA 2026-03-19 0.00000000 USD 0.00000000 USD 79900000.00000000 USD 367895.56000000 N N N School District of Philadelphia/The 254900HSKDHZKBZCUL90 717883UB6 1925000.00000000 PA USD 1978626.46000000 0.132493362853 Long DBT MUN US N 2 2030-09-01 Fixed 6.00000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H4BT6 32486236.00000000 PA USD 1038227.62000000 0.069522101094 Long ABS-MBS USGSE US N 2 2031-09-25 Variable 0.63000000 N N N N N N 3650R Commercial Mortgage Trust N/A 88581EAF8 14595910.82000000 PA USD 671587.05000000 0.044971008172 Long ABS-MBS CORP US N 2 2054-11-15 Variable 1.13000000 N N N N N N MFS Institutional Money Market Portfolio 5L2W638H85N8T1136O07 55291X109 34612841.36000000 NS USD 34612841.36000000 2.317755191497 Long STIV RF US N 1 N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H13T1 4421663.00000000 PA USD 305662.05000000 0.020467831457 Long ABS-MBS USGSE US N 2 2031-05-25 Variable 1.32000000 N N N N N N New Jersey Turnpike Authority 5493005YN67D71KSMI84 646140DP5 745000.00000000 PA USD 695610.97000000 0.046579704919 Long DBT MUN US N 2 2026-01-01 Fixed 1.05000000 N N N N N N Chicago Board of Trade 549300EX04Q2QBFQTQ27 000000000 -25.00000000 NC USD 124125.00000000 0.008311694499 N/A DIR US N 1 Chicago Board of Trade 549300EX04Q2QBFQTQ27 Short CBOT U.S. Long Bond Futures USM4 Comdty 2024-06-18 -2969437.50000000 USD 124125.00000000 N N N HOWARD UNIVERSITY N/A 442851AG6 402000.00000000 PA USD 382823.77000000 0.025634757086 Long DBT CORP US N 2 2025-10-01 Fixed 2.52000000 N N N N N N Tobacco Settlement Finance Authority N/A 88880LAF0 1020000.00000000 PA USD 1015918.98000000 0.068028263428 Long DBT MUN US N 2 2024-06-01 Fixed 1.50000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 91282CBF7 135774176.34000000 PA USD 117966032.66000000 7.899275929830 Long DBT UST US N 2 2031-01-15 Fixed 0.13000000 N N N N N N American Credit Acceptance Receivables Trust N/A 02531AAA9 1534848.56000000 PA USD 1532161.50000000 0.102597045816 Long ABS-O CORP US Y 2 2027-01-12 Fixed 5.61000000 N N N N N N Morgan Stanley Capital I Trust N/A 61692CBK3 12732094.10000000 PA USD 670827.30000000 0.044920133571 Long ABS-MBS CORP US N 2 2054-06-15 Variable 1.32000000 N N N N N N Morgan Stanley Capital I Trust N/A 61691YAP6 10223122.47000000 PA USD 597726.55000000 0.040025139801 Long ABS-MBS CORP US N 2 2054-05-15 Variable 1.41000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 91282CHP9 48234618.74000000 PA USD 44778667.64000000 2.998482219691 Long DBT UST US N 2 2033-07-15 Fixed 1.38000000 N N N N N N Chicago Transit Authority Sales Tax Receipts Fund N/A 16772PCK0 523000.00000000 PA USD 512570.65000000 0.034322905556 Long DBT MUN US N 2 2024-12-01 Fixed 2.06000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FTG43 3519182.00000000 PA USD 314213.33000000 0.021040444766 Long ABS-MBS USGSE US N 2 2030-04-25 Variable 1.92000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 9128283R9 55444843.68000000 PA USD 51788050.54000000 3.467846564464 Long DBT UST US N 2 2028-01-15 Fixed 0.50000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 9128285W6 260539397.00000000 PA USD 244300182.21000000 16.35890014667 Long DBT UST US N 2 2029-01-15 Fixed 0.88000000 N N N N N N TOLEDO HOSPITAL/THE 5493009DCR7NWV6K4T34 889184AF4 2421000.00000000 PA USD 2376088.85000000 0.159108355487 Long DBT CORP US N 2 2028-11-15 Fixed 5.33000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810TY4 2391369.75000000 PA USD 2244751.16000000 0.150313682734 Long DBT UST US N 2 2054-02-15 Fixed 2.13000000 N N N N N N Chicago Board of Trade 549300EX04Q2QBFQTQ27 000000000 -170.00000000 NC USD 577026.75000000 0.038639033748 N/A DIR US N 1 Chicago Board of Trade 549300EX04Q2QBFQTQ27 Short Ultra 10-Year U.S. Treasury Notes Futures UXYM4 Comdty 2024-06-18 -19314214.25000000 USD 577026.75000000 N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H4SM3 8215224.00000000 PA USD 283446.59000000 0.018980233337 Long ABS-MBS USGSE US N 2 2031-12-25 Variable 0.67000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912810SB5 21575953.80000000 PA USD 15914509.18000000 1.065672011391 Long DBT UST US N 2 2048-02-15 Fixed 1.00000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137F62R7 3529812.00000000 PA USD 217172.39000000 0.014542361002 Long ABS-MBS USGSE US N 2 2030-09-25 Variable 1.26000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FQ2W2 2244331.69000000 PA USD 2252243.63000000 0.150815395698 Long ABS-MBS USGSE US N 2 2029-09-25 Floating 6.00000000 N N N N N N SBNA Auto Lease Trust N/A 78414SAC8 1979000.00000000 PA USD 1974728.53000000 0.132232348526 Long ABS-O CORP US Y 2 2026-01-20 Fixed 5.45000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H4CH1 49721062.00000000 PA USD 1107223.41000000 0.074142217334 Long ABS-MBS USGSE US N 2 2031-11-25 Variable 0.44000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FV5Q1 9780585.87000000 PA USD 637641.38000000 0.042697928304 Long ABS-MBS USGSE US N 2 2030-06-25 Variable 1.48000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137FXYZ5 54980294.00000000 PA USD 1689626.91000000 0.113141290586 Long ABS-MBS USGSE US N 2 2031-01-25 Variable 0.63000000 N N N N N N BSPDF 2021-FL1 Issuer Ltd N/A 055731AC7 3056500.00000000 PA USD 2956855.04000000 0.197997790709 Long ABS-CBDO CORP KY Y 2 2036-10-15 Floating 6.92000000 N N N N N N Merrill Lynch International GGDZP1UYGU9STUHRDP48 000000000 79900000.00000000 OU Notional Amount USD 791612.45000000 0.053008184059 N/A DIR US N 2 Merrill Lynch International GGDZP1UYGU9STUHRDP48 N/A N/A Y Inflation based on US CPI Urban Consumers NSA 2026-02-08 0.00000000 USD 0.00000000 USD 79900000.00000000 USD 791612.45000000 N N N Chicago Board of Trade 549300EX04Q2QBFQTQ27 000000000 249.00000000 NC USD -480331.96000000 -0.03216412898 N/A DIR US N 1 Chicago Board of Trade 549300EX04Q2QBFQTQ27 Long CBOT 2 Year U.S. Treasury Notes Futures TUM4 Comdty 2024-06-28 50941738.21000000 USD -480331.96000000 N N N United States Treasury 254900HROIFWPRGM1V77 91282CDX6 204327635.57000000 PA USD 173716454.31000000 11.63245194573 Long DBT UST US N 2 2032-01-15 Fixed 0.13000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912828N71 118551353.46000000 PA USD 114628050.53000000 7.675756995615 Long DBT UST US N 2 2026-01-15 Fixed 0.63000000 N N N N N N Westlake Automobile Receivables Trust N/A 96043RAC1 3062000.00000000 PA USD 3062600.76000000 0.205078766494 Long ABS-O CORP US Y 2 2027-03-15 Floating 5.90000000 N N N N N N FHLMC Multifamily Structured Pass Through Certs. S6XOOCT0IEG5ABCC6L87 3137H5DT1 50485813.00000000 PA USD 1549343.97000000 0.103747623390 Long ABS-MBS USGSE US N 2 2031-12-25 Variable 0.60000000 N N N N N N United States Treasury 254900HROIFWPRGM1V77 912828ZZ6 174372934.12000000 PA USD 153705092.64000000 10.29244530146 Long DBT UST US N 2 2030-07-15 Fixed 0.13000000 N N N N N N BENCHMARK Mortgage Trust N/A 08163HAG3 20875842.77000000 PA USD 1204139.49000000 0.080631940186 Long ABS-MBS CORP US N 2 2054-07-15 Variable 1.37000000 N N N N N N CONSERVATION FUND N/A 20848FAA8 1438000.00000000 PA USD 1273395.56000000 0.085269485371 Long DBT CORP US N 2 2029-12-15 Fixed 3.47000000 N N N N N N 2024-05-14 MFS SERIES TRUST IX James Byrne James Byrne Assistant Treasurer