N-MFP3 0000063068 XXXXXXXX 2026-09-30 MFS SERIES TRUST IV 0000063068 549300SSA281MOJG8J61 MFS U.S. Government Money Market Fund MQMNIX2D6ZVLO9HEKW73 S000002435 1 N N 002-54607 Massachusetts Financial Services Company 801-17352 Deloitte & Touche LLP Boston MA Massachusetts Financial Services Company MFS Service Center, Inc 0000769188 084-01316 N N N Government N N 33 33 225940211.72 292464632.25 0.7327 0.9485 2026-09-01 216758893.60 283290192.68 0.7020 0.9175 2026-09-02 224560994.62 283301327.48 0.7273 0.9175 2026-09-03 214831639.39 283124854.82 0.6960 0.9172 2026-09-04 214251793.02 289728203.45 0.6955 0.9405 2026-09-08 214981569.02 290464834.87 0.6961 0.9406 2026-09-09 214830172.75 290320889.37 0.6960 0.9405 2026-09-10 214698154.68 290193588.25 0.6957 0.9403 2026-09-11 216954420.02 292473170.17 0.6979 0.9408 2026-09-14 217113238.99 292639930.53 0.6980 0.9408 2026-09-15 217191161.76 292725794.76 0.6981 0.9409 2026-09-16 217153180.23 292692207.41 0.6980 0.9408 2026-09-17 217262784.55 292809108.50 0.6981 0.9409 2026-09-18 217452985.34 293023873.68 0.6983 0.9410 2026-09-21 217413835.76 292992024.17 0.6983 0.9410 2026-09-22 218932953.97 294520388.81 0.6997 0.9413 2026-09-23 218752835.99 294348358.67 0.6995 0.9412 2026-09-24 219550990.44 295154217.78 0.7001 0.9412 2026-09-25 219285144.86 294912691.28 0.6999 0.9413 2026-09-28 214427245.66 283863448.44 0.6895 0.9128 2026-09-29 223349947.76 283725670.26 0.7177 0.9117 2026-09-30 1.20 310724785.35 310772429.27 439345.09 920466.74 310291308.82 310291800.4550 Y 1.0000 0.0373 2026-09-01 0.0373 2026-09-02 0.0373 2026-09-03 0.0373 2026-09-04 0.0373 2026-09-08 0.0373 2026-09-09 0.0373 2026-09-10 0.0373 2026-09-11 0.0373 2026-09-14 0.0373 2026-09-15 0.0373 2026-09-16 0.0374 2026-09-17 0.0378 2026-09-18 0.0379 2026-09-21 0.0381 2026-09-22 0.0382 2026-09-23 0.0383 2026-09-24 0.0384 2026-09-25 0.0384 2026-09-28 0.0385 2026-09-29 0.0385 2026-09-30 0.9999 2026-09-01 0.9999 2026-09-02 1.0000 2026-09-03 0.9999 2026-09-04 0.9999 2026-09-08 0.9999 2026-09-09 0.9999 2026-09-10 0.9998 2026-09-11 0.9998 2026-09-14 0.9998 2026-09-15 0.9998 2026-09-16 0.9998 2026-09-17 0.9997 2026-09-18 0.9998 2026-09-21 0.9998 2026-09-22 0.9998 2026-09-23 0.9998 2026-09-24 0.9997 2026-09-25 0.9998 2026-09-28 0.9998 2026-09-29 0.9998 2026-09-30 N N A C000006517 1000.00 310291308.82 310291800.4550 0.9999 2026-09-01 0.9999 2026-09-02 1.0000 2026-09-03 0.9999 2026-09-04 0.9999 2026-09-08 0.9999 2026-09-09 0.9999 2026-09-10 0.9998 2026-09-11 0.9998 2026-09-14 0.9998 2026-09-15 0.9998 2026-09-16 0.9998 2026-09-17 0.9997 2026-09-18 0.9998 2026-09-21 0.9998 2026-09-22 0.9998 2026-09-23 0.9998 2026-09-24 0.9997 2026-09-25 0.9998 2026-09-28 0.9998 2026-09-29 0.9998 2026-09-30 1093812.86 393882.00 2026-09-01 641962.35 199881.82 2026-09-02 8931.71 32549.20 2026-09-03 85313.93 323820.55 2026-09-04 34330.21 684660.92 2026-09-08 1144835.25 475700.33 2026-09-09 128805.24 232928.13 2026-09-10 52293.93 215500.91 2026-09-11 2337666.07 110724.70 2026-09-14 378437.34 224848.70 2026-09-15 566621.00 553793.27 2026-09-16 187829.81 191903.59 2026-09-17 466269.79 473626.96 2026-09-18 345445.57 205222.95 2026-09-21 93466.47 159522.63 2026-09-22 1800561.64 285897.55 2026-09-23 653.94 204528.67 2026-09-24 931499.70 166041.10 2026-09-25 224529.77 536037.80 2026-09-28 241305.38 2474684.88 2026-09-29 481712.84 233082.97 2026-09-30 11246284.80 8378839.63 0.0328 2026-09-01 0.0328 2026-09-02 0.0328 2026-09-03 0.0328 2026-09-04 0.0329 2026-09-08 0.0329 2026-09-09 0.0329 2026-09-10 0.0329 2026-09-11 0.0328 2026-09-14 0.0328 2026-09-15 0.0328 2026-09-16 0.0330 2026-09-17 0.0333 2026-09-18 0.0335 2026-09-21 0.0336 2026-09-22 0.0337 2026-09-23 0.0338 2026-09-24 0.0339 2026-09-25 0.0340 2026-09-28 0.0340 2026-09-29 0.0341 2026-09-30 Y 49296.00 Broker-dealer 0.3487 0.00 Broker-dealer 0.0523 0.00 N Bank of America NA Bank of America NA 3.870000% 03199T002 549300HN4UKV1E2R3U73 0001102113 03199T002_3.87_1001 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N N N U.S. Treasury Note 254900HROIFWPRGM1V77 91282CNC1 2035-05-15 4.250000 0.00 60648000.00 57463980.00 U.S. Treasuries (including strips) Y 2026-10-01 2026-10-01 2026-10-01 N N N 0.0387 56218000.00 56218000.00 0.1812 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312DC1 254900C5LP6DN9OP9V83 US313312DC11 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2027-03-16 2027-03-16 2027-03-16 N N N 0.0409 8731139.77 8731139.77 0.0281 N N N N Federal Farm Credit Bank Federal Farm Credit Bank 313313M39 254900C5LP6DN9OP9V83 US313313M399 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-28 2026-10-28 2026-10-28 N N N 0.0381 9571552.03 9571552.03 0.0308 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313313N20 254900C5LP6DN9OP9V83 US313313N207 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-11-04 2026-11-04 2026-11-04 N N N 0.0392 7172560.01 7172560.01 0.0231 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384BY4 2549001DPIFGXC1TOL40 US313384BY44 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2027-02-16 2027-02-16 2027-02-16 N N N 0.0406 8662220.07 8662220.07 0.0279 N N N N Federal Home Loan Bank Federal Home Loan Bank 313385J49 2549001DPIFGXC1TOL40 US313385J492 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-05 2026-10-05 2026-10-05 N N N 0.0381 8795343.30 8795343.30 0.0283 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313385J80 2549001DPIFGXC1TOL40 US313385J807 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-09 2026-10-09 2026-10-09 N N N 0.0381 6493808.75 6493808.75 0.0209 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313385K70 2549001DPIFGXC1TOL40 US313385K706 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-16 2026-10-16 2026-10-16 N N N 0.0381 9334167.36 9334167.36 0.0301 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313385U87 2549001DPIFGXC1TOL40 US313385U879 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-12-28 2026-12-28 2026-12-28 N N N 0.0393 9605756.45 9605756.45 0.0310 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313397K59 S6XOOCT0IEG5ABCC6L87 US313397K594 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-14 2026-10-14 2026-10-14 N N N 0.0381 9236294.55 9236294.55 0.0298 N N Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313589H89 B1V7KEBTPIMZEU4LTD58 US313589H899 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-01 2026-10-01 2026-10-01 N N N 0.0000 9069040.12 9069040.12 0.0292 N Y Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313589M26 B1V7KEBTPIMZEU4LTD58 US313589M261 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-10-27 2026-10-27 2026-10-27 N N N 0.0381 9771996.50 9771996.50 0.0315 N N Y N Fixed Income Clearing Corp. - State Street Bank & Trust Co. Fixed Income Clearing Corp. - State Street Bank & Trust Co. 3.840000% 85748R009 549300H47WTHXPU08X20 0000093748 85748R009_3.84_1001 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N Y Fixed Income Clearing Corp. N U.S. Treasury Note 254900HROIFWPRGM1V77 91282CQQ7 2036-05-15 4.375000 0.00 49596900.00 47148060.01 U.S. Treasuries (including strips) U.S. Treasury Note 254900HROIFWPRGM1V77 91282CQZ7 2029-07-15 4.125000 0.00 10334400.00 10195111.82 U.S. Treasuries (including strips) Y 2026-10-01 2026-10-01 2026-10-01 N N N 0.0384 56218779.00 56218779.00 0.1812 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797SU2 254900HROIFWPRGM1V77 US912797SU23 U.S. Treasury Debt Y 2026-11-27 2026-11-27 2026-11-27 N N N 0.0408 11129157.09 11129157.09 0.0359 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797TM9 254900HROIFWPRGM1V77 US912797TM97 U.S. Treasury Debt Y 2027-01-21 2027-01-21 2027-01-21 N N N 0.0415 6121969.22 6121969.22 0.0197 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VG9 254900HROIFWPRGM1V77 US912797VG91 U.S. Treasury Debt Y 2026-12-10 2026-12-10 2026-12-10 N N N 0.0405 9724416.13 9724416.13 0.0313 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VK0 254900HROIFWPRGM1V77 US912797VK04 U.S. Treasury Debt Y 2026-10-06 2026-10-06 2026-10-06 N N N 0.0382 20589224.96 20589224.96 0.0664 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VL8 254900HROIFWPRGM1V77 US912797VL86 U.S. Treasury Debt Y 2026-10-13 2026-10-13 2026-10-13 N N N 0.0388 11235670.31 11235670.31 0.0362 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VN4 254900HROIFWPRGM1V77 US912797VN43 U.S. Treasury Debt Y 2026-10-27 2026-10-27 2026-10-27 N N N 0.0392 8974950.66 8974950.66 0.0289 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VU8 254900HROIFWPRGM1V77 US912797VU85 U.S. Treasury Debt Y 2027-01-28 2027-01-28 2027-01-28 N N N 0.0419 6215131.19 6215131.19 0.0200 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VY0 254900HROIFWPRGM1V77 US912797VY08 U.S. Treasury Debt Y 2026-11-24 2026-11-24 2026-11-24 N N N 0.0406 9244479.00 9244479.00 0.0298 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797WF0 254900HROIFWPRGM1V77 US912797WF00 U.S. Treasury Debt Y 2026-12-15 2026-12-15 2026-12-15 N N N 0.0404 7834933.63 7834933.63 0.0253 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797WP8 254900HROIFWPRGM1V77 US912797WP81 U.S. Treasury Debt Y 2027-01-12 2027-01-12 2027-01-12 N N N 0.0414 10774195.25 10774195.25 0.0347 N Y Y N MFS SERIES TRUST IV 2026-10-07 James Byrne James Byrne Assistant Treasurer