N-MFP3 0000063068 XXXXXXXX 2026-07-31 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 40 40 209545858.58 271265083.18 0.6719 0.8698 2026-07-01 209304698.20 271031135.35 0.6715 0.8695 2026-07-02 209021657.96 287471071.91 0.6712 0.9231 2026-07-06 208855789.73 287313166.66 0.6710 0.9230 2026-07-07 208778459.54 287245406.90 0.6708 0.9229 2026-07-08 223107489.60 287184027.39 0.7171 0.9230 2026-07-09 222313089.88 286396159.87 0.7162 0.9227 2026-07-10 222305363.58 286405654.53 0.7162 0.9227 2026-07-13 215827908.53 279936571.14 0.6954 0.9020 2026-07-14 215435466.73 279550918.22 0.6950 0.9019 2026-07-15 224374170.21 278796441.12 0.7256 0.9016 2026-07-16 223654948.58 269085353.46 0.7228 0.8697 2026-07-17 215430725.64 260875219.26 0.6956 0.8423 2026-07-20 215337252.67 260785846.08 0.6955 0.8423 2026-07-21 215374560.47 260827383.69 0.6955 0.8422 2026-07-22 214933149.11 260389932.85 0.6950 0.8420 2026-07-23 214929640.64 260391695.42 0.6949 0.8418 2026-07-24 215764885.18 261240845.88 0.6957 0.8423 2026-07-27 216121571.86 261601385.76 0.6961 0.8425 2026-07-28 216165508.57 261649987.85 0.6961 0.8426 2026-07-29 215747167.65 261238913.23 0.6957 0.8424 2026-07-30 225897005.24 260896093.61 0.7292 0.8422 2026-07-31 1.26 309719451.80 309712386.19 61655.47 971211.33 308802831.59 308803323.2150 Y 1.0000 0.0367 2026-07-01 0.0367 2026-07-02 0.0367 2026-07-06 0.0367 2026-07-07 0.0367 2026-07-08 0.0367 2026-07-09 0.0366 2026-07-10 0.0365 2026-07-13 0.0366 2026-07-14 0.0366 2026-07-15 0.0367 2026-07-16 0.0368 2026-07-17 0.0368 2026-07-20 0.0368 2026-07-21 0.0368 2026-07-22 0.0369 2026-07-23 0.0370 2026-07-24 0.0370 2026-07-27 0.0371 2026-07-28 0.0371 2026-07-29 0.0371 2026-07-30 0.0371 2026-07-31 0.9999 2026-07-01 0.9998 2026-07-02 0.9999 2026-07-06 0.9999 2026-07-07 0.9999 2026-07-08 0.9999 2026-07-09 0.9999 2026-07-10 0.9999 2026-07-13 0.9999 2026-07-14 0.9999 2026-07-15 0.9999 2026-07-16 0.9999 2026-07-17 0.9999 2026-07-20 0.9999 2026-07-21 0.9999 2026-07-22 0.9999 2026-07-23 0.9998 2026-07-24 0.9999 2026-07-27 0.9999 2026-07-28 0.9999 2026-07-29 1.0000 2026-07-30 1.0000 2026-07-31 N N A C000006517 1000.00 308802831.59 308803323.2150 0.9999 2026-07-01 0.9998 2026-07-02 0.9999 2026-07-06 0.9999 2026-07-07 0.9999 2026-07-08 0.9999 2026-07-09 0.9999 2026-07-10 0.9999 2026-07-13 0.9999 2026-07-14 0.9999 2026-07-15 0.9999 2026-07-16 0.9999 2026-07-17 0.9999 2026-07-20 0.9999 2026-07-21 0.9999 2026-07-22 0.9999 2026-07-23 0.9998 2026-07-24 0.9999 2026-07-27 0.9999 2026-07-28 0.9999 2026-07-29 1.0000 2026-07-30 1.0000 2026-07-31 1139778.41 121459.89 2026-07-01 172343.93 406553.13 2026-07-02 1988.11 335934.54 2026-07-06 17201.48 188668.13 2026-07-07 163795.43 246708.78 2026-07-08 0.00 117053.86 2026-07-09 132274.04 971506.48 2026-07-10 24793.34 66113.76 2026-07-13 192406.11 294981.78 2026-07-14 10575.98 408568.02 2026-07-15 43403.96 914710.19 2026-07-16 643620.99 427850.34 2026-07-17 466290.15 216476.71 2026-07-20 206606.83 301497.56 2026-07-21 111099.54 101848.96 2026-07-22 25871.49 492048.39 2026-07-23 145971.95 162529.71 2026-07-24 1180970.22 388780.16 2026-07-27 500230.81 174797.33 2026-07-28 172506.61 160478.52 2026-07-29 255333.16 566887.66 2026-07-30 291279.72 688631.25 2026-07-31 5898342.26 7754085.15 0.0323 2026-07-01 0.0323 2026-07-02 0.0323 2026-07-06 0.0322 2026-07-07 0.0322 2026-07-08 0.0322 2026-07-09 0.0321 2026-07-10 0.0321 2026-07-13 0.0321 2026-07-14 0.0321 2026-07-15 0.0322 2026-07-16 0.0323 2026-07-17 0.0323 2026-07-20 0.0323 2026-07-21 0.0324 2026-07-22 0.0324 2026-07-23 0.0325 2026-07-24 0.0326 2026-07-27 0.0326 2026-07-28 0.0326 2026-07-29 0.0326 2026-07-30 0.0327 2026-07-31 Y 50413.00 Broker-dealer 0.3495 0.00 Broker-dealer 0.0512 0.00 N Bank of America NA Bank of America NA 3.630000% 03199T002 549300HN4UKV1E2R3U73 0001102113 03199T002_3.63_0803 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N N N U.S. Treasury Bond 254900HROIFWPRGM1V77 912810UT3 2046-02-15 4.625000 0.00 63058000.00 59353342.50 U.S. Treasuries (including strips) Y 2026-08-03 2026-08-03 2026-08-03 N N N 0.0363 57988000.00 57988000.00 0.1878 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313313A57 254900C5LP6DN9OP9V83 US313313A576 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-08-03 2026-08-03 2026-08-03 N N N 0.0000 10496854.41 10496854.41 0.0340 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313313E38 254900C5LP6DN9OP9V83 US313313E388 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-09-02 2026-09-02 2026-09-02 N N N 0.0365 8969887.53 8969887.53 0.0290 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313313H76 254900C5LP6DN9OP9V83 US313313H761 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-09-30 2026-09-30 2026-09-30 N N N 0.0365 6161654.74 6161654.74 0.0200 N N N N Federal Home Loan Bank Federal Home Loan Bank 313385C79 2549001DPIFGXC1TOL40 US313385C794 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-08-21 2026-08-21 2026-08-21 N N N 0.0360 8781545.70 8781545.70 0.0284 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313385E51 2549001DPIFGXC1TOL40 US313385E519 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-09-04 2026-09-04 2026-09-04 N N N 0.0365 7772320.84 7772320.84 0.0252 N N Y 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 0.0369 8740548.70 8740548.70 0.0283 N N N 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 0.0369 6453425.68 6453425.68 0.0209 N N N 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 0.0369 9276305.08 9276305.08 0.0300 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 0.0369 9178987.01 9178987.01 0.0297 N N N N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313589D42 B1V7KEBTPIMZEU4LTD58 US313589D427 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-08-26 2026-08-26 2026-08-26 N N N 0.0360 9475334.30 9475334.30 0.0307 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 0.0369 9012438.24 9012438.24 0.0292 N N N N Fixed Income Clearing Corp. - State Street Bank & Trust Co. Fixed Income Clearing Corp. - State Street Bank & Trust Co. 3.610000% 85748R009 549300H47WTHXPU08X20 0000093748 85748R009_3.61_0803 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 Bond 254900HROIFWPRGM1V77 912810SN9 2050-05-15 1.250000 0.00 23926100.00 10907834.58 U.S. Treasuries (including strips) U.S. Treasury Note 254900HROIFWPRGM1V77 91282CQX2 2031-06-30 4.125000 0.00 40022800.00 39714757.32 U.S. Treasuries (including strips) U.S. Treasury Bond 254900HROIFWPRGM1V77 912810TX6 2054-02-15 4.250000 0.00 9748700.00 8525894.92 U.S. Treasuries (including strips) Y 2026-08-03 2026-08-03 2026-08-03 N N N 0.0361 57988674.00 57988674.00 0.1878 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 0.0386 11064103.68 11064103.68 0.0358 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797UH8 254900HROIFWPRGM1V77 US912797UH83 U.S. Treasury Debt Y 2026-09-24 2026-09-24 2026-09-24 N N N 0.0376 10145687.04 10145687.04 0.0329 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797UU9 254900HROIFWPRGM1V77 US912797UU94 U.S. Treasury Debt Y 2026-08-18 2026-08-18 2026-08-18 N N N 0.0366 6789781.10 6789781.10 0.0220 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797UW5 254900HROIFWPRGM1V77 US912797UW50 U.S. Treasury Debt Y 2026-09-01 2026-09-01 2026-09-01 N N N 0.0369 5134961.28 5134961.28 0.0166 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797VB0 254900HROIFWPRGM1V77 US912797VB05 U.S. Treasury Debt Y 2026-09-08 2026-09-08 2026-09-08 N N N 0.0370 6874936.92 6874936.92 0.0223 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 0.0387 9667873.56 9667873.56 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 0.0374 20465755.16 20465755.16 0.0663 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 0.0374 11168812.24 11168812.24 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 0.0376 8921836.08 8921836.08 0.0289 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 0.0388 9189728.51 9189728.51 0.0298 N Y Y N MFS SERIES TRUST IV 2026-08-07 James Byrne James Byrne Assistant Treasurer