N-MFP3 0000063068 XXXXXXXX 2026-08-31 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 33 33 225690388.19 275878100.07 0.7289 0.8910 2026-08-03 225735591.25 275930477.56 0.7289 0.8910 2026-08-04 225714806.43 275914616.01 0.7289 0.8910 2026-08-05 218174572.51 277125581.13 0.7055 0.8961 2026-08-06 217637499.86 276595229.10 0.7048 0.8958 2026-08-07 217309657.18 282746280.43 0.7045 0.9167 2026-08-10 216080411.54 281522440.37 0.7033 0.9163 2026-08-11 216658632.39 282107745.48 0.7039 0.9165 2026-08-12 216604264.18 282060025.23 0.7038 0.9165 2026-08-13 208144498.24 273606848.23 0.6758 0.8883 2026-08-14 207439178.75 291409785.18 0.6751 0.9483 2026-08-17 208352810.09 292331609.89 0.6760 0.9485 2026-08-18 207918744.35 291906037.70 0.6755 0.9484 2026-08-19 215788722.33 290984608.56 0.7032 0.9482 2026-08-20 215857119.86 291060772.36 0.7032 0.9483 2026-08-21 207407351.73 282633345.76 0.6729 0.9170 2026-08-24 216857561.64 282591596.69 0.7036 0.9169 2026-08-25 216808278.40 282550610.03 0.7036 0.9169 2026-08-26 216954420.30 282703101.11 0.7037 0.9169 2026-08-27 216865368.45 292361534.28 0.7035 0.9484 2026-08-28 217003959.95 292519678.63 0.7036 0.9485 2026-08-31 1.80 308310857.81 308330019.85 83176.27 989334.27 307423863.65 307424355.2820 Y 1.0000 0.0372 2026-08-03 0.0371 2026-08-04 0.0371 2026-08-05 0.0371 2026-08-06 0.0370 2026-08-07 0.0370 2026-08-10 0.0370 2026-08-11 0.0370 2026-08-12 0.0370 2026-08-13 0.0370 2026-08-14 0.0370 2026-08-17 0.0370 2026-08-18 0.0371 2026-08-19 0.0371 2026-08-20 0.0372 2026-08-21 0.0372 2026-08-24 0.0372 2026-08-25 0.0372 2026-08-26 0.0372 2026-08-27 0.0372 2026-08-28 0.0373 2026-08-31 0.9999 2026-08-03 1.0000 2026-08-04 1.0000 2026-08-05 1.0000 2026-08-06 0.9999 2026-08-07 1.0000 2026-08-10 1.0000 2026-08-11 1.0000 2026-08-12 1.0000 2026-08-13 0.9999 2026-08-14 1.0000 2026-08-17 1.0000 2026-08-18 1.0000 2026-08-19 1.0000 2026-08-20 0.9999 2026-08-21 1.0000 2026-08-24 1.0000 2026-08-25 1.0000 2026-08-26 1.0000 2026-08-27 0.9999 2026-08-28 0.9999 2026-08-31 N N A C000006517 1000.00 307423863.65 307424355.2820 0.9999 2026-08-03 1.0000 2026-08-04 1.0000 2026-08-05 1.0000 2026-08-06 0.9999 2026-08-07 1.0000 2026-08-10 1.0000 2026-08-11 1.0000 2026-08-12 1.0000 2026-08-13 0.9999 2026-08-14 1.0000 2026-08-17 1.0000 2026-08-18 1.0000 2026-08-19 1.0000 2026-08-20 0.9999 2026-08-21 1.0000 2026-08-24 1.0000 2026-08-25 1.0000 2026-08-26 1.0000 2026-08-27 0.9999 2026-08-28 0.9999 2026-08-31 859011.52 263631.08 2026-08-03 246911.00 219783.79 2026-08-04 192157.22 255467.27 2026-08-05 154790.52 559880.17 2026-08-06 120894.44 704427.25 2026-08-07 71794.78 439735.89 2026-08-10 39252.34 1294384.64 2026-08-11 585026.44 25291.39 2026-08-12 6350.30 86502.21 2026-08-13 394978.29 308821.32 2026-08-14 501686.39 1208366.55 2026-08-17 1561697.77 676237.76 2026-08-18 25541.76 478351.49 2026-08-19 214738.38 1170119.76 2026-08-20 282651.69 338728.62 2026-08-21 1537063.97 243752.65 2026-08-24 103745.21 167425.37 2026-08-25 50246.49 117101.05 2026-08-26 177303.47 48752.25 2026-08-27 121521.98 117388.66 2026-08-28 575232.40 477415.13 2026-08-31 7822596.36 9201564.30 0.0328 2026-08-03 0.0327 2026-08-04 0.0327 2026-08-05 0.0327 2026-08-06 0.0325 2026-08-07 0.0325 2026-08-10 0.0326 2026-08-11 0.0325 2026-08-12 0.0325 2026-08-13 0.0326 2026-08-14 0.0326 2026-08-17 0.0326 2026-08-18 0.0326 2026-08-19 0.0326 2026-08-20 0.0327 2026-08-21 0.0327 2026-08-24 0.0327 2026-08-25 0.0328 2026-08-26 0.0328 2026-08-27 0.0328 2026-08-28 0.0328 2026-08-31 Y 67359.00 Broker-dealer 0.3491 0.00 Broker-dealer 0.0516 0.00 N Bank of America NA Bank of America NA 3.650000% 03199T002 549300HN4UKV1E2R3U73 0001102113 03199T002_3.65_0901 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 91282CLF6 2034-08-15 3.875000 0.00 62638000.00 59427802.50 U.S. Treasuries (including strips) Y 2026-09-01 2026-09-01 2026-09-01 N N N 0.0365 58139000.00 58139000.00 0.1891 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 0.0361 8998193.52 8998193.52 0.0293 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 0.0361 6181332.85 6181332.85 0.0201 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 0.0377 7151054.98 7151054.98 0.0233 N N N 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 0.0387 8640126.00 8640126.00 0.0281 N N N 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 0.0361 7796868.77 7796868.77 0.0254 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 0.0371 8768258.93 8768258.93 0.0285 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 0.0371 6473875.40 6473875.40 0.0211 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 0.0371 9305675.76 9305675.76 0.0303 N N Y 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 0.0371 9208056.43 9208056.43 0.0300 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 0.0371 9041023.89 9041023.89 0.0294 N N 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 0.0371 9742433.13 9742433.13 0.0317 N N Y N Fixed Income Clearing Corp. - State Street Bank & Trust Co. Fixed Income Clearing Corp. - State Street Bank & Trust Co. 3.620000% 85748R009 549300H47WTHXPU08X20 0000093748 85748R009_3.62_0901 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 91282CNH0 2028-06-15 3.875000 0.00 59301000.00 59302698.38 U.S. Treasuries (including strips) Y 2026-09-01 2026-09-01 2026-09-01 N N N 0.0362 58139747.00 58139747.00 0.1891 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 0.0383 11098730.05 11098730.05 0.0361 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 0.0371 10176194.63 10176194.63 0.0331 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 0.0000 5150000.00 5150000.00 0.0168 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 0.0367 6895147.16 6895147.16 0.0224 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 0.0384 9697916.63 9697916.63 0.0315 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 0.0376 20526047.44 20526047.44 0.0668 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 0.0377 11201459.40 11201459.40 0.0364 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 0.0382 8947622.52 8947622.52 0.0291 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 0.0382 9218902.79 9218902.79 0.0300 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 0.0386 7813190.53 7813190.53 0.0254 N Y Y N MFS SERIES TRUST IV 2026-09-08 James Byrne James Byrne Assistant Treasurer