N-MFP3 0000063068 XXXXXXXX 2026-06-30 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 35 35 234556005.24 285920278.95 0.7393 0.9012 2026-06-01 234217732.45 285588033.90 0.7384 0.9004 2026-06-02 234517870.61 285893323.87 0.7392 0.9011 2026-06-03 234605038.01 285985643.30 0.7393 0.9012 2026-06-04 225049265.50 276435022.45 0.7093 0.8713 2026-06-05 224676776.61 276078231.81 0.7090 0.8712 2026-06-08 224552794.88 275959816.90 0.7089 0.8712 2026-06-09 223806840.31 275219475.57 0.7082 0.8709 2026-06-10 223761198.95 275178526.70 0.7081 0.8708 2026-06-11 213910267.29 265332175.96 0.6789 0.8421 2026-06-12 213750289.59 265188074.73 0.6788 0.8421 2026-06-15 220321419.92 264315078.18 0.7016 0.8416 2026-06-16 219933723.15 263932551.35 0.7011 0.8414 2026-06-17 219718342.30 263720365.03 0.7006 0.8409 2026-06-18 219643701.12 272410434.49 0.7007 0.8691 2026-06-22 220011701.64 272783693.84 0.7011 0.8692 2026-06-23 209383597.33 262160848.26 0.6707 0.8397 2026-06-24 220057494.91 261841267.91 0.7056 0.8396 2026-06-25 219920447.33 261707698.23 0.7054 0.8394 2026-06-26 219953334.24 271197263.53 0.7054 0.8698 2026-06-29 209267300.15 270980404.07 0.6716 0.8696 2026-06-30 2.63 311505462.57 311535836.39 61393.29 938657.83 310658574.48 310659066.0640 Y 1.0000 0.0367 2026-06-01 0.0367 2026-06-02 0.0366 2026-06-03 0.0366 2026-06-04 0.0366 2026-06-05 0.0365 2026-06-08 0.0365 2026-06-09 0.0365 2026-06-10 0.0365 2026-06-11 0.0366 2026-06-12 0.0366 2026-06-15 0.0367 2026-06-16 0.0367 2026-06-17 0.0367 2026-06-18 0.0366 2026-06-22 0.0366 2026-06-23 0.0366 2026-06-24 0.0367 2026-06-25 0.0367 2026-06-26 0.0367 2026-06-29 0.0367 2026-06-30 0.9999 2026-06-01 1.0000 2026-06-02 1.0000 2026-06-03 1.0000 2026-06-04 0.9999 2026-06-05 0.9999 2026-06-08 0.9999 2026-06-09 0.9999 2026-06-10 0.9999 2026-06-11 0.9999 2026-06-12 0.9999 2026-06-15 0.9999 2026-06-16 0.9999 2026-06-17 0.9998 2026-06-18 0.9999 2026-06-22 0.9999 2026-06-23 0.9999 2026-06-24 0.9999 2026-06-25 0.9998 2026-06-26 0.9999 2026-06-29 0.9999 2026-06-30 N N A C000006517 1000.00 310658574.48 310659066.0640 0.9999 2026-06-01 1.0000 2026-06-02 1.0000 2026-06-03 1.0000 2026-06-04 0.9999 2026-06-05 0.9999 2026-06-08 0.9999 2026-06-09 0.9999 2026-06-10 0.9999 2026-06-11 0.9999 2026-06-12 0.9999 2026-06-15 0.9999 2026-06-16 0.9999 2026-06-17 0.9998 2026-06-18 0.9999 2026-06-22 0.9999 2026-06-23 0.9999 2026-06-24 0.9999 2026-06-25 0.9998 2026-06-26 0.9999 2026-06-29 0.9999 2026-06-30 965707.70 445200.47 2026-06-01 356790.44 316761.95 2026-06-02 306573.40 269380.44 2026-06-03 346791.10 300395.22 2026-06-04 504121.01 675163.46 2026-06-05 24440.26 438468.08 2026-06-08 78663.93 263183.71 2026-06-09 129108.33 860882.89 2026-06-10 213582.85 287354.45 2026-06-11 17535.84 1024577.41 2026-06-12 370971.42 658853.44 2026-06-15 96535.60 914526.82 2026-06-16 21154.73 413577.26 2026-06-17 97703.10 284027.22 2026-06-18 57776.50 268527.12 2026-06-22 536570.72 192669.87 2026-06-23 239705.95 1880883.54 2026-06-24 0.00 365717.16 2026-06-25 7866.85 187039.24 2026-06-26 314170.80 189838.60 2026-06-29 53753.89 293061.92 2026-06-30 4739524.42 10530090.27 0.0322 2026-06-01 0.0322 2026-06-02 0.0322 2026-06-03 0.0322 2026-06-04 0.0321 2026-06-05 0.0321 2026-06-08 0.0321 2026-06-09 0.0321 2026-06-10 0.0321 2026-06-11 0.0321 2026-06-12 0.0322 2026-06-15 0.0322 2026-06-16 0.0322 2026-06-17 0.0322 2026-06-18 0.0322 2026-06-22 0.0322 2026-06-23 0.0322 2026-06-24 0.0322 2026-06-25 0.0322 2026-06-26 0.0322 2026-06-29 0.0323 2026-06-30 Y 46778.00 Broker-dealer 0.0511 0.00 Broker-dealer 0.3482 0.00 N Bank of America NA Bank of America NA 3.630000% 03199T002 549300HN4UKV1E2R3U73 0001102113 03199T002_3.63_0701 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 912810TM0 2042-11-15 4.000000 0.00 55090000.00 50286840.63 U.S. Treasuries (including strips) Y 2026-07-01 2026-07-01 2026-07-01 N N N 0.0363 49175000.00 49175000.00 0.1583 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 0.0366 10463704.97 10463704.97 0.0337 N N 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 0.0369 8941040.01 8941040.01 0.0288 N N N 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 0.0369 6141613.24 6141613.24 0.0198 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 0.0366 8753477.30 8753477.30 0.0282 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 0.0369 7747304.53 7747304.53 0.0249 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 0.0371 8712031.77 8712031.77 0.0280 N N N N Federal Home Loan Bank Federal Home Loan Bank 313385ZD1 2549001DPIFGXC1TOL40 US313385ZD16 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-07-10 2026-07-10 2026-07-10 N N N 0.0361 14385559.97 14385559.97 0.0463 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313385ZL3 2549001DPIFGXC1TOL40 US313385ZL32 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-07-17 2026-07-17 2026-07-17 N N N 0.0361 9683464.22 9683464.22 0.0312 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313397ZP9 S6XOOCT0IEG5ABCC6L87 US313397ZP91 U.S. Government Agency Debt (if categorized as no-coupon discount notes) Y 2026-07-20 2026-07-20 2026-07-20 N N N 0.0361 8981949.96 8981949.96 0.0289 N N Y 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 0.0366 9444947.50 9444947.50 0.0304 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 8983071.58 8983071.58 0.0289 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_0701 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 91282CPZ8 2036-02-15 4.125000 0.00 50319200.00 50157663.29 U.S. Treasuries (including strips) Y 2026-07-01 2026-07-01 2026-07-01 N N N 0.0361 49174158.00 49174158.00 0.1583 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797RF6 254900HROIFWPRGM1V77 US912797RF64 U.S. Treasury Debt Y 2026-07-09 2026-07-09 2026-07-09 N N N 0.0368 11290897.17 11290897.17 0.0363 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 0.0388 11025369.38 11025369.38 0.0355 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797TN7 254900HROIFWPRGM1V77 US912797TN70 U.S. Treasury Debt Y 2026-07-16 2026-07-16 2026-07-16 N N N 0.0366 22665902.78 22665902.78 0.0730 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 10111578.04 10111578.04 0.0325 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797UN5 254900HROIFWPRGM1V77 US912797UN51 U.S. Treasury Debt Y 2026-07-07 2026-07-07 2026-07-07 N N N 0.0364 13991625.62 13991625.62 0.0450 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797UR6 254900HROIFWPRGM1V77 US912797UR65 U.S. Treasury Debt Y 2026-07-28 2026-07-28 2026-07-28 N N N 0.0368 11967390.72 11967390.72 0.0385 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 0.0370 6767042.64 6767042.64 0.0218 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 0.0370 5117803.90 5117803.90 0.0165 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 0.0374 6851510.53 6851510.53 0.0221 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 0.0382 11129018.74 11129018.74 0.0358 N Y Y N MFS SERIES TRUST IV 2026-07-08 James Byrne James Byrne Assistant Treasurer