N-MFP2 0000063068 XXXXXXXX 2023-12-31 0000063068 549300SSA281MOJG8J61 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 Exempt Government Government/Agency N 32 32 251563423.30 268332332.11 294028078.13 270898879.20 287347926.36 400193493.91 399302068.96 384221206.46 391164101.32 389721186.56 0.6285 0.6718 0.7317 0.6722 0.7156 0.9998 0.9998 0.9562 0.9707 0.9706 0.78 401426512.86 401454809.11 89809.40 1788333.85 399756285.44 399756929.1350 1.0000 0.0537 1.0000 0.9999 0.9999 0.9998 0.9999 C000006517 1000.00 399756285.44 399756929.1350 1.0000 0.9999 0.9999 0.9998 0.9999 6126300.10 4265206.81 3651088.73 4701554.65 6820929.79 4814118.78 9364872.36 8741581.48 3835133.17 5429229.02 27041732.85 24872778.71 0.0492 Y During the period, MFS waived: $4,387 management fees; $45,928 expense limitation. BOFA Securities Bank of America NA 5.290000% 549300HN4UKV1E2R3U73 0001102113 03199T002_5.29_0102 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2028-04-30 3.500000 43690000.00 43253100.00 U.S. Treasuries (including strips) Y 2024-01-02 2024-01-02 2024-01-02 N N N 0.0529 42405000.00 42405000.00 0.1061 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312RX0 254900C5LP6DN9OP9V83 US313312RX02 U.S. Government Agency Debt Y 2024-01-17 2024-01-17 2024-01-17 N N N 0.0443 12415765.99 12415765.99 0.0311 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312XU9 254900C5LP6DN9OP9V83 US313312XU98 U.S. Government Agency Debt Y 2024-06-06 2024-06-06 2024-06-06 N N N 0.0512 11730133.32 11730133.32 0.0293 N N N N Federal Home Loan Bank Federal Home Loan Bank 313384RX9 2549001DPIFGXC1TOL40 US313384RX96 U.S. Government Agency Debt Y 2024-01-17 2024-01-17 2024-01-17 N N N 0.0445 15457379.34 15457379.34 0.0387 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384SC4 2549001DPIFGXC1TOL40 US313384SC41 U.S. Government Agency Debt Y 2024-01-22 2024-01-22 2024-01-22 N N N 0.0463 23916640.08 23916640.08 0.0598 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396RH8 S6XOOCT0IEG5ABCC6L87 US313396RH84 U.S. Government Agency Debt Y 2024-01-03 2024-01-03 2024-01-03 N N N 0.0210 32976120.87 32976120.87 0.0825 N N Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588RG2 B1V7KEBTPIMZEU4LTD58 US313588RG26 U.S. Government Agency Debt Y 2024-01-02 2024-01-02 2024-01-02 N N N 0.0000 17989579.98 17989579.98 0.0450 N Y Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588TH8 B1V7KEBTPIMZEU4LTD58 US313588TH80 U.S. Government Agency Debt Y 2024-02-20 2024-02-20 2024-02-20 N N N 0.0497 17562672.60 17562672.60 0.0439 N N Y N Fixed Income Clearing Corp./State Street Bank & Trust Co. Fixed Income Clearing Corp./State Street Bank & Trust Co. 5.310000% 549300H47WTHXPU08X20 0000093748 85748R009_5.31_0102 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2030-01-15 0.125000 6580600.00 7172155.67 U.S. Treasuries (including strips) U.S. Treasury Bill 254900HROIFWPRGM1V77 2026-09-15 4.625000 35100300.00 36082750.03 U.S. Treasuries (including strips) Y 2024-01-02 2024-01-02 2024-01-02 N N N 0.0531 42406745.00 42406745.00 0.1061 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912796Z28 254900HROIFWPRGM1V77 US912796Z285 U.S. Treasury Debt Y 2024-02-22 2024-02-22 2024-02-22 N N N 0.0497 21935713.46 21935713.46 0.0549 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797FS1 254900HROIFWPRGM1V77 US912797FS14 U.S. Treasury Debt Y 2024-06-13 2024-06-13 2024-06-13 N N N 0.0511 15634074.08 15634074.08 0.0391 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797GE1 254900HROIFWPRGM1V77 US912797GE19 U.S. Treasury Debt Y 2024-02-01 2024-02-01 2024-02-01 N N N 0.0483 38081914.97 38081914.97 0.0953 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797GN1 254900HROIFWPRGM1V77 US912797GN18 U.S. Treasury Debt Y 2024-02-15 2024-02-15 2024-02-15 N N N 0.0496 18679573.40 18679573.40 0.0467 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797HX8 254900HROIFWPRGM1V77 US912797HX80 U.S. Treasury Debt Y 2024-01-02 2024-01-02 2024-01-02 N N N 0.0000 22000000.00 22000000.00 0.0550 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797HZ3 254900HROIFWPRGM1V77 US912797HZ39 U.S. Treasury Debt Y 2024-01-16 2024-01-16 2024-01-16 N N N 0.0441 28541525.01 28541525.01 0.0714 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JA6 254900HROIFWPRGM1V77 US912797JA69 U.S. Treasury Debt Y 2024-01-23 2024-01-23 2024-01-23 N N N 0.0467 27913950.68 27913950.68 0.0698 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JH1 254900HROIFWPRGM1V77 US912797JH13 U.S. Treasury Debt Y 2024-03-12 2024-03-12 2024-03-12 N N N 0.0505 11779724.08 11779724.08 0.0295 N Y Y N MFS SERIES TRUST IV 2024-01-08 Kasey L. Phillips Kasey L. Phillips Assistant Treasurer