N-MFP2 0000798244 XXXXXXXX 2024-03-31 0000798244 549300QRB5FQ35HH3533 S000000762 9 N N 033-07638 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 31 31 340051224.51 338302498.72 372654090.38 350364039.82 349796352.88 454664482.92 453032467.35 458628501.42 454901587.38 454440662.55 0.7092 0.7080 0.7887 0.7474 0.7468 0.9483 0.9481 0.9707 0.9704 0.9702 0.68 468135544.64 468210951.70 175764.88 2380056.38 466006660.88 466236338.3490 1.0000 0.0535 0.9994 0.9994 0.9993 0.9994 0.9993 C000002179 1000.00 151903636.36 151978524.2280 0.9993 0.9994 0.9993 0.9994 0.9993 938151.44 1350841.74 577528.45 645332.10 278087.89 1867966.28 1126778.76 2401629.86 788879.06 1113355.50 3380548.11 6467728.29 0.0493 Y For Class A during the period, MFS waived: $1,686 management fees; $19,044 expense limitation; MFD waived: $32,536 12b-1 fees. C000002182 1000.00 2798177.77 2799556.0000 0.9994 0.9994 0.9993 0.9994 0.9993 11007.45 1829.47 0.00 1.16 0.00 0.00 0.00 69633.71 0.00 3407.18 11003.50 74757.82 0.0493 Y For Class B during the period, MFS waived: $31 management fees; $352 expense limitation; MFD waived: $2,407 12b-1 fees. C000002183 1000.00 15890836.28 15898685.6550 0.9994 0.9994 0.9993 0.9994 0.9993 92960.11 115093.83 153279.51 286245.09 31360.15 237512.59 117340.59 2636119.43 40643.92 105602.51 416192.76 3295418.87 0.0493 Y For Class C during the period, MFS waived: $195 management fees; $2,199 expense limitation; MFD waived: $15,009 12b-1 fees. C000002184 1.00 6872724.51 6876112.6990 0.9994 0.9994 0.9993 0.9994 0.9993 97824.89 11815.79 7087.68 32785.10 49488.17 28.47 18099.37 504.25 3860.79 18478.62 106871.01 51796.44 0.0493 Y For Class R1 during the period, MFS waived: $75 management fees; $849 expense limitation; MFD waived: $5,810 12b-1 fees. C000002186 1.00 18214781.79 18223602.8650 0.9994 0.9994 0.9993 0.9994 0.9994 199487.62 157052.69 97425.43 192095.62 64112.60 21538.72 71890.52 127491.18 319554.31 35803.85 694951.81 379512.04 0.0493 Y For Class R2 during the period, MFS waived: $198 management fees; $2,223 expense limitation; MFD waived: $7,627 12b-1 fees. C000002187 1.00 14659464.84 14666647.4090 0.9994 0.9994 0.9992 0.9994 0.9993 197895.78 44160.24 18521.64 191488.40 39589.50 2929881.15 22422.50 173606.71 61953.24 2840.00 215950.88 3298707.98 0.0493 Y For Class R3 during the period, MFS waived: $174 management fees; $1,994 expense limitation; MFD waived: $3,336 12b-1 fees. C000002188 1.00 2855890.43 2857295.3700 0.9994 0.9994 0.9993 0.9994 0.9993 11114.71 0.00 0.00 0.00 0.00 0.00 0.00 39.02 0.00 0.00 11075.69 0.00 0.0493 Y For Class R4 during the period, MFS waived: $31 management fees; $354 expense limitation. C000206004 1.00 236525405.24 236642115.4980 0.9994 0.9994 0.9993 0.9994 0.9993 1169008.09 759166.11 102267.03 890416.22 3012.25 998032.22 351593.38 557051.55 100446.10 817429.05 1502795.09 3416258.66 0.0498 Y For Class R6 during the period, MFS waived: $2,609 management fee; $29,478 expense limitation. C000206005 1.00 16285743.66 16293798.6250 0.9993 0.9993 0.9993 0.9994 0.9993 66388.00 104867.96 123.98 527833.88 296.26 220080.33 192237.56 30811.50 0.00 87979.15 259045.80 968481.06 0.0493 Y For Class I during the period, MFS waived: $180 management fees; $2,030 expense limitation. BOFA Securities Bank of America NA 5.310000% 549300HN4UKV1E2R3U73 0001102113 03199T002_5.31_0401 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2053-08-15 4.125000 64717000.00 62613697.50 U.S. Treasuries (including strips) Y 2024-04-01 2024-04-01 2024-04-01 N N N 0.0531 61004000.00 61004000.00 0.1309 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312VC1 254900C5LP6DN9OP9V83 US313312VC19 U.S. Government Agency Debt Y 2024-04-03 2024-04-03 2024-04-03 N N N 0.0177 11989640.04 11989640.04 0.0257 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312WV8 254900C5LP6DN9OP9V83 US313312WV80 U.S. Government Agency Debt Y 2024-05-14 2024-05-14 2024-05-14 N N N 0.0482 10925035.00 10925035.00 0.0234 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 0.0485 13760401.47 13760401.47 0.0295 N N N N Federal Home Loan Bank Federal Home Loan Bank 313384VZ9 2549001DPIFGXC1TOL40 US313384VZ98 U.S. Government Agency Debt Y 2024-04-24 2024-04-24 2024-04-24 N N N 0.0451 19723077.00 19723077.00 0.0423 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384WR6 2549001DPIFGXC1TOL40 US313384WR63 U.S. Government Agency Debt Y 2024-05-10 2024-05-10 2024-05-10 N N N 0.0479 18484029.00 18484029.00 0.0397 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396WH2 S6XOOCT0IEG5ABCC6L87 US313396WH20 U.S. Government Agency Debt Y 2024-05-02 2024-05-02 2024-05-02 N N N 0.0465 20047738.75 20047738.75 0.0430 N N Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588VX0 B1V7KEBTPIMZEU4LTD58 US313588VX03 U.S. Government Agency Debt Y 2024-04-22 2024-04-22 2024-04-22 N N N 0.0437 23415465.33 23415465.33 0.0502 N N Y N Fixed Income Clearing Corp./State Street Bank & Trust Co. Fixed Income Clearing Corp./State Bank & Trust Co. 5.280000% 549300H47WTHXPU08X20 0000093748 85748R009_5.28_0401 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2052-08-15 3.000000 43222400.00 33704380.60 U.S. Treasuries (including strips) U.S. Treasury Bill 254900HROIFWPRGM1V77 2027-02-28 1.875000 30563500.00 28520188.82 U.S. Treasuries (including strips) Y 2024-04-01 2024-04-01 2024-04-01 N N N 0.0528 61004412.00 61004412.00 0.1309 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797FH5 254900HROIFWPRGM1V77 US912797FH58 U.S. Treasury Debt Y 2024-05-16 2024-05-16 2024-05-16 N N N 0.0485 24836597.75 24836597.75 0.0533 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 0.0487 17314922.10 17314922.10 0.0372 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797HQ3 254900HROIFWPRGM1V77 US912797HQ30 U.S. Treasury Debt Y 2024-05-09 2024-05-09 2024-05-09 N N N 0.0476 23667631.06 23667631.06 0.0508 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797HR1 254900HROIFWPRGM1V77 US912797HR13 U.S. Treasury Debt Y 2024-05-23 2024-05-23 2024-05-23 N N N 0.0491 19749120.39 19749120.39 0.0424 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JL2 254900HROIFWPRGM1V77 US912797JL25 U.S. Treasury Debt Y 2024-04-02 2024-04-02 2024-04-02 N N N 0.0106 26096214.98 26096214.98 0.0560 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JN8 254900HROIFWPRGM1V77 US912797JN80 U.S. Treasury Debt Y 2024-04-16 2024-04-16 2024-04-16 N N N 0.0419 17262015.60 17262015.60 0.0370 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JQ1 254900HROIFWPRGM1V77 US912797JQ12 U.S. Treasury Debt Y 2024-04-30 2024-04-30 2024-04-30 N N N 0.0459 34851746.65 34851746.65 0.0748 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JV0 254900HROIFWPRGM1V77 US912797JV07 U.S. Treasury Debt Y 2024-05-07 2024-05-07 2024-05-07 N N N 0.0477 46753314.39 46753314.39 0.1003 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797KN6 254900HROIFWPRGM1V77 US912797KN61 U.S. Treasury Debt Y 2024-07-09 2024-07-09 2024-07-09 N N N 0.0510 17250183.13 17250183.13 0.0370 N Y Y N MFS Series Trust I 2024-04-05 Brian Balasco Brian Balasco Assistant Treasurer