N-MFP2 0000798244 XXXXXXXX 2024-01-31 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 30 30 354013189.69 349585496.37 394707519.75 368300022.79 0.00 436530376.35 432199164.70 474935177.77 472603852.25 0.00 0.7219 0.7191 0.8076 0.7572 0.0000 0.8902 0.8891 0.9717 0.9717 0.0000 1.80 484554950.52 484565958.97 120998.76 2404615.13 482282344.40 482512021.7500 1.0000 0.0535 0.9994 0.9994 0.9994 0.9994 0.0000 C000002179 1000.00 158815802.84 158891506.1220 0.9994 0.9993 0.9994 0.9994 0.0000 2270496.28 1490700.22 2526576.58 2768838.89 2339668.36 2144529.55 1403651.43 1856979.46 0.00 0.00 8836627.01 9237581.10 0.0493 Y For Class A during the period, MFS waived: $1,753 management fees; $19,390 expense limitation; MFD waived: $33,843 12b-1 fees. C000002182 1000.00 2906296.97 2907676.4180 0.9994 0.9993 0.9994 0.9994 0.0000 12817.60 6250.51 34888.56 9000.00 5368.50 14556.16 145.85 161707.51 0.00 0.00 53220.51 191514.18 0.0493 Y For Class B during the period, MFS waived: $33 management fees; $370 expense limitation; MFD waived: $2,564 12b-1 fees. C000002183 1000.00 19225062.97 19234243.1920 0.9994 0.9993 0.9995 0.9994 0.0000 123857.32 177148.20 22673.51 645231.77 4617130.74 427904.04 26231.11 421553.94 0.00 0.00 4790867.71 1789164.29 0.0493 Y For Class C during the period, MFS waived: $192 management fees; $2,125 expense limitation; MFD waived: $14,848 12b-1 fees. C000002184 1.00 6740364.01 6743564.5390 0.9994 0.9993 0.9994 0.9994 0.0000 50837.48 48888.79 158787.53 190442.86 51786.96 38327.49 11404.86 45343.99 0.00 0.00 276513.00 329388.70 0.0493 Y For Class R1 during the period, MFS waived: $74 management fees; $821 expense limitation; MFD waived: $5,730 12b-1 fees. C000002186 1.00 17743003.94 17751118.1850 0.9994 0.9993 0.9994 0.9994 0.0000 111862.93 118338.83 23536.17 203463.73 127719.57 33904.80 43798.37 40564.38 0.00 0.00 954858.28 396769.28 0.0493 Y For Class R2 during the period, MFS waived: $188 management fees; $2,071 expense limitation; MFD waived: $7,261 12b-1 fees. C000002187 1.00 17536458.42 17544819.8410 0.9994 0.9994 0.9994 0.9994 0.0000 132984.74 143762.75 13262.61 58152.23 33980.74 282465.70 13704.94 6536.44 0.00 0.00 342646.47 719510.25 0.0493 Y For Class R3 during the period, MFS waived: $195 management fees; $2,157 expense limitation; MFD waived: $3,759 12b-1 fees. C000002188 1.00 2833010.11 2834354.7700 0.9994 0.9994 0.9994 0.9994 0.0000 11851.21 0.00 0.00 0.00 0.00 0.00 48.98 0.00 0.00 0.00 11900.19 0.00 0.0493 Y For Class R4 during the period, MFS waived: $31 management fees; $343 expense limitation. C000206004 1.00 239494609.77 239608911.4380 0.9994 0.9994 0.9994 0.9994 0.0000 1472667.31 3675375.54 181.53 3682915.40 87105.02 1711651.66 6744.58 1572190.67 0.00 0.00 1569220.86 11967485.76 0.0498 Y For Class R6 during the period, MFS waived: $2,680 management fee; $29,750 expense limitation. C000206005 1.00 16987735.37 16995827.2450 0.9994 0.9994 0.9994 0.9994 0.0000 1057018.81 14091.30 0.00 129671.62 20196.49 70272.30 29.81 115762.63 0.00 0.00 1078700.71 391965.85 0.0493 Y For Class I during the period, MFS waived: $188 management fees; $2,091 expense limitation. BOFA Securities Bank of America NA 5.300000% 549300HN4UKV1E2R3U73 0001102113 03199T002_5.30_0201 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2051-05-15 2.375000 107500000.00 74846875.00 U.S. Treasuries (including strips) Y 2024-02-01 2024-02-01 2024-02-01 N N N 0.0530 73377000.00 73377000.00 0.1521 N Y 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 0.0515 13657271.25 13657271.25 0.0283 N N N N Federal Home Loan Bank Federal Home Loan Bank 313384TR0 2549001DPIFGXC1TOL40 US313384TR01 U.S. Government Agency Debt Y 2024-02-28 2024-02-28 2024-02-28 N N N 0.0510 24002529.00 24002529.00 0.0498 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384UL1 2549001DPIFGXC1TOL40 US313384UL12 U.S. Government Agency Debt Y 2024-03-18 2024-03-18 2024-03-18 N N N 0.0518 19168344.47 19168344.47 0.0397 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396UL5 S6XOOCT0IEG5ABCC6L87 US313396UL59 U.S. Government Agency Debt Y 2024-03-18 2024-03-18 2024-03-18 N N N 0.0512 40223728.04 40223728.04 0.0834 N N 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 0.0498 20939333.31 20939333.31 0.0434 N N Y N Fixed Income Clearing Corp./State Street Bank & Trust Co. Fixed Income Clearing Corp./State Street Bank & Trust Co. 5.290000% 549300H47WTHXPU08X20 0000093748 85748R009_5.29_0201 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2029-07-31 2.625000 80303000.00 74844905.47 U.S. Treasuries (including strips) Y 2024-02-01 2024-02-01 2024-02-01 N N N 0.0529 73377278.00 73377278.00 0.1521 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 0.0500 23427928.32 23427928.32 0.0486 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 0.0515 17172937.78 17172937.78 0.0356 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 0.0000 42450000.00 42450000.00 0.0880 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 0.0492 23751520.59 23751520.59 0.0492 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JC2 254900HROIFWPRGM1V77 US912797JC26 U.S. Treasury Debt Y 2024-02-06 2024-02-06 2024-02-06 N N N 0.0440 21384514.75 21384514.75 0.0443 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JG3 254900HROIFWPRGM1V77 US912797JG30 U.S. Treasury Debt Y 2024-03-05 2024-03-05 2024-03-05 N N N 0.0513 24879842.50 24879842.50 0.0516 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 0.0511 13321684.50 13321684.50 0.0276 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912797JJ7 254900HROIFWPRGM1V77 US912797JJ78 U.S. Treasury Debt Y 2024-03-19 2024-03-19 2024-03-19 N N N 0.0516 18869349.16 18869349.16 0.0391 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 0.0521 34551688.85 34551688.85 0.0716 N Y Y N MFS Series Trust I 2024-02-07 Kino Clark Kino Clark Assistant Treasurer