N-MFP2 0000798244 XXXXXXXX 2019-08-31 0000798244 CQT3VZHUKW04X1YLM325 S000000762 12 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 N 25 25 33012267.70 34046708.19 43404638.82 52331457.73 53844908.20 187270327.44 187888834.88 185272026.95 185331936.49 185353352.02 0.1559 0.1604 0.2046 0.2467 0.2540 0.8843 0.8853 0.8733 0.8738 0.8744 651.74 211888127.87 211858711.06 117086.27 412415.59 211564033.48 211794040.4600 1.0000 0.0211 0.9990 0.9990 0.9990 0.9990 0.9991 C000002179 1000.00 99191521.06 99299849.4640 0.9990 0.9990 0.9990 0.9990 0.9990 799199.59 671804.86 1604913.85 1054278.45 695746.79 555334.54 1641326.12 842292.11 461907.33 900878.70 4870812.10 3657849.82 0.0133 Y For Class A during the period, MFS waived: $790 management fees; MFD waived: $20,995 12b-1 fees. C000002180 250.00 246799.96 247055.9090 0.9990 0.9989 0.9989 0.9990 0.9991 1990.67 0.00 0.00 18750.07 0.00 380.71 11689.82 7955.69 11402.43 0.00 23406.99 27086.47 0.0128 Y For Class 529B during the period, MFS waived: $2 management fees; MFD waived: $203 12b-1 fees. C000002181 250.00 6429706.13 6436720.7400 0.9990 0.9990 0.9990 0.9990 0.9990 36471.81 102590.50 92413.24 156029.22 21942.46 111024.70 15526.78 134971.41 37936.51 59620.45 182669.30 509951.92 0.0128 Y For Class 529C during the period, MFS waived: $52 management fees; MFD waived: $5,587 12b-1 fees. C000002182 1000.00 8949424.60 8959154.7240 0.9990 0.9990 0.9990 0.9990 0.9991 12067.38 184171.73 72005.82 263396.33 80120.68 20982.19 38911.71 231003.86 66655.64 66099.62 269761.23 586771.26 0.0133 Y For Class B during the period, MFS waived: $73 management fees; MFD waived: $7,722 12b-1 fees. C000002183 1000.00 19290635.15 19311578.2500 0.9990 0.9990 0.9989 0.9990 0.9991 320792.68 542216.11 204639.92 451296.65 154695.78 554222.31 205523.00 579143.38 151939.10 122841.31 746746.65 1869673.20 0.0133 Y For Class C during the period, MFS waived: $158 management fees; MFD waived: $16,748 12b-1 fees. C000002184 1.00 7668865.56 7677215.1450 0.9990 0.9990 0.9990 0.9990 0.9991 15470.63 36412.54 195700.75 45253.11 9062.22 0.83 10819.92 230865.68 12182.39 22500.02 238780.72 299206.00 0.0133 Y For Class R1 during the period, MFS waived: $63 management fees; MFD waived: $6,623 12b-1 fees. C000002186 1.00 31602096.01 31636442.6710 0.9990 0.9990 0.9990 0.9990 0.9991 68487.83 292222.78 412006.61 4985.97 485123.17 131098.96 73082.97 214112.97 161093.82 147900.70 1197716.21 501076.10 0.0133 Y For Class R2 during the period, MFS waived: $251 management fees; MFD waived: $13,350 12b-1 fees. C000002187 1.00 16451716.25 16469220.0030 0.9990 0.9990 0.9990 0.9990 0.9991 297246.86 8386.65 9631.85 462393.16 42187.69 5745.16 61403.59 194755.23 406241.03 52869.14 703558.28 722196.48 0.0133 Y For Class R3 during the period, MFS waived: $130 management fees; MFD waived: $3,456 12b-1 fees. C000002188 1.00 2673921.87 2676828.2710 0.9990 0.9990 0.9990 0.9990 0.9991 3676.35 0.00 0.00 0.00 181.79 0.00 0.00 9.06 881.83 0.00 4739.97 9.06 0.0133 Y For Class R4 during the period, MFS waived: $21 management fees. C000002189 250.00 18949244.43 18969732.7230 0.9990 0.9990 0.9990 0.9990 0.9991 263214.02 315209.23 409452.90 330396.50 191782.60 321281.02 297735.33 159339.90 374361.46 268365.82 1390691.04 1174949.42 0.0128 Y For Class 529A during the period, MFS waived: $150 management fees; MFD waived: $3,994 12b-1 fees. C000206004 1.00 54339.67 54419.1400 0.9993 0.9993 0.9993 0.9990 0.9987 22510.72 0.00 0.00 9.46 0.00 0.00 0.00 24.54 0.00 18745.96 46.18 18755.42 0.0133 N C000206005 1.00 55762.79 55823.4200 0.9990 0.9990 0.9990 0.9990 0.9991 72.59 0.00 0.00 0.00 0.00 0.00 0.00 0.18 0.00 0.00 72.59 0.18 0.0132 N BOFA Securities BOFA Securities 2.130000% 549300HN4UKV1E2R3U73 0001102113 03199T002_2.13_0903 U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash Y N U.S. Treasury Bill 254900HROIFWPRGM1V77 2024-03-31 2.125000 10866000.00 11303236.71 U.S. Treasuries (including strips) Y 2019-09-03 2019-09-03 2019-09-03 N N N 0.0213 10972000.00 10972000.00 0.0519 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312LF5 US313312LF59 U.S. Government Agency Debt Y 2019-09-03 2019-09-03 2019-09-03 N N N 0.0001 19500000.00 19500000.00 0.0922 N Y Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312LH1 US313312LH16 U.S. Government Agency Debt Y 2019-09-05 2019-09-05 2019-09-05 N N N 0.0210 10553786.18 10553786.18 0.0499 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312LW8 US313312LW82 U.S. Government Agency Debt Y 2019-09-18 2019-09-18 2019-09-18 N N N 0.0210 8492668.75 8492668.75 0.0401 N N Y N Federal Farm Credit Bank Federal Farm Credit Bank 313312MR8 US313312MR88 U.S. Government Agency Debt Y 2019-10-07 2019-10-07 2019-10-07 N N N 0.0206 4092139.40 4092139.40 0.0193 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LG2 2549001DPIFGXC1TOL40 US313384LG28 U.S. Government Agency Debt Y 2019-09-04 2019-09-04 2019-09-04 N N N 0.0210 4299752.75 4299752.75 0.0203 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LN7 2549001DPIFGXC1TOL40 US313384LN78 U.S. Government Agency Debt Y 2019-09-10 2019-09-10 2019-09-10 N N N 0.0210 5566758.48 5566758.48 0.0263 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LP2 2549001DPIFGXC1TOL40 US313384LP27 U.S. Government Agency Debt Y 2019-09-11 2019-09-11 2019-09-11 N N N 0.0210 12321329.58 12321329.58 0.0582 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LW7 2549001DPIFGXC1TOL40 US313384LW77 U.S. Government Agency Debt Y 2019-09-18 2019-09-18 2019-09-18 N N N 0.0210 6322542.10 6322542.10 0.0299 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LX5 2549001DPIFGXC1TOL40 US313384LX50 U.S. Government Agency Debt Y 2019-09-19 2019-09-19 2019-09-19 N N N 0.0210 5209203.12 5209203.12 0.0246 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384LY3 2549001DPIFGXC1TOL40 US313384LY34 U.S. Government Agency Debt Y 2019-09-20 2019-09-20 2019-09-20 N N N 0.0210 34020712.22 34020712.22 0.1608 N N Y N Federal Home Loan Bank Federal Home Loan Bank 313384ML0 2549001DPIFGXC1TOL40 US313384ML04 U.S. Government Agency Debt Y 2019-10-02 2019-10-02 2019-10-02 N N N 0.0206 8486100.12 8486100.12 0.0401 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396LG6 S6XOOCT0IEG5ABCC6L87 US313396LG65 U.S. Government Agency Debt Y 2019-09-04 2019-09-04 2019-09-04 N N N 0.0210 8769495.73 8769495.73 0.0415 N N Y N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396PE7 S6XOOCT0IEG5ABCC6L87 US313396PE71 U.S. Government Agency Debt Y 2019-11-13 2019-11-13 2019-11-13 N N N 0.0201 13366863.42 13366863.42 0.0632 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396PL1 S6XOOCT0IEG5ABCC6L87 US313396PL15 U.S. Government Agency Debt Y 2019-11-19 2019-11-19 2019-11-19 N N N 0.0201 6582148.04 6582148.04 0.0311 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396QA4 S6XOOCT0IEG5ABCC6L87 US313396QA41 U.S. Government Agency Debt Y 2019-12-03 2019-12-03 2019-12-03 N N N 0.0198 4378422.88 4378422.88 0.0207 N N N N Federal Home Loan Mortgage Corp. Federal Home Loan Mortgage Corp. 313396QB2 S6XOOCT0IEG5ABCC6L87 US313396QB24 U.S. Government Agency Debt Y 2019-12-04 2019-12-04 2019-12-04 N N N 0.0198 2189092.88 2189092.88 0.0103 N N N N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588LM5 B1V7KEBTPIMZEU4LTD58 US313588LM57 U.S. Government Agency Debt Y 2019-09-09 2019-09-09 2019-09-09 N N N 0.0210 8497067.50 8497067.50 0.0402 N N Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588LW3 B1V7KEBTPIMZEU4LTD58 US313588LW30 U.S. Government Agency Debt Y 2019-09-18 2019-09-18 2019-09-18 N N N 0.0210 3994551.73 3994551.73 0.0189 N N Y N Federal National Mortgage Assoc. Federal National Mortgage Assoc. 313588MC6 B1V7KEBTPIMZEU4LTD58 US313588MC66 U.S. Government Agency Debt Y 2019-09-24 2019-09-24 2019-09-24 N N N 0.0205 10895827.38 10895827.38 0.0515 N N Y N U.S. Treasury Bill U.S. Treasury Bill 912796RF8 254900HROIFWPRGM1V77 US912796RF81 U.S. Treasury Debt Y 2019-10-10 2019-10-10 2019-10-10 N N N 0.0203 10697964.40 10697964.40 0.0506 N Y Y N U.S. Treasury Bill U.S. Treasury Bill 912796VX4 254900HROIFWPRGM1V77 US912796VX42 U.S. Treasury Debt Y 2019-10-01 2019-10-01 2019-10-01 N N N 0.0209 12679701.21 12679701.21 0.0599 N Y Y N MFS Series Trust I 2019-09-09 /s/Kino Clark Kino Clark Assistant Treasurer