Form N-MFP2 MFS SERIES TRUST I For: Nov 30

  
    N-MFP2
    
      
        
          0000798244
          XXXXXXXX
        
      
      
      
    
  
  
    
      2021-11-30
      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
      Government/Agency
      N
      46
      46
      
        203967362.02
        192618228.99
        196064442.54
        194431061.17
      
      
        245338647.66
        239641525.10
        234805662.54
        233172522.85
        0.00
      
      
        0.7951
        0.7523
        0.7752
        0.7736
      
      
        0.9564
        0.9360
        0.9284
        0.9278
        0.0000
      
      287.56
      250634476.95
      250636604.44
      102189.29
      312996.33
      250426084.96
      250625956.3950
      1.0000
      0.0004
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
    
    
      C000002179
      1000.00
      123087032.64
      123185153.8590
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        485156.86
        552419.73
      
      
        623340.68
        974195.29
      
      
        35418.22
        1918832.45
      
      
        574356.45
        955669.68
      
      
        0.00
        0.00
      
      
        1908597.39
        4768197.85
      
      0.0000
      Y
      For Class A during the period, MFS waived: $1,427 management fees; $40,108 operating expenses to avoid negative yield, $23,502 expense limitation; MFD waived: $25,621 12b-1 fees.
    
    
      C000002180
      250.00
      135749.26
      135859.5000
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        0.00
        0.00
      
      
        0.00
        0.00
      
      
        0.00
        0.00
      
      
        0.80
        5105.08
      
      
        0.00
        0.00
      
      
        0.80
        7841.97
      
      0.0000
      Y
      For Class 529B during the period, MFS waived: $2 management fees; $52 operating expenses to avoid negative yield, $27 expense limitation; MFD waived: $117 12b-1 fees.
    
    
      C000002181
      250.00
      5150711.28
      5154812.7550
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        3688.50
        46574.00
      
      
        3706.00
        24293.77
      
      
        25977.31
        38164.78
      
      
        364.66
        142512.03
      
      
        0.00
        0.00
      
      
        58886.47
        278421.06
      
      0.0000
      Y
      For Class 529C during the period, MFS waived: $60 management fees; $1,912 operating expenses to avoid negative yield, $994 expense limitation; MFD waived: $4,336 12b-1 fees.
    
    
      C000002182
      1000.00
      6034006.17
      6038847.5340
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        0.00
        3580.89
      
      
        0.00
        30150.53
      
      
        7000.00
        16027.18
      
      
        22686.34
        103667.15
      
      
        0.00
        0.00
      
      
        29686.34
        201336.60
      
      0.0000
      Y
      For Class B during the period, MFS waived: $70 management fees; $1,978 operating expenses to avoid negative yield, $1,159 expense limitation; MFD waived: $5,057 12b-1 fees.
    
    
      C000002183
      1000.00
      17789161.30
      17803307.2200
      
        0.9991
        0.9991
        0.9991
        0.9992
        0.0000
      
      
        193119.64
        249965.66
      
      
        69337.97
        556336.02
      
      
        0.00
        824134.00
      
      
        119221.28
        673514.33
      
      
        0.00
        0.00
      
      
        516389.21
        2420167.78
      
      0.0000
      Y
      For Class C during the period, MFS waived: $215 management fees; $6,058 operating expenses to avoid negative yield, $3,533 expense limitation; MFD waived: $15,409 12b-1 fees.
    
    
      C000002184
      1.00
      9184010.42
      9191325.3930
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        6255.08
        121942.90
      
      
        944.90
        73148.03
      
      
        15023.32
        0.00
      
      
        127813.16
        0.00
      
      
        0.00
        0.00
      
      
        151931.85
        202337.18
      
      0.0000
      Y
      For Class R1 during the period, MFS waived: $104 management fees; $2,931 operating expenses to avoid negative yield, $1,720 expense limitation; MFD waived: $7,497 12b-1 fees.
    
    
      C000002186
      1.00
      25509046.20
      25529530.0960
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        13324.68
        316545.69
      
      
        6369.22
        131815.24
      
      
        14269.19
        56054.33
      
      
        4913.48
        68268.16
      
      
        0.00
        0.00
      
      
        43416.98
        800859.44
      
      0.0000
      Y
      For Class R2 during the period, MFS waived: $296 management fees; $8,304 operating expenses to avoid negative yield, $4,878 expense limitation; MFD waived: $10,625 12b-1 fees.
    
    
      C000002187
      1.00
      19100759.48
      19116023.2160
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        7077.72
        1684851.34
      
      
        6383.71
        29993.01
      
      
        67061.38
        321217.57
      
      
        23573.64
        79731.51
      
      
        0.00
        0.00
      
      
        104307.97
        2190162.55
      
      0.0000
      Y
      For Class R3 during the period, MFS waived: $222 management fees; $6,232 operating expenses to avoid negative yield, $3,654 expense limitation; MFD waived: $3,985 12b-1 fees.
    
    
      C000002188
      1.00
      2675552.98
      2677682.7910
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        0.00
        0.00
      
      
        0.00
        0.00
      
      
        0.00
        0.00
      
      
        0.00
        85.76
      
      
        0.00
        0.00
      
      
        0.00
        85.76
      
      0.0000
      Y
      For Class R4 during the period, MFS waived: $31 management fees; $859 operating expenses to avoid negative yield, $504 expense limitation.
    
    
      C000002189
      250.00
      28613548.78
      28636360.3980
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        77010.25
        60595.63
      
      
        66332.92
        97102.26
      
      
        126883.87
        143678.87
      
      
        299785.29
        91001.75
      
      
        0.00
        0.00
      
      
        613870.92
        479556.44
      
      0.0000
      Y
      For Class 529A during the period, MFS waived: $326 management fees; $10,327 operating expenses to avoid negative yield, $5,375 expense limitation; MFD waived: $5,860 12b-1 fees.
    
    
      C000206004
      1.00
      112549.06
      112638.6480
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        9.77
        0.00
      
      
        9.53
        0.00
      
      
        0.00
        39.43
      
      
        15.61
        9.73
      
      
        0.00
        0.00
      
      
        34.91
        49.16
      
      0.0000
      Y
      For Class R6 during the period, MFS waived: $1 management fee; $30 operating expenses to avoid negative yield, $21 expense limitation.
    
    
      C000206005
      1.00
      13033957.39
      13044414.9850
      
        0.9992
        0.9992
        0.9992
        0.9992
        0.0000
      
      
        20.00
        64574.60
      
      
        389015.91
        19919.49
      
      
        190.00
        209086.10
      
      
        251.87
        377356.48
      
      
        0.00
        0.00
      
      
        389517.78
        774273.16
      
      0.0000
      Y
      For Class I during the period, MFS waived: $154 management fees; $4,330 operating expenses to avoid negative yield, $2,540 expense limitation.
    
    
      BOFA Securities
      Bank of America NA 0.050000%
      549300HN4UKV1E2R3U73
      0001102113
      03199T002_0.05_1201
      U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
      Y
      
        N
        
          U.S. Treasury Bill
          254900HROIFWPRGM1V77
          
            2028-05-15
          
          2.875000
          28686000.00
          31482927.87
          U.S. Treasuries (including strips)
        
      
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0005
      30865000.00
      30865000.00
      0.1232
      N
      Y
      Y
      N
    
    
      Federal Farm Credit Bank
      Federal Farm Credit Bank
      313313QD3
      US313313QD30
      U.S. Government Agency Debt
      Y
      2021-12-06
      2021-12-06
      2021-12-06
      N
      N
      N
      0.0003
      765996.81
      765996.81
      0.0031
      N
      N
      Y
      N
    
    
      Federal Farm Credit Bank
      Federal Farm Credit Bank
      313313QG6
      US313313QG60
      U.S. Government Agency Debt
      Y
      2021-12-09
      2021-12-09
      2021-12-09
      N
      N
      N
      0.0003
      10644929.00
      10644929.00
      0.0425
      N
      N
      Y
      N
    
    
      Federal Farm Credit Bank
      Federal Farm Credit Bank
      313313RU4
      US313313RU46
      U.S. Government Agency Debt
      Y
      2022-01-14
      2022-01-14
      2022-01-14
      N
      N
      N
      0.0004
      5181746.70
      5181746.70
      0.0207
      N
      N
      Y
      N
    
    
      Federal Farm Credit Bank
      Federal Farm Credit Bank
      313313SQ2
      US313313SQ25
      U.S. Government Agency Debt
      Y
      2022-02-03
      2022-02-03
      2022-02-03
      N
      N
      N
      0.0005
      1452870.89
      1452870.89
      0.0058
      N
      N
      N
      N
    
    
      Federal Farm Credit Bank
      Federal Farm Credit Bank
      313313SX7
      US313313SX75
      U.S. Government Agency Debt
      Y
      2022-02-10
      2022-02-10
      2022-02-10
      N
      N
      N
      0.0005
      6964313.39
      6964313.39
      0.0278
      N
      N
      N
      N
    
    
      Federal Home Loan Bank
      Federal Home Loan Bank
      313385QN9
      2549001DPIFGXC1TOL40
      US313385QN98
      U.S. Government Agency Debt
      Y
      2021-12-15
      2021-12-15
      2021-12-15
      N
      N
      N
      0.0003
      2987965.13
      2987965.13
      0.0119
      N
      N
      Y
      N
    
    
      Federal Home Loan Bank
      Federal Home Loan Bank
      313385SP2
      2549001DPIFGXC1TOL40
      US313385SP29
      U.S. Government Agency Debt
      Y
      2022-02-02
      2022-02-02
      2022-02-02
      N
      N
      N
      0.0005
      1475870.89
      1475870.89
      0.0059
      N
      N
      N
      N
    
    
      Federal Home Loan Bank
      Federal Home Loan Bank
      313385SR8
      2549001DPIFGXC1TOL40
      US313385SR84
      U.S. Government Agency Debt
      Y
      2022-02-04
      2022-02-04
      2022-02-04
      N
      N
      N
      0.0005
      5931464.64
      5931464.64
      0.0237
      N
      N
      N
      N
    
    
      Federal National Mortgage Assoc.
      Federal National Mortgage Assoc.
      313589PY3
      B1V7KEBTPIMZEU4LTD58
      US313589PY33
      U.S. Government Agency Debt
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0000
      13237000.00
      13237000.00
      0.0529
      N
      Y
      Y
      N
    
    
      Federal National Mortgage Assoc.
      Federal National Mortgage Assoc.
      313589QN6
      B1V7KEBTPIMZEU4LTD58
      US313589QN68
      U.S. Government Agency Debt
      Y
      2021-12-15
      2021-12-15
      2021-12-15
      N
      N
      N
      0.0003
      2993965.09
      2993965.09
      0.0120
      N
      N
      Y
      N
    
    
      Federal National Mortgage Assoc.
      Federal National Mortgage Assoc.
      313589RC9
      B1V7KEBTPIMZEU4LTD58
      US313589RC94
      U.S. Government Agency Debt
      Y
      2021-12-29
      2021-12-29
      2021-12-29
      N
      N
      N
      0.0003
      2929931.64
      2929931.64
      0.0117
      N
      N
      Y
      N
    
    
      Federal National Mortgage Assoc.
      Federal National Mortgage Assoc.
      313589SG9
      B1V7KEBTPIMZEU4LTD58
      US313589SG99
      U.S. Government Agency Debt
      Y
      2022-01-26
      2022-01-26
      2022-01-26
      N
      N
      N
      0.0004
      2219861.89
      2219861.89
      0.0089
      N
      N
      Y
      N
    
    
      JP Morgan Securities LLC
      JP Morgan Securities LLC 0.050000%
      ZBUT11V806EZRVTWT807
      0001168163
      446199002_0.05_1201
      U.S. Treasury Repurchase Agreement, if collateralized only by U.S. Treasuries (including Strips) and cash
      Y
      
        N
        
          U.S. Treasury Bill
          254900HROIFWPRGM1V77
          
            2047-11-15
          
          2.750000
          26444000.00
          31635472.93
          U.S. Treasuries (including strips)
        
      
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0005
      31015000.00
      31015000.00
      0.1238
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      9127965G0
      254900HROIFWPRGM1V77
      US9127965G05
      U.S. Treasury Debt
      Y
      2021-12-02
      2021-12-02
      2021-12-02
      N
      N
      N
      0.0003
      3705997.07
      3705997.07
      0.0148
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796D30
      254900HROIFWPRGM1V77
      US912796D308
      
      U.S. Treasury Debt
      Y
      2022-02-24
      2022-02-24
      2022-02-24
      N
      N
      N
      0.0005
      5029447.76
      5029447.76
      0.0201
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796K65
      254900HROIFWPRGM1V77
      US912796K659
      U.S. Treasury Debt
      Y
      2022-01-06
      2022-01-06
      2022-01-06
      N
      N
      N
      0.0004
      8774635.84
      8774635.84
      0.0350
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796K73
      254900HROIFWPRGM1V77
      US912796K733
      U.S. Treasury Debt
      Y
      2022-01-13
      2022-01-13
      2022-01-13
      N
      N
      N
      0.0003
      7890717.27
      7890717.27
      0.0315
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796L80
      254900HROIFWPRGM1V77
      US912796L806
      U.S. Treasury Debt
      Y
      2022-02-17
      2022-02-17
      2022-02-17
      N
      N
      N
      0.0005
      16394170.53
      16394170.53
      0.0655
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796L98
      254900HROIFWPRGM1V77
      US912796L988
      U.S. Treasury Debt
      Y
      2022-03-03
      2022-03-03
      2022-03-03
      N
      N
      N
      0.0005
      12139365.94
      12139365.94
      0.0485
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796M97
      254900HROIFWPRGM1V77
      US912796M978
      U.S. Treasury Debt
      Y
      2022-03-10
      2022-03-10
      2022-03-10
      N
      N
      N
      0.0005
      5029283.02
      5029283.02
      0.0201
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796Q51
      254900HROIFWPRGM1V77
      US912796Q516
      U.S. Treasury Debt
      Y
      2022-01-04
      2022-01-04
      2022-01-04
      N
      N
      N
      0.0006
      13473216.08
      13473216.08
      0.0538
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796Q77
      254900HROIFWPRGM1V77
      US912796Q771
      U.S. Treasury Debt
      Y
      2022-01-18
      2022-01-18
      2022-01-18
      N
      N
      N
      0.0004
      4510774.45
      4510774.45
      0.0180
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796R84
      254900HROIFWPRGM1V77
      US912796R845
      U.S. Treasury Debt
      Y
      2022-02-15
      2022-02-15
      2022-02-15
      N
      N
      N
      0.0004
      9003182.62
      9003182.62
      0.0360
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796R92
      254900HROIFWPRGM1V77
      US912796R928
      U.S. Treasury Debt
      Y
      2022-02-22
      2022-02-22
      2022-02-22
      N
      N
      N
      0.0005
      17941807.42
      17941807.42
      0.0716
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796S26
      254900HROIFWPRGM1V77
      US912796S264
      U.S. Treasury Debt
      Y
      2022-03-01
      2022-03-01
      2022-03-01
      N
      N
      N
      0.0005
      13893158.91
      13893158.91
      0.0555
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796S75
      254900HROIFWPRGM1V77
      US912796S751
      U.S. Treasury Debt
      Y
      2022-03-08
      2022-03-08
      2022-03-08
      N
      N
      N
      0.0006
      7621808.68
      7621808.68
      0.0304
      N
      Y
      Y
      N
    
    
      U.S. Treasury Bill
      U.S. Treasury Bill
      912796S83
      254900HROIFWPRGM1V77
      US912796S835
      U.S. Treasury Debt
      Y
      2022-03-15
      2022-03-15
      2022-03-15
      N
      N
      N
      0.0005
      6560995.29
      6560995.29
      0.0262
      N
      Y
      Y
      N
    
    
      MFS Series Trust I
      2021-12-07
      Kino Clark
      Kino Clark
      Assistant Treasurer
    
  

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