N-MFP2
    
      
        
          0000063068
          XXXXXXXX
        
      
      
      
    
  
  
    
      2021-11-30
      0000063068
      MQMNIX2D6ZVLO9HEKW73
      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
      45
      45
      
        273950319.37
        257017830.57
        262952125.38
        262602313.02
      
      
        328246376.63
        318177904.12
        313511097.48
        313161600.83
        0.00
      
      
        0.7978
        0.7556
        0.7767
        0.7766
      
      
        0.9559
        0.9354
        0.9261
        0.9261
        0.0000
      
      380.92
      339007092.84
      339009986.28
      67105.15
      80755.86
      338996716.49
      338962395.7820
      1.0000
      0.0004
      
        1.0001
        1.0001
        1.0001
        1.0001
        0.0000
      
    
    
      C000006517
      1000.00
      338996716.49
      338962395.7820
      
        1.0001
        1.0001
        1.0001
        1.0001
        0.0000
      
      
        1199107.96
        3960720.30
      
      
        733378.82
        3214805.58
      
      
        837196.34
        2317817.69
      
      
        1106080.59
        2129538.69
      
      
        0.00
        0.00
      
      
        6207937.70
        12372414.72
      
      0.0000
      Y
      During the period, MFS waived: $3,891 management fees; $112,730 operating expenses to avoid negative yield, $35,533 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
          40012000.00
          43913229.79
          U.S. Treasuries (including strips)
        
      
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0005
      43052000.00
      43052000.00
      0.1270
      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
      1046995.63
      1046995.63
      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
      13769908.15
      13769908.15
      0.0406
      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
      6787668.20
      6787668.20
      0.0200
      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
      2034819.17
      2034819.17
      0.0060
      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
      9859028.00
      9859028.00
      0.0291
      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
      4073952.46
      4073952.46
      0.0120
      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
      2003824.71
      2003824.71
      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
      8050273.40
      8050273.40
      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
      16803000.00
      16803000.00
      0.0496
      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
      3997953.38
      3997953.38
      0.0118
      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
      4079904.81
      4079904.81
      0.0120
      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
      3011812.62
      3011812.62
      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
          
            2042-02-15
          
          1.924157
          30002900.00
          20592670.43
          U.S. Treasuries (including strips)
        
        
          U.S. Treasury Bill
          254900HROIFWPRGM1V77
          
            2045-11-15
          
          3.000000
          19156200.00
          23530596.69
          U.S. Treasuries (including strips)
        
      
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0005
      43258000.00
      43258000.00
      0.1276
      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
      5107995.96
      5107995.96
      0.0151
      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
      6862246.51
      6862246.51
      0.0202
      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
      12175494.70
      12175494.70
      0.0359
      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
      10767614.18
      10767614.18
      0.0318
      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
      22588479.30
      22588479.30
      0.0666
      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
      15723883.44
      15723883.44
      0.0464
      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
      7361950.48
      7361950.48
      0.0217
      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
      18482924.60
      18482924.60
      0.0545
      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
      5584720.75
      5584720.75
      0.0165
      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
      10534043.63
      10534043.63
      0.0311
      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
      23623113.14
      23623113.14
      0.0697
      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
      18921492.57
      18921492.57
      0.0558
      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
      9276550.03
      9276550.03
      0.0274
      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
      10167443.02
      10167443.02
      0.0300
      N
      Y
      Y
      N
    
    
      MFS SERIES TRUST IV
      2021-12-07
      Kasey L. Phillips
      Kasey L. Phillips
      Assistant Treasurer