N-MFP2
    
      
        
          0001107414
          XXXXXXXX
        
      
      
      
    
  
  
    
      2021-11-30
      0001107414
      S000058519
      1
      N
      N
    
    
      333-30810
      
        SSGA Funds Management, Inc.
        801-60103
      
      
        Ernst & Young  LLP
        Boston
        MA
      
      
        SSGA Funds Management, Inc.
      
      
        DST Asset Manager Solutions, Inc.
        0000275143
        084-00896
      
      Y
      
        0001094885
        Treasury Plus Money Market Portfolio
        S000019934
      
      N
      N
      Exempt Government
      Treasury
      N
      1
      1
      
        20595165971.79
        21144254555.56
        20746446830.73
        21667366325.02
      
      
        21836165971.79
        22378254555.56
        21981446830.73
        23040366325.02
        0.00
      
      
        0.9323
        0.9342
        0.9330
        0.9321
      
      
        0.9885
        0.9887
        0.9885
        0.9912
        0.0000
      
      0.00
      3677534455.64
      3677534455.64
      0.00
      74439.72
      3677460015.92
      3677458161.6900
      1.0000
      0.0006
      
        1.0000
        1.0000
        1.0000
        1.0000
        0.0000
      
    
    
      C000192374
      1000000000.00
      3677460015.92
      3677458161.6900
      
        1.0000
        1.0000
        1.0000
        1.0000
        0.0000
      
      
        142111.61
        70947.83
      
      
        0.00
        0.00
      
      
        0.00
        0.00
      
      
        0.00
        14900000.00
      
      
        0.00
        0.00
      
      
        142111.61
        14970947.83
      
      0.0003
      Y
      SSGA Funds Management  Management Fees 114,349   State Street Global Markets Distribution Fees 54,509   SSGA Funds Management  Administration Fees 76,051
    
    
      State Street Treasury Plus Money Market Portfolio
      State Street Treasury Plus Money Market Portfolio
      FSSgAK183
      Investment Company
      Y
      2021-12-01
      2021-12-01
      2021-12-01
      N
      N
      N
      0.0000
      3677534455.64
      3677534455.64
      1.0000
      N
      Y
      Y
      N
    
    
      STATE STREET INSTITUTIONAL INVESTMENT TRUST
      2021-12-07
      /s/ Chad Hallett
      Chad Hallett
      Deputy Treasurer