NPORT-P false 0001107414 XXXXXXXX S000010699 C000136670 C000136668 C000136669 STATE STREET INSTITUTIONAL INVESTMENT TRUST 811-09819 0001107414 549300P1E098W6ES7M39 One Iron Street Boston 02210 617-664-7037 State Street Aggregate Bond Index Fund S000010699 549300XQJVU0Y07Q0R24 2025-12-31 2025-06-30 N 2264856908.05 50311.77 2264806596.28 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 N State Street Aggregate Bond Index Portfolio 549300CYRPLDVB2ZTF93 85749T772 25319808.92000000 NS USD 2264856907.63000000 100.0022214413 Long EC RF US N 1 N N N 2025-07-29 STATE STREET INSTITUTIONAL INVESTMENT TRUST Arthur Jensen Arthur Jensen Deputy Treasurer