NPORT-P false 0001107414 XXXXXXXX S000050331 C000158901 C000158902 C000158903 STATE STREET INSTITUTIONAL INVESTMENT TRUST 811-09819 0001107414 549300P1E098W6ES7M39 One Congress Street Boston 02114 (800) 647-7327 STATE STREET SMALL/MID CAP EQUITY INDEX FUND S000050331 54930090OO78X0U66F30 2026-12-31 2026-06-30 N 926528785.61 91561.99 926437223.62 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 Small/Mid Cap Equity Index Portfolio 54930001FXUIVS800B48 85749T707 2368366.83000000 NS USD 926528785.61000000 100.0098832373 Long EC RF US N 1 N N N 2026-07-20 STATE STREET INSTITUTIONAL INVESTMENT TRUST Arthur Jensen Arthur Jensen Deputy Treasurer