N-MFP3 0001107414 XXXXXXXX 2026-09-30 STATE STREET INSTITUTIONAL INVESTMENT TRUST 0001107414 549300P1E098W6ES7M39 State Street Federal Treasury Money Market Fund 984500C54F6C789ECD10 S000086381 5 N N 333-30810 SSGA Funds Management, Inc. 801-60103 Ernst & Young LLP Boston MA SSGA Funds Management, Inc. 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Street Treasury Money Market Portfolio FSSgAK1AX 549300N64B7W4646YW39 FSSgAK1AX Investment Company Y 2026-10-01 2026-10-01 2026-10-01 N N N 0.0000 163174355.97 163174355.97 1.0000 N Y Y N STATE STREET INSTITUTIONAL INVESTMENT TRUST 2026-10-07 /s/ Chad Hallett Chad Hallett Deputy Treasurer