N-MFP3 0001107414 XXXXXXXX 2026-10-31 STATE STREET INSTITUTIONAL INVESTMENT TRUST 0001107414 549300P1E098W6ES7M39 State Street Federal Treasury Plus Money Market Fund 984500FCIE7E84F01E90 S000086382 5 N N 333-30810 SSGA Funds Management, Inc. 801-60103 Ernst & Young LLP Boston MA SSGA Funds Management, Inc. 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