NPORT-P false 0001107414 XXXXXXXX S000010695 C000029581 C000029582 C000029583 C000136665 C000136666 C000136667 STATE STREET INSTITUTIONAL INVESTMENT TRUST 811-09819 0001107414 549300P1E098W6ES7M39 One Congress Street Boston 02114 (800) 647-7327 State Street Equity 500 Index Fund S000010695 549300H1RTP6FLZEZA60 2026-12-31 2026-03-31 N 13535152851.97 133026.48 13535019825.49 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 Equity 500 Index II Portfolio 549300IDK82VZN2AFK60 85749T756 22970901.54000000 NS USD 13535144311.47000000 100.0009197325 Long EC RF US N 1 N N N 2026-04-30 STATE STREET INSTITUTIONAL INVESTMENT TRUST Arthur Jensen Arthur Jensen Deputy Treasurer XXXX