N-MFP3 0001107414 XXXXXXXX 2025-12-31 STATE STREET INSTITUTIONAL INVESTMENT TRUST 0001107414 549300P1E098W6ES7M39 State Street Federal Government Money Market Fund 98450099C3D5363FC713 S000086383 1 N N 333-30810 SSGA Funds Management, Inc. 801-60103 Ernst & Young LLP Boston MA SSGA Funds Management, Inc. SS&C GIDS, Inc. 0000027048 084-00448 Y 0001094885 U.S. Government Money Market Portfolio S000010686 N N Government N N 1 1 189570434837.93 191517364659.65 0.8459 0.8546 2025-12-01 188016626006.48 189463702181.58 0.8448 0.8513 2025-12-02 189034811819.33 190481965675.59 0.8455 0.8519 2025-12-03 188712066842.10 190159410579.50 0.8443 0.8508 2025-12-04 181329277809.99 182776801226.59 0.8389 0.8456 2025-12-05 181597140069.43 183401051038.83 0.8391 0.8475 2025-12-08 189230440291.48 191534406704.20 0.8427 0.8529 2025-12-09 185756379801.05 187560837729.16 0.8421 0.8503 2025-12-10 190375986149.02 193045605501.86 0.8435 0.8553 2025-12-11 191721249420.08 194276054602.09 0.8425 0.8537 2025-12-12 187963039692.65 189768244227.53 0.8427 0.8508 2025-12-15 185376338552.98 187181653575.66 0.8401 0.8483 2025-12-16 186684911228.09 188490570911.37 0.8407 0.8488 2025-12-17 184176678853.52 185982369276.28 0.8373 0.8455 2025-12-18 177352668992.23 179158561283.03 0.8319 0.8404 2025-12-19 183022182946.11 185949646455.00 0.8364 0.8497 2025-12-22 184759013901.45 187686621926.16 0.8377 0.8509 2025-12-23 180766718870.20 184194731754.29 0.8346 0.8504 2025-12-24 182995199599.81 186870744397.41 0.8362 0.8539 2025-12-26 186951656501.58 190924925275.20 0.8391 0.8569 2025-12-29 185556131306.29 189914759238.45 0.8368 0.8565 2025-12-30 189677429813.63 193087179809.97 0.8434 0.8586 2025-12-31 0.00 164407731.04 164407731.04 0.00 686389.28 163721341.76 163721161.3700 Y 1.0000 0.0405 2025-12-01 0.0405 2025-12-02 0.0405 2025-12-03 0.0404 2025-12-04 0.0400 2025-12-05 0.0399 2025-12-08 0.0398 2025-12-09 0.0398 2025-12-10 0.0397 2025-12-11 0.0390 2025-12-12 0.0389 2025-12-15 0.0387 2025-12-16 0.0385 2025-12-17 0.0384 2025-12-18 0.0384 2025-12-19 0.0383 2025-12-22 0.0383 2025-12-23 0.0383 2025-12-24 0.0384 2025-12-26 0.0384 2025-12-29 0.0385 2025-12-30 0.0386 2025-12-31 1.0002 2025-12-01 1.0002 2025-12-02 1.0002 2025-12-03 1.0002 2025-12-04 1.0002 2025-12-05 1.0002 2025-12-08 1.0002 2025-12-09 1.0003 2025-12-10 1.0003 2025-12-11 1.0003 2025-12-12 1.0003 2025-12-15 1.0003 2025-12-16 1.0003 2025-12-17 1.0003 2025-12-18 1.0003 2025-12-19 1.0003 2025-12-22 1.0003 2025-12-23 1.0003 2025-12-24 1.0003 2025-12-26 1.0003 2025-12-29 1.0003 2025-12-30 1.0002 2025-12-31 N N Advantage Class C000251886 1000000.00 163721341.76 163721161.3700 1.0002 2025-12-01 1.0002 2025-12-02 1.0002 2025-12-03 1.0002 2025-12-04 1.0002 2025-12-05 1.0002 2025-12-08 1.0002 2025-12-09 1.0003 2025-12-10 1.0003 2025-12-11 1.0003 2025-12-12 1.0003 2025-12-15 1.0003 2025-12-16 1.0003 2025-12-17 1.0003 2025-12-18 1.0003 2025-12-19 1.0003 2025-12-22 1.0003 2025-12-23 1.0003 2025-12-24 1.0003 2025-12-26 1.0003 2025-12-29 1.0003 2025-12-30 1.0002 2025-12-31 1086920.31 161634.22 2025-12-01 1250210.73 1177396.34 2025-12-02 956238.00 334370.88 2025-12-03 87623.00 425541.34 2025-12-04 666579.98 501541.43 2025-12-05 8546901.25 2477995.81 2025-12-08 1578026.08 617159.95 2025-12-09 253880.00 790281.72 2025-12-10 1505100.00 252266.21 2025-12-11 1922526.26 452126.68 2025-12-12 2270087.50 376761.92 2025-12-15 343091.67 458718.72 2025-12-16 435250.00 66181.18 2025-12-17 1131430.48 802352.40 2025-12-18 752570.00 237496.91 2025-12-19 682768.68 677293.05 2025-12-22 2004555.00 5010291.93 2025-12-23 1084600.00 453575.00 2025-12-24 127008.94 432140.89 2025-12-26 594770.39 1484920.95 2025-12-29 736400.00 1595829.03 2025-12-30 709000.00 1141179.08 2025-12-31 28725538.27 19927055.64 0.0366 2025-12-01 0.0366 2025-12-02 0.0366 2025-12-03 0.0365 2025-12-04 0.0361 2025-12-05 0.0360 2025-12-08 0.0359 2025-12-09 0.0359 2025-12-10 0.0358 2025-12-11 0.0351 2025-12-12 0.0350 2025-12-15 0.0348 2025-12-16 0.0346 2025-12-17 0.0345 2025-12-18 0.0345 2025-12-19 0.0344 2025-12-22 0.0344 2025-12-23 0.0344 2025-12-24 0.0345 2025-12-26 0.0345 2025-12-29 0.0346 2025-12-30 0.0347 2025-12-31 Y 9737.00 Broker-dealer 0.9993 0.00 N State Street U.S. Government Money Market Portfolio State Street U.S. Government Money Market Portfolio FSSgAK1AV N/A 0001094885 FSSgAK1AV Investment Company Y 2026-01-02 2026-01-02 2026-01-02 N N N 0.0000 164407731.04 164407731.04 1.0000 N Y Y N STATE STREET INSTITUTIONAL INVESTMENT TRUST 2026-01-08 /s/ Chad Hallett Chad Hallett Deputy Treasurer