Exhibit 19(b)
EX-99-906CERT
Certification pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
I, Ann M. Carpenter, President, and I, Bruce S. Rosenberg, Treasurer, of the State Street Institutional Investment Trust (the “Trust”), each certify, to the best of my knowledge and belief, that:
| 1. | This Form N-CSR filing for the Trust for the period ended June 30, 2026 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and |
| 2. | The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Trust. |
| By: | /s/ Ann M. Carpenter | |
| Ann M. Carpenter | ||
| President (Principal Executive Officer) of the State Street Institutional Investment Trust | ||
Date: September 3, 2026
| By: | /s/ Bruce S. Rosenberg | |
| Bruce S. Rosenberg | ||
| Treasurer (Principal Financial and Accounting Officer) of the State Street Institutional Investment Trust | ||
Date: September 3, 2026