Super Investors State Street Aggregate Bond Index Fund

State Street Aggregate Bond Index Fund

State Street Institutional Investment Trust · net assets $3.37B · 1 holdings as of June 30, 2026. Monthly N-PORT disclosure: the full book, not just equities.

Financial position

Total assets: $3.37B
Total liabilities: $49.4K
Net assets: $3.37B
Assets attributable to miscellaneous securities: $0
Assets invested in controlled foreign corporations: $0
Borrowings payable within one year: $0
Payable to controlled companies within one year: $0
Payable to other affiliates within one year: $0
Other liabilities payable within one year: $0
Borrowings payable after one year: $0
Payable to controlled companies after one year: $0
Payable to other affiliates after one year: $0
Other liabilities payable after one year: $0
Payables for delayed-delivery investments: $0
Payables for standby commitments: $0
Liquidation preference of outstanding preferred stock: $0
Cash not reported in Parts C or D: $0

Monthly flows and gains

	Month 1	Month 2	Month 3
Sales	$82.9M	$213M	$293M
Reinvestment	$11M	$11.1M	$11.1M
Redemptions	$41.8M	$55.4M	$394M
Net realized gain (non-derivative)	$-2.31M	$-4.45M	$-16.4M
Net unrealized appreciation (non-derivative)	$-5.14M	$4.52M	$14.3M

The three months of the reporting period, as filed; month 3 ends June 30, 2026.

Filing details

Registrant: State Street Institutional Investment Trust
Registrant CIK: 1107414
Registrant LEI: 549300P1E098W6ES7M39
Series: State Street Aggregate Bond Index Fund
Series ID: S000010699
Series LEI: 549300XQJVU0Y07Q0R24
SEC file number: 811-09819
Address: One Congress Street, Boston, US-MA, 02114, US
Phone: (800) 647-7327
Form: NPORT-P
Filed: August 28, 2026
Report period ends: December 31, 2026
Report month ends: June 30, 2026
Accession number: 000141036826089565

Holding	Value	% of net assets
State Street Aggregate Bond Index Portfolio EC	$3.37B	100.00%

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