State Street Aggregate Bond Index Fund
STATE STREET INSTITUTIONAL INVESTMENT TRUST · 3 share classes
Fund classification
Classified from what the fund holds · as of 2026 Q2
State Street Aggregate Bond Index Fund is a U.S. equity index fund that tracks the Bloomberg U.S. Aggregate Bond Index.
- Asset class
- Equity
- Region
- United States
- Management
- Index (passive)
- Fund type
- Open-end fund
- Features
- Master-feeder
Fund profile
As filed in the prospectus · 2026 Q2
The State Street Aggregate Bond Index Fund (the Aggregate Bond Index Fund ? or the Fund) seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of an index that tracks the U.S. dollar denominated investment grade bond market over the long term.
The fund tracks the Bloomberg U.S. Aggregate Bond Index using a sampling strategy, holding a subset of the index's investment-grade government, corporate, mortgage-backed, and asset-backed securities rather than all constituents. Because the fund samples the index rather than holding all securities in it, the fund's returns may diverge from the index. The fund invests substantially all its assets through a master-feeder structure in a separate portfolio with identical policies.
| Share class | Gross | Net |
|---|---|---|
| SSFCX | 0.57% | 0.47% |
| SSFEX | 0.12% | 0.03% |
| SSFDX | 0.32% | 0.22% |
Net is what a holder pays after the adviser's contractual waiver; gross is before it. A waiver can expire.
Portfolio turnover 17.00% · as of 2026 Q2
Allocation
Asset groups · long / short shown separately, never netted · 2026 Q2
| Bonds | 73.47% |
| Securitized | 25.09% |
| Cash & short-term | 3.69% |
Look-through blends 1 underlying fund; 0.0% of NAV was not looked through and stays direct-classified.
Latest quarter
What changed since the fund's previous filing
Return profile
Total return as filed — price change plus distributions reinvested · trailing figures to Apr 2026
| Share class | 1-year | 3-year | 5-year | Vol | Worst fall |
|---|---|---|---|---|---|
| -34.54% | -71.30% | -89.66% | 3.31% | -71.30% | |
| +4.05% | +10.70% | +0.70% | 3.43% | -6.12% | |
| +4.02% | +10.52% | +0.16% | 3.45% | -6.22% |
These classes hold the same portfolio, so the 90.36pp spread over 5 years is the cost difference between them — roughly 18.07pp a year — not a difference in what they own.
May 2026 and Jun 2026 have been filed since the trailing figures were struck, so they are not in the table above or the curve — every figure here shares one cut-off, which is what makes them comparable with other funds.
Holdings
By % of NAV · equity positions carry filed share counts · every resolvable issuer links to its company page
| Ticker | Issuer | %NAV | Reported price | Value | Shares |
|---|---|---|---|---|---|
| SSAFX | State Street Aggregate Bond Index PortfolioSSAFX | 100.00% | $89.08 | $3.37B | 37.9M |
Reported price is the fund's own reported value divided by its own reported shares at 2026-06-30 — not a live quote, and not what the fund paid.
Top 10 positions are 100.00% of net assets, top 25 100.00%, across 1 issuers.
See more of this fund's book
More positions with filed share counts, and the quarter-over-quarter change list rather than the largest few — free with an account, no card required.
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