# State Street Prime Money Market ETF — new fund registration

STATE STREET INSTITUTIONAL INVESTMENT TRUST registered 1 new fund series on Form 485APOS, filed 2025-10-20. Featured series: State Street Prime Money Market ETF.

## Registration

- Registrant / trust: STATE STREET INSTITUTIONAL INVESTMENT TRUST
- CIK: 0001107414
- Form: 485APOS
- Filed: 2025-10-20
- State of incorporation: MA
- Accession: 0001193125-25-243706

## Series & classes (1)

| Series | Class | Ticker | New |
| --- | --- | --- | --- |
| [State Street Prime Money Market ETF](https://search.stillhousedata.com/fund/S000100105) | State Street Prime Money Market ETF | MMK | Yes |

## Fees (from the effective prospectus)

- 12b-1 fee: 0.00%
- Gross expense ratio: 0.18%
- Management fee: 0.18%
- Other expenses: 0.00%

## Investment objective

The investment objective of the State Street Prime Money Market ETF (the Fund) is to seek to maximize current income, to the extent consistent with the preservation of capital and liquidity.

## Other filings by this registrant (15)

- [485APOS — 2026-07-01](https://search.stillhousedata.com/launch/0001193125-26-291811)
- [485APOS — 2026-04-10](https://search.stillhousedata.com/launch/0001193125-26-151377)
- [485APOS — 2025-11-21 (5 new series)](https://search.stillhousedata.com/launch/0001193125-25-290916)
- [485APOS — 2025-11-14 (2 new series)](https://search.stillhousedata.com/launch/0001193125-25-282942)
- [485APOS — 2025-04-15](https://search.stillhousedata.com/launch/0001193125-25-081544)
- [485APOS — 2025-02-28](https://search.stillhousedata.com/launch/0001193125-25-042596)
- [485APOS — 2024-06-28 (3 new series)](https://search.stillhousedata.com/launch/0001193125-24-171946)
- [485APOS — 2024-05-23 (3 new series)](https://search.stillhousedata.com/launch/0001193125-24-145807)
- [485APOS — 2023-08-11 (1 new series)](https://search.stillhousedata.com/launch/0001193125-23-210375)
- [485APOS — 2021-10-08 (1 new series)](https://search.stillhousedata.com/launch/0001193125-21-295346)
- [485APOS — 2021-09-02](https://search.stillhousedata.com/launch/0001193125-21-264586)
- [485APOS — 2021-08-27](https://search.stillhousedata.com/launch/0001193125-21-259307)

## More

- [Registrant profile: STATE STREET INSTITUTIONAL INVESTMENT TRUST](https://search.stillhousedata.com/registrant/1107414)
- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/launch/0001193125-25-243706.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.