MRTXX — State Street Institutional Treasury Money Market Fund
Data updated: 2026-10-16
MRTXX — State Street Institutional Treasury Money Market Fund. no sales load · since 2007 · Money Market. Holdings, fees, performance and SEC filings.
MRTXX Fund Overview
MRTXX — State Street Institutional Treasury Money Market Fund is a US mutual fund managed by SSGA Funds Management, Inc., categorised as Money Market. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Adviser: SSGA Funds Management, Inc.
- Trust: State Street Institutional Investment Trust
- Category: Money Market
- Inception date: October 25, 2007
- Ticker: MRTXX
- SEC CIK: 0001107414
- SEC series ID: S000019117
- Share class ID: C000276762
- FIGI: BBG021T7DFJ0
- LEI: 549300Q3FHSMZ70NLT76
About MRTXX
State Street Institutional Treasury Money Market Fund (MRTXX) seeks a high level of current income consistent with preserving principal and liquidity while maintaining a stable $1.00 net asset value per share. It invests only in U.S. Treasury bills, notes and bonds, which are direct obligations of the U.S. government, and does so through a master-feeder structure by investing substantially all of its assets in the Treasury Portfolio.
MRTXX Holdings
Top 1 holdings of State Street Institutional Treasury Money Market Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| State Street Treasury Money Market Portfolio | 100.00% |
MRTXX Debt Constituents
No individual debt constituents are reported in State Street Institutional Treasury Money Market Fund's latest SEC N-PORT filing.
MRTXX Prospectus and SEC Filings
Official State Street Institutional Treasury Money Market Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
MRTXX Service Providers
Firms that manage, distribute, hold, administer and audit State Street Institutional Treasury Money Market Fund, as reported on SEC Form N-CEN, fiscal year ending December 31, 2025.
- Adviser: SSGA Funds Management, Inc.
- Distributor: State Street Global Advisors Funds Distributors, LLC
- Custodian: State Street Bank and Trust Company
- Transfer agent: SS&C GIDS, Inc.
- Administrator: SSGA Funds Management, Inc.
- Auditor: Ernst & Young LLP
- Securities lending agent: State Street Bank and Trust Company
Related Funds
Other Money Market funds tracked on ABC INVEST:
MRTXX: Frequently Asked Questions
Does MRTXX charge a sales load?
No. This share class (MRTXX) charges no sales load.
What are MRTXX's top holdings?
As of August 31, 2026, MRTXX held 1 positions. The largest are State Street Treasury Money Market Portfolio (100.00%). All MRTXX holdings
Who manages MRTXX and when did it launch?
MRTXX is managed by SSGA Funds Management, Inc.. It is a series of State Street Institutional Investment Trust. It launched on October 25, 2007.
Where can I find MRTXX's prospectus and SEC filings?
MRTXX's latest prospectus (497) was filed October 16, 2026. All 33 filings are linked on ABC INVEST and on SEC EDGAR (series S000019117). MRTXX SEC filings
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, and annual data from Form N-CEN.
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.