OPTXX — State Street Institutional Treasury Plus Money Market Fund

Data updated: 2026-06-24

OPTXX — State Street Institutional Treasury Plus Money Market Fund. Money Market · 0.14% expense ratio. Holdings, fees, performance and SEC filings.

OPTXX Fund Overview

OPTXX — State Street Institutional Treasury Plus Money Market Fund is a US mutual fund managed by State Street Institutional Investment Trust, categorised as Money Market. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.

OPTXX Investment Objective and Strategy

State Street Institutional Treasury Plus Money Market Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by State Street Institutional Investment Trust.

Investment objective

The investment objective of State Street Institutional Treasury Plus Money Market Fund (the Treasury Plus Fund ? or sometimes referred to in context as the Fund) is to seek a high level of current income consistent with preserving principal and liquidity and the maintenance of a stable $1.00 per share net asset value (NAV).

Principal investment strategy

The Treasury Plus Fund is a government money market fund and attempts to meet its investment objective by investing only in U.S. Treasury bills, notes and bonds (which are direct obligations of the U.S. government) and repurchase agreements collateralized by these obligations. The Fund may hold a portion of its assets in cash pending investment, to satisfy redemption requests or to meet the Fund's other cash management needs. The Fund invests in accordance with regulatory requirements applicable to money market funds, which require, among other things, the Fund to invest only in short-term securities (generally, securities that have remaining maturities of 397 calendar days or less, with the exception of certain floating rate securities that may have final maturities longer than 397 days but use maturity shortening provisions to meet the 397 day requirement, and that the Fund believes present minimal credit risk), to maintain a maximum dollar-weighted average maturity and dollar-weighted average life of sixty (60) days or less and 120 days or less, respectively, and to meet requirements as to portfolio diversification and liquidity.

The Fund seeks to achieve its investment objective by investing substantially all of its investable assets in the Treasury Plus Portfolio, which has substantially identical investment policies to the Fund. When the Fund invests in this master-feeder ? structure, the Fund's only investments are shares of the Portfolio, and it participates in the investment returns achieved by the Portfolio. Descriptions in this section of the investment activities of the Fund ? also generally describe the expected investment activities of the Portfolio.

OPTXX Costs and Fees

OPTXX costs about $14 per $10,000 invested per year in fund expenses.

  • Net expense ratio: 0.14%
  • Gross expense ratio: 0.14%

OPTXX Debt Constituents

No individual debt constituents are reported in State Street Institutional Treasury Plus Money Market Fund's latest SEC N-PORT filing.

OPTXX Prospectus and SEC Filings

Official State Street Institutional Treasury Plus Money Market Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.

Related Funds

Other Money Market funds tracked on ABC INVEST:

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, annual data from Form N-CEN, and shareholder reports from Form N-CSR.