MMK — State Street Prime Money Market ETF

Data updated: 2026-02-05

MMK — State Street Prime Money Market ETF. Money Market · 0.18% expense ratio. Holdings, fees, performance and SEC filings.

MMK Fund Overview

MMK — State Street Prime Money Market ETF is a US ETF 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.

MMK Investment Objective and Strategy

State Street Prime Money Market ETF 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 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.

Principal investment strategy

"The Fund follows a disciplined investment process in which SSGA Funds Management, Inc. ( SSGA FM?or the Adviser), the investment adviser to the Fund, bases its decisions on the relative attractiveness of different money market instruments. In the Adviser's opinion, the attractiveness of an instrument may vary depending on the general level of interest rates, as well as imbalances of supply and demand in the market. Among other things, the Adviser conducts its own credit analyses of potential investments and portfolio holdings and relies substantially on a dedicated short-term credit research team. The Fund will qualify as a money market fund?pursuant to Rule 2a-7 under the Investment Company Act of 1940, as amended ( Rule 2a-7); therefore, 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, high quality debt obligations (generally, securities that have remaining maturities of 397 calendar days or less 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 attempts to meet its investment objective by investing in a broad range of money market instruments. These may include, among other things: U.S. government securities, including U.S. Treasury bills, notes and bonds and other securities issued or guaranteed as to principal and/or interest, as applicable, by the U.S. government or its agencies or instrumentalities; certificates of deposits and time deposits of U.S. and foreign banks (including ECDs, ETDs and YCDs (as defined below)), commercial paper and other high quality obligations of U.S. or foreign companies; asset-backed securities, including asset-backed commercial paper; mortgage-related securities, including non-governmental mortgage-related securities; and repurchase agreements. These instruments may bear fixed, variable or floating rates of interest or may be zero-coupon securities.

European Certificates of Deposit ( ECDs) are U.S. dollar-denominated certificates of deposit issued by a bank outside of the United States. European Time Deposits ( ETDs) are U.S. dollar-denominated deposits in foreign branches of U.S. banks and foreign banks. Yankee Certificates of Deposit ( YCDs) are U.S. dollar-denominated certificates of deposit issued by U.S. branches of foreign banks. These instruments have different risks than those associated with the obligations of U.S. banks operating in the United States. Under normal market conditions, the Fund intends to invest more than 25% of its total assets in bank obligations. A substantial portion of the Fund may be invested in securities that are issued or traded pursuant to exemptions from registration under the federal securities laws, such as commercial paper issued in reliance on the private placement exemption from registration afforded by Section 4(a)(2) of the Securities Act of 1933, as amended (the ""1933 Act"") and securities that may be offered and sold only to ""qualified institutional buyers""?under Rule 144A of the 1933 Act."" Unlike a traditional money market fund, the Fund operates as an Exchange Traded Fund ( ETF) and will be traded on a regulated exchange.

The net asset value ( NAV) per share will not seek to maintain a stable value and is expected to fluctuate with changes in the values of the Fund's portfolio securities and reflecting changes in NAV based on creations and redemptions with Authorized Participants (as defined below). Because the share price and NAV of the Fund will fluctuate, when shares are sold (or redeemed, in the case of an Authorized Participant), they may be worth more or less than what was originally paid for them. You could lose money by investing in the Fund. The Fund is an actively managed ETF that does not seek to replicate the performance of a specified index."

MMK Costs and Fees

MMK costs about $18 per $10,000 invested per year in fund expenses.

  • Net expense ratio: 0.18%
  • Gross expense ratio: 0.18%

MMK Debt Constituents

No individual debt constituents are reported in State Street Prime Money Market ETF's latest SEC N-PORT filing.

MMK Prospectus and SEC Filings

Official State Street Prime Money Market ETF 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.