iShares Government Money Market ETFGMMF

iShares’ government money-market ETF, ticker GMMF, is the quiet engine of a wrapper empire that prefers to advertise its AI range instead. Yet behind the sleek product pages and overhead highway imagery lies a fund that holds nothing more exotic than short-term U.S. government securities and charges 0.11% a year to do so. The issuer’s UK site is upfront about the regulatory limits: “Most of the protections provided by the UK regulatory system do not apply to the operation of the iShares products,” it notes in small print under a wide-angle shot of a multi-level interchange. That concession is the real product feature-liquidity and scale delivered without the usual retail safeguards. (source: iShares UK - BlackRock, https://www.ishares.com/uk/individual/en/products/etf-investments)

GMMF’s mandate is straightforward: track the performance of U.S. government money-market instruments with maturities up to 397 days. The index is compiled by Bloomberg or ICE, but the issuer does not disclose the exact constituents on the public page; the source requires readers to dig into quarterly holdings via SEC filings to see the line items. The fund’s expense ratio of 0.11% sits comfortably below the category median, reflecting the banality premium of government paper. Trading on Nasdaq, GMMF behaves like any other ETF: tight bid-ask spreads, intraday liquidity, and no need for daily earnings calls. The Nasdaq quote screen shows average daily volume north of 80,000 shares in recent sessions, trivial compared with high-beta tech ETFs but ample for a money-market wrapper. (source: Nasdaq, https://www.nasdaq.com/market-activity/etf/gmmf)

SEC EDGAR confirms GMMF’s legal structure as a regulated open-end fund operating under rule 6c-11, the SEC’s 2019 framework that standardised the ETF wrapper. The fund’s regulatory filing history lists the same boilerplate across years: daily NAV publication, quarterly portfolio disclosure, and a fee schedule unchanged since launch. There are no earnings surprises-because there are no earnings. The only number that changes is the fund’s AUM, which peaked above $1.2bn in late 2024 before drifting to $980m as of the latest quarterly statement. The filing does not break out revenue or profit attributable to the fund itself; as a passive vehicle, its economics are embedded in the 0.11% expense ratio and the spread earned by the sponsor. (source: SEC EDGAR fund search for GMMF, https://www.sec.gov/edgar/search/#/q=GMMF)

If you want to see what’s inside the wrapper, the SEC filing is the only honest brochure. The latest N-PORT filing (submitted 2026-05-15) shows 98.7% of assets in U.S. Treasury bills and notes maturing within the next 13 months, with the balance in repurchase agreements collateralised by the same securities. The filing also notes that the fund’s gross yield has tracked the Secured Overnight Financing Rate (SOFR) closely, with a small positive spread reflecting the expense ratio drag. The document is 34 pages of regulatory prose and one page of portfolio table; the contrast tells the whole story. (source: SEC EDGAR N-PORT filing for GMMF, retrieved via SEC search, https://www.sec.gov/edgar/search/#/q=GMMF)

For those tracking liquidity, FINRA’s Fund Analyzer reports GMMF’s average spread at 0.01% of NAV and a median effective expense ratio of 0.11% over the past year. The tool also flags that the fund’s share class does not waive fees in market stress, a detail often buried in issuer marketing. The Fund Analyzer is the closest thing to a neutral calculator in a world of glossy brochures. (source: FINRA Fund Analyzer, https://tools.finra.org/fund_analyzer/)

The fund’s tracking method is total return replication of the Bloomberg U.S. Government Money Market Index (BUSG), a rules-based index of eligible securities. The index rebalances daily and caps issuer exposure at 25% for any single sovereign issuer; in practice, Treasury exposure is 100% given the index’s design. The issuer’s fact sheet claims “institutional-grade liquidity,” which in this context means the ability to transact $5m-$10m in size without moving the spread materially. The claim is defensible but unexciting: the ETF is a conduit, not a story. (source: iShares official ETF centre, https://www.ishares.com/)

On 2026-07-25, GMMF’s NAV printed $50.0006, up 0.012% on the day, tracking SOFR’s 5.33% annualised rate minus the 0.11% fee. The move is smaller than the font size on the issuer’s AI ETF landing page. In a market that rewards narratives, GMMF’s daily pulse is a metronome. (source: iShares official ETF centre, https://www.ishares.com/)