Who owns GMMF
Which tracked institutional funds hold GMMF, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See GMMF company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-14). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
7 tracked funds added or opened GMMF while 3 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
GMMF’s largest tracked holder by dollar value, MRWM Advisors, LLC, sizes it at 17.5% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 17.5pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in GMMF divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 17 tracked filers holding GMMF, 10 increased or opened the position and 6 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in GMMF between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 5
- MRWM Advisors, LLC$43M
- Tower Research Capital LLC (TRC)$2M
- GOLDMAN SACHS GROUP INC$966K
- SAPIENT CAPITAL LLC$775K
- Cypress Capital, LLC$518K
Full exits 1
- Cambridge Investment Research Advisors, Inc.$2M
Largest adds
- CITADEL ADVISORS LLC$2M
- ROYAL BANK OF CANADA$440K
Largest trims
- JANE STREET GROUP, LLC$418K
- THURSTON, SPRINGER, MILLER, HERD & TITAK, INC.$331K
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| MRWM Advisors, LLC new | 424,326 | $43M | 51.3% | 2026-Q2 |
| BlackRock, Inc. | 250,000 | $25M | 30.3% | 2026-Q2 |
| Hummer Financial Advisory Services Inc trimmed | 31,000 | $3M | 3.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 27,109 | $3M | 3.3% | 2026-Q2 |
| Tower Research Capital LLC (TRC) trimmed | 24,078 | $2M | 2.9% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC new | 9,625 | $966K | 1.2% | 2026-Q2 |
| SAPIENT CAPITAL LLC new | 7,730 | $775K | 0.9% | 2026-Q2 |
| Cypress Capital, LLC new | 5,163 | $518K | 0.6% | 2026-Q2 |
| JANE STREET GROUP, LLC trimmed | 4,998 | $501K | 0.6% | 2026-Q2 |
| ROYAL BANK OF CANADA added | 4,394 | $441K | 0.5% | 2026-Q2 |
| NORTHCAPE WEALTH MANAGEMENT, LLC trimmed | 4,000 | $401K | 0.5% | 2026-Q2 |
| THURSTON, SPRINGER, MILLER, HERD & TITAK, INC. trimmed | 3,659 | $367K | 0.4% | 2026-Q2 |
| SEARLE & CO. | 3,000 | $301K | 0.4% | 2026-Q2 |
| Cetera Investment Advisers new | 2,870 | $288K | 0.3% | 2026-Q2 |
| NATIONAL BANK OF CANADA /FI/ new | 1,648 | $165K | 0.2% | 2026-Q2 |
| HARBOUR INVESTMENTS, INC. new | 199 | $20K | 0.0% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN | 1 | $60 | 0.0% | 2026-Q2 |
| Cambridge Investment Research Advisors, Inc. new | 16,407 | $2M | 2.0% | 2026-Q1 stale (1 quarter behind) |
| Granite Bay Wealth Management, LLC new | 3,954 | $398K | 0.5% | 2026-Q1 stale (1 quarter behind) |
| FLOW TRADERS U.S. LLC | 2,182 | $219K | 0.3% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.