Who owns Metagenomi, Inc. Common Stock (MGX)
Which tracked institutional funds hold MGX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MGX company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-15). 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
2 tracked funds added or opened MGX while 3 trimmed or exited it between 2025-Q4 and 2026-Q1 — 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
MGX’s largest tracked holder by dollar value, VANGUARD GROUP INC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp gap the other way — the median holder sizes MGX more heavily than its largest holder by dollar value does.
Book-share is each fund’s reported value in MGX 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 2025-Q4 and 2026-Q1, across 49 tracked filers holding MGX, 15 increased or opened the position and 28 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
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 MGX between the 2025-Q4 and 2026-Q1 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 2
- VANGUARD CAPITAL MANAGEMENT LLC$1M
- JACOBS LEVY EQUITY MANAGEMENT, INC$512K
Full exits 1
- VANGUARD GROUP INC$2M
Largest trims
- JANE STREET GROUP, LLC$500K
- CITADEL ADVISORS LLC$266K
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 |
|---|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC new | 1,057,944 | $1M | 8.7% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC added | 787,900 | $1M | 6.4% | 2026-Q1 |
| Catalio Capital Management, LP | 528,993 | $709K | 4.3% | 2026-Q1 |
| Peapod Lane Capital LLC added | 516,761 | $683K | 4.2% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 496,767 | $666K | 4.1% | 2026-Q1 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC | 395,800 | $530K | 3.2% | 2026-Q1 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 382,153 | $512K | 3.1% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC added | 358,200 | $480K | 2.9% | 2026-Q1 |
| PURA VIDA INVESTMENTS, LLC | 264,391 | $354K | 2.2% | 2026-Q1 |
| NORGES BANK trimmed | 252,310 | $343K | 2.1% | 2026-Q1 |
| BlackRock, Inc. added | 230,134 | $308K | 1.9% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN added | 202,138 | $271K | 1.7% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 170,174 | $228K | 1.4% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC trimmed | 170,104 | $228K | 1.4% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 151,440 | $203K | 1.2% | 2026-Q1 |
| STATE STREET CORP | 120,427 | $161K | 1.0% | 2026-Q1 |
| Resolute Advisors LLC | 89,944 | $121K | 0.7% | 2026-Q1 |
| Man Group plc added | 78,636 | $105K | 0.6% | 2026-Q1 |
| NORTHERN TRUST CORP | 75,172 | $101K | 0.6% | 2026-Q1 |
| RBF Capital, LLC | 64,021 | $86K | 0.5% | 2026-Q1 |
| BBR PARTNERS, LLC | 53,403 | $72K | 0.4% | 2026-Q1 |
| XTX Topco Ltd trimmed | 40,582 | $54K | 0.3% | 2026-Q1 |
| Fortitude Advisory Group L.L.C. trimmed | 37,190 | $50K | 0.3% | 2026-Q1 |
| MORGAN STANLEY trimmed | 27,566 | $37K | 0.2% | 2026-Q1 |
| MARSHALL WACE, LLP trimmed | 27,521 | $37K | 0.2% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 16,993 | $23K | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 16,834 | $23K | 0.1% | 2026-Q1 |
| UBS Group AG trimmed | 16,098 | $22K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 13,392 | $18K | 0.1% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP trimmed | 12,797 | $17K | 0.1% | 2026-Q1 |
| Peak Planning Group, LLC | 12,500 | $17K | 0.1% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 11,726 | $16K | 0.1% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 10,674 | $14K | 0.1% | 2026-Q1 |
| MEEDER ASSET MANAGEMENT INC | 5,496 | $7K | 0.0% | 2026-Q1 |
| FMR LLC trimmed | 4,718 | $6K | 0.0% | 2026-Q1 |
| US BANCORP \DE\ | 4,500 | $6K | 0.0% | 2026-Q1 |
| Russell Investments Group, Ltd. trimmed | 4,179 | $6K | 0.0% | 2026-Q1 |
| OSAIC HOLDINGS, INC. | 2,891 | $4K | 0.0% | 2026-Q1 |
| JPMORGAN CHASE & CO | 1,596 | $2K | 0.0% | 2026-Q1 |
| NISA INVESTMENT ADVISORS, LLC | 511 | $685 | 0.0% | 2026-Q1 |
| Allworth Financial LP | 500 | $670 | 0.0% | 2026-Q1 |
| JONES FINANCIAL COMPANIES LLLP | 500 | $660 | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC added | 1,270,246 | $2M | 12.6% | 2025-Q4 stale |
| Sozo Ventures GP II, L.P. | 581,577 | $1M | 8.1% | 2025-Q3 stale |
| PFM Health Sciences, LP | 885,803 | $1M | 7.4% | 2025-Q1 stale |
| TWO SIGMA ADVISERS, LP added | 201,300 | $326K | 2.0% | 2025-Q4 stale |
| Good Life Advisors, LLC added | 200,000 | $296K | 1.8% | 2025-Q2 stale |
| HHLR ADVISORS, LTD. trimmed | 150,699 | $205K | 1.3% | 2025-Q1 stale |
| AQR CAPITAL MANAGEMENT LLC added | 129,055 | $191K | 1.2% | 2025-Q2 stale |
| Walleye Capital LLC new | 71,266 | $169K | 1.0% | 2025-Q3 stale |
| GOLDMAN SACHS GROUP INC added | 108,596 | $161K | 1.0% | 2025-Q2 stale |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 72,587 | $107K | 0.7% | 2025-Q2 stale |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 64,875 | $105K | 0.6% | 2025-Q4 stale |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 65,753 | $89K | 0.5% | 2025-Q1 stale |
| Nuveen, LLC new | 63,248 | $86K | 0.5% | 2025-Q1 stale |
| Bank of New York Mellon Corp added | 50,387 | $69K | 0.4% | 2025-Q1 stale |
| Diametric Capital, LP added | 49,285 | $67K | 0.4% | 2025-Q1 stale |
| TANG CAPITAL MANAGEMENT LLC trimmed | 28,008 | $66K | 0.4% | 2025-Q3 stale |
| Quadrature Capital Ltd added | 33,917 | $55K | 0.3% | 2025-Q4 stale |
| PANAGORA ASSET MANAGEMENT INC new | 32,580 | $53K | 0.3% | 2025-Q4 stale |
| Jain Global LLC new | 28,645 | $42K | 0.3% | 2025-Q2 stale |
| Dynamic Technology Lab Private Ltd trimmed | 23,762 | $38K | 0.2% | 2025-Q4 stale |
| SEI INVESTMENTS CO | 27,751 | $38K | 0.2% | 2025-Q1 stale |
| BROWN ADVISORY INC | 25,006 | $37K | 0.2% | 2025-Q2 stale |
| PRELUDE CAPITAL MANAGEMENT, LLC trimmed | 25,556 | $35K | 0.2% | 2025-Q1 stale |
| Marex Group plc | 15,000 | $34K | 0.2% | 2025-Q3 stale |
| Green Alpha Advisors, LLC trimmed | 14,252 | $34K | 0.2% | 2025-Q3 stale |
| Pinnacle Wealth Planning Services, Inc. trimmed | 24,583 | $33K | 0.2% | 2025-Q1 stale |
| INTECH INVESTMENT MANAGEMENT LLC new | 23,200 | $32K | 0.2% | 2025-Q1 stale |
| Virtu Financial LLC trimmed | 19,008 | $28K | 0.2% | 2025-Q2 stale |
| SG Americas Securities, LLC trimmed | 18,711 | $28K | 0.2% | 2025-Q2 stale |
| Vanguard Personalized Indexing Management, LLC trimmed | 16,298 | $26K | 0.2% | 2025-Q4 stale |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 15,895 | $22K | 0.1% | 2025-Q1 stale |
| RHUMBLINE ADVISERS added | 15,399 | $21K | 0.1% | 2025-Q1 stale |
| Verition Fund Management LLC trimmed | 13,892 | $21K | 0.1% | 2025-Q2 stale |
| PRUDENTIAL FINANCIAL INC trimmed | 13,400 | $20K | 0.1% | 2025-Q2 stale |
| TWO SIGMA SECURITIES, LLC trimmed | 11,700 | $19K | 0.1% | 2025-Q4 stale |
| NEW YORK STATE COMMON RETIREMENT FUND | 13,900 | $19K | 0.1% | 2025-Q1 stale |
| Catalyst Funds Management Pty Ltd new | 12,700 | $19K | 0.1% | 2025-Q2 stale |
| Pathstone Holdings, LLC | 13,648 | $19K | 0.1% | 2025-Q1 stale |
| BANK OF MONTREAL /CAN/ | 13,441 | $18K | 0.1% | 2025-Q1 stale |
| Corebridge Financial, Inc. trimmed | 13,403 | $18K | 0.1% | 2025-Q1 stale |
| Ground Swell Capital, LLC new | 12,198 | $18K | 0.1% | 2025-Q2 stale |
| Cubist Systematic Strategies, LLC added | 7,461 | $18K | 0.1% | 2025-Q3 stale |
| Squarepoint Ops LLC trimmed | 10,594 | $17K | 0.1% | 2025-Q4 stale |
| THOROUGHBRED FINANCIAL SERVICES, LLC new | 12,500 | $17K | 0.1% | 2025-Q1 stale |
| PRICE T ROWE ASSOCIATES INC /MD/ | 10,755 | $15K | 0.1% | 2025-Q1 stale |
| Mariner, LLC new | 10,939 | $15K | 0.1% | 2025-Q1 stale |
| Point72 Asia (Singapore) Pte. Ltd. trimmed | 4,922 | $12K | 0.1% | 2025-Q3 stale |
| Spire Wealth Management | 6,500 | $10K | 0.1% | 2025-Q2 stale |
| DEUTSCHE BANK AG\ trimmed | 5,349 | $8K | 0.0% | 2025-Q2 stale |
| CITIGROUP INC trimmed | 3,314 | $8K | 0.0% | 2025-Q3 stale |
| Legal & General Group Plc | 2,701 | $4K | 0.0% | 2025-Q1 stale |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM | 2,060 | $3K | 0.0% | 2025-Q1 stale |
| Physician Wealth Advisors, Inc. | 610 | $1K | 0.0% | 2025-Q3 stale |
| PRINCIPAL SECURITIES, INC. trimmed | 544 | $1K | 0.0% | 2025-Q3 stale |
| AMALGAMATED BANK added | 944 | $1K | 0.0% | 2025-Q1 stale |
| MassMutual Private Wealth & Trust, FSB | 593 | $961 | 0.0% | 2025-Q4 stale |
| Ameritas Investment Partners, Inc. | 618 | $840 | 0.0% | 2025-Q1 stale |
| Rialto Wealth Management, LLC | 305 | $723 | 0.0% | 2025-Q3 stale |
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.