Metagenomi, Inc. (MGX) Ownership
MGX ownership summary
as of October 18, 2026- Institutions
- 18.5% of shares outstanding
- Insiders
- 19.02% of shares outstanding
- Shares outstanding
- 37.8M
- Float
- 25.5M shares available to trade
- Short interest
- 4.15% 1.3M shares short
- Days to cover
- 8.23 short interest down 11.1% vs prior month
- Institutions 18.53%
- Insiders 19.02%
- Other investors 62.45%
MGX top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard Capital Management, LLC | 2.85% | 1.1M | $844,917 | +19,756 (+1.9%) | June 30, 2026 |
| 2 | Renaissance Technologies Corp | 1.97% | 742K | $582,042 | −45,500 (−5.8%) | June 30, 2026 |
| 3 | Catalio Capital Management, LP | 1.40% | 529K | $414,731 | — | June 30, 2026 |
| 4 | Peapod Lane Capital LLC | 1.39% | 525K | $411,619 | +8,263 (+1.6%) | June 30, 2026 |
| 5 | Two Sigma Investments LLC | 1.36% | 514K | $402,742 | +16,934 (+3.4%) | June 30, 2026 |
| 6 | Bridgeway Capital Management, LLC | 1.06% | 400K | $313,835 | +4,500 (+1.1%) | June 30, 2026 |
| 7 | Wells Fargo & Co | 1.00% | 380K | $297,534 | +177,370 (+87.7%) | June 30, 2026 |
| 8 | Geode Capital Management, LLC | 0.76% | 289K | $226,313 | −69,535 (−19.4%) | June 30, 2026 |
| 9 | PURA VIDA INVESTMENTS, LLC | 0.70% | 264K | $207,283 | — | June 30, 2026 |
| 10 | BlackRock Inc | 0.68% | 258K | $201,983 | +27,497 (+11.9%) | June 30, 2026 |
| 11 | Vanguard Fiduciary Trust Co | 0.45% | 171K | $134,261 | +1,077 (+0.6%) | June 30, 2026 |
| 12 | Jacobs Levy Equity Management, Inc. | 0.42% | 160K | $125,440 | −222,153 (−58.1%) | June 30, 2026 |
| 13 | State Street Corp | 0.32% | 120K | $93,962 | −577 (−0.5%) | June 30, 2026 |
| 14 | Millennium Management LLC | 0.30% | 114K | $89,396 | −56,079 (−33.0%) | June 30, 2026 |
| 15 | Man Group PLC | 0.29% | 109K | $85,558 | +30,494 (+38.8%) | June 30, 2026 |
| 16 | Resolute Advisors LLC | 0.24% | 90K | $70,516 | — | June 30, 2026 |
| 17 | Marquette Asset Management Inc. | 0.19% | 72K | $56,543 | +72,121 (0.0%) | June 30, 2026 |
| 18 | Northern Trust Corp | 0.18% | 69K | $54,047 | −6,234 (−8.3%) | June 30, 2026 |
| 19 | RBF LLC | 0.17% | 64K | $50,192 | — | June 30, 2026 |
| 20 | XTX Topco Ltd | 0.15% | 56K | $43,674 | +15,125 (+37.3%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 10 holders added 373K shares and 6 cut 400K.
MGX top mutual fund and ETF holders
14 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | Vanguard MStar Total Stk Mkt Idx Invest | 1.96% | 741K | $581,263 | — | August 31, 2026 |
| 2 | Bridgeway Ultra-Small Company | 0.87% | 327K | $256,446 | — | June 30, 2026 |
| 3 | Fidelity Extended Market Index | 0.36% | 136K | $106,401 | −729 (−0.5%) | August 31, 2026 |
| 4 | iShares Micro-Cap ETF | 0.24% | 91K | $71,409 | −628 (−0.7%) | September 30, 2026 |
| 5 | Fidelity Total Market Index | 0.12% | 47K | $37,013 | — | August 31, 2026 |
| 6 | EA Bridgeway Ultra-Small Company Mkt ETF | 0.10% | 37K | $29,165 | — | September 30, 2026 |
| 7 | Fidelity Series Total Market Index | 0.10% | 36K | $28,293 | — | August 31, 2026 |
| 8 | Vanguard Balanced Index Inv | 0.06% | 21K | $16,333 | — | August 31, 2026 |
| 9 | Vanguard U.S. Eq Idx £ Acc | 0.04% | 13K | $10,499 | — | August 31, 2026 |
| 10 | Dimensional World Equity GBP Acc | 0.02% | 7,931 | $6,218 | — | August 31, 2026 |
| 11 | 1290 VT Micro Cap K | 0.02% | 6,882 | $5,395 | — | August 31, 2026 |
| 12 | Meeder Spectrum Retail | 0.01% | 5,496 | $4,309 | — | September 30, 2026 |
| 13 | Dimensional Global Small Coms USD Acc | 0.01% | 4,862 | $3,812 | — | August 31, 2026 |
| 14 | Global Core Equity UCITS ETF USD Acc | 0.00% | 4 | $3 | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
MGX insider transactions
latest 8| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-05 | Pamela Wapnick | Sell | $1.60 | 1,581 | $2,530 |
| 2025-12-05 | Brian C Thomas | Sell | $1.77 | 3,830 | $6,779 |
| 2025-12-05 | Pamela Wapnick | Sell | $1.77 | 1,576 | $2,790 |
| 2025-09-05 | Brian C Thomas | Sell | $1.81 | 2,701 | $4,889 |
| 2025-09-05 | Pamela Wapnick | Sell | $1.81 | 1,576 | $2,853 |
| 2025-06-06 | Brian C Thomas | Sell | $1.75 | 10,785 | $18,874 |
| 2025-06-06 | Pamela Wapnick | Sell | $1.75 | 1,576 | $2,758 |
| 2025-06-06 | Sarah B Noonberg | Sell | $1.75 | 5,239 | $9,168 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
MGX shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns MGX
Institutional investors own 18.5% of Metagenomi's shares and insiders 19.02%. The largest holder is Vanguard Capital Management, LLC with 2.85% of the shares (1.1M), as of June 30, 2026. Among the top 20 institutions, 10 added shares and 6 reduced their stake in the latest filings. Short interest is 4.15% of the float, or 8.23 days of average trading volume. The share count rose 1,154.0% since 2021.
Related: MGX analyst forecast, MGX key metrics. See the MGX stock overview for the latest quote and news.
MGX ownership FAQ
Who owns the most Metagenomi stock?
The largest shareholders of Metagenomi are Vanguard Capital Management, LLC (2.85%), Renaissance Technologies Corp (1.97%), Catalio Capital Management, LP (1.40%), Peapod Lane Capital LLC (1.39%), Two Sigma Investments LLC (1.36%).
What percentage of Metagenomi is owned by institutions?
Institutions hold 18.5% of Metagenomi's shares outstanding; insiders hold 19.02%.
Which funds own Metagenomi?
The largest fund holders of Metagenomi are Vanguard MStar Total Stk Mkt Idx Invest (1.96%), Bridgeway Ultra-Small Company (0.87%), Fidelity Extended Market Index (0.36%), iShares Micro-Cap ETF (0.24%), Fidelity Total Market Index (0.12%).
What is Metagenomi's short interest?
1.3M shares of Metagenomi were sold short, 4.15% of the float; at the average daily volume it would take 8.23 days to cover.
Are insiders buying or selling Metagenomi?
Of the latest 8 reported insider transactions in Metagenomi (since June 6, 2025), 0 were purchases and 8 were sales.
How many shares of Metagenomi are outstanding?
Metagenomi has 37.8M shares outstanding, of which 25.5M are in the public float.