Who owns MeiraGTx Holdings (MGTX)
Which tracked institutional funds hold MGTX, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MGTX company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 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
The tracked-fund tape on MGTX is one-sided between 2026-Q1 and 2026-Q2: 73 added or opened and 6 trimmed or exited — on balance accumulating.
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
MGTX’s largest tracked holder by dollar value, Sanofi, sizes it at 30.9% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 30.9pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MGTX 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 155 tracked filers holding MGTX, 118 increased or opened the position and 39 reduced or closed it; over the same quarter, open-market insider Form 4s were net sales.
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 MGTX 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 13
- HEIGHTS CAPITAL MANAGEMENT, INC$11M
- Jupiter Topco LLC$6M
- PFM Health Sciences, LP$6M
- PANAGORA ASSET MANAGEMENT INC$5M
- Ghisallo Capital Management LLC$3M
- Y-Intercept (Hong Kong) Ltd$2M
Full exits 4
- Logos Global Management LP$6M
- Jefferies Financial Group Inc.$1M
- JANE STREET GROUP, LLC$917K
- PLATINUM INVESTMENT MANAGEMENT LTD$813K
Largest adds
- Rubric Capital Management LP$62M
- Sanofi$59M
- PERCEPTIVE ADVISORS LLC$56M
- BlackRock, Inc.$37M
- JOHNSON & JOHNSON$32M
- Opaleye Management Inc.$30M
Largest trims
- Prosight Management, LP$22M
- BNP PARIBAS FINANCIAL MARKETS$804K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Sanofi | 12,197,737 | $165M | 15.5% | 2026-Q2 |
| PERCEPTIVE ADVISORS LLC added | 10,786,658 | $146M | 13.7% | 2026-Q2 |
| Rubric Capital Management LP added | 9,100,000 | $123M | 11.5% | 2026-Q2 |
| JOHNSON & JOHNSON | 6,641,064 | $90M | 8.4% | 2026-Q2 |
| BlackRock, Inc. added | 4,757,178 | $64M | 6.0% | 2026-Q2 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. added | 4,400,000 | $59M | 5.6% | 2026-Q2 |
| Opaleye Management Inc. added | 3,550,000 | $48M | 4.5% | 2026-Q2 |
| MILLENNIUM MANAGEMENT LLC trimmed | 2,971,752 | $40M | 3.8% | 2026-Q2 |
| 683 Capital Management, LLC trimmed | 2,300,000 | $31M | 2.9% | 2026-Q2 |
| Woodline Partners LP added | 1,500,135 | $20M | 1.9% | 2026-Q2 |
| STATE STREET CORP added | 1,393,222 | $19M | 1.8% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,312,703 | $18M | 1.7% | 2026-Q2 |
| Knoll Capital Management, LLC | 1,250,000 | $17M | 1.6% | 2026-Q2 |
| KENNEDY CAPITAL MANAGEMENT LLC added | 1,105,421 | $15M | 1.4% | 2026-Q2 |
| Long Focus Capital Management, LLC added | 1,080,300 | $15M | 1.4% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 1,015,106 | $14M | 1.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. added | 852,902 | $12M | 1.1% | 2026-Q2 |
| HEIGHTS CAPITAL MANAGEMENT, INC new | 850,000 | $11M | 1.1% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 849,082 | $11M | 1.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 723,563 | $10M | 0.9% | 2026-Q2 |
| Erste Asset Management GmbH trimmed | 691,200 | $9M | 0.8% | 2026-Q2 |
| CITADEL ADVISORS LLC added | 650,489 | $9M | 0.8% | 2026-Q2 |
| Nuveen, LLC added | 639,459 | $9M | 0.8% | 2026-Q2 |
| J. Goldman & Co LP added | 601,972 | $8M | 0.8% | 2026-Q2 |
| Jupiter Topco LLC new | 475,757 | $6M | 0.6% | 2026-Q2 |
| PFM Health Sciences, LP new | 455,286 | $6M | 0.6% | 2026-Q2 |
| Hennion & Walsh Asset Management, Inc. added | 421,979 | $6M | 0.5% | 2026-Q2 |
| NORTHERN TRUST CORP added | 409,855 | $6M | 0.5% | 2026-Q2 |
| PANAGORA ASSET MANAGEMENT INC added | 350,174 | $5M | 0.4% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC trimmed | 327,416 | $4M | 0.4% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 289,720 | $4M | 0.4% | 2026-Q2 |
| JPMORGAN CHASE & CO added | 205,212 | $3M | 0.2% | 2026-Q2 |
| Point72 Asset Management, L.P. added | 202,393 | $3M | 0.3% | 2026-Q2 |
| Ghisallo Capital Management LLC new | 200,000 | $3M | 0.3% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 196,583 | $3M | 0.2% | 2026-Q2 |
| Privium Fund Management B.V. trimmed | 196,112 | $3M | 0.2% | 2026-Q2 |
| UBS Group AG trimmed | 184,574 | $2M | 0.2% | 2026-Q2 |
| Squarepoint Ops LLC added | 162,412 | $2M | 0.2% | 2026-Q2 |
| Y-Intercept (Hong Kong) Ltd added | 148,065 | $2M | 0.2% | 2026-Q2 |
| Russell Investments Group, Ltd. added | 147,329 | $2M | 0.2% | 2026-Q2 |
| WELLINGTON MANAGEMENT GROUP LLP added | 142,923 | $2M | 0.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC added | 142,434 | $2M | 0.2% | 2026-Q2 |
| Bank of New York Mellon Corp added | 138,352 | $2M | 0.2% | 2026-Q2 |
| BLAIR WILLIAM & CO/IL added | 125,478 | $2M | 0.2% | 2026-Q2 |
| Voleon Capital Management LP added | 117,790 | $2M | 0.1% | 2026-Q2 |
| Swiss National Bank new | 111,400 | $2M | 0.1% | 2026-Q2 |
| BARCLAYS PLC added | 98,955 | $1M | 0.1% | 2026-Q2 |
| Invesco Ltd. added | 94,540 | $1M | 0.1% | 2026-Q2 |
| ALPS ADVISORS INC new | 93,186 | $1M | 0.1% | 2026-Q2 |
| Prosight Management, LP trimmed | 90,000 | $1M | 0.1% | 2026-Q2 |
| Aquatic Capital Management LLC added | 87,064 | $1M | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 86,848 | $1M | 0.1% | 2026-Q2 |
| TOCQUEVILLE ASSET MANAGEMENT L.P. added | 77,700 | $1M | 0.1% | 2026-Q2 |
| DAVENPORT & Co LLC added | 72,370 | $978K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP added | 69,092 | $933K | 0.1% | 2026-Q2 |
| Fort Sheridan Advisors LLC trimmed | 66,441 | $898K | 0.1% | 2026-Q2 |
| Quantinno Capital Management LP added | 66,134 | $893K | 0.1% | 2026-Q2 |
| Trexquant Investment LP trimmed | 65,393 | $883K | 0.1% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC new | 64,368 | $870K | 0.1% | 2026-Q2 |
| FRANKLIN RESOURCES INC added | 61,071 | $825K | 0.1% | 2026-Q2 |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM added | 60,550 | $818K | 0.1% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 60,490 | $817K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 59,573 | $805K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 54,690 | $474K | 0.0% | 2026-Q2 |
| AlphaCentric Advisors LLC added | 54,469 | $736K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 53,909 | $728K | 0.1% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 50,162 | $678K | 0.1% | 2026-Q2 |
| BROWN ADVISORY INC | 50,000 | $676K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 49,380 | $668K | 0.1% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD added | 49,200 | $665K | 0.1% | 2026-Q2 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP added | 48,474 | $655K | 0.1% | 2026-Q2 |
| MARTINGALE ASSET MANAGEMENT L P new | 47,854 | $647K | 0.1% | 2026-Q2 |
| SEI INVESTMENTS CO trimmed | 47,600 | $643K | 0.1% | 2026-Q2 |
| VANGUARD ASSET MANAGEMENT, Ltd new | 40,339 | $545K | 0.1% | 2026-Q2 |
| Zurcher Kantonalbank (Zurich Cantonalbank) added | 40,193 | $543K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC added | 35,278 | $477K | 0.0% | 2026-Q2 |
| EntryPoint Capital, LLC added | 34,510 | $466K | 0.0% | 2026-Q2 |
| Virtus Investment Advisers, LLC added | 34,119 | $461K | 0.0% | 2026-Q2 |
| Legal & General Group Plc added | 32,780 | $443K | 0.0% | 2026-Q2 |
| CITIGROUP INC added | 32,733 | $442K | 0.0% | 2026-Q2 |
| LETKO, BROSSEAU & ASSOCIATES INC | 32,000 | $432K | 0.0% | 2026-Q2 |
| AXQ CAPITAL, LP new | 31,189 | $421K | 0.0% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO new | 30,700 | $415K | 0.0% | 2026-Q2 |
| HSBC HOLDINGS PLC trimmed | 28,898 | $379K | 0.0% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP new | 28,769 | $389K | 0.0% | 2026-Q2 |
| XTX Topco Ltd trimmed | 28,007 | $378K | 0.0% | 2026-Q2 |
| PRUDENTIAL FINANCIAL INC new | 27,995 | $378K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 27,684 | $374K | 0.0% | 2026-Q2 |
| Beacon Pointe Advisors, LLC | 26,763 | $362K | 0.0% | 2026-Q2 |
| CreativeOne Wealth, LLC | 26,424 | $357K | 0.0% | 2026-Q2 |
| Mitsubishi UFJ Asset Management Co., Ltd. added | 24,528 | $331K | 0.0% | 2026-Q2 |
| DIVERSIFIED TRUST CO new | 23,922 | $323K | 0.0% | 2026-Q2 |
| IEQ CAPITAL, LLC added | 22,330 | $302K | 0.0% | 2026-Q2 |
| STRS OHIO added | 22,200 | $300K | 0.0% | 2026-Q2 |
| NEW YORK STATE COMMON RETIREMENT FUND added | 21,063 | $285K | 0.0% | 2026-Q2 |
| Creative Planning added | 20,459 | $276K | 0.0% | 2026-Q2 |
| CIBC Bancorp USA Inc. added | 18,319 | $247K | 0.0% | 2026-Q2 |
| State of New Jersey Common Pension Fund D new | 17,957 | $243K | 0.0% | 2026-Q2 |
| Police & Firemen's Retirement System of New Jersey added | 17,732 | $240K | 0.0% | 2026-Q2 |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE added | 17,030 | $230K | 0.0% | 2026-Q2 |
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.