MeiraGTx Holdings plc
MeiraGTx Holdings plc (MGTX) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · MGTX · as of Sep 30, 2025
Ownership Breakdown
128
Institutional Holders
▲ 13 vs Q2
$527.88M
Total Inst. Value
▲ $108.32M vs Q2
92.61M
Shares Outstanding
freeFloat 75.71%
64.15M
13F Shares Held
▼ 119,445 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
MGTX largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PERCEPTIVE ADVISORS LLC biological products, (no diagnostic substances) | 12.63M | 15.67% | 15.67% | $103.79B | Nov 14, 2025 | — held |
SANOFI biological products, (no diagnostic substances) | 12.20M | 15.14% | 15.14% | $100.39B | Nov 4, 2025 | — held |
JOHNSON & JOHNSON biological products, (no diagnostic substances) | 6.64M | 8.24% | 8.24% | $54.66B | Mar 18, 2026 | — held |
ADAGE CAPITAL PARTNERS GP, L.L.C. biological products, (no diagnostic substances) | 4.18M | 5.19% | 5.19% | $34.44B | Nov 14, 2025 | ▼ 1.85M |
PROSIGHT MANAGEMENT, LP biological products, (no diagnostic substances) | 4.09M | 5.07% | 5.07% | $33.66B | Nov 14, 2025 | ▼ 497.9K |
RUBRIC CAPITAL MANAGEMENT LP biological products, (no diagnostic substances) | 3.73M | 4.62% | 4.62% | $30.67B | Nov 14, 2025 | — held |
BLACKROCK, INC. biological products, (no diagnostic substances) | 2.77M | 3.44% | 3.44% | $22.83B | Nov 12, 2025 | ▼ 88.1K |
683 CAPITAL MANAGEMENT, LLC biological products, (no diagnostic substances) | 2.63M | 3.26% | 3.26% | $21.60B | Nov 14, 2025 | ▼ 65.0K |
MILLENNIUM MANAGEMENT LLC biological products, (no diagnostic substances) | 2.56M | 3.18% | 3.18% | $21.08B | Nov 14, 2025 | ▲ 1.78M |
J. GOLDMAN & CO LP biological products, (no diagnostic substances) | 1.80M | 2.23% | 2.23% | $14.82B | Nov 14, 2025 | ▼ 243.6K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
18
Increased
+3.38M shares3
New Positions
first time holders19
Decreased
−3.11M shares0
Sold Out
fully exitedNet shares change (top 50)
+272.1K
+3.38M / −3.11M
Net new holders
+2
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
MGTX insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
3
Buy transactions
4
Sell transactions
0.75
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Giroux Richard CFO & COO | May 27, 2026 | Gift | 7,000 | — | — | 964.5K | Form 4 ↗ |
Forbes Alexandria PRESIDENT & CEO | May 19, 2026 | Sale | 62,000 | $9.17 | $568.5K | 1.39M | Form 4 ↗ |
Fleck Penny Renee CHIEF DEVELOPMENT OFFICER | May 13, 2026 | Award | 100,000 | $9.97 | $997.0K | 100.0K | Form 4 ↗ |
Fleck Penny Renee CHIEF DEVELOPMENT OFFICER | May 13, 2026 | Award | 100,000 | — | — | 100.0K | Form 4 ↗ |
Zeldin Robert K CHIEF MEDICAL OFFICER | Jan 7, 2026 | Tax Withhold | 7,814 | $7.73 | $60.4K | 146.2K | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Apr 17, 2026 | Award | 555,555 | $9.00 | $5.00M | 10.79M | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Aug 2, 2022 | Award | 400,000 | $15.00 | $6.00M | 400.0K | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Mar 25, 2026 | Award | 400,000 | $8.00 | $3.20M | 400.0K | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Aug 2, 2022 | Award | 300,000 | $20.00 | $6.00M | 300.0K | Form 4 ↗ |
PERCEPTIVE ADVISORS LLC
| Mar 25, 2026 | Award | 300,000 | $8.00 | $2.40M | 300.0K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
MeiraGTx Holdings plc (MGTX) is primarily owned by institutional investors, who hold approximately 69.3% of total shares outstanding. Company insiders own approximately 24.29%, while retail and public investors account for the remaining 6.44%.
The largest institutional shareholder of MeiraGTx Holdings plc is PERCEPTIVE ADVISORS LLC, holding approximately 12.63 million shares — equal to 15.67% of outstanding shares — as of September 30, 2025.
A total of 128 institutional investors currently hold MGTX stock, with a combined institutional value of approximately $527,883,597 as of the most recent 13F filing period.
Frequently asked questions
MGTX ownershipMeiraGTx Holdings plc (MGTX) is primarily owned by institutional investors, who hold approximately 69.3% of shares. The largest shareholder is PERCEPTIVE ADVISORS LLC with a 15.67% stake. Company insiders hold 24.29%. Data sourced from SEC Form 13F as of September 30, 2025.