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 Mar 31, 2025
Ownership Breakdown
121
Institutional Holders
▲ 17 vs Q4
$406.66M
Total Inst. Value
▲ $52.77M vs Q4
92.61M
Shares Outstanding
freeFloat 75.71%
59.99M
13F Shares Held
▲ 1.85M vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
PERCEPTIVE ADVISORS LLC biological products, (no diagnostic substances) | 12.58M | 15.92% | 15.92% | $85.25B | Aug 6, 2025 | — held |
SANOFI biological products, (no diagnostic substances) | 12.20M | 15.43% | 15.43% | $82.70B | May 6, 2025 | — held |
JOHNSON & JOHNSON biological products, (no diagnostic substances) | 6.64M | 8.40% | 8.40% | $45.03B | May 7, 2025 | — held |
ADAGE CAPITAL PARTNERS GP, L.L.C. biological products, (no diagnostic substances) | 5.63M | 7.13% | 7.13% | $38.20B | May 15, 2025 | ▲ 600.0K |
PROSIGHT MANAGEMENT, LP biological products, (no diagnostic substances) | 3.69M | 4.67% | 4.67% | $25.03B | May 15, 2025 | ▼ 699.3K |
BLACKROCK, INC. biological products, (no diagnostic substances) | 3.13M | 3.96% | 3.96% | $21.21B | May 2, 2025 | ▲ 156.9K |
683 CAPITAL MANAGEMENT, LLC biological products, (no diagnostic substances) | 2.58M | 3.26% | 3.26% | $17.46B | May 15, 2025 | ▲ 160.0K |
RUBRIC CAPITAL MANAGEMENT LP biological products, (no diagnostic substances) | 1.78M | 2.25% | 2.25% | $12.04B | May 14, 2025 | NEW |
KNOLL CAPITAL MANAGEMENT, LLC biological products, (no diagnostic substances) | 1.25M | 1.58% | 1.58% | $8.47B | May 15, 2025 | — held |
J. GOLDMAN & CO LP biological products, (no diagnostic substances) | 1.16M | 1.47% | 1.47% | $7.86B | May 15, 2025 | ▲ 608.2K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
20
Increased
+2.49M shares5
New Positions
first time holders18
Decreased
−2.33M shares0
Sold Out
fully exitedNet shares change (top 50)
+167.8K
+2.49M / −2.33M
Net new holders
+7
5 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 64.8% of total shares outstanding. Company insiders own approximately 24.29%, while retail and public investors account for the remaining 10.94%.
The largest institutional shareholder of MeiraGTx Holdings plc is PERCEPTIVE ADVISORS LLC, holding approximately 12.58 million shares — equal to 15.92% of outstanding shares — as of March 31, 2025.
A total of 121 institutional investors currently hold MGTX stock, with a combined institutional value of approximately $406,655,065 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 64.8% of shares. The largest shareholder is PERCEPTIVE ADVISORS LLC with a 15.92% stake. Company insiders hold 24.29%. Data sourced from SEC Form 13F as of March 31, 2025.