MEIRAGTX HLDGS PLC MGTX
COM · Common Stock · CUSIP G59665102
- SectorHealth care
- IndustryBiological Products, (No Diagnostic Substances)
- HeadquartersNew York, NY
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($87.2k this quarter). Holder counts are more reliable. Shares outstanding: 78.2m as of 2024-10-29, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $6.09. Options: 5 managers hold calls ($1.7m notional), 3 hold puts ($233.6k).
Trends to Q4 2024
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 100 |
| Q4 2022 | 99 |
| Q1 2023 | 92 |
| Q2 2023 | 80 |
| Q3 2023 | 76 |
| Q4 2023 | 87 |
| Q1 2024 | 97 |
| Q2 2024 | 96 |
| Q3 2024 | 100 |
| Q4 2024 | 103 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2023 | 44 | 45 |
| Q2 2023 | 38 | 41 |
| Q3 2023 | 27 | 34 |
| Q4 2023 | 44 | 29 |
| Q1 2024 | 48 | 38 |
| Q2 2024 | 48 | 43 |
| Q3 2024 | 46 | 36 |
| Q4 2024 | 56 | 36 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2024 | $72.1k | $225.6k | 3.13 |
| Q2 2024 | $130.6k | $200.7k | 1.54 |
| Q3 2024 | $87.2k | $264.2k | 3.03 |
| Q4 2024 | $1.7m | $233.6k | 0.14 |
Biggest buyers
| Woodline Partners LP | New | +1.5m |
| BlackRock, Inc. | Added | +284.8k |
| Long Focus Capital Management, LLC | New | +189.7k |
| READYSTATE ASSET MANAGEMENT LP | New | +118.8k |
| UBS Group AG | Added | +92.0k |
| Knott David M Jr | Added | +90.4k |
| GEODE CAPITAL MANAGEMENT, LLC | Added | +80.4k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | +78.8k |
| VANGUARD GROUP INC | Added | +77.1k |
| Janney Montgomery Scott LLC | New | +75.3k |
Biggest sellers
| Prosight Management, LP | Reduced | -509.7k |
| Monashee Investment Management LLC | Sold out | -450.5k |
| JPMORGAN CHASE & CO | Reduced | -379.4k |
| J. Goldman & Co LP | Reduced | -308.8k |
| ADAGE CAPITAL PARTNERS GP, L.L.C. | Reduced | -194.5k |
| ROYCE & ASSOCIATES LP | Reduced | -185.1k |
| 683 Capital Management, LLC | Reduced | -135.0k |
| Laurion Capital Management LP | Sold out | -128.3k |
| BANK OF MONTREAL /CAN/ | Sold out | -92.7k |
| Russell Investments Group, Ltd. | Reduced | -64.6k |
Biggest calls
| J. Goldman & Co LP | New | $1.7m271.9k shares |
| GROUP ONE TRADING LLC | Added | $49.3k8.1k shares |
| SIMPLEX TRADING, LLC | Added | $23.0k3.9k shares |
| CITADEL ADVISORS LLC | Reduced | $1.8k300 shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Biggest puts
| CITADEL ADVISORS LLC | Reduced | $187.6k30.8k shares |
| SIMPLEX TRADING, LLC | Reduced | $46.0k7.6k shares |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | Unchanged | $00 shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| PERCEPTIVE ADVISORS LLC 13D · may seek influence -0.3 pts · filed 2026-04-24 | 12.6% |
| Rubric Capital Management LP 13G · institution +1.9 pts · filed 2026-08-14 | 9.8% |
Fell to 5% or below in the last year: Adage Capital Management, L.P. (4.9%, 2026-05-13), Prosight Management, LP (4.0%, 2026-02-13)
Insider purchases and sales in Q4 2024
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2023 | 0 | — | 0 | — | — |
| Q2 2023 | 1 | $25.0m | 0 | — | — |
| Q3 2023 | 0 | — | 0 | — | — |
| Q4 2023 | 0 | — | 0 | — | — |
| Q1 2024 | 0 | — | 0 | — | — |
| Q2 2024 | 0 | — | 0 | — | — |
| Q3 2024 | 1 | $5.0m | 0 | — | — |
| Q4 2024 | 0 | — | 0 | — | — |
None reported in Q4 2024.
Holders, Q4 2024
| Manager | Shares | Change |
|---|---|---|
| PERCEPTIVE ADVISORS LLC 2.13% of their portfolio | 12.6m $76.6m | Unchanged |
| Sanofi 42.60% of their portfolio | 12.2m $74.3m | First filing |
| JOHNSON & JOHNSON 10.47% of their portfolio | 6.6m $40.4m | Unchanged |
| ADAGE CAPITAL PARTNERS GP, L.L.C. 0.05% of their portfolio | 5.0m $30.7m | Reduced -194.5k |
| Prosight Management, LP 7.49% of their portfolio | 4.4m $26.7m | Reduced -509.7k |
| BlackRock, Inc. 0.00% of their portfolio | 3.0m $18.1m | Added +284.8k |
| 683 Capital Management, LLC 1.45% of their portfolio | 2.4m $14.7m | Reduced -135.0k |
| Woodline Partners LP 0.06% of their portfolio | 1.5m $9.3m | New |
| Knoll Capital Management, LLC 4.90% of their portfolio | 1.2m $7.6m | Unchanged |
| Erste Asset Management GmbH 0.05% of their portfolio | 669.7k $4.0m | Unchanged |
| ROYCE & ASSOCIATES LP 0.03% of their portfolio | 610.3k $3.7m | Reduced -185.1k |
| STATE STREET CORP 0.00% of their portfolio | 602.3k $3.7m | Added +27.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 570.6k $3.5m | Added +80.4k |
| J. Goldman & Co LP 0.12% of their portfolio | 550.5k $3.4m | Reduced -308.8k |
| VANGUARD GROUP INC 0.00% of their portfolio | 458.9k $2.8m | Added +77.1k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 398.8k $2.4m | Reduced -51.1k |
| Alyeska Investment Group, L.P. 0.01% of their portfolio | 330.2k $2.0m | Unchanged |
| NORTHERN TRUST CORP 0.00% of their portfolio | 315.7k $1.9m | Added +50.3k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 306.0k $1.9m | Reduced -379.4k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 282.3k $1.7m | Reduced -64.6k |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 268.4k $1.6m | Added +71.6k |
| PLATINUM INVESTMENT MANAGEMENT LTD 0.09% of their portfolio | 250.0k $1.5m | Unchanged |
| Privium Fund Management B.V. 0.31% of their portfolio | 225.1k $1.4m | Added +11.1k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 221.3k $1.3m | Added +20.5k |
| MORGAN STANLEY 0.00% of their portfolio | 213.6k $1.3m | Added +21.3k |
| Nuveen Asset Management, LLC 0.00% of their portfolio | 191.3k $1.2m | Added +57.7k |
| Long Focus Capital Management, LLC 0.09% of their portfolio | 189.7k $1.2m | New |
| WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio | 151.1k $920.4k | Added +1.4k |
| BARCLAYS PLC 0.00% of their portfolio | 147.8k $899.8k | Reduced -72 |
| BLAIR WILLIAM & CO/IL 0.00% of their portfolio | 132.5k $807.1k | Added +400 |
| D. E. Shaw & Co., Inc. 0.00% of their portfolio | 123.6k $753.0k | Added +36.0k |
| UBS Group AG 0.00% of their portfolio | 119.5k $727.7k | Added +92.0k |
| READYSTATE ASSET MANAGEMENT LP 0.03% of their portfolio | 118.8k $723.7k | New |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 112.0k $682.2k | Added +13.0k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 106.6k $649.1k | Added +10.2k |
| Knott David M Jr 0.21% of their portfolio | 95.1k $579.0k | Added +90.4k |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio | 91.5k $557.4k | Added +78.8k |
| DAVENPORT & Co LLC 0.00% of their portfolio | 77.2k $470.1k | Added +5.0k |
| Janney Montgomery Scott LLC 0.00% of their portfolio | 75.3k $459.0k | New |
| Fort Sheridan Advisors LLC 0.06% of their portfolio | 70.0k $426.0k | Added +4.6k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 63.9k $389.1k | Added +9.0k |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 54.9k $334.3k | Added +6.0k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 50.4k $306.9k | Unchanged |
| MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio | 48.9k $297.5k | Reduced -41.7k |
| LOS ANGELES CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 46.4k $282.4k | Reduced -49.0k |
| LETKO, BROSSEAU & ASSOCIATES INC 0.01% of their portfolio | 45.3k $275.9k | Unchanged |
| CreativeOne Wealth, LLC 0.01% of their portfolio | 44.0k $268.0k | Reduced -14.6k |
| TOCQUEVILLE ASSET MANAGEMENT L.P. 0.00% of their portfolio | 42.5k $258.8k | Added +1.4k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 42.2k $257.0k | Added +13.1k |
| CITIGROUP INC 0.00% of their portfolio | 40.4k $245.9k | Added +10.9k |
| Trexquant Investment LP 0.00% of their portfolio | 39.3k $239.6k | New |
| KENNEDY CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 33.5k $203.8k | Added +6.2k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 33.4k $203.1k | Reduced -24.3k |
| MetLife Investment Management, LLC 0.00% of their portfolio | 31.0k $188.6k | Added +12.7k |
| SkyView Investment Advisors, LLC 0.03% of their portfolio | 30.0k $183.0k | Unchanged |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 26.7k $161.1k | Reduced -17 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.00% of their portfolio | 26.3k $160.0k | Added +5.0k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 23.6k $143.7k | Added +8.7k |
| Corebridge Financial, Inc. 0.00% of their portfolio | 23.1k $141.0k | Added +2.4k |
| SG Americas Securities, LLC 0.00% of their portfolio | 22.2k $135.0k | Added +2.6k |
| Invesco Ltd. 0.00% of their portfolio | 20.3k $123.4k | Added +7.6k |
| PUREfi Wealth, LLC 0.12% of their portfolio | 20.0k $121.8k | First filing |
| JANE STREET GROUP, LLC 0.00% of their portfolio | 18.0k $109.9k | Reduced -3.4k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 18.0k $110.0k | Added +5.3k |
| ProShare Advisors LLC 0.00% of their portfolio | 16.8k $102.4k | Added +4.9k |
| China Universal Asset Management Co., Ltd. 0.01% of their portfolio | 16.6k $100.9k | Added +1.7k |
| MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio | 16.3k $99.1k | Reduced -620 |
| CIBC Private Wealth Group LLC 0.00% of their portfolio | 15.0k $95.2k | Unchanged |
| Polymer Capital Management (US) LLC 0.03% of their portfolio | 14.5k $88.1k | First filing |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 12.9k $78.4k | Reduced -2.7k |
| INTECH INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 12.5k $76.0k | New |
| Engineers Gate Manager LP 0.00% of their portfolio | 12.3k $75.1k | New |
| STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.00% of their portfolio | 12.2k $74.5k | Unchanged |
| Police & Firemen's Retirement System of New Jersey 0.00% of their portfolio | 11.7k $71.0k | First filing |
| ROYAL BANK OF CANADA 0.00% of their portfolio | 7.9k $49.0k | Reduced -1.8k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.00% of their portfolio | 7.3k $44.2k | Unchanged |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 6.0k $36.5k | Reduced -3.3k |
| Tower Research Capital LLC (TRC) 0.00% of their portfolio | 5.0k $30.3k | Added +2.0k |
| Ameritas Investment Partners, Inc. 0.00% of their portfolio | 4.9k $29.7k | Added +2.5k |
| Legal & General Group Plc 0.00% of their portfolio | 4.3k $26.4k | Unchanged |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 3.4k $21.0k | Added +635 |
| Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio | 2.6k $16.2k | Reduced -195 |
| FMR LLC 0.00% of their portfolio | 2.3k $14.2k | Added +496 |
| OSAIC HOLDINGS, INC. 0.00% of their portfolio | 2.3k $14.0k | Unchanged |
| SIMPLEX TRADING, LLC 0.00% of their portfolio | 2.2k $13.0k | Reduced -3.5k |
| Zurcher Kantonalbank (Zurich Cantonalbank) 0.00% of their portfolio | 1.9k $11.8k | Reduced -410 |
| GF FUND MANAGEMENT CO. LTD. 0.00% of their portfolio | 1.6k $10.0k | First filing |
| Sandy Spring Bank 0.00% of their portfolio | 1.5k $9.1k | Added +500 |
| AMALGAMATED BANK 0.00% of their portfolio | 1.0k $6.0k | Unchanged |
| WASHINGTON TRUST Co 0.00% of their portfolio | 479 $2.9k | Unchanged |
| CWM, LLC 0.00% of their portfolio | 472 $3.0k | Added +276 |
| Sterling Capital Management LLC 0.00% of their portfolio | 460 $2.8k | Added +392 |
| Versant Capital Management, Inc 0.00% of their portfolio | 425 $2.6k | Added +236 |
| SBI Securities Co., Ltd. 0.00% of their portfolio | 224 $1.4k | First filing |
| NISA INVESTMENT ADVISORS, LLC 0.00% of their portfolio | 198 $1.2k | Added +174 |
| Daiwa Securities Group Inc. 0.00% of their portfolio | 130 $1.0k | Unchanged |
| GAMMA Investing LLC 0.00% of their portfolio | 120 $731 | New |
| Arax Advisory Partners 0.00% of their portfolio | 113 $689 | Added +40 |
| LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio | 96 $0 | Unchanged |
| ROTHSCHILD INVESTMENT LLC 0.00% of their portfolio | 95 $579 | New |