MGTX · MeiraGTx Holdings plc · Shareholders & Ownership

$9.97 +0.52 (+5.50%) At close · Oct 20

Russell 2000 member Rebalance outlook locked

Market Cap

$907.61M

96.04M

Volume · Oct 20 755.9K Avg daily vol (3M) 786.21K

Every disclosed holder of MGTX in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.

How the holder list picks a filing →

Who Owns MGTX

13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positions

Holder group	Holders	Shares	% Out	Summed
Institutional (13F)	160	79,432,598	82.71%	Yes
Insiders (Forms 3, 4, 5)	7	3,346,329	3.48%	Yes
13D/G-only blocks	1	3,266,806	3.40%	Yes
Remaining	—	9,997,263	10.41%	Rest
Registered funds (N-PORT, not summed)	44	1,683,476	1.75%	No

Shares outstanding: 96,042,996, the issuer's latest cover-page count restated onto today's split basis.

13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.

Holders of MGTX

One row per holder Every filing By ultimate parent

All 13F Funds Insiders 13D/G Non-US

#	Holder	Shares	% Out	Change	As of	Notes
1	Sanofi 13F CIK 1121404 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	12,197,737	12.70%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
2	PERCEPTIVE ADVISORS LLC 13F CIK 1224962 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	10,786,658	11.23%	+460,555	Jun 30, 2026	carried, not yet filed for the newest quarter
2.1	PERCEPTIVE ADVISORS LLC Insider CIK 1224962 · Apr 17, 2026 10% Owner, issuer-wide, not summed	10,786,658	11.23%	+555,555	Apr 17, 2026	10% Owner, issuer-wide, not summed
3	Rubric Capital Management LP 13F CIK 1687509 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	9,100,000	9.47%	+2,100,000	Jun 30, 2026	carried, not yet filed for the newest quarter
3.1	Rubric Capital Management LP 13G CIK 1687509 · Registered investment adviser · Jun 30, 2026 Rule 13d-1(b), qualified institution, not summed	9,100,000	9.47%	+2,924,669	Jun 30, 2026	Rule 13d-1(b), qualified institution, not summed
4	JOHNSON & JOHNSON 13F CIK 200406 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	6,641,064	6.91%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
5	BlackRock, Inc. 13F CIK 2012383 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	4,757,178	4.95%	+1,589,030	Jun 30, 2026	carried, not yet filed for the newest quarter
6	ADAGE CAPITAL PARTNERS GP, L.L.C. 13F CIK 1165408 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	4,400,000	4.58%	+400,000	Jun 30, 2026	carried, not yet filed for the newest quarter
7	Opaleye Management Inc. 13F CIK 1595855 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	3,550,000	3.70%	+1,426,741	Jun 30, 2026	carried, not yet filed for the newest quarter
8	ADENA ESTATE INC. 13G CIK 1799740 · Unknown · Dec 31, 2023 Rule 13d-1(d), exempt investor	3,266,806	3.40%	—	Dec 31, 2023	Rule 13d-1(d), exempt investor
9	MILLENNIUM MANAGEMENT LLC 13F CIK 1273087 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,971,752	3.09%	-493,947	Jun 30, 2026	carried, not yet filed for the newest quarter
10	683 Capital Management, LLC 13F CIK 1404574 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	2,300,000	2.39%	-150,000	Jun 30, 2026	carried, not yet filed for the newest quarter
11	Woodline Partners LP 13F CIK 1784547 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,500,135	1.56%	+1,199,812	Jun 30, 2026	carried, not yet filed for the newest quarter
12	STATE STREET CORP 13F CIK 93751 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	1,393,222	1.45%	+639,844	Jun 30, 2026	carried, not yet filed for the newest quarter
13	Forbes Alexandria Insider CIK 1678604 · Aug 18, 2026 Director, PRESIDENT & CEO, issuer-wide	1,325,695	1.38%	-62,000	Aug 18, 2026	Director, PRESIDENT & CEO, issuer-wide
14	MORGAN STANLEY 13F CIK 895421 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	1,312,703	1.37%	-277,237	Jun 30, 2026	carried, not yet filed for the newest quarter
15	Knoll Capital Management, LLC 13F CIK 1325083 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	1,250,000	1.30%	0	Jun 30, 2026	carried, not yet filed for the newest quarter
16	KENNEDY CAPITAL MANAGEMENT LLC 13F CIK 884589 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,105,421	1.15%	+247,042	Jun 30, 2026	carried, not yet filed for the newest quarter
16.1	Kennedy Capital Small Cap Growth Fund Fund S000076117 · Registered fund · Jun 30, 2026 INVESTMENT MANAGERS SERIES TRUST II, not summed	366	0.00%	—	Jun 30, 2026	INVESTMENT MANAGERS SERIES TRUST II, not summed
17	Long Focus Capital Management, LLC 13F CIK 1602716 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,080,300	1.12%	+555,555	Jun 30, 2026	carried, not yet filed for the newest quarter
18	JACOBS LEVY EQUITY MANAGEMENT, INC 13F CIK 884414 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	1,015,106	1.06%	+1,001,433	Jun 30, 2026	carried, not yet filed for the newest quarter
19	Giroux Richard Insider CIK 1742734 · Oct 20, 2026 CFO & COO, issuer-wide	942,682	0.98%	—	Oct 20, 2026	CFO & COO, issuer-wide
20	D. E. Shaw & Co., Inc. 13F CIK 1009207 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	852,902	0.89%	+427,621	Jun 30, 2026	carried, not yet filed for the newest quarter
21	HEIGHTS CAPITAL MANAGEMENT, INC 13F CIK 1081698 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	850,000	0.89%	+850,000	Jun 30, 2026	carried, not yet filed for the newest quarter
22	GEODE CAPITAL MANAGEMENT, LLC 13F CIK 1214717 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	849,082	0.88%	+264,183	Jun 30, 2026	carried, not yet filed for the newest quarter
23	VANGUARD PORTFOLIO MANAGEMENT LLC 13F CIK 2100121 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	723,563	0.75%	+326,282	Jun 30, 2026	carried, not yet filed for the newest quarter
24	Erste Asset Management GmbH 13F CIK 2024532 · Non-US institution · Jun 30, 2026 carried, not yet filed for the newest quarter	691,200	0.72%	-28,502	Jun 30, 2026	carried, not yet filed for the newest quarter
25	CITADEL ADVISORS LLC 13F CIK 1423053 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	650,489	0.68%	+534,494	Jun 30, 2026	carried, not yet filed for the newest quarter
26	Nuveen, LLC 13F CIK 1871926 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	639,459	0.67%	+507,005	Jun 30, 2026	carried, not yet filed for the newest quarter
26.1	Nuveen Quant Small Cap Equity Fund Fund S000005386 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	526,570	0.55%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
26.2	Nuveen Small Cap Blend Index Fund Fund S000005367 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	79,737	0.08%	+27,428	Jul 31, 2026	TIAA-CREF Funds, not summed
26.3	Nuveen Equity Index Fund Fund S000005360 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	77,592	0.08%	0	Jul 31, 2026	TIAA-CREF Funds, not summed
26.4	Nuveen Quant Mid Cap Growth Fund Fund S000005384 · Registered fund · Jul 31, 2026 TIAA-CREF Funds, not summed	71,980	0.07%	—	Jul 31, 2026	TIAA-CREF Funds, not summed
26.5	College Retirement Equities Fund - Total Global Stock Account Fund S000005080 · Registered fund · Jun 30, 2026 College Retirement Equities Fund, not summed	52,420	0.05%	—	Jun 30, 2026	College Retirement Equities Fund, not summed
27	Naylor Stuart Insider CIK 1742771 · Oct 6, 2026 CHIEF DEV. OFFICER, issuer-wide	613,187	0.64%	-27,659	Oct 6, 2026	CHIEF DEV. OFFICER, issuer-wide
28	J. Goldman & Co LP 13F CIK 1412741 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	601,972	0.63%	+395,762	Jun 30, 2026	carried, not yet filed for the newest quarter
29	Jupiter Topco LLC 13F CIK 2146052 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	475,757	0.50%	+475,757	Jun 30, 2026	carried, not yet filed for the newest quarter
30	PFM Health Sciences, LP 13F CIK 1442756 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	455,286	0.47%	+455,286	Jun 30, 2026	carried, not yet filed for the newest quarter
31	Hennion & Walsh Asset Management, Inc. 13F CIK 1861642 · Unknown · Sep 30, 2026	433,504	0.45%	+11,525	Sep 30, 2026
32	NORTHERN TRUST CORP 13F CIK 73124 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	409,855	0.43%	+137,976	Jun 30, 2026	carried, not yet filed for the newest quarter
32.1	Small Cap Index Fund Fund S000001245 · Registered fund · Jun 30, 2026 Northern Funds, not summed	30,333	0.03%	+8,528	Jun 30, 2026	Northern Funds, not summed
32.2	Small Cap Core Fund Fund S000001244 · Registered fund · Jun 30, 2026 Northern Funds, not summed	8,584	0.01%	-408	Jun 30, 2026	Northern Funds, not summed
33	PANAGORA ASSET MANAGEMENT INC 13F CIK 883677 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	350,174	0.36%	+350,174	Jun 30, 2026	carried, not yet filed for the newest quarter
34	GOLDMAN SACHS GROUP INC 13F CIK 886982 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	327,416	0.34%	-113,998	Jun 30, 2026	carried, not yet filed for the newest quarter
35	BANK OF AMERICA CORP /DE/ 13F CIK 70858 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	289,720	0.30%	+44,776	Jun 30, 2026	carried, not yet filed for the newest quarter
36	VANGUARD RUSSELL 2000 INDEX FUND Fund S000030003 · Registered fund · May 31, 2026 VANGUARD SCOTTSDALE FUNDS, not summed	232,099	0.24%	+8,666	May 31, 2026	VANGUARD SCOTTSDALE FUNDS, not summed
37	Assenagon Asset Management S.A. 13F CIK 1546007 · Unknown · Sep 30, 2026	225,363	0.23%	+225,363	Sep 30, 2026
38	JPMORGAN CHASE & CO 13F CIK 19617 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	205,212	0.21%	+180,874	Jun 30, 2026	carried, not yet filed for the newest quarter
39	Point72 Asset Management, L.P. 13F CIK 1603466 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	202,393	0.21%	+131,440	Jun 30, 2026	carried, not yet filed for the newest quarter
40	Ghisallo Capital Management LLC 13F CIK 1825214 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	200,000	0.21%	+200,000	Jun 30, 2026	carried, not yet filed for the newest quarter
41	Harris Keith R. Insider CIK 1742703 · Jun 10, 2026 Director, issuer-wide	200,000	0.21%	+75,000	Jun 10, 2026	Director, issuer-wide
42	AQR CAPITAL MANAGEMENT LLC 13F CIK 1167557 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	196,583	0.20%	+85,590	Jun 30, 2026	carried, not yet filed for the newest quarter
43	Privium Fund Management B.V. 13F CIK 1795097 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	196,112	0.20%	-16,000	Jun 30, 2026	carried, not yet filed for the newest quarter
44	UBS Group AG 13F CIK 1610520 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	184,574	0.19%	-118,624	Jun 30, 2026	carried, not yet filed for the newest quarter
45	Zeldin Robert K Insider CIK 1745347 · Feb 21, 2026 CHIEF MEDICAL OFFICER, issuer-wide	172,888	0.18%	+4,548	Feb 21, 2026	CHIEF MEDICAL OFFICER, issuer-wide
46	Squarepoint Ops LLC 13F CIK 1642575 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	162,412	0.17%	+143,828	Jun 30, 2026	carried, not yet filed for the newest quarter
47	Russell Investments Group, Ltd. 13F CIK 1692234 · Unknown · Jun 30, 2026 carried, not yet filed for the newest quarter	147,329	0.15%	+50,161	Jun 30, 2026	carried, not yet filed for the newest quarter
48	WELLINGTON MANAGEMENT GROUP LLP 13F CIK 902219 · Holding company · Jun 30, 2026 carried, not yet filed for the newest quarter	142,923	0.15%	+16,592	Jun 30, 2026	carried, not yet filed for the newest quarter
49	CHARLES SCHWAB INVESTMENT MANAGEMENT INC 13F CIK 884546 · Registered investment adviser · Jun 30, 2026 carried, not yet filed for the newest quarter	142,434	0.15%	+42,240	Jun 30, 2026	carried, not yet filed for the newest quarter
50	Bank of New York Mellon Corp 13F CIK 1390777 · Bank · Jun 30, 2026 carried, not yet filed for the newest quarter	138,352	0.14%	+38,255	Jun 30, 2026	carried, not yet filed for the newest quarter

3 more nested rows are not shown here; Every filing lists them all.

Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.

Showing 1–50 of 194 holders

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Key facts CIK 1735438 CUSIP G59665102 13F (30d) 15 filings 15 filers Visit website Investor relations