GH Research PLC: which funds bought and sold

Institutions that bought and sold GH Research shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 35 institutions that filed 13F reports for both quarters added to or opened positions in GH Research, and 25 cut or closed them. Together they added a net 3.9M shares, +8.2% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 3.7M shares (+16.8%); index fund managers were net buyers of 24K shares (+4.4%). 17 opened a new position and 9 sold out entirely.

Bought, Q2 2026 35 institutions, 17 of them new holders Sold, Q2 2026 25 institutions, 9 of them sold out

Net change, all compared +3.9M shares (+8.2%)

Net change, active managers +3.7M shares (+16.8%), 13 bought, 6 sold

Buyers versus sellers

institutions compared, 70

35 bought 10 25 sold

Active managers and hedge funds 13 bought · 6 sold · +3.7M

Index fund managers 2 bought · 1 sold · +24K

Other institutions 20 bought · 18 sold · +151K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Deep Track Capital, LP Hedge fund	+3.3M New position	3.3M	$89.6M
Lynx1 Capital Management LP	+2.5M +23.2%	13.3M	$357M
FMR LLC Active manager	+841K +16.4%	6.0M	$161M
Foresite Capital Management Vi LLC	+625K +198.1%	940K	$25.3M
Braidwell LP Hedge fund	+207K New position	207K	$5.6M
Jane Street Group, LLC	+170K New position	170K	$4.6M
Goldman Sachs Group Inc	+104K +231.9%	149K	$4M
Trexquant Investment LP Hedge fund	+84K +120.3%	154K	$4.1M
HRT Financial LP	+65K New position	65K	$1.8M
UBS Group AG	+65K +15.8%	477K	$12.8M
Point72 Asset Management, L.P. Hedge fund	+51K New position	51K	$1.4M
Qube Research & Technologies Ltd Hedge fund	+44K New position	44K	$1.2M
Xtx Topco Ltd	+35K +67.0%	87K	$2.3M
Morgan Stanley	+26K +102.2%	52K	$1.4M
D. E. Shaw & Co., Inc. Hedge fund	+25K New position	25K	$681,274
Blackrock, Inc. Index funds	+25K +5.4%	480K	$12.9M
Quadrature Capital Ltd Hedge fund	+21K New position	21K	$567,625
Citadel Advisors LLC Hedge fund	+20K +31.3%	86K	$2.3M
Squarepoint Ops LLC Hedge fund	+18K New position	18K	$495,398
Tudor Investment Corp Et Al Hedge fund	+16K +84.7%	34K	$921,393

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Deep Track Capital, LP Hedge fund	+3.3M New position	3.3M	$89.6M
FMR LLC Active manager	+841K +16.4%	6.0M	$161M
Braidwell LP Hedge fund	+207K New position	207K	$5.6M
Trexquant Investment LP Hedge fund	+84K +120.3%	154K	$4.1M
Point72 Asset Management, L.P. Hedge fund	+51K New position	51K	$1.4M
Qube Research & Technologies Ltd Hedge fund	+44K New position	44K	$1.2M
D. E. Shaw & Co., Inc. Hedge fund	+25K New position	25K	$681,274
Quadrature Capital Ltd Hedge fund	+21K New position	21K	$567,625
Citadel Advisors LLC Hedge fund	+20K +31.3%	86K	$2.3M
Squarepoint Ops LLC Hedge fund	+18K New position	18K	$495,398

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Toronto Dominion Bank	−1.4M Sold out	0	—
Troluce Capital Advisors LLC	−990K Sold out	0	—
Millennium Management LLC Hedge fund	−614K −65.5%	323K	$8.7M
5Am Venture Management, LLC	−573K Sold out	0	—
Squadron Capital Management LLC	−325K Sold out	0	—
Centerbook Partners LP Hedge fund	−147K −67.9%	69K	$1.9M
Boothbay Fund Management, LLC Hedge fund	−81K −28.6%	202K	$5.4M
Occam Crest Management LP	−80K Sold out	0	—
Highvista Strategies LLC	−54K −25.5%	159K	$4.3M
Marshall Wace, LLP Hedge fund	−44K −48.7%	47K	$1.3M
RA Capital Management, L.P. Hedge fund	−40K −0.5%	7.6M	$205M
Diadema Partners LP	−27K Sold out	0	—
Renaissance Technologies LLC Hedge fund	−21K Sold out	0	—
Persistent Asset Partners Ltd	−6,794 Sold out	0	—
Virtus Investment Advisers, LLC	−5,428 −25.9%	15K	$416,425
Hightower Advisors, LLC	−2,900 −18.6%	13K	$341,376
Arkos Global Advisors	−1,180 Sold out	0	—
Northern Trust Corp Index funds	−841 −2.6%	32K	$855,967
Mirae Asset Global Investments Co., Ltd.	−167 −5.2%	3,068	$82,468
Osaic Holdings, Inc.	−150 −2.5%	5,775	$155,232

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−614K −65.5%	323K	$8.7M
Centerbook Partners LP Hedge fund	−147K −67.9%	69K	$1.9M
Boothbay Fund Management, LLC Hedge fund	−81K −28.6%	202K	$5.4M
Marshall Wace, LLP Hedge fund	−44K −48.7%	47K	$1.3M
RA Capital Management, L.P. Hedge fund	−40K −0.5%	7.6M	$205M
Renaissance Technologies LLC Hedge fund	−21K Sold out	0	—

New positions

largest by value

Institution	Shares	Value June 30, 2026
Deep Track Capital, LPHedge fund	3.3M	$89.6M
Braidwell LPHedge fund	207K	$5.6M
Jane Street Group, LLC	170K	$4.6M
HRT Financial LP	65K	$1.8M
Point72 Asset Management, L.P.Hedge fund	51K	$1.4M
Qube Research & Technologies LtdHedge fund	44K	$1.2M
D. E. Shaw & Co., Inc.Hedge fund	25K	$681,274
Quadrature Capital LtdHedge fund	21K	$567,625
Squarepoint Ops LLCHedge fund	18K	$495,398
Letko, Brosseau & Associates IncActive manager	15K	$414,624

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Toronto Dominion Bank	1.4M	$19.7M
Troluce Capital Advisors LLC	990K	$13.9M
5Am Venture Management, LLC	573K	$8.1M
Squadron Capital Management LLC	325K	$4.6M
Occam Crest Management LP	80K	$1.1M
Diadema Partners LP	27K	$377,314
Renaissance Technologies LLCHedge fund	21K	$289,833
Persistent Asset Partners Ltd	6,794	$95,524
Arkos Global Advisors	1,180	$17,000

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 62
Ten largest holders: 94.6%
Index fund managers: 1.1%
Active managers and hedge funds: 50.5%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	13	6	9	1	+3.7M	+16.8%
Index fund managers	2	1	0	0	+24K	+4.4%
Other institutions	20	18	8	8	+151K	+0.6%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on GH Research.

Only managers that filed a holdings report for both quarters are compared (70 here). 1 other holder is left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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