Vault-13

GH RESEARCH PLC GHRS

ORDINARY SHARES · Common Stock · CUSIP G3855L106

63 institutional holders +9 vs Q1 2026
51,499,87151.5m shares reported held*
$1.4bnreported value*
17 new 18 added 16 reduced 9 sold out net bought ≈ $105.2m (+3.9m shares)

* 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. Holder counts are more reliable. Implied quarter-end price ≈ $26.88. Options: 5 managers hold calls ($1.7m notional), 2 hold puts ($365.6k).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

0255075Q3 22: 34Q4 22: 33Q1 23: 30Q2 23: 35Q3 23: 30Q4 23: 36Q1 24: 33Q2 24: 29Q3 24: 29Q4 24: 32Q1 25: 37Q2 25: 39Q3 25: 47Q4 25: 53Q1 26: 54Q2 26: 6363Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202234
Q4 202233
Q1 202330
Q2 202335
Q3 202330
Q4 202336
Q1 202433
Q2 202429
Q3 202429
Q4 202432
Q1 202537
Q2 202539
Q3 202547
Q4 202553
Q1 202654
Q2 202663

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
40040Q3 24: 9 bought or addedQ3 24: 11 cut or sold outQ4 24: 11 bought or addedQ4 24: 8 cut or sold outQ4 24Q1 25: 23 bought or addedQ1 25: 16 cut or sold outQ2 25: 20 bought or addedQ2 25: 15 cut or sold outQ2 25Q3 25: 32 bought or addedQ3 25: 15 cut or sold outQ4 25: 31 bought or addedQ4 25: 23 cut or sold outQ4 25Q1 26: 31 bought or addedQ1 26: 23 cut or sold outQ2 26: 35 bought or addedQ2 26: 25 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 2024911
Q4 2024118
Q1 20252316
Q2 20252015
Q3 20253215
Q4 20253123
Q1 20263123
Q2 20263525

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$500k$1m$1.5m$2mQ3 25 calls: $185.9kQ3 25 puts: $424.5kQ3 25P/C 2.28Q4 25 calls: $547.4kQ4 25 puts: $990.6kQ4 25P/C 1.81Q1 26 calls: $161.7kQ1 26 puts: $2.8kQ1 26P/C 0.02Q2 26 calls: $1.7mQ2 26 puts: $365.6kQ2 26P/C 0.22
Numbers
QuarterCallsPutsP/C
Q3 2025$185.9k$424.5k2.28
Q4 2025$547.4k$990.6k1.81
Q1 2026$161.7k$2.8k0.02
Q2 2026$1.7m$365.6k0.22

Biggest buyers

Deep Track Capital, LP New +3,333,334+3.3m
Lynx1 Capital Management LP Added +2,500,000+2.5m
FMR LLC Added +841,000+841.0k
Foresite Capital Management VI LLC Added +625,001+625.0k
BRAIDWELL LP New +207,240+207.2k
JANE STREET GROUP, LLC New +169,951+170.0k
GOLDMAN SACHS GROUP INC Added +103,878+103.9k
Trexquant Investment LP Added +83,959+84.0k
HRT FINANCIAL LP New +65,375+65.4k
UBS Group AG Added +64,992+65.0k

Biggest sellers

TORONTO DOMINION BANK Sold out -1,397,873-1.4m
Troluce Capital Advisors LLC Sold out -990,472-990.5k
MILLENNIUM MANAGEMENT LLC Reduced -614,499-614.5k
5AM Venture Management, LLC Sold out -572,665-572.7k
Squadron Capital Management LLC Sold out -325,000-325.0k
CenterBook Partners LP Reduced -147,138-147.1k
BOOTHBAY FUND MANAGEMENT, LLC Reduced -80,788-80.8k
Occam Crest Management LP Sold out -80,000-80.0k
HighVista Strategies LLC Reduced -54,442-54.4k
MARSHALL WACE, LLP Reduced -44,411-44.4k

Biggest calls

JANE STREET GROUP, LLC New $787.6k29.3k shares
CITADEL ADVISORS LLC New $532.2k19.8k shares
SUSQUEHANNA INTERNATIONAL GROUP, LLP Added $360.2k13.4k shares
GROUP ONE TRADING LLC Unchanged $2.7k100 shares
SIMPLEX TRADING, LLC Reduced $2.7k100 shares

Biggest puts

JANE STREET GROUP, LLC New $360.2k13.4k shares
SIMPLEX TRADING, LLC Added $5.4k200 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.

HolderStakeChangeShares Last filed
Lynx1 Capital Management LP 13G · passive investor +1.9 pts · filed 2026-08-14 19.3% +1.9 pts 13.3m≈ $354.0m 2026-08-14
BIOTECHNOLOGY VALUE FUND L P 13G · exempt (held before listing) filed 2025-05-15 14.2% 8.8m≈ $237.3m 2025-05-15
RTW INVESTMENTS, LP 13G · institution filed 2025-05-15 8.9% 5.5m≈ $147.8m 2025-05-15
FMR LLC 13G · institution +1.3 pts · filed 2025-08-06 8.2% +1.3 pts 5.1m≈ $136.9m 2025-08-06
RA CAPITAL MANAGEMENT, L.P. 13G · passive investor -5.3 pts · filed 2026-08-14 7.1% -5.3 pts 4.9m≈ $130.2m 2026-08-14

Fell to 5% or below in the last year: Terwey Theis H (2.9%, 2025-11-14)

Insider purchases and sales since 1 Apr 2026

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.

None reported since 1 Apr 2026.

Holders, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 Lynx1 Capital Management LP 41.19% of their portfolio DORADO, PR 13,263,28813.3m $356.5m $356.5m 41.19% Added +2.5m +2,500,000
2 BVF INC/IL 5.95% of their portfolio San Francisco, CA 8,650,1588.7m $232.5m $232.5m 5.95% Unchanged
3 RA CAPITAL MANAGEMENT, L.P. 1.78% of their portfolio BOSTON, MA 7,636,8137.6m $205.3m $205.3m 1.78% Reduced -39.9k -39,884
4 FMR LLC 0.01% of their portfolio BOSTON, MA 5,977,0456.0m $160.7m $160.7m 0.01% Added +841.0k +841,000
5 RTW INVESTMENTS, LP 1.36% of their portfolio NEW YORK, NY 5,933,8155.9m $159.5m $159.5m 1.36% Unchanged
6 Deep Track Capital, LP 1.32% of their portfolio GREENWICH, CT 3,333,3343.3m $89.6m $89.6m 1.32% New
7 Avoro Capital Advisors LLC 0.43% of their portfolio NEW YORK, NY 1,800,0001.8m $48.4m $48.4m 0.43% Unchanged
8 Foresite Capital Management VI LLC 3.93% of their portfolio WEST HOLLYWOOD, CA 940,493940.5k $25.3m $25.3m 3.93% Added +625.0k +625,001
9 Jefferies Financial Group Inc. 0.18% of their portfolio NEW YORK, NY 712,300712.3k $19.1m $19.1m 0.18% Unchanged
10 BlackRock, Inc. 0.00% of their portfolio New York, NY 480,287480.3k $12.9m $12.9m 0.00% Added +24.7k +24,669
11 UBS Group AG 0.00% of their portfolio ZURICH, V8 477,408477.4k $12.8m $12.8m 0.00% Added +65.0k +64,992
12 MILLENNIUM MANAGEMENT LLC 0.01% of their portfolio NEW YORK, NY 323,399323.4k $8.7m $8.7m 0.01% Reduced -614.5k -614,499
13 BRAIDWELL LP 0.21% of their portfolio STAMFORD, CT 207,240207.2k $5.6m $5.6m 0.21% New
14 BOOTHBAY FUND MANAGEMENT, LLC 0.10% of their portfolio NEW YORK, NY 202,103202.1k $5.4m $5.4m 0.10% Reduced -80.8k -80,788
15 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 169,951170.0k $4.6m $4.6m 0.00% New
16 HighVista Strategies LLC 0.97% of their portfolio BOSTON, MA 158,770158.8k $4.3m $4.3m 0.97% Reduced -54.4k -54,442
17 Trexquant Investment LP 0.03% of their portfolio STAMFORD, CT 153,767153.8k $4.1m $4.1m 0.03% Added +84.0k +83,959
18 GOLDMAN SACHS GROUP INC 0.00% of their portfolio NEW YORK, NY 148,673148.7k $4.0m $4.0m 0.00% Added +103.9k +103,878
19 XTX Topco Ltd 0.03% of their portfolio LONDON, X0 86,98687.0k $2.3m $2.3m 0.03% Added +34.9k +34,896
20 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 85,95286.0k $2.3m $2.3m 0.00% Added +20.5k +20,488
21 AdvisorShares Investments LLC 0.23% of their portfolio BETHESDA, MD 71,26771.3k $1.9m $1.9m 0.23% Added +4.2k +4,233
22 CenterBook Partners LP 0.09% of their portfolio GREENWICH, CT 69,43669.4k $1.9m $1.9m 0.09% Reduced -147.1k -147,138
23 HRT FINANCIAL LP 0.00% of their portfolio NEW YORK, NY 65,37565.4k $1.8m $1.8m 0.00% New
24 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 52,21852.2k $1.4m $1.4m 0.00% Added +26.4k +26,388
25 Point72 Asset Management, L.P. 0.00% of their portfolio STAMFORD, CT 50,88250.9k $1.4m $1.4m 0.00% New
26 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 46,69746.7k $1.3m $1.3m 0.00% Reduced -44.4k -44,411
27 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 43,94843.9k $1.2m $1.2m 0.00% New
28 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 40,48340.5k $1.1m $1.1m 0.00% Unchanged
29 Axxion S.A. 0.07% of their portfolio GREVENMACHER, N4 36,17036.2k $972.2k $972.2k 0.07% First filing
30 TUDOR INVESTMENT CORP ET AL 0.00% of their portfolio STAMFORD, CT 34,27834.3k $921.4k $921.4k 0.00% Added +15.7k +15,718
31 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 31,84431.8k $856.0k $856.0k 0.00% Reduced -841 -841
32 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 25,34525.3k $681.3k $681.3k 0.00% New
33 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 21,11721.1k $567.6k $567.6k 0.00% New
34 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 18,77818.8k $535.0k $535.0k 0.00% Reduced -75 -75
35 Squarepoint Ops LLC 0.00% of their portfolio NEW YORK, NY 18,43018.4k $495.4k $495.4k 0.00% New
36 Virtus Investment Advisers, LLC 0.10% of their portfolio HARTFORD, CT 15,49215.5k $416.4k $416.4k 0.10% Reduced -5.4k -5,428
37 LETKO, BROSSEAU & ASSOCIATES INC 0.01% of their portfolio MONTREAL, A8 15,42515.4k $414.6k $414.6k 0.01% New
38 China Universal Asset Management Co., Ltd. 0.02% of their portfolio SHANGHAI, F4 13,41913.4k $360.7k $360.7k 0.02% Reduced -88 -88
39 HighTower Advisors, LLC 0.00% of their portfolio CHICAGO, IL 12,70012.7k $341.4k $341.4k 0.00% Reduced -2.9k -2,900
40 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 11,16311.2k $300.1k $300.1k 0.00% Added +114 +114
41 Lion Point Capital, LP 1.31% of their portfolio NEW YORK, NY 10,20010.2k $274.2k $274.2k 1.31% Unchanged
42 Eversept Partners, LP 0.01% of their portfolio NEW YORK, NY 8,6728.7k $233.1k $233.1k 0.01% New
43 HSBC HOLDINGS PLC 0.00% of their portfolio LONDON, X0 7,8477.8k $216.4k $216.4k 0.00% New
44 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 5,9776.0k $160.7k $160.7k 0.00% Added +1.6k +1,583
45 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 5,8775.9k $158.0k $158.0k 0.00% Added +3.3k +3,287
46 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 5,7755.8k $155.2k $155.2k 0.00% Reduced -150 -150
47 SIMPLEX TRADING, LLC 0.00% of their portfolio CHICAGO, IL 4,7394.7k $127.4k $127.4k 0.00% Added +4.7k +4,656
48 Mirae Asset Global Investments Co., Ltd. 0.00% of their portfolio SEOUL, M5 3,0683.1k $82.5k $82.5k 0.00% Reduced -167 -167
49 North Star Investment Management Corp. 0.00% of their portfolio CHICAGO, IL 2,2002.2k $59.1k $59.1k 0.00% Unchanged
50 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 1,6971.7k $45.6k $45.6k 0.00% Added +387 +387
51 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 1,6141.6k $43.4k $43.4k 0.00% Reduced -119 -119
52 GF FUND MANAGEMENT CO. LTD. 0.00% of their portfolio GUANGZHOU, F4 1,3151.3k $35.3k $35.3k 0.00% Reduced -69 -69
53 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 1,2501.2k $33.6k $33.6k 0.00% Unchanged
54 HARBOUR INVESTMENTS, INC. 0.00% of their portfolio MADISON, WI 800800 $21.5k $21.5k 0.00% New
55 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 775775 $21.9k $21.9k 0.00% New
56 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 515515 $13.8k $13.8k 0.00% Reduced -150 -150
57 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 411411 $11.0k $11.0k 0.00% Added +391 +391
58 Ancora Advisors LLC 0.00% of their portfolio Cleveland, OH 284284 $7.6k $7.6k 0.00% Unchanged
59 HOLLENCREST CAPITAL MANAGEMENT 0.00% of their portfolio NEWPORT BEACH, CA 250250 $6.7k $6.7k 0.00% New
60 Federation des caisses Desjardins du Quebec 0.00% of their portfolio LEVIS, A8 205205 $5.5k $5.5k 0.00% New
61 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 100100 $2.7k $2.7k 0.00% Unchanged
62 Cornerstone Financial Management LLC 0.00% of their portfolio BURLINGTON, MA 3232 $860 $860 0.00% Unchanged
63 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 1919 $511 $511 0.00% New