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Gossamer Bio, Inc. (GOSS) institutional ownership

Latest close $0.15 Jul 21, 2026
Market cap$787M 52-week range SectorHealthcare
Funds holding · Q1 2026
213
reported GOSS position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q1 2026
Activity unavailable N/A
113 buyers · 100 sellers

Gossamer Bio, Inc. (GOSS) price and institutional activity

Dates

Q1 2026

$0 bought by 113 investors
Kalehua Capital Management LLCAQR Capital Management LLC +111 more
$0 sold by 100 investors
Nea Management Company, LLCOctagon Capital Advisors LP +98 more
Bought Sold Totals per quarter; hover a bar for the names.

Gossamer Bio, Inc. (GOSS) institutional activity · 213

Investor Type Est. change Change Δ Own Date
Nea Management Company, LLC · Reduced
Change −17.1M Date Q1 2026
Nea Management Company, LLC Reduced· Q1 2026 −17.1M Q1 2026
Kalehua Capital Management LLC · New
Change +10.2M Date Q1 2026
Kalehua Capital Management LLC New· Q1 2026 +10.2M Q1 2026
AQR Capital Management LLC · Added
Change +9.0M Date Q1 2026
AQR Capital Management LLC Added· Q1 2026 +9.0M Q1 2026
Octagon Capital Advisors LP · Reduced
Change −6.2M Date Q1 2026
Octagon Capital Advisors LP Reduced· Q1 2026 −6.2M Q1 2026
State Street · Reduced
Change −4.9M Date Q1 2026
State Street Reduced· Q1 2026 −4.9M Q1 2026
Palo Alto Investors LP · Exited
Change −4.5M Δ Own −100.0% Date Q1 2026
Palo Alto Investors LP Exited· Q1 2026 −4.5M −100.0% Q1 2026
Balyasny Asset Management L.P. · Added
Change +4.4M Date Q1 2026
Balyasny Asset Management L.P. Added· Q1 2026 +4.4M Q1 2026
Qube Research & Technologies Ltd · Added
Change +4.4M Date Q1 2026
Qube Research & Technologies Ltd Added· Q1 2026 +4.4M Q1 2026
FMR LLC · Reduced
Change −4.2M Δ Own −99.5% Date Q1 2026
FMR LLC Reduced· Q1 2026 −4.2M −99.5% Q1 2026
Millennium Management LLC · Reduced
Change −3.4M Date Q1 2026
Millennium Management LLC Reduced· Q1 2026 −3.4M Q1 2026
Gsa Capital Partners LLP · Added
Change +3.2M Date Q1 2026
Gsa Capital Partners LLP Added· Q1 2026 +3.2M Q1 2026
Squarepoint Ops LLC · Added
Change +3.2M Date Q1 2026
Squarepoint Ops LLC Added· Q1 2026 +3.2M Q1 2026
Perceptive Advisors LLC · Exited
Change −3.1M Δ Own −100.0% Date Q1 2026
Perceptive Advisors LLC Exited· Q1 2026 −3.1M −100.0% Q1 2026
Opaleye Management Inc. · Exited
Change −2.7M Δ Own −100.0% Date Q1 2026
Opaleye Management Inc. Exited· Q1 2026 −2.7M −100.0% Q1 2026
Two Sigma Advisers, LP · Exited
Change −2.6M Δ Own −100.0% Date Q1 2026
Two Sigma Advisers, LP Exited· Q1 2026 −2.6M −100.0% Q1 2026
Data through Q1 2026 · filed Jun 1, 2026
15 of 213

Famous investor activity in Gossamer Bio, Inc. (GOSS)

Gossamer Bio, Inc. (GOSS) insider trading

Company insiders, action and economics first; trade and filed dates last.
Dates
Insider Title Type Price Qty Value Owned ΔOwn Trade date Filed date
Quisel John D. · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Quisel John D. Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Drynan Skye · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Drynan Skye Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Daniel Thomas O. · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Daniel Thomas O. Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Cox Russell J. · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Cox Russell J. Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Milligan Sandra · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Milligan Sandra Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Nathan Steven D. · Director Grant (A) 115K
Owned 115K Trade date Jun 4, 2026 Filed date Jun 5, 2026
Nathan Steven D. Director Grant (A) 115K 115K Jun 4, 2026 Jun 5, 2026
Aranda Richard · Officer 12 operations -2.3M
Owned 0 Trade date Mar 19, 2026 Filed date Mar 20, 2026
Aranda Richard Officer 12 operations -2.3M 0 Mar 19, 2026 Mar 20, 2026
Aranda Richard · Officer 12 operations 2.3M
Owned 127K Trade date Mar 19, 2026 Filed date Mar 20, 2026
Aranda Richard Officer 12 operations 2.3M 127K Mar 19, 2026 Mar 20, 2026
Peterson Caryn · Officer 12 operations -2.0M
Owned 0 Trade date Mar 19, 2026 Filed date Mar 20, 2026
Peterson Caryn Officer 12 operations -2.0M 0 Mar 19, 2026 Mar 20, 2026
Peterson Caryn · Officer 12 operations 2.0M
Owned 21K Trade date Mar 19, 2026 Filed date Mar 20, 2026
Peterson Caryn Officer 12 operations 2.0M 21K Mar 19, 2026 Mar 20, 2026
Smith Robert Paul Jr · Officer 2 operations -1.1M
Owned 0 Trade date Mar 19, 2026 Filed date Mar 20, 2026
Smith Robert Paul Jr Officer 2 operations -1.1M 0 Mar 19, 2026 Mar 20, 2026
Smith Robert Paul Jr · Officer 2 operations 1.1M
Owned 572K Trade date Mar 19, 2026 Filed date Mar 20, 2026
Smith Robert Paul Jr Officer 2 operations 1.1M 572K Mar 19, 2026 Mar 20, 2026
Hasnain Faheem · Director, Officer 10 operations -7.1M
Owned 0 Trade date Mar 19, 2026 Filed date Mar 20, 2026
Hasnain Faheem Director, Officer 10 operations -7.1M 0 Mar 19, 2026 Mar 20, 2026
Hasnain Faheem · Director, Officer 10 operations 7.1M
Owned 44K Trade date Mar 19, 2026 Filed date Mar 20, 2026
Hasnain Faheem Director, Officer 10 operations 7.1M 44K Mar 19, 2026 Mar 20, 2026
Giraudo Bryan · Officer 11 operations -3.0M
Owned 0 Trade date Mar 19, 2026 Filed date Mar 20, 2026
Giraudo Bryan Officer 11 operations -3.0M 0 Mar 19, 2026 Mar 20, 2026
15 of 31
15 of 31 Sign in to continue to older insider transactions.

Gossamer Bio, Inc. (GOSS) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
683 Capital Management, LLC 49.9M
% of shares outstanding 10.0% Filing date Jun 11, 2026
683 Capital Management, LLC 49.9M 10.0% Jun 11, 2026
Context Capital Management, LLC 48.8M
% of shares outstanding 9.9% Filing date Jun 9, 2026
Context Capital Management, LLC 48.8M 9.9% Jun 9, 2026
Deepcurrents Investment Group LLC 37.7M
% of shares outstanding 7.7% Filing date Jun 11, 2026
Deepcurrents Investment Group LLC 37.7M 7.7% Jun 11, 2026
BlackRock Inc. 4.7M
% of shares outstanding 4.9% Filing date May 5, 2023
BlackRock Inc. 4.7M 4.9% May 5, 2023
Octagon Capital Advisors LP 9.0M
% of shares outstanding 3.8% Filing date May 14, 2026
Octagon Capital Advisors LP 9.0M 3.8% May 14, 2026
Invus Public Equities, L.P. 6.3M
% of shares outstanding 2.8% Filing date Feb 12, 2025
Invus Public Equities, L.P. 6.3M 2.8% Feb 12, 2025
State Street Corp
% of shares outstanding 1.4% Filing date May 10, 2023
State Street Corp 1.4% May 10, 2023
The Vanguard Group 0
% of shares outstanding 0.0% Filing date Mar 27, 2026
The Vanguard Group 0 0.0% Mar 27, 2026
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Gossamer Bio, Inc. (GOSS) ownership FAQ

Who owns GOSS?

213 reporting institutions disclosed GOSS position changes in the Q1 2026 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q1 2026.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.