Gossamer Bio, Inc. (GOSS)
Nasdaq: GOSS · Pharmaceutical Preparations · San Diego, CA · filing with the SEC since 2018
Who owns Gossamer Bio, Inc.
As filed with the SECHolders of 5% or more
5
683 Capital Management, LLC holds 9.99% of Common Stock, $0.0001 par value, as its SCHEDULE 13G filed Jun 11, 2026 says.
Directors and officers
13
report now, of 21 people on the record since 2019. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 5 named at left.
Holders of 5% or moreshare of the class, as filed
683 Capital Management, LLC
SCHEDULE 13G · filed Jun 11, 2026 · Common Stock, $0.0001 par value · 3.9% in Mar 24, 2026
Context Capital Management, LLC
SCHEDULE 13G · filed Jun 9, 2026 · Common Stock, $0.0001 par value per share
DeepCurrents Investment Group LLC
SCHEDULE 13G · filed Jun 11, 2026 · Common Stock, $0.0001 par value per share
D. E. Shaw & Co., L.L.C.
SCHEDULE 13D/A · filed Oct 8, 2026 · Common Stock, $0.0001 par value per share · 5.1% in Sep 28, 2026
Opaleye Management Inc.
SCHEDULE 13G · filed Jul 29, 2026 · Common Stock, par value $0.0001 per share
Octagon Capital Advisors LP
SCHEDULE 13G/A · filed May 14, 2026 · Common Stock, $0.0001 par value · reported falling below 5%, from 6.5% in Feb 17, 2026
Invus Public Equities, L.P.
SCHEDULE 13G/A · filed Feb 12, 2025 · Common Stock, par value $0.0001 per share · reported falling below 5%
Growth Equity Opportunities 18 VGE, LLC
SCHEDULE 13D/A · filed Feb 24, 2026 · Common Stock, $0.0001 par value per share · reported falling below 5%
Blackrock, Inc.
SCHEDULE 13G/A · filed Jul 29, 2026 · Common Stock · reported falling below 5%, from 6.5% in Jan 21, 2026
The Vanguard Group
SCHEDULE 13G/A · filed Mar 27, 2026 · Common Stock · reported falling below 5%, from 5.02% in Jul 29, 2025
What GOSS reports owning in othersstakes of 5% or more, and other ties
4 subsidiaries in 2 countries, from the list filed with the 10-K filed Mar 17, 2026.
Insider tradesForm 4
0sales
0purchases
0sales on a scheduled plan
0people selling
$0sold, in dollars
$0bought, in dollars
Open-market trades on Form 4 from Sep 30, 2025 to Sep 30, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2025 runs to Sep 30, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window
No one on the roster filed an open-market trade in the window.