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Gossamer Bio, Inc.

GOSS
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
SEC CIK
0001728117

No open-market purchases or sales by Gossamer Bio, Inc. insiders were filed in the last 90 days; 171 institutions reported holding it in 13F filings for Q2 2026, worth $60.8M in total; HHLR Advisors (Hillhouse) is the only superinvestor holding it.

Holders of 5% or more of GOSS

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Gossamer Bio, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of GOSS
HolderLatest formStakeChangeFirst filedLatest filingFiling
FMR LLC13G10.90%667.5K shares–Feb 9, 20243 filingsNov 6, 2026SEC
683 Capital Management, LLC13G9.99%49.9M shares+6.09 ppfrom 3.90%Mar 2, 20263 filingsJun 11, 2026SEC
Context Capital Management, LLC13G9.90%48.8M sharesNewJun 9, 20261 filingJun 9, 2026SEC
DeepCurrents Investment Group LLC13G7.70%37.7M sharesNewJun 11, 20261 filingJun 11, 2026SEC
Opaleye Management Inc.13G/A6.98%427.0K shares+1.88 ppfrom 5.10%Jul 29, 20262 filingsNov 6, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

50 Schedule 13D and 13G filings on Gossamer Bio, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on GOSS
Filed (ET)FilerFormStakeChangeEvent dateFiling
Nov 6, 20264:05 PM ETOpaleye Management Inc.and 2 others13G/A6.98%427.0K shares+1.88 ppfrom 5.10%Sep 30, 2026SEC
Nov 6, 20269:45 AM ETFMR LLCand 1 other13G10.90%667.5K shares–Oct 30, 2026SEC
Oct 29, 20267:47 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A4.20%255.4K shares−1.80 ppfrom 6.00%Below 5%Oct 27, 2026SEC
Oct 8, 20268:59 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A6.00%369.5K shares+0.90 ppfrom 5.10%Oct 6, 2026SEC
Sep 28, 20267:49 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A5.10%312.0K shares−0.90 ppfrom 6.00%Sep 24, 2026SEC
Aug 24, 20268:11 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A6.00%29.1M shares−1.10 ppfrom 7.10%Aug 20, 2026SEC
Jul 29, 20264:05 PM ETOpaleye Management Inc.and 2 others13G5.10%24.9M sharesNewJul 22, 2026SEC
Jul 29, 20263:19 PM ETBlackRock, Inc.13G/A1.00%4.89M shares−5.50 ppfrom 6.50%Below 5%Jun 30, 2026SEC
Jul 24, 20269:14 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A7.10%34.6M shares−1.20 ppfrom 8.30%Jul 22, 2026SEC
Jul 1, 20269:23 PM ETD. E. Shaw & Co, L.P.and 3 others13D/A8.30%40.6M shares−1.20 ppfrom 9.50%Jun 29, 2026SEC
Jun 11, 20269:13 PM ETD. E. Shaw & Co, L.P.and 3 others13D9.50%46.5M sharesNewJun 4, 2026SEC
Jun 11, 20268:10 PM ETDeepCurrents Investment Group LLCand 3 others13G7.70%37.7M sharesNewJun 4, 2026SEC
Jun 11, 20264:54 PM ET683 Capital Management, LLCand 2 others13G9.99%49.9M shares+6.09 ppfrom 3.90%Jun 4, 2026SEC
Jun 9, 20268:44 AM ETContext Capital Management, LLCand 4 others13G9.90%48.8M sharesNewJun 4, 2026SEC
May 14, 20264:01 PM ETOctagon Capital Advisors LPand 2 others13G/A3.80%8.98M shares−2.70 ppfrom 6.50%Below 5%Mar 31, 2026SEC
Mar 27, 20269:31 AM ETVanguard Group Inc13G/A0.00%0 shares−5.02 ppfrom 5.02%Below 5%Mar 13, 2026SEC
Mar 24, 20264:48 PM ET683 Capital Management, LLCand 2 others13G/A3.90%9.33M shares−1.33 ppfrom 5.23%Below 5%Mar 18, 2026SEC
Mar 2, 202611:57 AM ET683 Capital Management, LLCand 2 others13G5.23%12.3M sharesNewFeb 23, 2026SEC
Feb 24, 20267:21 PM ETGrowth Equity Opportunities 18 VGE, LLCand 11 others13D/A1.70%4.07M shares–Below 5%Feb 23, 2026SEC
Feb 17, 20264:02 PM ETOctagon Capital Advisors LPand 2 others13G/A6.50%15.1M shares−2.10 ppfrom 8.60%Dec 31, 2025SEC
Jan 21, 202612:30 PM ETBlackRock, Inc.13G/A6.50%15.1M shares+1.20 ppfrom 5.30%Dec 31, 2025SEC
Jul 29, 20251:34 PM ETVanguard Group Inc13G5.02%11.4M shares+0.60 ppfrom 4.42%Jun 30, 2025SEC
Jul 17, 20257:54 PM ETBlackRock, Inc.13G5.30%12.1M sharesNewJun 30, 2025SEC
Feb 12, 20254:30 PM ETInvus Global Management, LLCand 7 others13G/A2.80%6.26M shares–Below 5%Dec 31, 2024SEC
Feb 5, 20256:28 PM ETOctagon Capital Advisors LPand 2 others13G8.60%19.6M sharesNewDec 31, 2024SEC
Jan 30, 20259:57 PM ETVanguard Group Inc13G/A4.42%10.0M shares–Below 5%Dec 31, 2024SEC
Nov 12, 2024Invus Global Management, LLC13G/AOld format–––SEC
Nov 12, 2024FMR LLC13G/AOld format–––SEC
Aug 2, 2024Invus Global Management, LLC13G/AOld format–––SEC
Feb 14, 2024Hillhouse Investment Management, Ltd.13G/AOld format–––SEC
Feb 13, 2024Vanguard Group Inc13G/AOld format–––SEC
Feb 9, 2024ARCH Venture Fund IX, L.P.13G/AOld format–––SEC
Feb 9, 2024FMR LLC13GOld format–New–SEC
Jan 11, 2024Millennium Management LLC13G/AOld format–––SEC
Jan 11, 2024Artal International S.C.A.13GOld format–New–SEC
Jul 28, 2023Growth Equity Opportunities 18 VGE, LLC13DOld format–New–SEC
May 10, 2023State Street Corp13G/AOld format–––SEC
May 5, 202311:52 AM ETBlackRock Inc.13G/AOld format–––SEC
Feb 14, 2023HHLR Advisors, Ltd.SuperinvestorHHLR Advisors (Hillhouse)13G/AOld format–––SEC
Feb 9, 2023Vanguard Group Inc13G/AOld format–––SEC
Feb 1, 20234:54 PM ETBlackRock Inc.13G/AOld format–––SEC
Jan 10, 2023State Street Corp13GOld format–New–SEC
Jan 4, 2023Millennium Management LLC13GOld format–––SEC
Dec 20, 2022Millennium Management LLC13GOld format–New–SEC
Feb 10, 2022Vanguard Group Inc13G/AOld format–––SEC
Feb 3, 20224:41 PM ETBlackRock Inc.13G/AOld format–––SEC
Feb 16, 2021HHLR Advisors, Ltd.SuperinvestorHHLR Advisors (Hillhouse)13G/AOld format–––SEC
Feb 12, 2021Omega Fund V, L.P.13G/AOld format–––SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Feb 2, 20212:56 PM ETBlackRock Inc.13GOld format–New–SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Gossamer Bio, Inc. shares.

No Form 144 notices for Gossamer Bio, Inc. are on file.