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Gossamer Bio, Inc. 13F holders

None of the 44 funds followed here reported a position in Gossamer Bio, Inc. in its latest 13F.

Schedule 13D and 13G filed on the name, last twelve months

FiledScheduleWhoHoldingOf the classEvent dateRule or purposeFiling
8 October 202613D/AD. E. Shaw Valence Portfolios, L.L.C. and 3 others369,4596.0%6 October 2026EDGAR
28 September 202613D/AD. E. Shaw Valence Portfolios, L.L.C. and 3 others312,0485.1%24 September 2026Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following at the end of the section entitled "Voting Agreements": On July 14, 2026, shareholders approved the Shareholder Proposals (i) through (iv). Subsequently, EDGAR
24 August 202613D/AD. E. Shaw Valence Portfolios, L.L.C. and 3 others29.1 million6.0%20 August 2026EDGAR
29 July 202613G/ABlackRock, Inc. and 1 other4.9 million1.0%30 June 2026passive, institutional (13d-1(b))EDGAR
29 July 202613GOpaleye Management Inc. and 5 others24.9 million5.1%22 July 2026passive, under 20% (13d-1(c))EDGAR
24 July 202613D/AD. E. Shaw Valence Portfolios, L.L.C. and 3 others34.6 million7.1%22 July 2026EDGAR
1 July 202613D/AD. E. Shaw Valence Portfolios, L.L.C. and 3 others40.6 million8.3%29 June 2026EDGAR
11 June 202613G683 Capital Management, LLC and 5 others49.9 million10.0%4 June 2026passive, under 20% (13d-1(c))EDGAR
11 June 202613DD. E. Shaw Valence Portfolios, L.L.C. and 3 others46.5 million9.5%4 June 2026The information set forth in Item 3 of this Schedule 13D is incorporated herein by reference. Summary of May 18, 2026 Agreements On May 18, 2026, the Issuer commenced an exchange offer (the "Exchange Offer") to exchange any and all of its 5EDGAR
11 June 202613GDeepCurrents Investment Group LLC and 7 others37.7 million7.7%4 June 2026passive, under 20% (13d-1(c))EDGAR
9 June 202613GContext Capital Management, LLC and 9 others48.8 million9.9%4 June 2026passive, under 20% (13d-1(c))EDGAR
14 May 202613G/AOctagon Capital Advisors LP and 5 others9.0 million3.8%31 March 2026passive, institutional (13d-1(b))EDGAR
27 March 202613G/AThe Vanguard Group and 1 other00.0%13 March 2026passive, institutional (13d-1(b))EDGAR
24 March 202613G/A683 Capital Management, LLC and 5 others9.3 million3.9%18 March 2026passive, under 20% (13d-1(c))EDGAR
2 March 202613G683 Capital Management, LLC and 5 others12.3 million5.2%23 February 2026passive, under 20% (13d-1(c))EDGAR
24 February 202613D/AGrowth Equity Opportunities 18 VGE, LLC and 11 others4.1 million1.7%23 February 2026On February 23, 2026, GEO completed open market sales as part of a series of public sales whereby GEO sold in the aggregate 17,093,034 shares of Common stock at a weighted average price of $0.3906 per share, with prices that ranged from $0.EDGAR
17 February 202613G/AOctagon Capital Advisors LP and 5 others15.1 million6.5%31 December 2025passive, institutional (13d-1(b))EDGAR
21 January 202613G/ABlackRock, Inc. and 1 other15.1 million6.5%31 December 2025passive, institutional (13d-1(b))EDGAR
A Schedule 13D is filed by anyone who crosses 5% of a class with intent to influence; a 13G by a passive holder.
Read moreAmendments (/A) report a change, including an exit to zero. Holding and percentage are as the filer stated them on the cover page; the purpose is the filer's own words, cut short. 13D and 13G

Fails to deliver

Settlement dateShares failedPriceFile
28 September 2026133$10.94SEC
25 September 202617$10.93SEC
24 September 20262$10.99SEC
23 September 20261,752$11.69SEC
22 September 20269,943$11.28SEC
21 September 20266,487$10.73SEC
18 September 20266,152$11.94SEC
17 September 20261,932$10.96SEC
16 September 20262,012$10.38SEC
15 September 20263,544$10.70SEC
14 September 20266,311$10.73SEC
11 September 20263,535,808$0.14SEC
10 September 20262,000$0.16SEC
8 September 202626,877$0.18SEC
4 September 2026308,145$0.18SEC
3 September 20268,504$0.17SEC
2 September 20262,924$0.17SEC
1 September 202625,701$0.17SEC
31 August 2026900$0.17SEC
27 August 20267,010$0.17SEC
24 August 2026617,017$0.15SEC
21 August 202623,949$0.16SEC
20 August 202631,111$0.16SEC
19 August 2026687,597$0.14SEC
18 August 20261,099,871$0.14SEC
17 August 20261,355$0.15SEC
Shares that failed to deliver at settlement, per day, from the SEC's half-month files, which arrive about two weeks after the period.
Read moreLargest in the window: 3,535,808 on 11 September 2026. A fail is an operational fact about settlement, not a position.