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Buy Day today: Neutral (51) Mixed market breadth · no major macro event
GOSS

Gossamer Bio Inc

Healthcare · Biotechnology

10.70$ -10.1% vs. previous close Closing price · As of: Sep 18, 2026

Ownership

Ownership Structure

Who owns Gossamer Bio Inc (GOSS)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 62.7% of the shares are freely tradable; institutional investors hold 75.2%.

Institutional ownership ?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings. 75.2%
Insiders ?Share of the stock held by the executives, founders and major shareholders of the company itself. 1.7%
Float ?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders. 62.7%
Short % of float ?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices. 0.2%
Shares Outstanding ?Total number of shares issued. Price times share count gives market cap. 6Mio.

Largest Shareholders

Institutions

Institutions GOSS
Name Stake (%) Shares Change (%) Date
D. E. Shaw & Co LP 8.38 40,959,285 +10,417.7 06/30/2026
Worth Venture Partners, LLC 5.12 25,017,881 +0.0 06/30/2026
Kalehua Capital Management LLC 3.62 17,708,133 +0.0 03/31/2026
BlackRock Inc 3.44 16,826,695 -1.3 03/31/2026
GSA Capital Partners LLP 3.07 14,986,947 +360.5 06/30/2026
AQR Capital Management LLC 2.07 10,126,897 +804.8 03/31/2026
Vanguard Capital Management, LLC 1.92 9,394,593 +0.0 03/31/2026
ARCH VENTURE CORP 1.65 8,055,916 +0.0 06/30/2026
Octagon Capital Advisors LP 1.59 7,750,000 +0.0 06/30/2026

Funds

Funds GOSS
Name Stake (%) Shares Change (%) Date
Vanguard MStar Total Stk Mkt Idx Invest 2.96 6,910,934 +0.0 07/31/2026

Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.

Data as of: September 18, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)

Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.

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