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GOSS · Gossamer Bio, Inc.

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$0.15 0.00 (-1.78%) At close · Aug 21
Market Cap
$73.08M
Shares
488.85M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 173
Total Value: $61,411,259
Total Shares: 372,190,058

Institutional Ownership Trend

26 quarters

Holder Concentration

Across 173 13F filers · Δ vs Mar 31, 2026
Top Holder
11.0%
Sep 2023 → Jun 2026 · range 7.5% – 11.0%
+1.1 pts
Top 5
46.2%
Sep 2023 → Jun 2026 · range 25.4% – 46.2%
+15.5 pts
Top 10
64.0%
Sep 2023 → Jun 2026 · range 41.6% – 64.0%
+15.1 pts
HHI
556
Sep 2023 → Jun 2026 · range 315 – 556
Broadly held+197

Quarterly Activity

vs Mar 31, 2026
New
27
Increased
63
Decreased
47
Sold Out
47
Unchanged
36
Holder count: -20
Institutional value: +9.5%
Shares held: +118.4%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 176
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1728117 CUSIP 38341P102 13F (30d) 157 filings 154 filers Visit website