Company · Ownership research

Gossamer Bio, Inc. GOSS

CIK 0001728117 · CUSIP 38341P102

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 38341P102 (GOSS), not CUSIP 38341P902 (GOSS), CUSIP 38341P952 (GOSS), and does not merge CUSIPs.

This page lists the top 20 of 120 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	Octagon Capital Advisors LP CIK 1839435 · Amended · View history	$20.18M 18,350,000 shares	3.97%	0(0.00%)Unchanged	SEC filing ↗ May 16, 2025	▾
02	NEA Management Company, LLC CIK 1512848 · View history	$19.90M 18,093,034 shares	1.53%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2025	▾
03	VANGUARD GROUP INC CIK 102909 · View history	$11.09M 10,083,881 shares	0.00%	+49.73K(+0.50%)Added	SEC filing ↗ May 9, 2025	▾
04	ARCH Venture Management, LLC CIK 1274403 · View history	$8.78M 8,055,916 shares	4.26%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
05	FMR LLC CIK 315066 · View history	$8.35M 7,592,980 shares	0.00%	-340.02K(-4.30%)Reduced	SEC filing ↗ May 12, 2025	▾
06	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$6.99M 6,358,113 shares	0.02%	+1.25M(+24.60%)Added	SEC filing ↗ May 21, 2025	▾
07	SILVERARC CAPITAL MANAGEMENT, LLC CIK 1816307 · View history	$6.95M 6,320,684 shares	1.45%	+148.84K(+2.40%)Added	SEC filing ↗ May 14, 2025	▾
08	Palo Alto Investors LP CIK 1306923 · View history	$6.90M 6,276,893 shares	1.31%	-200(0.00%)Reduced	SEC filing ↗ May 15, 2025	▾
09	Samsara BioCapital, LLC CIK 1744967 · View history	$6.74M 6,130,268 shares	1.20%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
10	683 Capital Management, LLC CIK 1404574 · View history	$6.71M 6,100,000 shares	0.68%	-875.00K(-12.50%)Reduced	SEC filing ↗ May 15, 2025	▾
11	Siren, L.L.C. CIK 2005245 · Amended · View history	$5.73M 5,208,968 shares	0.32%	0(0.00%)Unchanged	SEC filing ↗ May 23, 2025	▾
12	HHLR ADVISORS, LTD. CIK 1762304 · View history	$5.47M 4,974,041 shares	0.15%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
13	Monaco Asset Management SAM CIK 1803593 · View history	$5.33M 4,849,134 shares	2.70%	-522.51K(-9.70%)Reduced	SEC filing ↗ May 8, 2025	▾
14	Opaleye Management Inc. CIK 1595855 · View history	$4.72M 4,287,415 shares	1.05%	-202.59K(-4.50%)Reduced	SEC filing ↗ May 15, 2025	▾
15	Alyeska Investment Group, L.P. CIK 1453072 · View history	$4.58M 4,163,734 shares	0.02%	-4.64M(-52.70%)Reduced	SEC filing ↗ May 15, 2025	▾
16	Eversept Partners, LP CIK 1697013 · View history	$4.29M 3,896,841 shares	0.49%	-1.08M(-21.70%)Reduced	SEC filing ↗ May 15, 2025	▾
17	Corient Private Wealth LLC CIK 1948780 · View history	$3.73M 3,391,483 shares	0.01%	0(0.00%)Unchanged	SEC filing ↗ May 14, 2025	▾
18	Rock Springs Capital Management LP CIK 1595725 · View history	$3.59M 3,266,960 shares	0.21%	0(0.00%)Unchanged	SEC filing ↗ May 15, 2025	▾
19	BlackRock, Inc. CIK 2012383 · View history	$3.38M 3,072,773 shares	0.00%	+43.56K(+1.40%)Added	SEC filing ↗ May 2, 2025	▾
20	SUSQUEHANNA INTERNATIONAL GROUP, LLP CIK 1446194 · View history	$3.21M 2,916,109 shares	0.01%	+2.34M(+404.60%)Added	SEC filing ↗ May 14, 2025	▾

Showing 20 / 120 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

120

Cancelled or null records excluded

Disclosed shares

169,972,861

Not deduplicated across managers

Disclosed value

$186.89M

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

Gossamer Bio, Inc. · Q1 2025

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.