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 195 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	NEA Management Company, LLC CIK 1512848 · View history	$56.09M 18,093,034 shares	2.86%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
02	BlackRock, Inc. CIK 2012383 · View history	$52.88M 17,056,878 shares	0.00%	+3.21M(+23.20%)Added	SEC filing ↗ Feb 12, 2026	▾
03	Octagon Capital Advisors LP CIK 1839435 · View history	$43.14M 13,915,371 shares	5.40%	-3.13M(-18.40%)Reduced	SEC filing ↗ Feb 17, 2026	▾
04	VANGUARD GROUP INC CIK 102909 · View history	$39.91M 12,873,209 shares	0.00%	+863.44K(+7.20%)Added	SEC filing ↗ Jan 29, 2026	▾
05	STATE STREET CORP CIK 93751 · View history	$28.86M 9,310,969 shares	0.00%	+5.43M(+139.70%)Added	SEC filing ↗ Feb 13, 2026	▾
06	ARCH Venture Management, LLC CIK 1274403 · View history	$24.97M 8,055,916 shares	3.83%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
07	Samsara BioCapital, LLC CIK 1744967 · View history	$22.39M 7,222,559 shares	2.31%	+1.09M(+17.80%)Added	SEC filing ↗ Feb 17, 2026	▾
08	Siren, L.L.C. CIK 2005245 · View history	$16.15M 5,208,968 shares	0.48%	0(0.00%)Unchanged	SEC filing ↗ Feb 13, 2026	▾
09	683 Capital Management, LLC CIK 1404574 · View history	$16.09M 5,190,800 shares	1.34%	+131.60K(+2.60%)Added	SEC filing ↗ Feb 17, 2026	▾
10	HHLR ADVISORS, LTD. CIK 1762304 · View history	$15.42M 4,974,041 shares	0.50%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
11	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$15.11M 4,872,714 shares	0.00%	+183.18K(+3.90%)Added	SEC filing ↗ Feb 9, 2026	▾
12	Palo Alto Investors LP CIK 1306923 · View history	$13.86M 4,471,592 shares	1.93%	-992.76K(-18.20%)Reduced	SEC filing ↗ Feb 17, 2026	▾
13	ACADIAN ASSET MANAGEMENT LLC CIK 916542 · View history	$13.69M 4,416,903 shares	0.02%	-596.07K(-11.90%)Reduced	SEC filing ↗ Feb 10, 2026	▾
14	FMR LLC CIK 315066 · View history	$13.14M 4,237,590 shares	0.00%	+152.24K(+3.70%)Added	SEC filing ↗ Feb 17, 2026	▾
15	Corient Private Wealth LLC CIK 1948780 · Amended · View history	$11.92M 3,845,885 shares	0.02%	+3.83M(+19,123.70%)Added	SEC filing ↗ Mar 9, 2026	▾
16	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$11.11M 3,584,288 shares	0.01%	-35.04K(-1.00%)Reduced	SEC filing ↗ Feb 17, 2026	▾
17	TWO SIGMA INVESTMENTS, LP CIK 1179392 · View history	$10.53M 3,397,110 shares	0.02%	+1.11M(+48.50%)Added	SEC filing ↗ Feb 17, 2026	▾
18	Rock Springs Capital Management LP CIK 1595725 · View history	$10.13M 3,266,960 shares	0.52%	0(0.00%)Unchanged	SEC filing ↗ Feb 17, 2026	▾
19	PERCEPTIVE ADVISORS LLC CIK 1224962 · View history	$9.73M 3,139,669 shares	0.18%	-673.13K(-17.70%)Reduced	SEC filing ↗ Feb 17, 2026	▾
20	Opaleye Management Inc. CIK 1595855 · Amended · View history	$8.43M 2,720,000 shares	1.11%	-5.00K(-0.20%)Reduced	SEC filing ↗ Apr 13, 2026	▾

Showing 20 / 195 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

195

Cancelled or null records excluded

Disclosed shares

184,981,714

Not deduplicated across managers

Disclosed value

$573.41M

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. · Q4 2025

Explore all 195 reporting institutions.

This page includes 20 of 195 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

Download CSV
Earlier quarters
Advanced screening & filtering
API & AI access

Already have an account?

＋ New accounts get free API credits to explore data beyond ownership filings.

For AI agents & developers

The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 195 reporting institutions; totals use the complete disclosed data.

Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP / CLI.

MCP  https://api.akkrudata.ai/mcp

akkru_institutional_holdings
{"action":"holders","cusip":"38341P102","quarter":"2025Q4","type":"positions","page_size":100}

Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.

MCP endpoint: https://api.akkrudata.ai/mcp
API / MCP / CLI documentation: /documents
llms.txt: /llms.txt

Sources, coverage & how to read this data

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.