Gossamer Bio Ownership | Who Owns Gossamer Bio?

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Gossamer Bio Ownership Summary

Gossamer Bio is owned by 27.89% institutional investors, 3.53% insiders, and 68.57% retail investors. Blackrock funding, inc. /de is the largest institutional shareholder, holding 7.36% of GOSS shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 3.45% of its assets in Gossamer Bio shares.

GOSS Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Gossamer Bio	27.89%	3.53%	68.57%
Sector	Healthcare Stocks	35.56%	12.08%	52.36%
Industry	Biotech Stocks	35.43%	12.01%	52.56%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Blackrock funding, inc. /de	16.83M	7.36%	$5.53M
Vanguard group	12.87M	5.65%	$39.91M
Aqr capital management	10.13M	4.43%	$3.33M
Arch venture management	8.06M	3.53%	$2.65M
Octagon capital advisors lp	7.75M	3.39%	$2.55M
Samsara biocapital	7.22M	3.16%	$2.37M
Balyasny asset management	5.92M	2.59%	$1.95M
Acadian asset management	5.28M	2.31%	$1.73M
Siren	5.21M	2.28%	$1.71M
683 capital management	5.00M	2.19%	$1.64M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Arch venture management	8.06M	0.39%	$2.65M
Octagon capital advisors lp	7.75M	0.28%	$2.55M
Mb generational wealth	1.53M	0.28%	$503.31K
Samsara biocapital	7.22M	0.23%	$2.37M
Eversept partners, lp	925.23K	0.17%	$2.43M
Hhlr advisors	4.97M	0.10%	$1.63M
683 capital management	5.00M	0.09%	$1.64M
Tang capital management	800.00K	0.08%	$2.10M
Gsa capital partners llp	3.25M	0.07%	$1.07M
Adar1 capital management	212.53K	0.05%	$558.96K

Top Buyers

Holder	Shares	% Assets	Change
Aqr capital management	10.13M	0.00%	9.01M
Balyasny asset management	5.92M	0.00%	4.41M
Qube research	4.92M	0.00%	4.38M
Gsa capital partners llp	3.25M	0.07%	3.20M
Squarepoint ops	3.40M	0.00%	3.18M

Top Sellers

Holder	Shares	% Assets	Change
Nea management company	1.00M	0.02%	-17.09M
Ecor1 capital	-	-	-9.20M
Octagon capital advisors lp	7.75M	0.28%	-6.17M
Farallon capital management	-	-	-6.13M
State street	4.39M	-	-4.92M

New Positions

Holder	Shares	% Assets	Change	Value
Ensign peak advisors	1.70M	0.00%	1.70M	$559.15K
Vanguard fiduciary trust	1.40M	0.00%	1.40M	$462.01K
Tang capital management	800.00K	0.08%	800.00K	$2.10M
Adage capital partners gp	726.80K	0.00%	726.80K	$1.91M
Virtu financial	263.21K	0.00%	263.21K	$86.00K

Sold Out

Holder	Change
Zurcher kantonalbank (zurich cantonalbank)	-4.00
Morton brown family wealth	-25.00
Srs capital advisors	-30.00
Pfs partners	-50.00
Northwestern mutual wealth management	-261.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Mar 31, 2026	124	-42.59%	63,744,203	-65.54%	27	0.42%	77	-36.89%	32	-31.91%
Dec 31, 2025	40	-77.53%	18,408,675	-89.78%	8	0.13%	27	-75.23%	10	-76.19%
Sep 30, 2025	43	-65.60%	18,623,130	-89.32%	8	0.14%	28	-59.42%	11	-56.00%
Jun 30, 2025	132	4.76%	176,036,505	3.57%	77	1.38%	71	12.70%	28	-6.67%
Mar 31, 2025	23	-79.82%	67,155,072	-60.80%	29	0.52%	7	-85.11%	6	-77.78%

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	7.84M	3.45%	-
State Street® SPDR® S&P® Biotech ETF	5.21M	2.23%	28.87K
iShares Russell 2000 ETF	4.70M	2.01%	43.37K
Fidelity Select Biotechnology	4.21M	1.80%	-
Vanguard Total Stock Mkt Idx Inv	6.91M	1.41%	-
iShares Russell 2000 Growth ETF	1.58M	0.68%	-10.28K
Mackenzie Quantitative US Small Cap	1.26M	0.54%	1.19M
State St Russell Sm/Mid Cp® Indx SL Cl I	1.12M	0.48%	-
Xtrackers S&P 500 Swap ETF 1C	1.10M	0.47%	-8.10K
Vanguard Institutional Extnd Mkt Idx Tr	2.24M	0.46%	-

Recent Insider Transactions

Date	Name	Role	Activity	Value
Aug 19, 2025	Milligan Sandra	-	Buy	$50.02K
Jun 24, 2024	Aranda Richard	Chief Medical Officer	Sell	$1.26K
Jun 21, 2024	Hasnain Faheem	President & CEO	Buy	$250.28K
Jun 18, 2024	Giraudo Bryan	COO/CFO	Buy	$59.11K
Jun 17, 2024	Smith Robert Paul JR	Chief Commercial Officer	Buy	$15.05K

Insider Transactions Trends

Date	Buy	Sell
2026 Q2	-	-
2026 Q1	-	-
2025 Q4	-	-
2025 Q3	1	-
2025 Q2	-	-

GOSS Ownership FAQ

Who Owns Gossamer Bio?

Gossamer Bio shareholders are primarily institutional investors at 27.89%, followed by 3.53% insiders and 68.58% retail investors. The average institutional ownership in Gossamer Bio's industry, Biotech Stocks , is 35.43%, which Gossamer Bio falls below.

Who owns the most shares of Gossamer Bio?

Gossamer Bio’s largest shareholders are Blackrock funding, inc. /de (16.83M shares, 7.36%), Vanguard group (12.87M shares, 5.65%), and Aqr capital management (10.13M shares, 4.43%). Together, they hold 17.44% of Gossamer Bio’s total shares outstanding.

Does Blackrock own Gossamer Bio?

BlackRock is not among the top 10 institutional shareholders of Gossamer Bio.

Who is Gossamer Bio’s biggest shareholder by percentage of total assets invested?

Arch venture management is Gossamer Bio’s biggest shareholder by percentage of total assets invested, with 0.39% of its assets in 8.06M Gossamer Bio shares, valued at 2.65M$.

Who is the top mutual fund holder of Gossamer Bio shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Gossamer Bio shares, with 3.45% of its total shares outstanding invested in 7.84M Gossamer Bio shares.

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