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Gossamer Bio Ownership | Who Owns Gossamer Bio?

OverviewForecastRevenueFinancialsChartTranscripts

Gossamer Bio Ownership Summary

Gossamer Bio is owned by 77.46% institutional investors, 3.51% insiders, and 19.03% retail investors. Nea management company is the largest institutional shareholder, holding 7.96% 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

TypeName% Inst% Insiders% Retail
StockGossamer Bio77.46%3.51%19.03%
SectorHealthcare Stocks 487.91%11.08%-398.99%
IndustryBiotech Stocks 307.10%11.11%-218.21%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Nea management company18.09M7.96%$22.25M
Blackrock funding, inc. /de12.14M5.34%$14.94M
Vanguard group10.03M4.43%$9.08M
Arch venture management8.06M3.54%$9.91M
Fmr7.93M3.50%$7.18M
Acadian asset management7.15M3.14%$8.79M
683 capital management6.34M2.79%$7.80M
Samsara biocapital6.13M2.70%$7.54M
Palo alto investors lp5.74M2.53%$7.06M
Siren5.21M2.29%$6.41M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Octagon capital advisors lp1.43M3.97%$20.49M
Arch venture management8.06M3.31%$9.91M
Nea management company18.09M1.68%$22.25M
Samsara biocapital6.13M1.54%$7.54M
Palo alto investors lp5.74M1.50%$7.06M
Silverarc capital management5.15M1.17%$6.33M
Exome asset management1.10M1.07%$1.21M
Opaleye management4.29M1.05%$4.72M
Monaco asset management sam3.55M0.77%$4.37M
683 capital management6.34M0.51%$7.80M

Top Buyers

HolderShares% AssetsChange
Blackrock funding, inc. /de12.14M0.00%9.07M
Gsa capital partners llp862.41K0.06%794.87K
Acadian asset management7.15M0.02%787.91K
Colony group1.15M0.00%450.00K
Two sigma advisers, lp1.16M0.00%357.50K

Top Sellers

HolderShares% AssetsChange
Octagon capital advisors lp1.43M3.97%-16.93M
Ecor1 capital---9.20M
Price t rowe associates inc /md/64.78K--6.37M
Farallon capital management---6.13M
Madison avenue partners, lp---4.14M

New Positions

HolderShares% AssetsChangeValue
Merriman wealth management142.27K0.01%142.27K$128.70K
Merit financial group134.69K0.00%134.69K$354.23K
Alps advisors122.64K0.00%122.64K$150.85K
Intech investment management98.30K0.00%98.30K$120.91K
Quadrature capital95.80K0.00%95.80K$116.87K

Sold Out

HolderChange
Zurcher kantonalbank (zurich cantonalbank)-4.00
Pfs partners-50.00
Northwestern mutual wealth management-261.00
Wells fargo & company/mn-264.00
Global retirement partners-300.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Jun 30, 20251324.76%176,036,5053.57%771.38%7112.70%28-6.67%
Mar 31, 202523-79.82%67,155,072-60.80%290.52%7-85.11%6-77.78%
Dec 31, 20241080.93%166,819,185-4.61%731.23%464.55%24-11.11%
Sep 30, 20241077.00%174,874,925-4.36%771.18%447.32%27-10.00%
Jun 30, 2024100-11.50%182,850,856-7.56%811.05%41-21.15%30-3.23%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
Vanguard US Total Market Shares ETF7.84M3.45%-
Vanguard Total Stock Mkt Idx Inv6.80M2.99%33.18K
Fidelity Select Biotechnology5.45M2.40%-2.13M
iShares Russell 2000 ETF4.65M2.04%-
Vanguard Institutional Extnd Mkt Idx Tr2.04M0.90%-932.41K
Fidelity Small Cap Index1.90M0.83%1.90M
iShares Russell 2000 Growth ETF1.69M0.74%-
Fidelity Extended Market Index1.03M0.45%-8.46K
Schwab US Small-Cap ETF™929.69K0.41%2.38K
Vanguard Russell 2000 ETF908.06K0.40%-58.84K

Recent Insider Transactions

DateNameRoleActivityValue
Aug 19, 2025Milligan Sandra-Buy$50.02K
Jun 24, 2024Aranda Richard Chief Medical OfficerSell$1.26K
Jun 21, 2024Hasnain Faheem President & CEOBuy$250.28K
Jun 18, 2024Giraudo Bryan COO/CFOBuy$59.11K
Jun 17, 2024Smith Robert Paul JR Chief Commercial OfficerBuy$15.05K

Insider Transactions Trends

DateBuySell
2025 Q4--
2025 Q31-
2025 Q2--
2025 Q1--
2024 Q231

GOSS Ownership FAQ

Who Owns Gossamer Bio?

Gossamer Bio shareholders are primarily institutional investors at 77.46%, followed by 3.51% insiders and 19.03% retail investors. The average institutional ownership in Gossamer Bio's industry, Biotech Stocks , is 307.10%, which Gossamer Bio falls below.

Who owns the most shares of Gossamer Bio?

Gossamer Bio’s largest shareholders are Nea management company (18.09M shares, 7.96%), Blackrock funding, inc. /de (12.14M shares, 5.34%), and Vanguard group (10.03M shares, 4.43%). Together, they hold 17.74% 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?

Octagon capital advisors lp is Gossamer Bio’s biggest shareholder by percentage of total assets invested, with 3.97% of its assets in 1.42M Gossamer Bio shares, valued at 20.49M$.

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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