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Gossamer Bio Ownership | Who Owns Gossamer Bio?

OverviewForecastRevenueFinancialsChartTranscripts

Gossamer Bio Ownership Summary

Gossamer Bio is owned by 8.19% institutional investors, 3.92% insiders, and 87.88% 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 Bio8.19%3.92%87.88%
SectorHealthcare Stocks 42.54%10.83%46.63%
IndustryBiotech Stocks 45.22%10.75%44.04%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Nea management company18.09M7.96%$47.58M
Octagon capital advisors lp17.05M7.50%$44.84M
Blackrock funding, inc. /de13.85M6.09%$36.42M
Vanguard group12.01M5.28%$31.59M
Arch venture management8.06M3.54%$21.19M
Samsara biocapital6.13M2.70%$16.12M
Palo alto investors lp5.46M2.40%$14.37M
Siren5.21M2.29%$13.70M
683 capital management5.06M2.23%$13.31M
Acadian asset management5.01M2.21%$13.18M

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Octagon capital advisors lp17.05M6.80%$44.84M
Arch venture management8.06M4.30%$21.19M
Palo alto investors lp5.46M2.66%$14.37M
Nea management company18.09M2.61%$47.58M
Mb generational wealth1.41M2.36%$3.72M
Samsara biocapital6.13M2.10%$16.12M
Silverarc capital management4.78M1.69%$12.57M
Opaleye management2.73M1.01%$7.17M
Exome asset management451.70K0.72%$1.19M
683 capital management5.06M0.70%$13.31M

Top Buyers

HolderShares% AssetsChange
Perceptive advisors3.81M0.29%3.81M
Ubs group2.77M0.00%2.46M
Blackrock funding, inc. /de13.85M0.00%1.70M
Mb generational wealth1.41M2.36%1.41M
State street3.88M0.00%1.40M

Top Sellers

HolderShares% AssetsChange
Ecor1 capital---9.20M
Farallon capital management---6.13M
Madison avenue partners, lp---4.14M
Ci private wealth20.01K0.00%-3.67M
Fmr4.09M0.00%-3.23M

New Positions

HolderShares% AssetsChangeValue
Perceptive advisors3.81M0.29%3.81M$10.03M
Mb generational wealth1.41M2.36%1.41M$3.72M
Tang capital management800.00K0.08%800.00K$2.10M
Adage capital partners gp726.80K0.00%726.80K$1.91M
Russell investments group685.05K0.00%685.05K$1.80M

Sold Out

HolderChange
Zurcher kantonalbank (zurich cantonalbank)-4.00
Pfs partners-50.00
Northwestern mutual wealth management-261.00
Raymond james financial-270.00
Global retirement partners-300.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Sep 30, 202543-65.60%18,623,130-89.32%80.14%28-59.42%11-56.00%
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%

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 8.19%, followed by 3.92% insiders and 87.89% retail investors. The average institutional ownership in Gossamer Bio's industry, Biotech Stocks , is 45.22%, 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%), Octagon capital advisors lp (17.05M shares, 7.50%), and Blackrock funding, inc. /de (13.85M shares, 6.09%). Together, they hold 21.55% 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 6.80% of its assets in 17.05M Gossamer Bio shares, valued at 44.84M$.

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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