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Generation Bio Ownership | Who Owns Generation Bio?

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Generation Bio Ownership Summary

Generation Bio is owned by 11.57% institutional investors, 14.29% insiders, and 74.14% retail investors. Blackrock is the largest institutional shareholder, holding 4.96% of GBIO shares. US Small-Cap Growth II Equity Comp is the top mutual fund, with 7.09% of its assets in Generation Bio shares.

GBIO Ownership Benchmark

TypeName% Inst% Insiders% Retail
StockGeneration Bio11.57%14.29%74.14%
SectorHealthcare Stocks 35.58%11.87%52.55%
IndustryBiotech Stocks 35.75%11.83%52.41%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

HolderShares% HoldingValue
Blackrock3.29M4.96%$9.29M
Bank of america corp /de/2.98M4.49%$8.41M
Artal group2.83M4.26%$7.98M
Vanguard group229.83K3.41%$1.31M
D. e. shaw344.92K0.52%$365.62K
Nuveen asset management169.26K0.25%$179.42K
Advisor group15.46K0.23%$4.95K
Wellington management group llp119.36K0.18%$336.58K
Alliancebernstein72.16K0.11%$76.48K
Abel hall23.57K0.04%$7.54K

Top Institutional Shareholders by % of Total Assets

HolderShares% AssetsValue
Artal group2.83M0.20%$7.98M
Accent capital management38.000.01%$23.37K
Abel hall23.57K0.00%$7.54K
Bank of america corp /de/2.98M0.00%$8.41M
Cubist systematic strategies19.05K0.00%$53.71K
D. e. shaw344.92K0.00%$365.62K
Blackrock3.29M0.00%$9.29M
Wellington management group llp119.36K0.00%$336.58K
Nuveen asset management169.26K0.00%$179.42K
Public employees retirement system of ohio---

Top Buyers

HolderShares% AssetsChange
Blackrock3.29M0.00%245.40K
Wellington management group llp119.36K0.00%119.36K
Abel hall23.57K0.00%23.57K
Susquehanna group, llp22.79K-22.79K
Cubist systematic strategies19.05K0.00%9.07K

Top Sellers

HolderShares% AssetsChange
Bellevue group---3.92M
Ecor1 capital---2.05M
Baker bros. advisors lp---1.94M
Atlas venture life science advisors---827.95K
Pfm health sciences, lp---787.91K

New Positions

HolderShares% AssetsChangeValue
Wellington management group llp119.36K0.00%119.36K$336.58K
Abel hall23.57K0.00%23.57K$7.54K
Susquehanna group, llp22.79K-22.79K$24.16K

Sold Out

HolderChange
Smartleaf asset management-1.00
Optiver b.v.-2.00
Nelson, van denburg & campbell wealth management group-9.00
Eversource wealth advisors-27.00
Srs capital advisors-38.00

Institutional Ownership Trends

DateHoldingsChange %SharesChange %OwnershipChange %Increased PositionChange %Decreased PositionChange %
Dec 31, 202511-71.79%779,217-80.37%110.33%4-50.00%4-86.21%
Sep 30, 20251-98.31%38-100.00%----100.00%--100.00%
Jun 30, 202558-28.40%41,332,3174.83%611.78%23-4.17%25-34.21%
Mar 31, 2025821.23%47,707,211-11.41%711.09%24-38.46%38100.00%
Dec 31, 202420-73.33%12,890,700-76.66%190.28%7-73.08%5-81.48%

Top Mutual Funds Shareholders

HolderShares% HoldingChange
US Small-Cap Growth II Equity Comp4.76M7.09%-509.39K
T. Rowe Price New Horizons475.51K7.06%-1.00
BB Biotech AG Ord3.92M5.87%-
Fidelity Growth Compy Commingled Pl O1.94M2.91%-
Vanguard US Total Market Shares ETF1.56M2.32%-
Vanguard Total Stock Mkt Idx Inv152.41K2.26%-
T. Rowe Price New Horizons Tr-Z1.04M1.56%2.03K
T. Rowe Price Health Sciences102.60K1.52%-8.88K
Fidelity Growth Company Fund972.42K1.45%-380.52K
Fidelity Growth Compy Commingled Pl S873.41K1.30%-461.25K

Recent Insider Transactions

DateNameRoleActivityValue
Jan 10, 2025Quinn Anthony G.-Buy$120.76K
Jan 13, 2025Quinn Anthony G.-Buy$82.45K
Jul 01, 2024Paone Antoinette CHIEF OPERATING OFFICERSell$18.41K
Jan 02, 2024Paone Antoinette CHIEF OPERATING OFFICERSell$3.96K
Jan 02, 2024Samayoa Phillip CHIEF STRATEGY OFFICERSell$3.96K

Insider Transactions Trends

DateBuySell
2026 Q1--
2025 Q4--
2025 Q3--
2025 Q2--
2025 Q12-

GBIO Ownership FAQ

Who Owns Generation Bio?

Generation Bio shareholders are primarily institutional investors at 11.57%, followed by 14.29% insiders and 74.14% retail investors. The average institutional ownership in Generation Bio's industry, Biotech Stocks , is 35.75%, which Generation Bio falls below.

Who owns the most shares of Generation Bio?

Generation Bio’s largest shareholders are Blackrock (3.29M shares, 4.96%), Bank of america corp /de/ (2.98M shares, 4.49%), and Artal group (2.83M shares, 4.26%). Together, they hold 13.71% of Generation Bio’s total shares outstanding.

Does Blackrock own Generation Bio?

Yes, BlackRock owns 4.96% of Generation Bio, totaling 3.29M shares as of Jun 2024. This represents 0.00% of BlackRock's total assets, with a market value of 9.29M$. In the last quarter, BlackRock increased its holdings by 245.4K shares, a 8.05% change.

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

Artal group is Generation Bio’s biggest shareholder by percentage of total assets invested, with 0.20% of its assets in 2.83M Generation Bio shares, valued at 7.98M$.

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

US Small-Cap Growth II Equity Comp is the top mutual fund holder of Generation Bio shares, with 7.09% of its total shares outstanding invested in 4.76M Generation Bio shares.

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