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NASDAQ: GBIO
Generation Bio Co Stock Ownership - Who owns Generation Bio Co?

OverviewForecastEarningsRevenueDividendOwnership

Insider buying vs selling

Have Generation Bio Co insiders been buying or selling?

Buy
Sell
NameRoleDateSharesPriceValue
Geoff McDonoughDirector2025-10-31293$5.51
$1.61kSell
Phillip SamayoaCHIEF SCIENTIFIC OFFICER2025-10-1534$6.71
$228.14Sell
Kevin John ConwayChief Financial Officer2025-10-1518$6.71
$120.78Sell
Yalonda HowzeCHIEF LEGAL OFFICER2025-10-1599$6.71
$664.29Sell
Geoff McDonoughPRESIDENT AND CEO2025-10-15155$6.71
$1.04kSell
Antoinette PaoneCHIEF OPERATING OFFICER2025-10-1547$6.71
$315.37Sell
Phillip SamayoaCHIEF SCIENTIFIC OFFICER2025-07-15337$0.43
$143.56Sell
Yalonda HowzeCHIEF LEGAL OFFICER2025-07-15983$0.43
$418.76Sell
Kevin John ConwayChief Financial Officer2025-07-15173$0.43
$73.70Sell
Geoff McDonoughPRESIDENT AND CEO2025-07-151,548$0.43
$659.45Sell

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Net Insider Buy/Sell (L12M) Ownership

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GBIO Shareholders

What type of owners hold Generation Bio Co stock?

Institutional
Insider
Retail
NameHoldSharesValueType
Atlas Venture Fund X LP122.87%8,278,876$44.13MInsider
William Seybold56.96%3,837,638$20.45MInsider
Zone Healthcare Holdings LLC56.96%3,837,638$20.45MInsider
Invus Public Equities LP41.77%2,814,191$15.00MInsider
Wellington Biomedical Innovation Master Investors Cayman I LP31.35%2,112,546$11.26MInsider
Casdin Capital LLC23.91%1,611,215$8.59MInsider
James E. Flynn17.61%1,186,215$6.32MInsider
Atlas Venture Associates X LP17.32%1,166,937$6.22MInsider
Jason P. Rhodes17.32%1,166,937$6.22MInsider
Atlas Venture Life Science Advisors LLC12.29%827,946$4.41MInstitution

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GBIO vs Biotech Stocks

TickerInst. %Insider %Net Insider (L12M)Net Insider (L3M)
GBIO12.03%87.97%Net BuyingNet Selling
GNTA2.88%0.00%
RNTX18.96%81.04%Net BuyingNet Buying
KLTO2.52%16.11%
MURA29.83%10.21%Net SellingNet Selling
View Top Biotech Stocks

Generation Bio Co Stock Ownership FAQ

Who owns Generation Bio Co?

Generation Bio Co (NASDAQ: GBIO) is owned by 58.91% institutional shareholders, 430.87% Generation Bio Co insiders, and 0.00% retail investors. Atlas Venture Fund X LP is the largest individual Generation Bio Co shareholder, owning 8.28M shares representing 122.87% of the company. Atlas Venture Fund X LP's Generation Bio Co shares are currently valued at $44.13M.

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