Generation Bio Co.

NasdaqGS:GBIO Stock Report

Market Cap: US$38.3m

Generation Bio Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGS:GBIO Recent Insider Transactions by Companies or Individuals
DateValueNameEntityRoleSharesMax Price
13 Jan 25BuyUS$203,209Anthony QuinnIndividual21,079.1US$9.70

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of GBIO?
Owner TypeNumber of SharesOwnership Percentage
Hedge Funds344,2635.11%
Individual Insiders372,4415.53%
Public Companies585,9388.7%
VC/PE Firms1,249,87218.5%
General Public1,387,98820.6%
Institutions2,798,04341.5%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 76.11% of the company
OwnershipNameSharesCurrent ValueChange %Portfolio %
12.3%
Atlas Venture Advisors, Inc.
827,946US$4.7m0%0.54%
8.7%
Moderna, Inc.
585,938US$3.3m0%no data
8.56%
T. Rowe Price Group, Inc.
576,789US$3.3m-31.8%no data
6.26%
Symbiosis Capital Partners, LLC
421,926US$2.4m0%no data
5.11%
Renaissance Technologies LLC
344,263US$2.0m33.4%no data
4.41%
Artal Group S.A.
296,892US$1.7m0%0.03%
3.41%
The Vanguard Group, Inc.
229,833US$1.3m0%no data
3.24%
Marshall Wace LLP
218,461US$1.2m1,780%no data
2.89%
Baker Bros. Advisors LP
194,493US$1.1m0%0.01%
2.78%
Cameron McDonough
187,348US$1.1m0.39%no data
2.44%
Morgan Stanley
164,270US$933.1k80%no data
2.21%
UBS Asset Management AG
148,721US$844.7k68.1%no data
1.89%
Acadian Asset Management LLC
127,506US$724.2k3.37%no data
1.76%
The Goldman Sachs Group, Inc.
118,583US$673.6k13.1%no data
1.57%
Yiheng Capital Management, L.P.
105,524US$599.4k0%0.18%
1.47%
Cantor Fitzgerald Asset Management
99,000US$562.3k0%0.01%
1.44%
Millennium Management LLC
97,354US$553.0k-8.3%no data
1.26%
Bank of America Corporation
84,632US$480.7k-2.73%no data
0.89%
BlackRock, Inc.
60,116US$341.5k-48.3%no data
0.79%
Charles Rowland
53,476US$303.7k0%no data
0.74%
Geode Capital Management, LLC
49,805US$282.9k-0.01%no data
0.7%
Citadel Advisors LLC
47,197US$268.1k146%no data
0.55%
Anthony Quinn
37,212US$211.4k0%no data
0.4%
TD Asset Management, Inc.
26,708US$151.7k-21.6%no data
0.37%
Matthew Stanton
24,978US$141.9k0%no data

Company Analysis and Financial Data Status

DataLast Updated (UTC time)
Company Analysis2026/01/02 14:25
End of Day Share Price 2026/01/02 00:00
Earnings2025/09/30
Annual Earnings2024/12/31

Data Sources

The data used in our company analysis is from S&P Global Market Intelligence LLC. The following data is used in our analysis model to generate this report. Data is normalised which can introduce a delay from the source being available.

PackageDataTimeframeExample US Source *
Company Financials10 years
  • Income statement
  • Cash flow statement
  • Balance sheet
Analyst Consensus Estimates+3 years
  • Forecast financials
  • Analyst price targets
Market Prices30 years
  • Stock prices
  • Dividends, Splits and Actions
Ownership10 years
  • Top shareholders
  • Insider trading
Management10 years
  • Leadership team
  • Board of directors
Key Developments10 years
  • Company announcements

* Example for US securities, for non-US equivalent regulatory forms and sources are used.

Unless specified all financial data is based on a yearly period but updated quarterly. This is known as Trailing Twelve Month (TTM) or Last Twelve Month (LTM) Data. Learn more.

Analysis Model and Snowflake

Details of the analysis model used to generate this report is available on our Github page, we also have guides on how to use our reports and tutorials on Youtube.

Learn about the world class team who designed and built the Simply Wall St analysis model.

Industry and Sector Metrics

Our industry and section metrics are calculated every 6 hours by Simply Wall St, details of our process are available on Github.

Analyst Sources

Generation Bio Co. is covered by 7 analysts. 4 of those analysts submitted the estimates of revenue or earnings used as inputs to our report. Analysts submissions are updated throughout the day.

AnalystInstitution
Whitney IjemCanaccord Genuity
Silvan TuerkcanCitizens JMP Securities, LLC
Eun Kyung YangJefferies LLC