SCHEDULE: Atlas Venture Files Schedule 13G for Generation Bio

Atlas Venture entities have jointly filed a Schedule 13G, reporting 0% beneficial ownership of Generation Bio Co. common stock as of March 31, 2026.

Summary

• This filing is a Schedule 13G, an amendment to a previous filing, concerning the common stock of Generation Bio Co.
• The filing is made jointly by several Atlas Venture entities, including Atlas Venture Fund X, L.P., Atlas Venture Associates X, L.P., Atlas Venture Associates X, LLC, Atlas Venture Opportunity Fund I, L.P., Atlas Venture Associates Opportunity I, L.P., and Atlas Venture Associates Opportunity I, LLC.
• The reporting date for this filing is March 31, 2026.
• As of the reporting date, the aggregate amount of Generation Bio Co. common stock beneficially owned by these Atlas Venture entities is 0 shares.
• This represents 0.0% of the class of securities.
• The entities have stated they have sole voting power, shared voting power, sole dispositive power, and shared dispositive power of 0 shares.
• A Joint Filing Agreement is included as an exhibit, confirming the agreement among the parties to jointly file the Schedule 13G.

Sentiment

Score: 3

Explanation: StockSavvy.ai views this filing as neutral to slightly negative due to the complete absence of reported beneficial ownership, which could indicate a divestment or a significant change in investment strategy without further context.

Negatives

• The filing indicates that the reporting persons hold 0 shares of Generation Bio Co. common stock, representing 0.0% of the class.

Future Outlook

No forward-looking statements or guidance are provided in this filing.

Industry Context

StockSavvy.ai notes that Schedule 13G filings are typically made by institutional investors who acquire beneficial ownership of more than 5% of a class of a company's registered equity securities. The absence of any beneficial ownership reported by Atlas Venture entities in this filing suggests a significant shift in their investment position or a correction of previous filings.

Stakeholder Impact

• Shareholders: The lack of reported ownership by a significant venture capital firm like Atlas Venture may lead to questions about the company's investor base and future strategic direction.

Key Dates

Keywords

Schedule 13G, Generation Bio Co., Atlas Venture, Beneficial Ownership, SEC Filing, Common Stock, Joint Filing Agreement