Generation Bio Co. (GBIO) Insider Trading -- Recent Executive & Director Transactions

19 insiders reported 79 Form 4 transactions for Generation Bio Co. (GBIO) over the past 18 months (most recent 2026-02-09). Recent activity: Cooper Ronald Harold Wilfred (Director) Sell 950 shares, ATLAS VENTURE ASSOCIATES X, L.P. (Insider) Sell 60 shares, Stehman-Breen Catherine (Director) Sell 4,752 shares, Atlas Venture Associates Opportunity I, LLC (Insider) Sell 711,193 shares, Atlas Venture Associates Opportunity I, L.P. (Insider) Sell 711,193 shares. Source: SEC Form 4.

Date	Insider	Title	Type	Shares	Value
2026-02-09	Cooper Ronald Harold Wilfred	Director	Sell	950	$0
2026-02-09	ATLAS VENTURE ASSOCIATES X, L.P.	Insider	Sell	60	$0
2026-02-09	Stehman-Breen Catherine	Director	Sell	4,752	$0
2026-02-09	Atlas Venture Associates Opportunity I, LLC	Insider	Sell	711,193	$0
2026-02-09	Atlas Venture Associates Opportunity I, L.P.	Insider	Sell	711,193	$0
2026-02-09	Atlas Venture Opportunity Fund I, L.P.	Insider	Sell	711,193	$0
2026-02-09	ATLAS VENTURE ASSOCIATES X, L.P.	Insider	Sell	711,193	$0
2026-02-09	MCDONOUGH GEOFF	Director	Sell	138,492	$0
2026-02-09	Atlas Venture Fund X, L.P.	Insider	Sell	711,193	$0
2026-02-09	Atlas Venture Opportunity Fund I, L.P.	Insider	Sell	116,693	$0
2026-02-09	Atlas Venture Associates X, LLC	Insider	Sell	116,693	$0
2026-02-09	Atlas Venture Associates Opportunity I, LLC	Insider	Sell	116,693	$0
2026-02-09	Atlas Venture Fund X, L.P.	Insider	Sell	116,693	$0
2026-02-09	Atlas Venture Associates Opportunity I, L.P.	Insider	Sell	116,693	$0
2026-02-09	ATLAS VENTURE ASSOCIATES X, L.P.	Insider	Sell	116,693	$0
2026-02-09	Atlas Venture Associates Opportunity I, L.P.	Insider	Sell	60	$0
2026-02-09	Atlas Venture Associates Opportunity I, LLC	Insider	Sell	60	$0
2026-02-09	Atlas Venture Fund X, L.P.	Insider	Sell	60	$0
2026-02-09	Atlas Venture Opportunity Fund I, L.P.	Insider	Sell	60	$0
2026-02-09	Conway Kevin John	CHIEF FINANCIAL OFFICER	Sell	2,072	$0
2026-02-09	Atlas Venture Associates X, LLC	Insider	Sell	60	$0
2026-02-09	Rhodes Jason P	Director	Sell	711,193	$0
2026-02-09	Rhodes Jason P	Director	Sell	116,693	$0
2026-02-09	Rhodes Jason P	Director	Sell	60	$0
2026-02-09	Atlas Venture Associates X, LLC	Insider	Sell	711,193	$0

Source: SEC Form 4 filings · as of 2026-02-09