Form 4 Tracker
Atlas Venture Fund X, L.P.

10% Owner · 1 filing · Latest: Feb 9, 2026

Generation Bio Co.
TickerOwnerRelationshipDateTransactionCost#SharesValue ($)#Shares TotalSEC Filing
IRON
Atlas Venture Fund X, L.P.Jul 24, 2025
Proposed Sale
$60.9423,245$1.4M
IRON
Atlas Venture Fund X, L.P.Jul 23, 2025
Proposed Sale
$60.7453,215$3.2M
IRON
Atlas Venture Fund X, L.P.Jul 18, 2025
Proposed Sale
$57.791,184$68.4K
IRON
Atlas Venture Fund X, L.P.Feb 5, 2025
Proposed Sale
$54.32112,211$6.1M
IRON
Atlas Venture Fund X, L.P.Feb 4, 2025
Proposed Sale
$54.996,350$349.2K
IRON
Atlas Venture Fund X, L.P.Feb 3, 2025
Proposed Sale
$55.806,439$359.3K

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