X0202
SCHEDULE 13G/A
0001104659-24-012925
0001628098
XXXXXXXX
LIVE
3
COMMON STOCK, $0.0001 PAR VALUE
03/31/2026
0001733294 GENERATION BIO CO.
37148K100
301 BINNEY STREET
CAMBRIDGE
MA
02142
Rule 13d-1(d)
Atlas Venture Fund X, L.P.
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
PN
ATLAS VENTURE ASSOCIATES X, L.P.
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
PN
Atlas Venture Associates X, LLC
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
OO
Atlas Venture Opportunity Fund I, L.P.
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
PN
Atlas Venture Associates Opportunity I, L.P.
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
PN
Atlas Venture Associates Opportunity I, LLC
b
DE
0.00
0.00
0.00
0.00
0.00
0.0
OO
GENERATION BIO CO.
301 BINNEY STREET, CAMBRIDGE, MA, 02142.
This Schedule 13G is filed by (i) Atlas Venture Fund X, L.P., a Delaware limited partnership ("Atlas X"), (ii) Atlas Venture Associates X, L.P., a Delaware limited partnership ("AVA X LP"), (iii) Atlas Venture Associates X, LLC, a Delaware limited liability company ("AVA X LLC" and together with Atlas X and AVA X LP, the "Fund X Reporting Persons"), (iv) Atlas Venture Opportunity Fund I, L.P., a Delaware limited partnership ("AVO I"), (v) Atlas Venture Associates Opportunity I, L.P., a Delaware limited partnership ("AVAO LP") and (vi) Atlas Venture Associates Opportunity I, LLC, a Delaware limited liability company ("AVAO LLC" and together with AVO I and AVAO LP, the "Opportunity Fund Reporting Persons" and together with the Fund X Reporting Persons, the "Reporting Persons"). 300 Technology Square, 8th Floor
Cambridge, Massachusetts 02139 Each of Atlas X, AVA X LP, AVO I and AVAO LP is a Delaware limited partnership. Each of AVA X LLC and AVAO LLC is a Delaware limited liability company.
Y
0 0
0
0
0
0
N
Y
Y
Y
Y
Y
Y
JOINT FILING AGREEMENT
Atlas Venture Fund X, L.P.
/s/ Ommer Chohan
By: Atlas Venture Associates X, L.P., its GP, By: Atlas Venture Associates X, LLC, its GP, By: Ommer Chohan, CFO
05/14/2026
ATLAS VENTURE ASSOCIATES X, L.P.
/s/ Ommer Chohan
By: Atlas Venture Associates X, LLC, its GP, By: Ommer Chohan, CFO
05/14/2026
Atlas Venture Associates X, LLC
/s/ Ommer Chohan
Ommer Chohan, CFO
05/14/2026
Atlas Venture Opportunity Fund I, L.P.
/s/ Ommer Chohan
By: Atlas Venture Associates Opportunity I, L.P., its GP, By: Atlas Venture Associates Opportunity I, LLC, its GP, By: Ommer Chohan, CFO
05/14/2026
Atlas Venture Associates Opportunity I, L.P.
/s/ Ommer Chohan
By: Atlas Venture Associates Opportunity I, LLC, its GP, By: Ommer Chohan, CFO
05/14/2026
Atlas Venture Associates Opportunity I, LLC
/s/ Ommer Chohan
Ommer Chohan, CFO
05/14/2026