X0306 4/A 2018-10-18 2018-10-22 0 0001664106 LogicBio Therapeutics, Inc. LOGC 0001752768 Falb Dean C/O LOGICBIO THERAPEUTICS, INC. 610 MAIN STREET, 3RD FLOOR CAMBRIDGE MA 02139 0 1 0 0 Chief Scientific Officer Employee Stock Option (right to buy) 10.00 2018-10-18 4 A 0 30000 0.00 A 2028-10-17 Common Stock 30000 30000 D The option becomes exercisable in equal one forty-eighth installments from the vesting commencement date, October 18, 2018. The Form 4, as originally filed, incorrectly reported the number of derivative securities acquired, the amount of underlying securities and the number of derivative securities beneficially owned. The Form 4, as amended by this Form 4/A, correctly reports such information. /s/ Matthias Jaffe, as Attorney-in-Fact 2018-10-24