144 0001997973 XXXXXXXX LIVE 0001703647 Korro Bio, Inc. 001-39062 60 FIRST STREET 2ND FLOOR, SUITE 250 CAMBRIDGE MA 02141 617-468-1999 Agarwal Vineet Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

800 56000.00 9298815 11/11/2024 NASDAQ Common 11/11/2024 Option Granted - 05/30/2021 Issuer N 800 11/11/2024 Cash N Vineet Agarwal

One Kendall Square, Building 600-700 Suite 6-401 Cambridge MA 02139

Common 10/17/2024 10216 799526.48 11/12/2024 07/19/2024 /s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Vineet Agarwal