X0206 3 2023-11-03 0 0001703647 Korro Bio, Inc. KRRO 0001768564 New Enterprise Associates 17, L.P. 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001796820 NEA Partners 17, L.P. 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001796821 NEA 17 GP, LLC 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 Common Stock 1072936 D The securities are directly held by New Enterprise Associates 17, L.P. ("NEA 17") and are indirectly held by NEA Partners 17, L.P. ("NEA Partners 17"), the sole general partner of NEA 17, NEA 17 GP, LLC ("NEA 17 GP"), the sole general partner of NEA Partners 17, and the individual managers of NEA 17 GP (NEA Partners 17, NEA 17 GP and the individual managers of NEA 17 GP (collectively, the "Managers") together, the "Indirect Reporting Persons"). The Mangers are Forest Baskett, Ali Behbahani, Carmen Chang, Anthony Florence, Jr., Mohamad Makhzoumi, Edward Mathers, Scott Sandell, Paul Walker and Rick Yang. The Indirect Reporting Persons disclaim beneficial ownership within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, or otherwise of such portion of the securities held by NEA 17 in which the Indirect Reporting Persons have no pecuniary interest. /s/ Louis Citron, attorney-in-fact 2023-11-07