X0306 4 2022-06-21 0 0001786205 Arcellx, Inc. ACLX 0001629794 New Enterprise Associates 15, L.P. 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001237289 SANDELL SCOTT D 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001559807 Sonsini Peter W. 2855 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001640031 NEA Partners 15, L.P. 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001640033 NEA 15 GP, LLC 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 0001630226 Makhzoumi Mohamad 2855 SAND HILL ROAD MENLO PARK CA 94025 0 0 1 0 0001559827 Florence Anthony A. Jr. 5425 WISCONSIN AVENUE, SUITE 800 CHEVY CHASE MD 20815 0 0 1 0 0001277631 BASKETT FOREST 1954 GREENSPRING DRIVE SUITE 600 TIMONIUM MD 21093 0 0 1 0 Common Stock 2022-06-21 4 P 0 312500 16.00 A 6745262 D The shares are directly held by New Enterprise Associates 15, L.P. ("NEA 15"), and indirectly held by NEA Partners 15, L.P. ("NEA Partners 15"), the sole general partner of NEA 15, NEA 15 GP, LLC ("NEA 15 GP"), the sole general partner of NEA Partners 15, and the individual managers of NEA 15 GP (NEA Partners 15, NEA 15 GP and the individual managers of NEA 15 GP, together, the "Indirect Reporting Persons"). The individual managers of NEA 15 GP are Forest Baskett, Anthony A. Florence, Jr., Mohamad Makhzoumi, Scott D. Sandell and Peter W. Sonsini. 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 NEA 15 shares in which the Indirect Reporting Persons have no pecuniary interest. Louis Citron, attorney in fact 2022-06-23