X0306 4 2022-02-08 0 0001786205 Arcellx, Inc. ACLX 0001475714 Williams Lewis T C/O ARCELLX, INC. 25 WEST WATKINS MILL ROAD, SUITE A GAITHERSBURG MD 20878 1 0 0 0 Common Stock 2022-02-08 4 C 0 2095114 0.00 A 2095114 I See footnote Series B-1 Preferred Stock 2022-02-08 4 C 0 1163886 0.00 D Common Stock 1163886 0 I See footnote Series B-2 Preferred Stock 2022-02-08 4 C 0 931228 0.00 D Common Stock 931228 0 I See footnote All shares of Series B-1 Preferred Stock, par value $0.001 per share, and Series B-2 Preferred Stock, par value $0.001 per share, of the Issuer automatically converted on a one-for-one basis to shares of the Issuer's common stock, par value $0.001 per share ("Common Stock") immediately prior to the closing of the Issuer's initial public offering of its Common Stock. The right to convert the Series B-1 Preferred Stock and Series B-2 Preferred Stock into Common Stock had no expiration date. Shares directly held by Quan Venture Fund II, L.P. The general partner of Quan Capital is Quan Venture Partners II, L.L.C. The Reporting Person, a member of the Issuer's board of directors, is a venture partner at Quan Venture Partners II, L.L.C. and, therefore, may be deemed to have a pecuniary interest over these shares. The Reporting Person disclaims beneficial ownership of the shares held of record by Quan Venture Fund II, L.P. except to the extent of his pecuniary interest therein. /s/ Lance Thibault, as Attorney-in-Fact 2022-02-09