X0609 4 2026-10-13 1 0002139097 TRex Bio, Inc. TRXB 0001722024 Alexandria Venture Investments, LLC false 26 NORTH EUCLID AVENUE PASADENA CA 91101 0 0 1 0 0 Common Stock 2026-10-13 4 C 0 1167930 A 1167930 D Common Stock 2026-10-13 4 P 0 178571 14 A 1346501 D Series A-3 Preferred Stock 2026-10-13 4 C 0 1033541 0 D Common Stock 267418 0 D Series B Preferred Stock 2026-10-13 4 C 0 3480387 0 D Common Stock 900512 0 D Each share of preferred stock automatically converted into the Issuer's common stock at a ratio of 3.8649 shares of preferred stock to 1 share of common stock upon closing of the Issuer's initial public offering on October 13, 2026, for no additional consideration. The shares had no expiration date. By: /s/ Marc E. Binda, Chief Financial Officer and Treasurer By: ALEXANDRIA REAL ESTATE EQUITIES, INC., a Maryland corporation, managing member 2026-10-15