X0508 4 2026-01-09 0001339970 aTYR PHARMA INC ATYR 0001640869 DENYES NANCY 10240 SORRENTO VALLEY ROAD SUITE 300 SAN DIEGO CA 92121 false true false false General Counsel false Common Stock 31555 D Employee Stock Options (right to buy) 0.7127 2026-01-09 4 A false 412500 0 A 2036-01-09 Common Stock 412500 412500 D Includes 2,500 shares acquired on May 15, 2025 and 2,500 shares acquired on November 14, 2025 under the Company's 2015 Employee Purchase Plan. The shares subject to this option shall vest and become exercisable in 36 equal monthly installments beginning February 9, 2026, such that this option will be fully exercisable on January 9, 2029. This option is subject to accelerated vesting upon termination without cause upon change of control of the issuer. /s/ Nancy E. Denyes 2026-01-09