X0306 4 2015-05-12 1 0001339970 aTYR PHARMA INC LIFE 0001399763 Alta Partners VIII, L.P. C/O ALTA PARTNERS ONE EMBARCADERO CENTER, 37TH FLOOR SAN FRANCISCO CA 94111 0 0 1 0 0001399894 Alta Partners Management VIII, LLC C/O ALTA PARTNERS ONE EMBARCADERO CENTER, 37TH FLOOR SAN FRANCISCO CA 94111 0 0 1 0 0001198325 JANNEY DANIEL C/O ALTA PARTNERS ONE EMBARCADERO CENTER, 37TH FLOOR SAN FRANCISCO CA 94111 0 0 1 0 0001198321 CHAMPSI FARAH C/O ALTA PARTNERS ONE EMBARCADERO CENTER, 37TH FLOOR SAN FRANCISCO CA 94111 0 0 1 0 0001198330 NOHRA GUY P C/O ALTA PARTNERS ONE EMBARCADERO CENTER, 37TH FLOOR SAN FRANCISCO CA 94111 0 0 1 0 Common Stock 2015-05-12 4 C 0 1685758 A 1685758 D Common Stock 2015-05-12 4 C 0 92306 A 1778064 D Series B Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 3600000 0.00 D Common Stock 452595 0 D Series B-2 Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 4320173 0.00 D Common Stock 543136 0 D Series C Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 4361703 0.00 D Common Stock 548356 0 D Series D Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 1126866 0.00 D Common Stock 141671 0 D Series E Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 893655 0.00 D Common Stock 92306 0 D The aggregate number of shares of Issuer's Preferred Stock held by the Reporting Person converted into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares converted into Common Stock on a 1-for-7.95413 basis. Reflects a 1-for-7.95413 stock conversion of the Issure's Preferred Stock into Common Stock which became effective immediately prior to the closing of the Issuer's initial public offering. The shares of Preferred Stock are held of record by Alta Partners VIII, L.P. ("APVIII"). Alta Partners Management VIII, LLC ("APMVIII") is the general partner of APVIII. Guy Nohra, Daniel Janney and Farah Champsi are managing directors of APMVIII and exercise shared voting and investment power with respect to the shares owned by APVIII. Each of the Reporting Persons disclaims beneficial ownership of such securities, except to the extent of his, her or its proportionate pecuniary interest therein. The aggregate number of shares of Issuer's Preferred Stock held by the Reporting Person converted into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares converted into Common Stock on a 1-for-9.6814 basis. Reflects a 1-for 9.6814 stock conversion of the Issuer's Preferred Stock into Common Stock which became effective immediately prior to the closing of the Issuer's initial public offering. /s/ Larry Randall 2015-05-14