X0206 3 2015-05-06 0 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 CENTE 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 Series B Redeemable Convertible Preferred Stock Common Stock 3600000 D Series B-2 Redeemable Convertible Preferred Stock Common Stock 4320173 D Series C Redeemable Convertible Preferred Stock Common Stock 4361703 D Series D Redeemable Convertible Preferred Stock Common Stock 1126866 D Series E Redeemable Convertible Preferred Stock Common Stock 893655 D The aggregate number of shares of the Issuer's Preferred Stock held by the Reporting Person converts into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares convert into Common Stock on a 1-for-7.95413 basis. The aggregate number of shares of the Issuer's Preferred Stock held by the Reporting Person converts into Common Stock immediately prior to the closing of the Issuer's initial public offering and has no expiration date. These shares convert into Common Stock on a 1-for-9.6814 basis. 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. /s/ Larry Randall 2015-05-06