X0306 4 2015-05-12 0 0001339970 aTYR PHARMA INC LIFE 0001238362 MENDLEIN JOHN C/O ATYR PHARMA, INC. 3545 JOHN HOPKINS COURT, SUITE 250 SAN DIEGO CA 92121 1 1 0 0 CEO and Executive Chairman Common Stock 2015-05-12 4 C 0 24055 A 245971 D Series C Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 170218 0.00 D Common Stock 21400 0 D Series D Redeemable Convertible Preferred Stock 2015-05-12 4 C 0 21122 0.00 D Common Stock 2655 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 Issuer's Preferred Stock into Common Stock which became effective immediately prior to the closing of the Issuer's initial public offering. /s/ Nancy Krueger, as Attorney-in-Fact 2015-05-14