X0306 4 2019-05-08 0 0001339970 aTYR PHARMA INC LIFE 0001238362 MENDLEIN JOHN 3545 JOHN HOPKINS COURT, SUITE 250 SAN DIEGO CA 92121 1 0 0 0 Stock Option (right to buy) 0.5834 2019-05-08 4 A 0 20000 0.00 A 2029-05-08 Common Stock 20000 20000 D The option, granted pursuant to the Issuer's non-employee director compensation policy, vests in full on the earlier of (i) May 8, 2020 or (ii) the Issuer's 2020 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors. Nancy Krueger, as Attorney-in-Fact 2019-05-10