X0306 4 2018-05-15 0 0001339970 aTYR PHARMA INC LIFE 0001236447 SCHIMMEL PAUL 3545 JOHN HOPKINS COURT, SUITE #250 SAN DIEGO CA 92121 1 0 0 0 Stock Option (right to buy) 1.35 2018-05-15 4 A 0 20000 0.00 A 2028-05-15 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 15, 2019 or (ii) the Issuer's 2019 Annual Meeting of Stockholders, subject to the Reporting Person's continued service on the Board of Directors. Nancy Krueger, as Attorney-in-Fact 2018-05-17