X0306 4 2020-05-20 0 0001339970 aTYR PHARMA INC LIFE 0001236447 SCHIMMEL PAUL 3545 JOHN HOPKINS COURT, SUITE #250 SAN DIEGO CA 92121 1 0 0 0 Common Stock 2020-05-20 4 S 0 8447 3.639 D 429143 I See Footnote Common Stock 2890 D Common Stock 63023 I See Footnote The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $3.605 to $3.72, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. There shares are owned directly by Schimmel Revocable Trust U/A Dtd 9/6/2000. The Reporting Person and his spouse are trustees of the Schimmel Revocable Trust U/A Dtd 9/6/2000. These shares are owned directly by Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. The Reporting Person is the sole owner of the Paul Schimmel Prototype PSP, Paul Schimmel Trustee, FBO Paul Schimmel. Nancy Denyes, Attorney-in-Fact 2020-05-22