X0306 4 2018-12-20 0 0001339970 aTYR PHARMA INC LIFE 0001238362 MENDLEIN JOHN 3545 JOHN HOPKINS COURT, SUITE 250 SAN DIEGO CA 92121 1 0 0 0 Common Stock 2018-12-20 4 P 0 50000 0.4129 A 420382 D Common Stock 2018-12-21 4 P 0 195000 0.4236 A 615382 D Represents weighted average price for the shares. The shares were purchased at price ranging from $0.4013 to $0.4100 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price. Represents weighted average price for the shares. The shares were purchased at price ranging from $0.4048 to $0.4300 per share. The reporting person will provide to the Securities and Exchange Commission staff, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares purchased at each separate price. Nancy Krueger, as Attorney-in-Fact 2018-12-26