X0306 4 2018-06-22 0 0001731831 Eidos Therapeutics, Inc. EIDX 0001401267 Huh Hoyoung C/O EIDOS THERAPEUTICS, INC. 101 MONTGOMERY STREET, SUITE 2550 SAN FRANCISCO CA 94104 1 0 0 0 Stock Option (right to buy) 17.00 2018-06-22 4 A 0 83720 0.00 A 2028-06-21 Common Stock 83720 83750 D The Reporting Person is a participant in the Issuer's 2018 Stock Option and Incentive Plan and received 83,720 stock options (the "Grant") on June 22, 2018 (the "Grant Date"). The Grant shall vest as follows: one-third of the stock options shall vest annually over a period of three (3) years following the Grant Date subject to the Reporting Person's continued service to the Issuer through each vesting date /s/ Franco Valle, Attorney-in-Fact 2018-06-22