X0306 4 2018-11-05 0 0001731831 Eidos Therapeutics, Inc. EIDX 0001743029 Siu Christine C/O EIDOS THERAPEUTICS, INC. 101 MONTGOMERY STREET, SUITE 2550 SAN FRANCISCO CA 94104 0 1 0 0 See Remarks Stock Option (right to buy) 13.20 2018-11-05 4 A 0 55000 0.00 A 2028-11-05 Common Stock 55000 55000 D The Reporting Person is a participant in the Issuer's 2018 Stock Option and Incentive Plan and received 55,000 stock options (the "Grant") on November 5, 2018. The shares subject to the Grant shall vest as follows: one quarter of the shares shall vest on November 5, 2019 and the remaining unvested shares shall vest ratably over the following 36 months, subject to the Reporting Person's continued service to the Issuer through each vesting date. Chief Financial Officer and Secretary /s/Franco Valle, Attorney-in-Fact 2018-11-07