X0206 3 2018-06-19 0 0001731831 Eidos Therapeutics, Inc. EIDX 0001619841 Shah Rajeev M. C/O RA CAPITAL MANAGEMENT LLC 20 PARK PLAZA, SUITE 1200 BOSTON MA 02116 1 0 0 0 Series B Convertible Preferred Stock Common Stock 1103847 I See footnotes The convertible preferred stock automatically converts to common stock immediately prior to the closing of the Issuer's initial public offering on a 1.196-for-one basis, and has no expiration date. Represents 751,282 shares of Series B Convertible Preferred Stock held by RA Capital Healthcare Fund, L.P. (the "Fund") and 171,668 shares of Series B Convertible Preferred Stock held in an account owned by a separately managed account (the "Account"). RA Capital Management, LLC (the "Adviser") is the general partner of the Fund and the investment adviser of the Account. Peter Kolchinsky is the sole manager of the Adviser, and Mr. Shah is a member of the Adviser. Mr. Shah has no pecuniary interest in the reported securities held in the Account and therefore disclaims beneficial ownership of those securities. Mr. Shah disclaims beneficial ownership of the reported securities held by the Fund except to the extent of his pecuniary interest therein. Exhibit 24.1 - Power of Attorney /s/ Franco Valle, Attorney-in-Fact 2018-06-19