Sec Form 4 Filing - BridgeBio Pharma, Inc. @ Eidos Therapeutics, Inc. - 2021-01-26

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person BridgeBio Pharma, Inc. 2. Issuer Name and Ticker or Trading Symbol Eidos Therapeutics, Inc. [ EIDX] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 421 KIPLING STREET 3. Date of Earliest Transaction (MM/DD/YY) 01/26/2021 (Street) PALO ALTO, CA94301 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 01/26/2021 P 14,428,836 ( 1 ) ( 2 ) A 1,000 ( 3 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other B ridgeBio Pharma, Inc. 421 KIPLING STREET PALO ALTO, CA94301 X Signatures BridgeBio Pharma, Inc., By: /s/ Neil Kumar, Chief Executive Officer 01/26/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On January 26, 2021, pursuant to the Agreement and Plan of Merger, dated as of October 5, 2020 (the "Merger Agreement"), by and among BridgeBio Pharma, Inc. ("BridgeBio"), Eidos Therapeutics, Inc. ("Eidos"), Globe Merger Sub I, Inc. ("Merger Sub I") and Globe Merger Sub II, Inc. ("Merger Sub II"), Merger Sub I merged with and into Eidos (the "Initial Merger"), with Eidos surviving the Initial Merger, and thereafter Eidos merged with and into Merger Sub II (the "Subsequent Merger" and, together with the Initial Merger, the "Mergers"), with Merger Sub II surviving the Subsequent Merger as an indirect and wholly owned subsidiary of BridgeBio under the name "Eidos Therapeutics, Inc." (the "Surviving Corporation"). ( 2 )(Continued from footnote 1) At the Effective Time, each share of common stock, par value $0.001 per share, of Eidos ("Eidos Common Stock") issued and outstanding immediately prior to the Effective Time (subject to certain exceptions) was converted into the right to receive, at the election of each stockholder of Eidos, (A) 1.85 shares of BridgeBio's common stock ("BridgeBio Common Stock"), par value $0.001 per share (the "Stock Consideration"), or (B) $73.26 in cash (the "Cash Consideration"). As of the Effective Time, all shares of Eidos Common Stock issued and outstanding immediately prior to the Effective Time were cancelled, and all shares of Merger Sub I held by BridgeBio Pharma LLC immediately prior to the consummation of the Initial Merger were converted into shares of the Surviving Corporation in the Mergers. As a result of the Mergers, BridgeBio now owns all of the outstanding shares of common stock of the Surviving Corporation. ( 3 )Calculation of number of shares give effect to the consummation of the Initial Merger described herein, in which shares of Eidos Common Stock issued and outstanding immediately prior to the Effective Time were cancelled and the 1,000 shares of Merger Sub I held by BridgeBio were converted into an aggregate of 1,000 shares of common stock of the Surviving Corporation.

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