Statement of Changes in Beneficial Ownership (4)

FORM 4

[X] 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 OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * George Simeon	2. Issuer Name and Ticker or Trading Symbol Principia Biopharma Inc. [ PRNB ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    _____ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) C/O SR ONE CAPITAL MANAGEMENT, LP, 161 WASHINGTON STREET, SUITE 500	3. Date of Earliest Transaction (MM/DD/YYYY) 9/28/2020
(Street) CONSHOHOCKEN, PA 19428 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. 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	9/28/2020		U(1)		2982855	D	$100.00	0	I	See Footnote (2)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. 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		7. Title and Amount of Securities Underlying Derivative Security (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
Warrant	$8.9931 (3)	9/28/2020		D (3)			28623	(3)	12/29/2022	Common Stock	28623	(3)	0	I	See Footnote (2)
Director Stock Option (right to buy)	$17.00 (4)	9/28/2020		D (4)			20475	(4)	9/12/2028	Common Stock	20475	(4)	0	D
Director Stock Option (right to buy)	$31.77 (4)	9/28/2020		D (4)			10240	(4)	6/10/2029	Common Stock	10240	(4)	0	D
Director Stock Option (right to buy)	$62.66 (4)	9/28/2020		D (4)			10240	(4)	6/3/2030	Common Stock	10240	(4)	0	D

Explanation of Responses:
(1)	Pursuant to the Agreement and Plan of Merger, dated as of August 16, 2020, by and among Principia Biopharma Inc. (the "Issuer"), Sanofi ("Sanofi") and Kortex Acquisition Corp. ("Purchaser") (the "Merger Agreement"), on September 28, 2020, Purchaser merged with and into the Issuer, with the Issuer continuing as the surviving corporation and a wholly owned subsidiary of Sanofi (the "Merger"). At the effective time of the Merger (the "Effective Time"), these shares were canceled in exchange for $100.00 per share (the "Offer Price") in cash, without interest and subject to any applicable withholding taxes.
(2)	S.R. One, Limited, an indirect, wholly-owned subsidiary of GlaxoSmithKline plc, is the record holder of these shares reported herein. Simeon J. George is the CEO & Managing Partner of SR One Capital Management LP and as of September 14, 2020 was Chief Executive Officer, President and a Member of the Board of Trustees at S.R. One, Limited and an employee of GlaxoSmithKline LLC, an indirect, wholly-owned subsidiary of GlaxoSmithKline plc. Dr. George disclaims beneficial ownership of all shares held by S.R. One, Limited and this report shall not be deemed an admission of beneficial ownership of such shares for the purpose of Section 16 or for any other purpose except to the extent of his pecuniary interest therein.
(3)	Pursuant to the Merger Agreement, at the Effective Time, each warrant was converted into the right to receive the Offer Price less the applicable exercise price per share of such warrant.
(4)	Pursuant to the Merger Agreement, at the Effective Time, each of the unvested and outstanding options was accelerated and became fully vested, and each of the outstanding options was canceled and converted into the right to receive a cash amount equal to the product of (i) the number of shares that are subject to such options, multiplied by (ii) the excess (if any) of (x) the Offer Price over (y) the exercise price payable per share under such options.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
George Simeon C/O SR ONE CAPITAL MANAGEMENT, LP 161 WASHINGTON STREET, SUITE 500 CONSHOHOCKEN, PA 19428	X

Signatures
/s/ Christopher Y. Chai, Attorney-in-Fact for Simeon J. George		9/28/2020
**Signature of Reporting Person		Date