Steven L. Basta - 17 Dec 2025 Form 4 Insider Report for Phathom Pharmaceuticals, Inc. (PHAT)

Role: President and CEO, Director
Signature: /s/ Steven L. Basta
Issuer symbol: PHAT
Transactions as of: 17 Dec 2025
Net transactions value: -$483,871
Form type: 4
Filing time: 19 Dec 2025, 17:45:41 UTC
Previous filing: 15 Dec 2025
Next filing: 02 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Basta Steven L	President and CEO, Director	C/O PHATHOM PHARMACEUTICALS, INC., 100 CAMPUS DRIVE, SUITE 102, FLORHAM PARK	/s/ Steven L. Basta	19 Dec 2025	0001417397

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PHAT	Common Stock	Award	$0	+62,038	+75%	$0.000000	145,288	17 Dec 2025	Direct	F1
transaction	PHAT	Common Stock	Tax liability	$483,871	-31,502	-22%	$15.36	113,786	17 Dec 2025	Direct	F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares issued upon vesting of performance stock units granted to the reporting person on April 3, 2025 based on the achievement of performance criteria determined to be satisfied on December 17, 2025.
F2	Represents shares underlying the performance stock units that were surrendered by the reporting person to the Issuer in satisfaction of the Issuer's tax withholding obligation.