Anne Marie Cook - 10 Feb 2026 Form 4 Insider Report for Phathom Pharmaceuticals, Inc. (PHAT)

Role: Chief Legal Off. & Corp. Sec.
Signature: /s/ Anne Marie Cook
Issuer symbol: PHAT
Transactions as of: 10 Feb 2026
Net transactions value: -$19,679
Form type: 4
Filing time: 12 Feb 2026, 16:36:29 UTC
Previous filing: 02 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Cook Anne Marie	Chief Legal Off. & Corp. Sec.	C/O PHATHOM PHARMACEUTICALS, INC., 100 CAMPUS DRIVE, SUITE 102, FLORHAM PARK	/s/ Anne Marie Cook	12 Feb 2026	0001320559

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	PHAT	Common Stock	Award	$0	+3,461	+4%	$0.000000	90,195	10 Feb 2026	Direct	F1, F2
transaction	PHAT	Common Stock	Tax liability	$19,679	-1,535	-1.7%	$12.82	88,660	10 Feb 2026	Direct	F3

* 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 June 23, 2025 based on the achievement of performance criteria determined to be satisfied on February 10, 2026.
F2	Includes 1,722 shares acquired under the Phathom Pharmaceuticals, Inc. employee stock purchase plan in January 2026.
F3	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.