Steven L. Basta - 28 Nov 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
28 Nov 2025
Net transactions value
-$755,618
Form type
4
Filing time
02 Dec 2025, 18:45:22 UTC
Previous filing
26 Sep 2025
Next filing
15 Dec 2025
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 02 Dec 2025 0001417397

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction PHAT Common Stock Options Exercise $0 +90,000 +216% $0.000000 131,625 28 Nov 2025 Direct
transaction PHAT Common Stock Tax liability $755,618 -48,375 -37% $15.62 83,250 28 Nov 2025 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction PHAT Performance Shares Options Exercise $0 -90,000 -33% $0.000000 180,000 28 Nov 2025 Common Stock 90,000 $0.000000 Direct F2, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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.
F2 Each performance stock unit represents a contingent right to receive one share of common stock of the Issuer.
F3 On April 3, 2025, the reporting person was granted 360,000 performance stock units, of which 90,000 vested on September 25, 2025 and an additional 90,000 vested on November 28, 2025, in each case due to the achievement of the applicable stock price hurdle. The remaining performance stock units will vest based on the achievement of stock price hurdles over a period of four years following the grant date, subject to the reporting person's continued service through the date each such stock price hurdle is achieved.