Steven L. Basta - 28 Nov 2025 Form 4 Insider Report for Phathom Pharmaceuticals, Inc. (PHAT)

Reporting relationship: President and CEO, Director
Issuer ticker: PHAT
Reported as of: 28 Nov 2025
Net transaction value: -$755,618
SEC form: 4
Accepted by SEC: 02 Dec 2025, 18:45:22 UTC
Prior SEC filing: 26 Sep 2025
Next SEC filing: 15 Dec 2025
Source filing: View source filing
Reporting owner signature: /s/ Steven L. Basta

Key filing fact

Steven L. Basta filed Form 4 for Phathom Pharmaceuticals, Inc. (PHAT) on 02 Dec 2025.

Key facts

This page summarizes Steven L. Basta's Form 4 filing for Phathom Pharmaceuticals, Inc. (PHAT).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 02 Dec 2025, 18:45.

Change

Previous filing in this sequence was filed on 26 Sep 2025.
Current net transaction value: -$755,618.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001417397 Primary reporting owner

Basta Steven L

Relationship: President and CEO, Director
Address: C/O PHATHOM PHARMACEUTICALS, INC., 100 CAMPUS DRIVE, SUITE 102, FLORHAM PARK
Signature: /s/ Steven L. Basta
Signature date: 02 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

PHAT transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +90,000
Change %: +216%
Price: $0.000000
Shares after: 131,625
Date: 28 Nov 2025
Ownership: Direct

PHAT transaction

Common Stock

Tax liability

Transaction value: $755,618
Shares: -48,375
Change %: -37%
Price: $15.62
Shares after: 83,250
Date: 28 Nov 2025
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

PHAT transaction Derivative

Performance Shares

Options Exercise

Transaction value: $0
Shares: -90,000
Change %: -33%
Price: $0.000000
Shares after: 180,000
Date: 28 Nov 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 90,000
Exercise price: $0.000000
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote 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.

Footnote F2

Each performance stock unit represents a contingent right to receive one share of common stock of the Issuer.

Footnote 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.