Company: PHAT
Filing Date: 2025-04-23
Form Type: DEFA14A
Source: 0000950170-25-057335
Chunk: 0

Company: Phathom Pharmaceuticals, Inc.
Filing Date: 2025-04-23
Form: DEFA14A
Chunk 0
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<div align='center'>UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )</div>

Filed by the RegistrantFiled by a Party other than the Registrant

Check the appropriate box:

☐Preliminary Proxy Statement

☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

☐Definitive Proxy Statement

☒Definitive Additional Materials

☐Soliciting Material under §240.14a-12

<div align='center'>Phathom Pharmaceuticals, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)</div>

Payment of Filing Fee (Check the appropriate box):

No fee required

☐Fee paid previously with preliminary materials

☐Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

PHATHOM PHARMACEUTICALS, INC.2025 Annual Meeting Vote by June 2, 202511:59 PM ETPHATHOM PHARMACEUTICALS, INC.100 CAMPUS DRIVE, SUITE 102FLORHAM PARK, NJ 07932V67645-P29094You invested in PHATHOM PHARMACEUTICALS, INC. and it’s time to vote!You have the right to vote on proposals being presented at the Annual Meeting. This is an important notice regarding the availability of proxy materials for the stockholder meeting to be held on June 3, 2025.Get informed before you vote View the Annual Report and Notice and Proxy Statement online OR you can receive a free paper or email copy of the material(s) by requesting prior to May 20, 2025. If you would like to request a copy of the material(s) for this and/or future stockholder meetings, you may (1) visit www.ProxyVote.com, (2) call 1-800-579-1639 or (3) send an email to sendmaterial@proxyvote.com. If sending an email, please include your control number (indicated below) in the subject line. Unless requested, you