Phathom Pharmaceuticals (PHAT) SC 13G Phathom Pharmaceuticals / Carlyle ownership change

Exhibit 99

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G. Each of them is responsible for the timely filing of such statement and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 9th day of March, 2023.

The Carlyle Group Inc.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Chief Financial Officer
Carlyle Holdings I GP Inc.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director and Chief Financial Officer
Carlyle Holdings I GP Sub L.L.C.
By: Carlyle Holdings I GP Inc., its sole member
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director and Chief Financial Officer
Carlyle Holdings I L.P.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director

CG Subsidiary Holdings L.L.C.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director
TC Group, L.L.C.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director
Carlyle Investment Management L.L.C.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Chief Financial Officer
Carlyle Genesis UK LLC
By: Carlyle Investment Management L.L.C., its sole member
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Chief Financial Officer
Abingworth LLP
By:	/s/ John Heard
Name:	John Heard
Title:	Authorized Signatory
Abingworth Bioventures 8 LP
By:	/s/ John Heard
Name:	John Heard
Title:	Authorized Signatory
Abingworth Bioventures VII LP
By:	/s/ John Heard
Name:	John Heard
Title:	Authorized Signatory