MKS Instruments (MKSI) SC 13G MKS INSTRUMENTS / 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 August 29, 2022.

The Carlyle Group Inc.
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Chief Financial Officer
Carlyle Holdings II GP L.L.C.
By:	The Carlyle Group Inc., its sole member
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Chief Financial Officer
Carlyle Holdings II L.L.C.
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 Cayman Investment Holdings, L.P.
By:	CG Subsidiary Holdings L.L.C., its general partner
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director

TC Group Cayman Investment Holdings Sub L.P.
By:	TC Group Cayman Investment Holdings, L.P., its general partner
By:	CG Subsidiary Holdings L.L.C., its general partner
By:	/s/ Anne Frederick, attorney-in-fact
Name:	Curtis L. Buser
Title:	Managing Director
TC Group VI Cayman, L.L.C.
By:	/s/ Jeremy W. Anderson
Name:	Jeremy W. Anderson
Title:	Authorized Person
TC Group VI Cayman, L.P.
By:	TC Group VI Cayman, L.L.C., its general partner
By:	/s/ Jeremy W. Anderson
Name:	Jeremy W. Anderson
Title:	Authorized Person
Carlyle Partners VI Cayman Holdings, L.P.
By:	TC Group VI Cayman, L.P., its general partner
By:	TC Group VI Cayman, L.L.C., its general partner
By:	/s/ Jeremy W. Anderson
Name:	Jeremy W. Anderson
Title:	Authorized Person
CEP IV Managing GP Holdings, Ltd.
By:	/s/ Anat Holtzman
Name:	Anat Holtzman
Title:	Manager

CEP IV Managing GP, L.P.
By:	CEP IV Managing GP Holdings, Ltd., its general partner
By:	/s/ Anat Holtzman
Name:	Anat Holtzman
Title:	Manager
Carlyle Europe Partners IV, L.P.
By:	CEP IV Managing GP, L.P., its general partner
By:	CEP IV Managing GP Holdings, Ltd., its general partner
By:	/s/ Anat Holtzman
Name:	Anat Holtzman
CEP IV Participations, S.à r.l. SICAR
Represented by Andrew Howlett-Bolton, and William Cagney, as Managers
By:	/s/ Andrew Howlett-Bolton
Name:	Andrew Howlett-Bolton
By:	/s/ William Cagney
Name:	William Cagney
CAP IV, L.L.C.
By:	/s/ Kevin Gasque
Name:	Kevin Gasque
Title:	Authorized Person
CAP IV General Partner, L.P.
By:	CAP IV, L.L.C., its general partner
By:	/s/ Kevin Gasque
Name:	Kevin Gasque
Title:	Authorized Person

Carlyle Asia Partners IV, L.P.
By:	CAP IV General Partner, L.P., its general partner
By:	CAP IV, L.L.C., its general partner
By:	/s/ Kevin Gasque
Name:	Kevin Gasque
Title:	Authorized Person
Gamma Holding Company Limited
By:	/s/ Kevin Gasque
Name:	Kevin Gasque
Title:	Director