Exhibit 99.1

Joint Filer Information

Name of Joint Filer:	Berkshire Partners LLC
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Partners LLC
By: BPSP, L.P., its managing member
By: Berkshire Partners Holdings LLC, its general partner
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Berkshire Fund VIII-A, L.P.
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Fund VIII-A, L.P.
By Eighth Berkshire Associates LLC,
its general partner
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Berkshire Fund VIII, L.P.
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Fund VIII, L.P.
By Eighth Berkshire Associates LLC, its general partner
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Berkshire Investors III LLC
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Investors III LLC
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Berkshire Investors IV LLC
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Investors IV LLC
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Eighth Berkshire Associates LLC
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Eighth Berkshire Associates LLC
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	Berkshire Partners Holdings LLC
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
Berkshire Partners Holdings LLC
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date

Joint Filer Information

Name of Joint Filer:	BPSP, L.P.
Address of Joint Filer:	200 Clarendon Street 35th Floor Boston, MA 02116-5021
Issuer Name and Ticker or Trading Symbol:	Portillo’s, Inc. [PTLO]
Date of Earliest Transaction (Month/Day/Year):	3/04/2024
Designated Filer:	Berkshire Partners LLC
Signature:
BPSP, L.P.
By: Berkshire Partners Holdings LLC, its general partner
/s/ Sharlyn C. Heslam
Name: Sharlyn C. Heslam
Title: Managing Director
3/06/2024
Date