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 Event Requiring this Statement
(Month/Day/Year):                           9/13/2022

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

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                           9/13/2022

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

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

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

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

Designated Filer:                            Berkshire Partners LLC


Signature:

Berkshire Investors III LLC


/s/ Sharlyn C. Heslam
------------------------------
Name:  Sharlyn C. Heslam
Title: Managing Director

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

Designated Filer:                            Berkshire Partners LLC


Signature:

Berkshire Investors IV LLC


/s/ Sharlyn C. Heslam
------------------------------
Name:  Sharlyn C. Heslam
Title: Managing Director

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

Designated Filer:                            Berkshire Partners LLC


Signature:

Eighth Berkshire Associates LLC


/s/ Sharlyn C. Heslam
------------------------------
Name:  Sharlyn C. Heslam
Title: Managing Director

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

Designated Filer:                            Berkshire Partners LLC


Signature:

Berkshire Partners Holdings LLC


/s/ Sharlyn C. Heslam
------------------------------
Name:  Sharlyn C. Heslam
Title: Managing Director

9/15/2022
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 Event Requiring this Statement
(Month/Day/Year):                            9/13/2022

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

9/15/2022
Date