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):

5/19/2025

 

 

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. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Berkshire Fund VIII-A, L.P.

 

 

 

By Eighth Berkshire Associates LLC,

 

its general partner

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Berkshire Fund VIII, L.P.

 

 

 

By Eighth Berkshire Associates LLC,

 

its general partner

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Berkshire Investors III LLC

 

 

 

 

 

 

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Berkshire Investors IV LLC

 

 

 

 

 

 

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Eighth Berkshire Associates LLC

 

 

 

 

 

 

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Berkshire Partners Holdings LLC

 

 

 

 

 

 

 

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

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 Earliest Transaction

 

(Month/Day/Year):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

BPSP, L.P.

 

 

By: Berkshire Partners Holdings LLC, its general partner

 

 

 

 

 

 

 

 

 

/s/ Sharlyn C. Musslewhite

 

Name: Sharlyn C. Musslewhite

 

Title: Managing Director

 

 

 

5/21/2025

 

Date

 

 

 

 

 

 

 

 

 

 

 

 

 

Joint Filer Information

 

 

 

 

Name of Joint Filer:

Joshua Adam Lutzker

 

 

Address of Joint Filer:

C/O Portillo’s Inc.

 

Suite 400

 

2001 Spring Road

 

Oak Brook, IL 60523

 

 

Issuer Name and Ticker or Trading Symbol:

Portillo’s, Inc. [PTLO]

 

 

Date of Event Earliest Transaction

 

(Month/Day/Year):

5/19/2025

 

 

Designated Filer:

Berkshire Partners LLC

 

 

 

 

 

 

 

 

Signature:

 

 

 

Joshua Adam Lutzker

 

 

By: Joshua Adam Lutzker

 

 

 

 

 

 

 

 

 

/s/ Joshua Adam Lutzker

 

Name: Joshua Adam Lutzker

 

 

 

 

 

5/21/2025

 

Date