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): 8/16/2022 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 8/18/2022 --------- 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): 8/16/2022 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 8/18/2022 --------- 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): 8/16/2022 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 8/18/2022 --------- 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): 8/16/2022 Designated Filer: Berkshire Partners LLC Signature: Berkshire Investors III LLC /s/ Sharlyn C. Heslam ---------------------------- Name: Sharlyn C. Heslam Title: Managing Director 8/18/2022 --------- 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): 8/16/2022 Designated Filer: Berkshire Partners LLC Signature: Berkshire Investors IV LLC /s/ Sharlyn C. Heslam --------------------------- Name: Sharlyn C. Heslam Title: Managing Director 8/18/2022 --------- 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): 8/16/2022 Designated Filer: Berkshire Partners LLC Signature: Eighth Berkshire Associates LLC /s/ Sharlyn C. Heslam --------------------------- Name: Sharlyn C. Heslam Title: Managing Director 8/18/2022 --------- 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): 8/16/2022 Designated Filer: Berkshire Partners LLC Signature: Berkshire Partners Holdings LLC /s/ Sharlyn C. Heslam ---------------------------- Name: Sharlyn C. Heslam Title: Managing Director 8/18/2022 --------- 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): 8/16/2022 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 8/18/2022 --------- Date
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4 Filing
Berkshire Investors III Form 4Change in insider ownership
Filed: 18 Aug 22, 5:29pm