SCHEDULE 13D/A

Portillo's Inc

Class A Common Stock, $0.01 par value per share · CUSIP: 73642K106

Event date: 2025-10-20

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Engaged Capital Flagship Master Fund, LPReported CIK 0001580761

  Shares: 100.00 · Class: 0.0001%

• Engaged Capital Co-Invest XVII, LPReported CIK 0002026762

  Shares: 1,534,890.00 · Class: 2.1%

• Engaged Capital LLCReported CIK 0001559771

  Shares: 1,534,990.00 · Class: 2.1%

• Engaged Capital Holdings, LLCReported CIK 0001580769

  Shares: 1,534,990.00 · Class: 2.1%

• Welling Glenn W.Reported CIK 0001580771

  Shares: 1,534,990.00 · Class: 2.1%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.