X0508 4/A 2024-03-22 2024-03-26 0 0001815849 ATI Physical Therapy, Inc. ATIP 0001959039 Cox Christopher L ATI PHYSICAL THERAPY 790 REMINGTON BLVD. BOILINGBROOK IL 60440 0 1 0 0 Chief Operating Officer 0 Class A Common Stock 2024-03-22 4 F 0 5755 6.08 D 53069 D This amendment is being filed to correct a clerical error in the amounts reported. Shares withheld by the Issuer to satisfy tax withholding obligations upon vesting. The Reporting Person was granted Restricted Stock Units (RSUs) which vest annually. There are 39,216 unvested RSUs. /s/Erik Kantz as Attorney-in-Fact for Reporting Person 2024-03-27