X0508 4 2023-12-16 0 0001815849 ATI Physical Therapy, Inc. ATIP 0001953718 Kantz Erik C/O ATI PHYSICAL THERAPY 790 REMINGTON BOULEVARD BOLINGBROOK IL 60440 0 1 0 0 Chief Legal Officer 0 Class A Common Stock 2023-12-16 4 F 0 12 6.79 D 16341 D Shares withheld Shares withheld by the Issuer to satisfy tax withholding obligations upon vesting. The Reporting Person was granted Restricted Stock Units which vest annually and Restricted Stock Awards which vest quarterly. There are 15,185 unvested RSUs and 111 unvested RSAs. Erik Kantz 2023-12-19