X0508 4 2023-09-01 0001815849 ATI Physical Therapy, Inc. ATIP 0001944782 Tansey Eimile C/O ATI PHYSICAL THERAPY, INC. 790 REMINGTON BLVD. BOLINGBROOK IL 60440 true Chief People Officer false Class A Common Stock 2023-09-01 4 F 0 174 9.17 D 31911 D As previously reported on September 2, 2022 the reporting person was granted 1,773 Shares of Restricted Stock (post-reverse stock split) vesting in three equal annual installments beginning on the first anniversary of the grant date. Shares withheld by the Issuer to satisfy tax withholding obligations upon vesting. /s/John Lines as Attorney-in-Fact for Reporting Person 2023-09-06