X0407 4/A 2023-03-22 2023-03-24 0001815849 ATI Physical Therapy, Inc. ATIP 0001944782 Tansey Eimile C/O ATI PHYSICAL THERAPY 790 REMINGTON BOULEVARD. BOLINGBROOK IL 60440 true Chief People Officer false Class A Common Stock 2023-03-22 4 A 0 1470588 0 A 1604240 D Award of restricted stock units subject to stockholder approval of an amendment to the ATI Physical Therapy Inc.'s 2021 Equity Incentive Plan, under which the restricted stock units were granted. The stockholder approval vote is expected to occur at the Company's 2023 Annual Meeting. This amendment is being filed to correct a clerical error in Table I item 4. The securities were acquired and not disposed. /s/John Lines as Attorney-in-Fact for Reporting Person 2023-03-27