Exhibit 99
Joint Filer Information
Each of the following joint filers has designated Knighthead Capital Management, LLC as the “Designated Filer” for purposes of the attached Form 4:
| 1. | KNIGHTHEAD MASTER FUND, L.P. 280 Park Avenue, 22nd floor New York, NY 10017 |
| 2. | KNIGHTHEAD (NY) FUND, L.P. 280 Park Avenue, 22nd floor New York, NY 10017 |
| 3. | KNIGHTHEAD ANNUITY & LIFE ASSURANCE COMPANY 280 Park Avenue, 22nd floor New York, NY 10017 |
| 4. | KNIGHTHEAD DISTRESSED OPPORTUNITIES FUND, L.P. 280 Park Avenue, 22nd floor New York, NY 10017 |
| 5. | KHSU SPV LP LLC 280 Park Avenue, 22nd floor New York, NY 10017 |
| 6. | KH ANKLE LLC 280 Park Avenue, 22nd floor New York, NY 10017 |
Date of Event Requiring Statement: January 30, 2024
Issuer Name and Ticker or Trading Symbol: ATI PHYSICAL THERAPY, INC. [ ATIP ]
| Knighthead Capital Management, LLC, by: /s/ Laura L. Torrado, General Counsel |
| Knighthead Master Fund, L.P., by: /s/ Knighthead Capital Management, LLC as investment manager, by: /s/ Laura L. Torrado, General Counsel |
| Knighthead (NY) Fund, L.P., by: /s/ Knighthead Capital Management, LLC as investment advisor, by: /s/ Laura L. Torrado, General Counsel |
| Knighthead Annuity & Life Assurance Company by: /s/ Knighthead Capital Management as LLC as investment advisor, by: /s/ Laura L. Torrado, General Counsel |
| Knighthead Distressed Opportunities Fund, L.P., by: /s/ Knighthead Capital Management as LLC, investment manager, by: /s/ Laura L. Torrado, General Counsel |
KHSU SPV LP LLC, by: /s/ Laura L. Torrado, Authorized Signatory |
| KH Ankle LLC, by: /s/ Laura L. Torrado, Authorized Signatory |
Date: February 8, 2024
