Exhibit 99 ACADIA HEALTHCARE REPORTS FIRST QUARTER 2024 RESULTS, AFFIRMS FULL YEAR 2024 GUIDANCE FRANKLIN, Tenn. (May 1, 2024) – Acadia Healthcare Company, Inc. (NASDAQ: ACHC) today announced financial results for the first quarter ended March 31, 2024. First Quarter Highlights ● Revenue totaled $768.1 million, an increase of 9.1% over the first quarter of 2023 ● Same facility revenue increased 9.2% compared with the first quarter of 2023, including an increase in revenue per patient day of 6.9% and an incr ...