X0306 4 2022-07-29 0 0001520697 Acadia Healthcare Company, Inc. ACHC 0001302671 Petrie William M 6100 TOWER CIRCLE, SUITE 1000 FRANKLIN TN 37067 1 0 0 0 Common Stock 2022-07-29 4 S 0 6000 83.42 D 31769 D The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.40 to $83.48, inclusive. The reporting person undertakes to provide to Acadia Healthcare Company, Inc. (Acadia), any security holder of Acadia, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Christopher L. Howard as Attorney in Fact for William M. Petrie 2022-08-02