UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of report (Date of earliest event reported): February 6, 2015 (February 5, 2015)

Acadia Healthcare Company, Inc.

(Exact Name of Registrant as Specified in Its Charter)

(615) 861-6000

(Registrant’s Telephone Number, including Area Code)

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

Item 1.01. Entry into a Material Definitive Agreement.

On February 5, 2015, Acadia Healthcare Company, Inc., a Delaware corporation (the “Company”) and its subsidiary guarantors named therein (the “Guarantors”) entered into a Purchase Agreement pursuant to which it agreed to sell $375 million in aggregate principal amount of its 5.625% senior notes due 2023 (the “Senior Notes due 2023”) to Merrill Lynch, Pierce, Fenner & Smith Incorporated, Jefferies LLC and the several other initial purchasers named in Schedule 1 to the Purchase Agreement (the “Initial Purchasers”). The offering of the Senior Notes due 2023 is being made through a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Act”) and to certain non-U.S. persons in transactions outside the United States in reliance on Regulation S under the Act.

The Company intends to use the proceeds from the offering to fund a portion of the purchase price for the planned acquisition of CRC Health Group, Inc. and the fees and expenses related to the transaction. Consummation of the offering will occur concurrently with, and is conditioned upon, the closing of the CRC acquisition expected to occur on February 11, 2015.

The description of the Purchase Agreement contained in this Current Report on Form 8-K is qualified in its entirety by reference to the complete text of the Purchase Agreement, a copy of which is filed as Exhibit 10 hereto and incorporated herein by reference.

On February 5, 2015, the Company issued a press release announcing the pricing and an upsizing of its offering of the Senior Notes due 2023. A copy of the press release is attached as Exhibit 99 to this Form 8-K.

Item 9.01. Financial Statements and Exhibits.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

EXHIBIT INDEX