# EDGAR Filing Document

**Accession Number:** 0001520697
**File Stem:** 0001193125-26-217120
**Filing Date:** 2026-5
**Character Count:** 34750
**Document Hash:** 008f35c23bdd9fd95184d7f11f52c35a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-217120.hdr.sgml**: 20260511

**ACCESSION NUMBER**: 0001193125-26-217120

**CONFORMED SUBMISSION TYPE**: S-8

**PUBLIC DOCUMENT COUNT**: 14

**FILED AS OF DATE**: 20260511

**DATE AS OF CHANGE**: 20260511

**EFFECTIVENESS DATE**: 20260511

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Acadia Healthcare Company, Inc.
- **CENTRAL INDEX KEY:** 0001520697
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-SPECIALTY OUTPATIENT FACILITIES, NEC [8093]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** S-8
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 333-295773
- **FILM NUMBER:** 26964486

**BUSINESS ADDRESS:**
- **STREET 1:** 6100 TOWER CIRCLE
- **STREET 2:** SUITE 1000
- **CITY:** FRANKLIN
- **STATE:** TN
- **ZIP:** 37067
- **BUSINESS PHONE:** 615-861-6000

**MAIL ADDRESS:**
- **STREET 1:** 6100 TOWER CIRCLE
- **STREET 2:** SUITE 1000
- **CITY:** FRANKLIN
- **STATE:** TN
- **ZIP:** 37067

**As filed with the Securities and Exchange Commission on May 11, 2026** 

**Registration No. 333-** 

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

**FORM S-8** 

**REGISTRATION STATEMENT** 

***UNDER***

***THE SECURITIES ACT OF 1933***

## ACADIA HEALTHCARE COMPANY, INC.
**(Exact name of registrant as specified in its charter)** 

---

| | |
|:---|:---|
| **Delaware** | **45-2492228** |
| **(State or other jurisdiction of<br>incorporation or organization)** | **(I.R.S. Employer<br>Identification No.)** |

---

---

| | |
|:---|:---|
| **4020 Aspen Grove Drive, Suite 900<br>Franklin, Tennessee**  | **37067** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

**Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan** 

**(Full title of the plan)** 

**Brian P. Farley** 

**Executive Vice President, Chief Legal and Administrative Officer and Secretary** 

**Acadia Healthcare Company, Inc.** 

**4020 Aspen Grove Drive, Suite 900** 

**Franklin, Tennessee 37067** 

**Telephone: (615) 861-6000** 

**(Name, address and telephone number, including area code, of agent for service)** 

***Copy to:***

**James H. Nixon III** 

**Holland & Knight LLP** 

**511 Union Street, Suite 2700** 

**Nashville, Tennessee 37219** 

**Telephone: (615) 244-6380** 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

---

| | | | |
|:---|:---|:---|:---|
| Large accelerated filer | ☒ | Accelerated filer | ☐ |
| Non-accelerated filer | ☐ | Smaller reporting company | ☐ |
|  |  | Emerging growth company | ☐ |

---

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act. ☐

------

**EXPLANATORY NOTE** 

This registration statement (this "Registration Statement") is being filed pursuant to General Instruction E to Form S-8 and relates to the registration of an additional 3,000,000 shares of common stock of Acadia Healthcare Company, Inc. (the "Registrant") issuable pursuant to the Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan, as amended (the "Incentive Plan"). The contents of the Registrant's registration statements on Form S-8 previously filed with the Securities and Exchange Commission (the "SEC") on November 15, 2011 (Reg. No. 333-177990), July 30, 2013 (Reg. No. 333-190232), May 20, 2016 (Reg. No. 333-211505), August 3, 2021 (Reg. No. 333-258420) and May 30, 2025 (Reg. No. 333-287698), including all exhibits filed therewith or incorporated therein by reference, are incorporated herein by reference and made a part hereof, except as the same may be modified by the information set forth herein.

**PART I** 

**INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS** 

The document(s) containing the information specified in Part I of this Form S-8 will be sent or given to participants as specified by Rule 428(b)(1) of the Securities Act of 1933, as amended (the "Securities Act"). Such documents need not be filed with the SEC either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 of the Securities Act. These documents and the documents incorporated by reference in this Registration Statement pursuant to Item 3 of Part II of Form S-8, taken together, constitute a prospectus that meets the requirements of Section 10(a) of the Securities Act.

**PART II** 

**INFORMATION REQUIRED IN THE REGISTRATION STATEMENT** 

**Item 3. Incorporation of Documents by Reference.** 

The SEC allows us to "incorporate by reference" information into this Registration Statement, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The following documents, which have been filed by the Registrant with the SEC, are incorporated in this Registration Statement by reference:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) The Registrant's Annual Report on [Form 10-K](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526078266/achc-20251231.htm) for the year ended December 31, 2025;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b) The Registrant's Quarterly Report on [Form 10-Q](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526192508/achc-20260331.htm) for the quarter ended March 31, 2026;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(c) The Registrant's Current Reports on Form 8-K filed with the SEC on [January 20, 2026](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000143774926001486/achc20260119_8k.htm), [January 23, 2026](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526020169/d78515d8k.htm), [March 12, 2026](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526104272/d113242d8k.htm), [April 23, 2026](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526173769/d116826d8k.htm) and [May 6, 2026](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000119312526209324/d82444d8k.htm) (other than information furnished pursuant to Item 2.02 or Item 7.01 of the Current Report on Form 8-K, unless expressly stated otherwise therein); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) The description of the Registrant's common stock contained in the Registrant's Registration Statement on [Form 8-A](http://www.sec.gov/Archives/edgar/data/1520697/000119312511288511/d248295d8a12b.htm), filed with the SEC pursuant to Section 12(b) of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), on October 31, 2011 (Reg. No. 001-35331), including any amendments or reports filed for the purpose of updating such descriptions.

All reports and other documents subsequently filed by the Registrant pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act after the date of this Registration Statement, but prior to the filing of a post-effective amendment which indicates that all securities offered hereby have been sold or which deregisters all securities then remaining unsold, shall be deemed to be incorporated by reference herein and to be a part hereof from the date of filing of such documents.

Any statement contained in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein or in any other subsequently filed document which also is or is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.

------

**Item 4. Description of Securities.** 

Not applicable.

**Item 5. Interests of Named Experts and Counsel.** 

Not applicable.

**Item 6. Indemnification of Directors and Officers.** 

The Registrant is incorporated under the laws of the State of Delaware. Section 102(b)(7) of the Delaware General Corporation Law (the "DGCL") allows a corporation to provide in its certificate of incorporation that a director of the corporation will not be personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except where the director breached the duty of loyalty, failed to act in good faith, engaged in intentional misconduct or knowingly violated a law, authorized the payment of a dividend or approved a stock repurchase in violation of Delaware corporate law or obtained an improper personal benefit. The Registrant's amended and restated certificate of incorporation provides for this limitation of liability.

Section 145 of the DGCL ("Section 145") provides that a Delaware corporation may indemnify any person who was, is or is threatened to be made party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person is or was an officer, director, employee or agent of such corporation or is or was serving at the request of such corporation as a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys' fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided such person acted in good faith and in a manner he reasonably believed to be in or not opposed to the corporation's best interests and, with respect to any criminal action or proceeding, had no reasonable cause to believe that his or her conduct was illegal. A Delaware corporation may indemnify any persons who are, were or are threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the corporation by reason of the fact that such person is or was a director, officer, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys' fees) actually and reasonably incurred by such person in connection with the defense or settlement of such action or suit, provided such person acted in good faith and in a manner he reasonably believed to be in or not opposed to the corporation's best interests, provided that no indemnification is permitted without judicial approval if the officer, director, employee or agent is adjudged to be liable to the corporation. Where an officer or director is successful on the merits or otherwise in the defense of any action referred to above, the corporation must indemnify him against the expenses which such officer or director has actually and reasonably incurred.

Section 145 further authorizes a corporation to purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the corporation or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation or enterprise, against any liability asserted against him and incurred by him in any such capacity, or arising out of his or her status as such, whether or not the corporation would otherwise have the power to indemnify him under Section 145.

The Registrant's amended and restated bylaws provide that the Registrant must indemnify its directors and officers to the fullest extent authorized by the DGCL and must also pay expenses incurred in defending any such proceeding in advance of its final disposition; provided, that if and to the extent required by the DGCL, the advancement of expenses shall only be made upon delivery of an undertaking, by or on behalf of an indemnified person, to repay all amounts so advanced if it should be determined ultimately that such person is not entitled to be indemnified.

The Registrant entered into indemnification agreements with each of its directors and executive officers. These agreements require the Registrant to indemnify these individuals to the fullest extent permitted under Delaware law against liabilities that may arise by reason of their service to the Registrant, and to advance expenses incurred as a result of any proceeding against them as to which they could be indemnified.

The indemnification rights set forth above shall not be exclusive of any other right which an indemnified person may have or hereafter acquire under any statute, provision of the Registrant's certificate of incorporation or bylaws, agreement, vote of stockholders or disinterested directors or otherwise.

------

The Registrant maintains standard policies of insurance that provide coverage (1) to its directors and officers against loss arising from claims made by reason of breach of duty or other wrongful act and (2) to the Registrant with respect to indemnification payments that it may make to such directors and officers.

**Item 8.** **Exhibits.** <br>

---

| | |
|:---|:---|
| **Exhibit<br>Number** | **Description** |
| &nbsp;&nbsp;&nbsp;&nbsp;4.1 | [Amended and Restated Certificate of Incorporation of Acadia Healthcare Company, Inc. (the "Company"), as filed on October 28, 2011 with the Secretary of State of the State of Delaware, as amended by the Certificate of Amendments filed on May 25, 2017 and May 23, 2024.](http://www.sec.gov/Archives/edgar/data/1520697/000119312524146576/d833064dex31.htm) (a) |
| &nbsp;&nbsp;&nbsp;&nbsp;4.2 | [Amended and Restated Bylaws of the Company, as amended May 25, 2017.](http://www.sec.gov/Archives/edgar/data/1520697/000119312517183851/d383441dex32.htm) (b) |
| &nbsp;&nbsp;&nbsp;&nbsp;4.3 | [Specimen of the Company's Common Stock Certificate.](http://www.sec.gov/Archives/edgar/data/1520697/000119312511321378/d258032dex41.htm) (c) |
| &nbsp;&nbsp;&nbsp;&nbsp;4.4 | [Amended and Restated Stockholders Agreement, dated as of October 29, 2014, by and among the Company and each of the stockholders named therein.](http://www.sec.gov/Archives/edgar/data/1520697/000119312514389882/d810723dex41.htm) (d) |
| &nbsp;&nbsp;&nbsp;&nbsp;4.5 | [Third Amended and Restated Registration Rights Agreement dated as of December 31, 2015, by and among the Company and each of the parties named therein.](http://www.sec.gov/Archives/edgar/data/1520697/000119312516418747/d113050dex4.htm) (e) |
| &nbsp;&nbsp;&nbsp;&nbsp;4.6 | [Joinder, dated February 16, 2016, to the Third Amended and Restated Registration Rights Agreement dated as of December 31, 2015, by and among the Company and each of the parties named therein.](http://www.sec.gov/Archives/edgar/data/1520697/000119312516418747/d113050dex4.htm) (f) |
| &nbsp;&nbsp;&nbsp;&nbsp;5.1\* | [Opinion of Holland & Knight LLP, with respect to the legality of the shares of common stock being registered hereby.](d128218dex51.htm) |
| 23.1\* | [Consent of Ernst & Young LLP, an independent registered public accounting firm.](d128218dex231.htm) |
| 23.2 | [Consent of Holland & Knight LLP *(included in Exhibit 5.1)*.](d128218dex51.htm) |
| 24 | [Power of Attorney of certain officers and directors of the Company to file future amendments *(set forth on the signature page of this Registration Statement)*.](#tx128218_1) |
| 99.1 | [Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan, effective May 18, 2023](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000114036125013294/ny20042551x1_def14a.htm). (g) |
| 99.2 | [Amendment, effective May 29, 2025, to the Acadia Healthcare Company, Inc. Incentive Compensation Plan](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000114036125013294/ny20042551x1_def14a.htm). (h) |
| 99.3 | [Second Amendment, effective May 6, 2026, to the Acadia Healthcare Company, Inc. Incentive Compensation Plan](http://www.sec.gov/Archives/edgar/data/../../../ix?doc=/Archives/edgar/data/1520697/000114036126011130/ny20062977x1_def14a.htm#APPENDIXA). (i) |
| 107\* | [Filing Fee Table.](d128218dexfilingfees.htm) |

---

\* Filed herewith.

(a) Incorporated by reference to exhibits filed with the Company's Current Report on Form 8-K filed May 24, 2024 (File No. 001-35331).

(b) Incorporated by reference to exhibits filed with the Company's Current Report on Form 8-K filed May 25, 2017 (File No. 001-35331).

(c) Incorporated by reference to exhibits filed with the Company's registration statement on Form S-1, as amended (File No. 333-175523), originally filed with the SEC on November 23, 2011.

(d) Incorporated by reference to exhibits filed with the Company's Current Report on Form 8-K filed October 30, 2014 (File No. 001-35331).

(e) Incorporated by reference to exhibits filed with the Company's Current Report on Form 8-K filed January 4, 2016 (File No. 001-35331).

(f) Incorporated by reference to exhibits filed with the Company's Current Report on Form 8-K filed February 16, 2016 (File No. 001-35331).

------

(g) Incorporated by reference to Appendix B to the Company's Definitive Proxy Statement filed with the SEC on
April 10, 2025 (File No. 001-35331).

(h) Incorporated by reference to Appendix A to the Company's Definitive Proxy Statement filed with the SEC on
April 10, 2025 (File No. 001-35331).

(i) Incorporated by reference to Appendix A to the Company's Definitive Proxy Statement filed with the SEC on
March 25, 2026 (File No. 001-35331).

**Item 9. Undertakings.** 

(a) The undersigned registrant hereby undertakes:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) To include any prospectus required by Section 10(a)(3) of the Securities Act;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price represent no more than 20 percent change in the maximum aggregate offering price set forth in the "Calculation of Filing Fee Tables" or "Calculation of Registration Fee" table, as applicable, in the effective registration statement;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such information in the registration statement;

*provided, however*, that paragraphs (a)(1)(i) and (a)(1)(ii) above do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the SEC by the registrant pursuant to Section 13 or Section 15(d) of the Exchange Act that are incorporated by reference in the registration statement.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2) That, for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial *bona fide* offering thereof.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the registrant's annual report pursuant to Section 13(a) or Section 15(d) of the Exchange Act (and, where applicable, each filing of an employee benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial *bona fide* offering thereof.

(c) Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.

------

**<u>SIGNATURES</u>**

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Franklin of Tennessee, on May 11, 2026.

---

| | |
|:---|:---|
|  ACADIA HEALTHCARE COMPANY, INC. | ACADIA HEALTHCARE COMPANY, INC. |
| By: | /s/ Debra K. Osteen |
|  | Name: Debra K. Osteen |
|  | Title: Chief Executive Officer and Director |

---

**POWER OF ATTORNEY** 

KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below hereby constitutes and appoints Brian P. Farley and David M. Duckworth his or her true and lawful attorney-in-fact and agent, each with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement on Form S-8 and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite and necessary to be done, as fully to all intents and purposes as he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents, or any of them, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by the following persons in the capacities and on the dates indicated.

---

| | | |
|:---|:---|:---|
| Signature | Title | Date |
| /s/ Debra K. Osteen<br> Debra K. Osteen | Chief Executive Officer and Director<br>(Principal Executive Officer) | May 11, 2026 |
| /s/ David M. Duckworth<br> David M. Duckworth | Interim Chief Financial Officer<br>(Principal Financial Officer and Principal Accounting Officer) | May 11, 2026 |
| /s/ Reeve B. Waud<br> Reeve B. Waud | Chairman of the Board | May 11, 2026 |
| /s/ Jason R. Bernhard<br> Jason R. Bernhard | Director | May 11, 2026 |
| /s/ E. Perot Bissell<br> E. Perot Bissell | Director | May 11, 2026 |
| /s/ Daniel J. Cancelmi<br> Daniel J. Cancelmi | Director | May 11, 2026 |
| /s/ Michel J. Fucci<br> Michel J. Fucci | Director | May 11, 2026 |
| /s/ Vicky B. Gregg<br> Vicky B. Gregg | Director | May 11, 2026 |
| /s/ William F. Grieco<br> William F. Grieco | Director | May 11, 2026 |

---

------

---

| | | |
|:---|:---|:---|
| /s/ Patrice A. Harris<br> Patrice A. Harris | Director | May 11, 2026 |
| /s/ R. David Kelly<br> R. David Kelly | Director | May 11, 2026 |

---

## Exhibit 5.1

**Exhibit 5.1**![LOGO](g128218g0511233205605.jpg)

511 Union Street, Suite 2700 \| Nashville, TN 37219

T 615.850.6380 \| F 615.244.6804

Holland & Knight LLP \| www.hklaw.com

May 11, 2026

Acadia Healthcare Company, Inc.

4020 Aspen Grove Drive, Suite 900

Franklin, Tennessee 37067

Re: Registration Statement on Form S-8 for the Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan

Ladies and Gentlemen:

We have acted as counsel to Acadia Healthcare Company, Inc., a Delaware corporation (the "<u>Company</u>"), in connection with the preparation and filing with the Securities and Exchange Commission of a Registration Statement on Form S-8 (the "<u>Registration Statement</u>") pursuant to the Securities Act of 1933, as amended (the "<u>Securities Act</u>"), relating to the registration under the Securities Act by the Company of 3,000,000 additional shares of its common stock, par value $0.01 per share (the "<u>Shares</u>"), issuable under the Company's Amended and Restated Incentive Compensation Plan, as amended (the "<u>Plan</u>"). This opinion is being issued pursuant to the requirements of the Securities Act.

In so acting, we have examined original counterparts or copies of original counterparts of the following documents:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The Registration Statement and all exhibits thereto.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) The Company's Amended and Restated Certificate of Incorporation, as amended to date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) The Company's Amended and Restated Bylaws, as amended to date.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) The Plan.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) Resolutions of the Board of Directors of the Company in connection with the Registration Statement.

We have also examined originals or copies of such records of the Company, certificates and web sites of public officials and of officers or other representatives of the Company and agreements and other documents, and made such other investigations, as we have deemed necessary, subject to the assumptions set forth below, as a basis for the opinions expressed below.

In rendering the opinions set forth herein, we have assumed:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) The genuineness of all signatures (whether manual, electronic or otherwise) and, to the extent that a signature on a document is manifested by electronic or similar means, such signature has been executed or adopted by a signatory with an intent to authenticate and sign the document.

Atlanta \| Austin \| Birmingham \| Boston \| Century City \| Charlotte \| Chattanooga \| Chicago \| Dallas \| Denver \| Fort Lauderdale \| Houston \| Jacksonville \| Los Angeles \| Miami \| Nashville \| New York \| Newport Beach \| Orlando \| Philadelphia \| Portland \| Richmond \| San Francisco \| Seattle \| Stamford \| Tallahassee \| Tampa \| Tysons \| Washington, D.C. \| West Palm Beach

Algiers \| Bogotá \| London \| Mexico City \| Monterrey

------

Acadia Healthcare Company, Inc.

May 11, 2026

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) The authenticity of the originals of the documents submitted to us.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) The conformity to authentic originals of any documents submitted to us as copies.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) As to matters of fact, the truthfulness of the representations made or otherwise incorporated in the Registration Statement and representations and statements made in certificates or web sites of public officials and officers or other representatives of the Company.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) That the offer and sale of Shares under the Plan complies in all respects with the terms, conditions and restrictions set forth in the Registration Statement and the Plan.

We have not independently established the validity of the foregoing assumptions.

Based on the foregoing, and subject to the assumptions, qualifications and limitations stated herein, we are of the opinion that the Shares have been duly authorized by the Company and, when issued and paid for in the manner described in the Plan, the Shares will be validly issued, fully paid and non-assessable.

Our opinion is limited to the General Corporation Law of the State of Delaware, including all reported judicial decisions interpreting such laws, and we do not express any opinion herein concerning any other laws.

This opinion letter has been prepared, and is to be understood, in accordance with customary practice of lawyers who regularly give and lawyers who regularly advise recipients regarding opinions of this kind, is limited to the matters expressly stated herein and is provided solely in connection with the Plan and no opinions may be inferred or implied beyond the matters expressly stated herein. The opinions expressed herein are rendered and speak only as of the date hereof and we specifically disclaim any responsibility to update such opinions subsequent to the date hereof or to advise you of subsequent developments affecting such opinions.

We consent to the reference to this firm in the Registration Statement under the caption "Legal Matters" as the attorneys who will pass upon the legal validity of the Shares and to the filing of this opinion as Exhibit 5.1 to the Registration Statement. Our consent, however, shall not constitute an admission to our being experts as provided for in Sections 7 and 11 of the Securities Act.

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|:---|
|  Respectfully submitted, |
|  /s/ Holland & Knight LLP |
|  HOLLAND & KNIGHT LLP |

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## Exhibit 23.1

**Exhibit 23.1** 

**CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM** 

We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan, as amended, of our reports dated February 26, 2026, with respect to the consolidated financial statements of Acadia Healthcare Company, Inc. and the effectiveness of internal control over financial reporting of Acadia Healthcare Company, Inc., included in its Annual Report (Form 10-K) for the year ended December 31, 2025, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Nashville, Tennessee

May 11, 2026

## Ex-Filing

?xml version='1.0' encoding='ASCII'? EX-FILING FEES

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| |
|:---|
| **Calculation of Filing Fee Tables**  |
| &nbsp;&nbsp;&nbsp;&nbsp;**S-8**  |
| &nbsp;&nbsp;&nbsp;&nbsp;**Acadia Healthcare Company, Inc.**  |

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| | | | | | | | | |
|:---|:---|:---|:---|:---|:---|:---|:---|:---|
| | **Security Type**  | **Security Class Title**  | **Fee Calculation Rule**  | **Amount Registered**  | **Proposed Maximum Offering Price Per Unit**  | **Maximum Aggregate Offering Price**  | **Fee Rate**  | **Amount of Registration Fee**  |
| 1 | Equity | Common Stock, par value $0.01 per share ("Common Stock") | Other | 3000000 | $24.855 | $74565000.00 | 0.0001381 | $10297.43 |
| Total Offering Amounts: | Total Offering Amounts: | Total Offering Amounts: | Total Offering Amounts: | Total Offering Amounts: |  | $74565000.00  |  | $10297.43  |
| Total Fee Offsets:  | Total Fee Offsets:  | Total Fee Offsets:  | Total Fee Offsets:  | Total Fee Offsets:  |  |  |  | $0.00  |
| Net Fee Due:  | Net Fee Due:  | Net Fee Due:  | Net Fee Due:  | Net Fee Due:  |  |  |  | $10297.43  |

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 **Offering Note** <br>

<sup>1</sup> (1) Pursuant to Rule 416 under the Securities Act of 1933, as amended (the "Securities Act"), this Registration Statement shall also cover any additional shares of common stock that become issuable under the Acadia Healthcare Company, Inc. Amended and Restated Incentive Compensation Plan (the "Incentive Plan"), by reason of any stock dividend, stock split, recapitalization, merger, consolidation or reorganization of or by us that results in an increase in the number of shares of our outstanding common stock. (2) Estimated solely for the purpose of determining the registration fee pursuant to Rule 457(c) and Rule 457(h) under the Securities Act, based upon the average of the high and low sale prices per share of Common Stock, as reported on The NASDAQ Global Select Market on May 7, 2026 (which is within five business days prior to the date of filing of this Registration Statement). (3) Calculated at a rate of $138.10 per $1,000,000 of the proposed maximum aggregate offering price.

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| |
|:---|
| |
| **Rule 457(p)** |
| Fee Offset Claims |
| Fee Offset Sources |

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