[SCHEDULE 13G/A] Acadia Healthcare Company, Inc. SEC Filing

Rhea-AI Filing Summary

Wellington Management and related entities report beneficial ownership of 9,423,548 shares of Acadia Healthcare Company, Inc. common stock, representing 10.2% of the class as of the event date 09/30/2025. The filing is a Schedule 13G amendment listing four Wellington-related filers organized in Massachusetts and Delaware. The reported holdings show no sole voting or dispositive power and instead reflect shared voting power of 8,982,886 shares and shared dispositive power of 9,423,548 shares, indicating these securities are owned of record by Wellington clients and managed by its investment advisers. The filing names one client exceeding a 5% threshold: the Vanguard Health Care Fund. Signatures are provided by a Wellington regulatory analyst on 10/07/2025.

Positive

• Material passive stake of 9,423,548 shares representing 10.2%
• Position held in ordinary course (Schedule 13G), indicating no stated intent to change control
• Clear disclosure of shared voting and dispositive powers and client ownership structure

Negative

• No sole voting power reported (0 shares), indicating no unilateral control
• Shared voting power concentration may limit ability to influence corporate decisions despite >5% ownership

Insights

Institutional Ownership Analyst

Wellington holds a material passive stake of 10.2% in ACHC through shared authority.

Wellington and affiliated entities collectively report ownership of 9,423,548 shares, equal to 10.2% of the outstanding common stock. The position is reported on Schedule 13G, which signals a passive investor status rather than an active change-of-control intent.

The filing discloses 0 shares of sole voting or dispositive power while listing 8,982,886 shares with shared voting power, showing decision authority rests across advisers and clients. Monitor any future amendments or Schedule 13D filings within a typical 45–90 day window for shifts from passive to active involvement.

Corporate Governance Specialist

The stake is material but structured as client-owned holdings under advisory control, limiting single‑entity control.

The investors named are holding companies and investment adviser entities; ownership is held of record by clients of the Wellington Investment Advisers and one client (Vanguard Health Care Fund) is identified as exceeding 5% where applicable. This structure explains the shared voting and shared dispositive powers rather than sole control.

For governance impact, the current filing implies limited ability to unilaterally influence board composition or corporate actions. Watch for any disclosures of coordinated voting agreements or a switch to a Schedule 13D if involvement changes in the near term.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 13)

Acadia Healthcare Company, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

00404A109

(CUSIP Number)

09/30/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 00404A109

1

Names of Reporting Persons

Wellington Management Group LLP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 8,982,886.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,423,548.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,423,548.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 00404A109

1

Names of Reporting Persons

Wellington Group Holdings LLP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 8,982,886.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,423,548.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,423,548.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 00404A109

1

Names of Reporting Persons

Wellington Investment Advisors Holdings LLP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 8,982,886.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,423,548.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,423,548.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

10.2 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP No. 00404A109

1

Names of Reporting Persons

Wellington Management Company LLP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 8,922,847.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 9,170,783.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

9,423,548.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

9.9 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Acadia Healthcare Company, Inc.
(b)	Address of issuer's principal executive offices: 6100 Tower Circle, Suite 1000, Franklin TN 37067
Item 2.
(a)	Name of person filing: Wellington Management Group LLP Wellington Group Holdings LLP Wellington Investment Advisors Holdings LLP Wellington Management Company LLP
(b)	Address or principal business office or, if none, residence: c/o Wellington Management Company LLP, 280 Congress Street, Boston MA 02210
(c)	Citizenship: Wellington Management Group LLP - Massachusetts Wellington Group Holdings LLP - Delaware Wellington Investment Advisors Holdings LLP - Delaware Wellington Management Company LLP - Delaware
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 00404A109
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: See the responses to Item 9 on the attached cover pages.
(b)	Percent of class: 10.20 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: See the responses to Item 6 on the attached cover pages.
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: See the responses to Item 8 on the attached cover pages.
Item 5.	Ownership of 5 Percent or Less of a Class.
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. The securities as to which this Schedule is filed are owned of record by clients of one or more investment advisers identified in Item 7 directly or indirectly owned by Wellington Management Group LLP. Those clients have the right to receive, or the power to direct the receipt of, dividends from, or the proceeds from the sale of, such securities. No such client is known to have such right or power with respect to more than five percent of this class of securities, except as follows: Vanguard Health Care Fund
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Pursuant to the instructions in Item 7 of Schedule 13G, the following lists the identity and Item 3 classification of each relevant entity that beneficially owns shares of the security class being reported on this Schedule 13G. Wellington Group Holdings LLP - HC Wellington Investment Advisors LLP - HC Wellington Management Global Holdings, Ltd. - HC One or more of the following investment advisers (the "Wellington Investment Advisers"): Wellington Management Company LLP - IA Wellington Management Canada LLC - IA Wellington Management Singapore Pte Ltd - IA Wellington Management Hong Kong Ltd - IA Wellington Management International Ltd - IA Wellington Management Japan Pte Ltd - IA Wellington Management Australia Pty Ltd - IA The securities as to which this Schedule is filed by Wellington Management Group LLP, as parent holding company of certain holding companies and the Wellington Investment Advisers, are owned of record by clients of the Wellington Investment Advisers. Wellington Investment Advisors Holdings LLP controls directly, or indirectly through Wellington Management Global Holdings, Ltd., the Wellington Investment Advisers. Wellington Investment Advisors Holdings LLP is owned by Wellington Group Holdings LLP. Wellington Group Holdings LLP is owned by Wellington Management Group LLP.
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Wellington Management Group LLP

Signature:	Taisia Lowe
Name/Title:	Regulatory Analyst
Date:	10/07/2025

Wellington Group Holdings LLP

Signature:	Taisia Lowe
Name/Title:	Regulatory Analyst
Date:	10/07/2025

Wellington Investment Advisors Holdings LLP

Signature:	Taisia Lowe
Name/Title:	Regulatory Analyst
Date:	10/07/2025

Wellington Management Company LLP

Signature:	Taisia Lowe
Name/Title:	Regulatory Analyst
Date:	10/07/2025

FAQ

What stake does Wellington report in Acadia Healthcare (ACHC)?

Wellington and affiliated entities report beneficial ownership of 9,423,548 shares, equal to 10.2% of Acadia Healthcare common stock as of 09/30/2025.

Does Wellington have voting control over ACHC shares?

No sole voting power is reported (0 shares). The filing shows shared voting power of 8,982,886 shares and shared dispositive power for 9,423,548 shares.

Is this filing a Schedule 13G or 13D and what does that mean for ACHC investors?

This is a Schedule 13G (amendment), which indicates the position is reported as passive and not intended to change or influence control of the issuer.

Are any underlying clients owning more than 5% disclosed?

Yes, the filing identifies the Vanguard Health Care Fund as a client relevant to the >5% disclosure.

When were the signatures dated on the filing?

Signatures by a Wellington regulatory analyst are dated 10/07/2025 on the amended Schedule 13G.