[SCHEDULE 13G] Acadia Healthcare Company, Inc. Passive Investment Disclosure (>5%)
Acadia Healthcare: Dimensional reports 5% stake
The reported voting and disposition powers differ: Dimensional listed sole voting power over 4,594,468 shares and sole dispositive power over 4,698,457.
Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.
Acadia Healthcare Company, Inc. (ACHC) is the subject of a Schedule 13G in which Dimensional Fund Advisors reported 4,698,457 shares as beneficially owned, equal to 5.0% of the class, as of September 30, 2026. Dimensional reported sole voting power over 4,594,468 shares and sole dispositive power over 4,698,457 shares, with no shared voting or dispositive power. The shares are owned by the Funds described in the filing; Dimensional disclaims beneficial ownership. It states that, to its knowledge, no individual Fund has an interest exceeding 5% of the class.
Key Figures
Beneficially owned shares:4,698,457 sharesPercent of class:5.0%Sole voting power:4,594,468 shares+3 more
6 metrics
Beneficially owned shares4,698,457 sharesReported by Dimensional Fund Advisors as of September 30, 2026
Percent of class5.0%Reported by Dimensional Fund Advisors
Sole voting power4,594,468 sharesReported by Dimensional Fund Advisors
Sole dispositive power4,698,457 sharesReported by Dimensional Fund Advisors
Shared voting power0 sharesReported by Dimensional Fund Advisors
Shared dispositive power0 sharesReported by Dimensional Fund Advisors
Key Terms
beneficial ownership, sole voting power, sole dispositive power
3 terms
beneficial ownershipregulatory
"Amount beneficially owned"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
sole voting powerregulatory
"Sole power to vote or to direct the vote"
Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.
sole dispositive powerregulatory
"Sole power to dispose or to direct the disposition"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many ACHC shares did Dimensional Fund Advisors report?
Dimensional Fund Advisors reported 4,698,457 Acadia Healthcare common shares as beneficially owned, representing 5.0% of the class as of September 30, 2026.
Who receives dividends or sale proceeds from the ACHC shares reported by Dimensional?
The Funds holding the securities have the right to receive or direct dividends and sale proceeds. Dimensional states that, to its knowledge, no individual Fund has an interest exceeding 5% of the class.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Acadia Healthcare Co Inc
(Name of Issuer)
Common Stock
(Title of Class of Securities)
00404A109
(CUSIP Number)
09/30/2026
(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)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
00404A109
1
Names of Reporting Persons
Dimensional Fund Advisors LP
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
4,594,468.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
4,698,457.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,698,457.00
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)
5.0 %
12
Type of Reporting Person (See Instructions)
IA
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Acadia Healthcare Co Inc
(b)
Address of issuer's principal executive offices:
6100 Tower Circle, Suite 1000, Franklin, TN 37067
Item 2.
(a)
Name of person filing:
Dimensional Fund Advisors LP
(b)
Address or principal business office or, if none, residence:
6300 Bee Cave Road, Building One, Austin, TX 78746
(c)
Citizenship:
Delaware Limited Partnership
(d)
Title of class of securities:
Common Stock
(e)
CUSIP Number(s):
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:
4,698,457 ** see Note 1 **
** Note 1 ** Dimensional Fund Advisors LP, an investment adviser registered under Section 203 of the Investment Advisors Act of 1940, furnishes investment advice to four investment companies registered under the Investment Company Act of 1940, and serves as investment manager or sub-adviser to certain other commingled funds, group trusts and separate accounts (such investment companies, trusts and accounts, collectively referred to as the "Funds"). In certain cases, subsidiaries of Dimensional Fund Advisors LP may act as an adviser or sub-adviser to certain Funds. In its role as investment advisor, sub-adviser and/or manager, Dimensional Fund Advisors LP or its subsidiaries (collectively, "Dimensional") may possess voting and/or investment power over the securities of the Issuer that are owned by the Funds, and may be deemed to be the beneficial owner of the shares of the Issuer held by the Funds. However, all securities reported in this schedule are owned by the Funds. Dimensional disclaims beneficial ownership of such securities. In addition, the filing of this Schedule 13G shall not be construed as an admission that the reporting person or any of its affiliates is the beneficial owner of any securities covered by this Schedule 13G for any other purposes than Section 13(d) of the Securities Exchange Act of 1934.
(b)
Percent of class:
5.0 %
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
4,594,468** see Note 1 **
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
4,698,457** see Note 1 **
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
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 Funds described in Note 1 above have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the securities held in their respective accounts. To the knowledge of Dimensional, the interest of any one such Fund does not exceed 5% of the class of securities. Dimensional Fund Advisors LP disclaims beneficial ownership of all such securities.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
Not Applicable
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.
