BlackRock (ACHC holder) discloses 15% Acadia Healthcare stake in amended 13G

Rhea-AI Filing Summary

BlackRock, Inc. filed an amended Schedule 13G reporting its beneficial ownership of common stock of Acadia Healthcare Company, Inc. BlackRock reported beneficial ownership of 13,831,925 shares, representing 15.0% of Acadia’s outstanding common stock.

BlackRock reported sole voting power over 13,688,826 shares and sole dispositive power over 13,831,925 shares, with no shared voting or dispositive power. The filing notes that one holder, iShares Core S&P Small-Cap ETF, has an interest in more than five percent of Acadia’s total outstanding common stock.

Key Figures

Beneficially owned shares: 13,831,925 shares Percent of class: 15.0% Sole voting power: 13,688,826 shares +3 more

6 metrics

Beneficially owned shares 13,831,925 shares Common stock of Acadia Healthcare Company, Inc. reported by BlackRock, Inc.

Percent of class 15.0% Portion of Acadia Healthcare common stock beneficially owned by BlackRock, Inc.

Sole voting power 13,688,826 shares Shares for which BlackRock has sole power to vote or direct the vote

Shared voting power 0 shares Shares for which BlackRock has shared power to vote or direct the vote

Sole dispositive power 13,831,925 shares Shares for which BlackRock has sole power to dispose or direct disposition

Shared dispositive power 0 shares Shares for which BlackRock has shared power to dispose or direct disposition

Key Terms

Schedule 13G, beneficially owned, Sole Voting Power, Sole Dispositive Power, +1 more

5 terms

Schedule 13G regulatory

"In accordance with SEC Release No. 34-39538 (January 12, 1998), this reflects the securities"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned financial

"this reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"5 | Sole Voting Power 13,688,826.00 6 | Shared Voting Power 0.00"

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 Power financial

"7 | Sole Dispositive Power 13,831,925.00 8 | Shared Dispositive Power 0.00"

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.

percent of class financial

"(b) | Percent of class: 15.0 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What percentage of Acadia Healthcare (ACHC) does BlackRock currently report owning?

BlackRock reports beneficial ownership of 15.0% of Acadia Healthcare’s common stock. This corresponds to 13,831,925 shares reported on a Schedule 13G/A, reflecting holdings by specified BlackRock reporting business units.

How many Acadia Healthcare (ACHC) shares does BlackRock report as beneficially owned?

BlackRock reports beneficial ownership of 13,831,925 shares of Acadia Healthcare common stock. These shares are attributed to certain BlackRock reporting business units as described in the Schedule 13G/A filing.

What voting power does BlackRock report over Acadia Healthcare (ACHC) shares?

BlackRock reports sole voting power over 13,688,826 Acadia Healthcare shares and no shared voting power. It also reports sole, but not shared, dispositive power over its full beneficially owned position.

Which BlackRock-related holder has more than 5% of Acadia Healthcare (ACHC)?

The filing states that iShares Core S&P Small-Cap ETF has an interest in more than five percent of Acadia Healthcare’s total outstanding common stock, within BlackRock’s reported beneficial ownership structure.

What type of SEC filing did BlackRock submit for its Acadia Healthcare (ACHC) stake?

BlackRock submitted an Amendment No. 3 to Schedule 13G. This filing reports its beneficial ownership, voting power, and dispositive power over Acadia Healthcare’s common stock as of the reported date.

Does BlackRock report any shared dispositive power over Acadia Healthcare (ACHC) stock?

No. BlackRock reports sole dispositive power over 13,831,925 shares and zero shared dispositive power. All reported authority over disposition is held on a sole, rather than shared, basis.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 3)

Acadia Healthcare Company, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

00404A109

(CUSIP Number)

06/30/2026

(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

BlackRock, Inc.

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 13,688,826.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 13,831,925.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

13,831,925.00

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)

15.0 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Acadia Healthcare Company, Inc.
(b)	Address of issuer's principal executive offices: 4020 Aspen Grove Drive, Suite 900 FRANKLIN TN 37067
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 00404A109
Item 4.	Ownership
(a)	Amount beneficially owned: 13831925
(b)	Percent of class: 15.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 13688826
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 13831925
	(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 interest of 1 such person, iShares Core S&P Small-Cap ETF, in the common stock of Acadia Healthcare Company, Inc. is more than five percent of the total outstanding common stock.
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. See Exhibit 99
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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	07/27/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7