SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 4)*

ATI Physical Therapy, Inc.

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Title of Class of Securities)

00216W208

(CUSIP Number)

David N. Brooks

Fortress Investment Group LLC

1345 Avenue of the Americas, 46th Floor

New York, NY 10105

(212) 798-6100

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 21, 2024

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box: ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Fortress Acquisition Sponsor II LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Hybrid GP Holdings (Cayman) LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Cayman Islands
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Hybrid GP Holdings LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FIG LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☑
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Fortress Operating Entity I LP
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FIG Blue LLC (f/k/a FIG Corp.)
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Fortress Investment Group LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FINCO I Intermediate Holdco LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FINCO I LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FIG Parent, LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS Foundation Holdco LP
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) PN

CUSIP No.: 00216W208
	1	NAMES OF REPORTING PERSONS FIG Buyer GP, LLC
	2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) ☐ (b) ☐
	3	SEC USE ONLY
	4	SOURCE OF FUNDS AF
	5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) ☐
	6	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
	NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		7	SOLE VOTING POWER 0
			8	SHARED VOTING POWER 229,833
			9	SOLE DISPOSITIVE POWER 0
			10	SHARED DISPOSITIVE POWER 229,833
	11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 229,833
	12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS) ☐
	13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11) 5.1%
	14	TYPE OF REPORTING PERSON (SEE INSTRUCTIONS) OO

EXPLANATORY NOTE

This Schedule 13D constitutes (i) Amendment No. 3 to the Schedule 13D filed on May 21, 2024, as amended by Amendment No. 1 filed on November 8, 2024 and Amendment No. 2 filed on November 18, 2024, on behalf of FINCO I Intermediate Holdco LLC, FINCO I LLC, FIG Parent, LLC, Foundation Holdco LP and FIG Buyer GP, LLC and (ii) Amendment No. 4 to the Schedule 13D originally filed on June 23, 2021, as amended by Amendment No. 1 filed on August 6, 2021, Amendment No. 2 filed on November 8, 2024 and Amendment No. 3 filed on November 18, 2024, on behalf of Fortress Acquisition Sponsor II LLC, Hybrid GP Holdings (Cayman) LLC, Hybrid GP Holdings LLC, FIG LLC, Fortress Operating Entity I LP, FIG Blue LLC (f/k/a/ FIG Corp.) and Fortress Investment Group LLC (the filings referenced in (i) and (ii) collectively, the “Fortress Schedule 13D”). Capitalized terms not otherwise defined in this Schedule 13D shall have the same meanings ascribed thereto in the Fortress Schedule 13D.

Item 5. Interest in Securities of the Issuer.

Item 5 is hereby amended and restated in its entirety with the following:

The information contained in rows 7, 8, 9, 10, 11 and 13 on the cover pages of this Schedule 13D is incorporated by reference in its entirety into this Item 5.

(a) and (b)

(i)	Amount beneficially owned: See Item 11 of each of the cover pages.
(ii)	Percent of class: See Item 13 of each of the cover pages.
(iii)	Number of shares as to which such person has:
	a.	Sole power to vote or direct the vote: See Item 7 of each of the cover pages.
	b.	Shared power to vote or direct the vote: See Item 8 of each of the cover pages.
	c.	Sole power to dispose or direct the disposition: See Item 9 of each of the cover pages.
	d.	Shared power to dispose or direct the disposition: See Item 10 of each of the cover pages.

All percentages of Common Stock outstanding contained herein are based on 4,411,441 shares of Common Stock outstanding as of October 30, 2024, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed on November 4, 2024, as adjusted pursuant to Rule 13d-3(d)(1)(i) under the Exchange Act to include the 59,333 shares of Common Stock issuable upon the exercise of the Warrants held directly by Sponsor.

The beneficial ownership of an aggregate of 229,833 shares of Common Stock reported herein includes (a) 170,500 shares of Common Stock that are unvested and subject to certain vesting and forfeiture provisions set forth in the Sponsor Letter Agreement (as defined in the Fortress Schedule 13D) and (b) 59,333 shares of Common Stock issuable upon the exercise of the Warrants held directly by Sponsor.

(c) Other than as set forth below, the Reporting Persons have not engaged in any transaction since the most recent filing of Schedule 13D involving shares of Common Stock. The below sales of Common Stock occurred in the open market.

Date of Transaction	Quantity of Common Stock Sold	Weighted Average Price per Share of Common Stock⁽¹⁾⁽²⁾
November 19, 2024	14,000	$1.75⁽³⁾
November 20, 2024	9,000	$1.59⁽⁴⁾
November 21, 2024	28,342	$1.49⁽⁵⁾

(1) Excludes commissions and other execution-related costs.

(2) Upon request by the staff of the Securities and Exchange Commission, full information regarding the number of shares sold at each separate price will be provided.

(3) Reflects a weighted average sale price of $1.75 per share, at prices ranging from $1.66 to $1.84 per share, inclusive.

(4) Reflects a weighted average sale price of $1.59 per share, at prices ranging from $1.54 to $1.705 per share, inclusive.

(5) Reflects a weighted average sale price of $1.49 per share, at prices ranging from $1.47 to $1.60 per share, inclusive.

(d) No person other than the Reporting Persons and the investors in the Sponsor and the Funds is known by the Reporting Persons to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock beneficially owned by the Reporting Persons and described in this Item 5.

(e) Not applicable.

SIGNATURES

After reasonable inquiry and to the best of each of the undersigned’s knowledge and belief, each of the undersigned, severally and not jointly, certifies that the information set forth in this statement is true, complete and correct.

Dated: November 25, 2024	FORTRESS ACQUISITION SPONSOR II LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	HYBRID GP HOLDINGS (CAYMAN) LLC
	By:	Hybrid GP Holdings LLC, its managing member

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	HYBRID GP HOLDINGS LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FIG LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FORTRESS OPERATING ENTITY I LP
	By:	FIG Blue LLC, its general partner

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FIG BLUE LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FORTRESS INVESTMENT GROUP LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FINCO I INTERMEDIATE HOLDCO LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FINCO I LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FIG PARENT, LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FOUNDATION HOLDCO LP
	By:	FIG Buyer GP, LLC, its general partner

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

Dated: November 25, 2024	FIG BUYER GP, LLC

	By:	/s/ David N. Brooks
	Name:	David N. Brooks
	Title:	Secretary

ATI Physical Therapy, Inc. SC 13D/A