Sec Form 4 Filing - Fortress Acquisition Sponsor II LLC @ ATI Physical Therapy, Inc. - 2021-06-16

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Fortress Acquisition Sponsor II LLC 2. Issuer Name and Ticker or Trading Symbol ATI Physical Therapy, Inc. [ ATI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director X __ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) C/O FORTRESS INVESTMENT GROUP LL, 1345 AVENUE OF THE AMERICAS, 46TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 06/16/2021 (Street) NEW YORK, NY10105 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Class A Common Stock, par value $0.0001 06/16/2021 C( 1 ) 8,525,000 A $ 0 ( 2 ) 8,525,000 D Class A Common Stock, par value $0.0001 06/16/2021 P( 3 ) 7,500,000 A $ 10 ( 3 ) 16,025,000 D

< /tr> Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class F Common Stock, par value $0.0001 per share ( 2 ) 06/16/2021 C( 2 ) 8,525,000 ( 2 ) ( 2 ) Class A Common Stock, par value $0.0001 8,525,000 $ 0 ( 2 ) 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Fortress Acquisition Sponsor II LLC C/O FORTRESS INVESTMENT GROUP LL 1345 AVENUE OF THE AMERICAS, 46TH FLOOR NEW YORK, NY10105 X Signatures /s/ David N. Brooks, Secretary 06/18/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )On June 16, 2021, the Issuer consummated the previously announced business combination pursuant to that certain Agreement and Plan of Merger, dated as of February 21, 2021, (the "Business Combination"). ( 2 )In connection with the closing of the Business Combination (the "Closing"), all shares of the Issuer's Class F common stock were converted into shares of Class A common stock and subject to certain vesting and forfeiture provisions as set forth in the Amended and Restated Letter Agreement, dated as of February 21, 2021. ( 3 )Immediately prior to the Closing, the Reporting Person purchased 7,500,000 shares of Common Stock in a private placement at a price of $10.00 per share pursuant to the Subscription Agreement, dated as of February 21, 2021.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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