SEC FORM 3

SEC FORM 3 SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

ADVENT INTERNATIONAL CORP/MA

(Last)

(First)

(Middle)

PRUDENTIAL TOWER, 800 BOYLSTON STREET,

SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
06/16/2021

3. Issuer Name and Ticker or Trading Symbol
ATI Physical Therapy, Inc. [ ATIP ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

Director	X	10% Owner
Officer (give title below)		Other (specify below)

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
X	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Class A Common Stock, par value $0.0001 per share	130,300,000⁽¹⁾	I	See Footnotes⁽²⁾⁽⁴⁾

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
Earnout Shares	⁽³⁾	⁽³⁾	Class A Common Stock, par value $0.0001 per share	15,000,000	⁽³⁾	I	See notes⁽²⁾⁽⁴⁾

1. Name and Address of Reporting Person^*

ADVENT INTERNATIONAL CORP/MA

(Last)

(First)

(Middle)

PRUDENTIAL TOWER, 800 BOYLSTON STREET,

SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Advent Partners GPE VII-B Cayman Limited Partnership

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Advent Partners GPE VII Limited Partnership

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Advent Partners GPE VII-A Cayman Limited Partnership

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Advent Partners GPE VII-A Limited Partnership

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

GPE VII ATI Co-Investment Limited Partnership

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Advent International GPE VII, LLC

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Maldonado John L.

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

1. Name and Address of Reporting Person^*

Petrone Carmine

(Last)

(First)

(Middle)

C/O ADVENT INTERNATIONAL CORPORATION

800 BOYLSTON STREET, SUITE 3300

(Street)

BOSTON

02199

(City)

(State)

(Zip)

Explanation of Responses:

1. See Exhibit 99.1 for text of footnote (1)

2. See Exhibit 99.1 for text of footnote (2)

3. See Exhibit 99.1 for text of footnote (3)

4. See Exhibit 99.1 for text of footnote (4)

Remarks:

Exhibit 99.1 (Signatures and Joint Filer Information) and Exhibit 99.2 (Joint Filer Information) are incorporated herein by reference. This Form 3 is the third of three Forms 3 being filed relating to the same event. The Form 3 has been split into three filings because there are more than 10 Reporting Persons in total, and the SEC's EDGAR filing system limits a single Form 3 to a maximum of 10 Reporting Persons. Each Form 3 will be filed by Designated Filer Advent International Corporation. Form 3 of 3

	Advent International Corporation, /s/ James Westra, Name: James Westra, Title: General Counsel and Managing Partner	06/28/2021
	** Signature of Reporting Person	Date
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 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

SEC Form 3: ADVENT INTERNATIONAL CORP/MA claimed ownership of 130,300,000 units of Class A Common Stock