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 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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(Print or Type Responses)
1. Name and Address of Reporting Person *
Altimar Sponsor II, LLC
  2. Issuer Name and Ticker or Trading Symbol
Fathom Digital Manufacturing [ATMR]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See Remarks
(Last)
(First)
(Middle)
C/O ALTIMAR ACQUISITION CORP. II, 40 WEST 57TH STREET, 33RD FLOOR
3. Date of Earliest Transaction (Month/Day/Year)
12/23/2021
(Street)

NEW YORK, NY 10019
4. If Amendment, Date Original Filed(Month/Day/Year)
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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 12/23/2021   M(2)   8,450,000 A (1) (2) 5,915,000 (5) D (4)  

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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 (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 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
(Month/Day/Year)
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 B Ordinary Shares, par value $0.0001 (1) (2) 12/23/2021   M(2)     8,450,000 (1)   (1)   (1) Class A Common Stock (1) (2) (1) (2) 0 D (4)  
Private Placement Warrants $ 11.5 12/23/2021   A(3)     9,900,000   (3)   (3) Class A Common Stock 9,900,000 $ 1 9,900,000 D (4)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
Altimar Sponsor II, LLC
C/O ALTIMAR ACQUISITION CORP. II
40 WEST 57TH STREET, 33RD FLOOR
NEW YORK, NY 10019
      See Remarks

Signatures

 /s/ Faith Rosenfeld, as Chief Administrative Officer   12/28/2021
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(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).
(1) As described in the registration statement on Form S-4 (File No. 333-259639) of Altimar Acquisition Corp. II (the "Issuer"), the shares of Class B ordinary shares of the Issuer (the "Class B Ordinary Shares") held by the reporting person will automatically convert into shares of Class C common stock of Fathom Digital Manufacturing Corporation, a Delaware corporation ("Fathom") in connection with the Business Combination, after which such shares will then automatically convert into Class A common stock of Fathom (the "Class A Common Stock") after which 2,535,000 shares of the Class A Common Stock will be forfeited by the reporting person, in each case, on a one-for-one basis. Following the consummation of the Business Combination, the reporting person holds 5,915,000 shares of Class A Common Stock. Of the 5,915,000 shares of Class A Common Stock held by the reporting person, 1,267,500 shares of Class A Common Stock are subject to vesting restrictions. See Footnote 5 below.
(2) On December 23, 2021, the Issuer consummated its initial business combination with Fathom Holdco, LLC, with Fathom as the surviving entity (the "Business Combination"). In connection with the Business Combination, each Class B Ordinary Share of the Issuer ultimately converted to one share of Class A Common Stock of Fathom.
(3) The Private Placement Warrants were purchased by Altimar Sponsor II, LLC on February 9, 2021 (such date, the "IPO Closing Date"). Each Private Placement Warrant is exercisable for one share of Class A Common Stock at an exercise price of $11.50 per share of Class A Common Stock, subject to certain adjustments. The Private Placement Warrants may be exercised only after February 9, 2022, the date that is twelve months following the IPO Closing Date, and expires five years after the completion of the Issuer's Business Combination or earlier upon redemption or liquidation.
(4) Altimar Sponsor II, LLC (the "Sponsor") is the sponsor entity of the Issuer. The Sponsor is controlled by HPS Investment Partners, LLC.
(5) Includes 1,267,500 shares of Class A Common Stock that constitute the Sponsor's earnout shares (the "Sponsor Earnout Shares"). The Sponsor's Earnout Shares are subject to certain vesting restrictions set forth in that certain Forfeiture and Support Agreement, dated as of July 15, 2021 and amended on November 16, 2021, by and among Issuer, Sponsor, Fathom Holdco, LLC and the other parties thereto.
 
Remarks:
As a result of the Business Combination, the reporting person has ceased to beneficially own more than 10% of the outstanding common stock of the Issuer.

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