Sec Form 4 Filing - CONTOUR VENTURE PARTNERS LP @ Datadog, Inc. - 2020-03-06

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 CONTOUR VENTURE PARTNERS LP 2. Issuer Name and Ticker or Trading Symbol Datadog, Inc. [ DDOG] 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) 475 PARK AVENUE SOUTH, 6TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 03/06/2020 (Street) NEW YORK, NY10016 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) _____ Form filed by One Reporting Person __ X __ 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 03/06/2020 J 4,240,627 A 4,240,627 ( 1 ) D Class A Common Stock 03/06/2020 J 4,240,627 ( 1 ) D 0 ( 1 ) D

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 B Common Stock ( 3 ) 03/09/2020 J 4,240,627 ( 1 ) ( 2 ) ( 3 ) ( 3 ) Class A Common Stock 4,240,627 $ 0 273,001 D ( 4 )

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other CONTOUR VENTURE PARTNERS LP 475 PARK AVENUE SOUTH, 6TH FLOOR NEW YORK, NY10016 X Contour Opportunity Fund, L.P. 475 PARK AVENUE SOUTH, 6TH FLOOR NEW YORK, NY10016 X Signatures Contour Venture Partners, L.P. by /s/ Matt Gorin, Managing Partner 03/10/2020 Signature of Reporting Person Date Contour Opportunity Fund, L.P., by /s/ Matt Gorin, Managing Partner 03/10/2020 Signature of Reporting Person Date

Explanation of Responses:

( 1 )Following the lock-up expiration on March 6, 2020, the Reporting Persons' Class B Common Stock, which was previously subject to a lock-up restriction, was released from such restriction and converted to Class A Common Stock (the "Converted Shares"), with 3,148,623 of the Converted Shares owned by Contour Venture Partners, L.P. and 1,365,005 of the Converted Shares owned by Contour Opportunity Fund, L.P. ( 2 )Contour Venture Partners, L.P. distributed 3,148,623 of the Converted Shares in a pro rata distribution to its limited partners and Contour Opportunity Fund, L.P. distributed 1,092,004 of the Converted Shares in a pro rata distribution to its limited partners. ( 3 )Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earlier of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, and (ii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. ( 4 )273,001 shares are owned by Contour Opportunity Fund, L.P. following the distribution of the Converted Shares.

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