United States

Securities and Exchange Commission

Washington, D.C. 20549

Schedule 13G

(Rule 13d-102)

Information to be Included in Statements Filed Pursuant

to § 240.13d-1(b), (c) and (d) and Amendments Thereto Filed

Pursuant to § 240.13d-2

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No.    )*

Datadog, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

23804L103

(CUSIP Number)

March 13, 2020

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

o   Rule 13d-1(b)

x   Rule 13d-1(c)

o   Rule 13d-1(d)

* 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 the disclosures provided in a prior cover page.

The information required in 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).

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ITEM 1.                   (a)           Name of Issuer:

Datadog, Inc. (the “Issuer”)

(b)                                 Address of Issuer’s Principal Executive Offices:

620 8th Avenue, 45th Floor, New York, NY

ITEM 2.                   (a)           Name of Person Filing:

Each of the following is hereinafter individually referred to as a “Reporting Person” and collectively as the “Reporting Persons.”  This statement is filed on behalf of:

Enfield Investments Holdings Corp. (“Enfield”)

LBB Foundation

Leonid Boguslavskiy

(b)                                 Address or Principal Business Office:

The principal business address for each Reporting Person is as follows:

Enfield: 3 Afentrikas, Office 101, 6018 Larnaca, Cyprus;

LBB Foundation: c/o Fundationsanstalt, Heligkreuz 6, 9490, Vaduz, Liechtenstein; and

Leonid Boguslavskiy: via Piana 3, 50124 Firenze, Italy.

(c)                                  Citizenship of each Reporting Person is:

Enfield is a corporation organized under the laws of the British Virgin Islands with an established branch in Cyprus and tax resident of Cyprus

LBB Foundation is a discretionary foundation organized under the laws of Liechtenstein.

Leonid Boguslavskiy is a citizen of Russia and Canada.

(d)                                 Title of Class of Securities:

Class A Common stock, par value $0.00001 per share (“Common Stock”).

(e)                                  CUSIP Number:

23804L103

ITEM 3.

Not applicable.

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ITEM 4.                   Ownership.

(a-c)

The ownership information presented below represents beneficial ownership of Common Stock of the Issuer as of March 20, 2020, based upon the Issuer’s disclosure to the Reporting Persons that 140,492,078 shares of Common Stock were outstanding as of March 13, 2020.

Enfield is the record holder of 10,872,260 shares of Common Stock of the Issuer and 7,370,681 of the Issuer’s Class B shares. The Class B shares are convertible into shares of Common Stock on a one-for-one basis, provided, however, that Enfield may not convert any Class B shares to the extent that such conversion would cause the Reporting Persons to beneficially own more than 9.99% of the Issuer’s then outstanding Common Stock.

Enfield is a wholly owned subsidiary of LBB Foundation, whose sole beneficiary is Leonid Boguslavskiy. As a result, each of LBB Foundation and Mr. Boguslavskiy may be deemed to beneficially own the shares of Common Stock beneficially owned by Enfield.

ITEM 5.                   Ownership of Five Percent or Less of a Class.

Not applicable.

ITEM 6.                   Ownership of More than Five Percent on Behalf of Another Person.

Not applicable.

ITEM 7.                   Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on By the Parent Holding Company.

Not applicable.

ITEM 8.                   Identification and Classification of Members of the Group.

Not applicable.

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ITEM 9.                   Notice of Dissolution of Group.

Not applicable.

ITEM 10.            Certification.

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under §240.14a-11.

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SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

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LIST OF EXHIBITS

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Exhibit 99

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13G. Each of them is responsible for the timely filing of such statement and any amendments thereto, and for the completeness and accuracy of the information concerning such person contained therein; but none of them is responsible for the completeness or accuracy of the information concerning the other persons making the filing, unless such person knows or has reason to believe that such information is inaccurate.

IN WITNESS WHEREOF, the undersigned hereby execute this Joint Filing Agreement as of the 23rd day of March, 2020.