Datadog (DDOG) Form 144: 20,000 Class A shares proposed sale reported

Rhea-AI Filing Summary

Datadog reporting a Form 144 notice for the proposed sale of 20,000 Class A common shares, listed with an aggregate amount of $2,515,000.00 and a reference date of 03/09/2026. The filing shows multiple recent 10b5-1 plan sales of Class A common shares in Dec 2025–Jan 2026, with individual trade examples such as 11,111 and 5,551 share transactions on specific dates.

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Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Class A Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	20000	2515000.00	328274648	03/09/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Class A Common	04/07/2021	Previously Exercised Stock Options	Issuer			20000	04/07/2021	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/06/2026	5551	746937.56
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/06/2026	5551	746834.32
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/06/2026	5548	746554.97
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/05/2026	11111	1488038.45
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/05/2026	11111	1488052.90
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	01/05/2026	11111	1488027.34
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/22/2025	11111	1580679.75
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/22/2025	11111	1580754.19
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/22/2025	11111	1580766.41
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/19/2025	11111	1555556.67
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/19/2025	11111	1555774.44
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/19/2025	11111	1555735.55
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/18/2025	11111	1541015.70
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/18/2025	11111	1541076.81
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/18/2025	11111	1541119.03
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/17/2025	11111	1532701.34
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/17/2025	11111	1532560.23
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/17/2025	11111	1532616.90
10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/16/2025	11112	1560263.70
10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/16/2025	11112	1560055.91
10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	12/16/2025	11112	1560430.38

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does DDOG's Form 144 report show about the current proposed sale?

The Form 144 lists a proposed sale of 20,000 Class A common shares with an aggregate amount of $2,515,000.00. The filing is dated 03/09/2026 and references Nasdaq as the market for the shares.

Who is listed as the holder or broker in the DDOG Form 144 filing?

The filing lists Morgan Stanley Smith Barney LLC Executive Financial Services (address shown) as the broker/agent associated with the securities. The entry ties the 20,000 Class A common shares to that intermediary in the filing's header.

Does the filing show recent 10b5-1 plan sales for DDOG and examples?

Yes; the excerpt lists multiple 10b5-1 plan sales in Dec 2025–Jan 2026. Representative examples include 11,111 shares on 12/22/2025 and 5,551 shares on 01/06/2026, each with listed aggregate proceeds in the filing.

What outstanding share count appears in the filing for context?

The filing includes a reference number of 328,274,648 alongside the securities line with the date 03/09/2026. This number appears in the header area as a context figure associated with the Class A common entry.