Affiliate files notice to sell 23,186 Class A shares — Datadog (NASDAQ: DDOG)

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC filed a Rule 144 notice reporting the proposed sale of 23,186 shares of Class A Common Stock of DDOG tied to restricted stock units and performance stock units vesting on 03/01/2026.

The excerpt also shows a prior sale by Yanbing Li of 6,715 Class A shares on 12/02/2025 for $1,064,988.93.

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 Stock	Morgan Stanley Smith Barney LLC Executive Services 200 W Civic Center Dr - 4th Floor Sandy UT 84070	23186	2643204	328274648	03/02/2026	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 Stock	03/01/2026	Restricted Stock Units and Performance Stock Units vesting	Issuer			23186	03/01/2026	Compensation

* 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
Yanbing Li 620 8th Avenue, 45th floor New York NY 10018	Class A Common Stock	12/02/2025	6715	1064988.93

144: Remarks and Signature

Remarks

Date of Notice

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 the Form 144 for DDOG report?

It reports a proposed sale of 23,186 Class A shares. The notice ties the shares to restricted stock units and performance stock units vesting on 03/01/2026, and the broker listed is Morgan Stanley Smith Barney LLC.

Who is the broker or filer listed on the DDOG Form 144?

The filer is Morgan Stanley Smith Barney LLC Executive Services. The filing lists the broker address as 200 W Civic Center Dr, Sandy, UT, and NASDAQ as the market for the Class A Common Stock.

Did any related party sell DDOG shares recently?

Yes — Yanbing Li sold 6,715 Class A shares on 12/02/2025. The reported aggregate sale value for that transaction was $1,064,988.93 as shown in the excerpt.

What type of securities are being sold under this notice?

Class A Common Stock tied to RSUs and PSUs. The filing specifies the shares arise from restricted stock units and performance stock units vesting on 03/01/2026 and are listed as compensation stock.

When will the reported RSUs/PSUs vest for the DDOG shares noted?

The RSUs and PSUs vest on 03/01/2026. The filing links the 23,186 Class A shares to those awards and lists the proposed sale date in the Form 144 notice.