Datadog (NASDAQ: DDOG) affiliate 10b5-1 share sales disclosed in Form 144

Rhea-AI Filing Summary

Datadog affiliate submitted a Form 144 notice for proposed sales of Class A Common stock under existing plans. The excerpt lists multiple 10b5-1 sales by Sean Walters on 03/02/2026, 03/11/2026, and 05/05/2026 with share counts of 32,118, 22,330, and 1,914 respectively and reported proceeds in dollar amounts alongside each sale date.

Insights

Equity Securities Counsel

Notice of proposed resale activity by an affiliate under 10b5-1 plans.

The filing excerpt lists multiple proposed or reported brokered sales of Class A Common shares executed pursuant to 10b5-1 plans and references RSU/PSU instruments as the source. The listed dates and share counts provide the transaction-level disclosure required for resale notices.

Cash‑flow treatment and aggregate registration context are not shown in the excerpt; subsequent filings or broker confirmations would specify settlement and any issuer proceeds if applicable.

Key Figures

Sale date: 03/02/2026 Shares sold: 32,118 shares Shares sold: 22,330 shares +4 more

7 metrics

Sale date 03/02/2026 largest listed sale row

Shares sold 32,118 shares sale on 03/02/2026 by Sean Walters

Shares sold 22,330 shares sale on 03/11/2026 by Sean Walters

Shares sold 1,914 shares sale on 05/05/2026 by Sean Walters

Proceeds reported $3,550,192.04 proceeds associated with 03/02/2026 sale row

Proceeds reported $2,806,479.06 proceeds associated with 03/11/2026 sale row

Proceeds reported $287,100.00 proceeds associated with 05/05/2026 sale row

Key Terms

10b5-1, RSU/PSU, Class A Common

3 terms

10b5-1 regulatory

"10b5-1 Sales for SEAN WALTERS"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

RSU/PSU financial

"RSU/PSU | Issuer"

Class A Common market

"Class A Common | Morgan Stanley Smith Barney LLC"

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	7657	1100387.47	328274648	05/07/2026	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 *
Common	03/01/2026	RSU/PSU	Issuer			7657	03/01/2026	N/A

* 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 SEAN WALTERS 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	05/05/2026	1914	287100.00
10b5-1 Sales for SEAN WALTERS 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	03/11/2026	22330	2806479.06
SEAN WALTERS 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	03/02/2026	32118	3550192.04

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 Datadog (DDOG) Form 144 disclose?

The Form 144 excerpt discloses proposed or reported sales of Class A Common shares. It lists 10b5-1 sales by Sean Walters on 03/02/2026, 03/11/2026, and 05/05/2026 with specific share counts and dollar amounts.

Who executed the sales reported on the DDOG Form 144?

The excerpt identifies Sean Walters as the selling affiliate. It lists multiple brokered 10b5-1 sales with addresses and per-sale share counts on the dates provided in the filing excerpt.

How many shares were sold in the largest listed trade on the excerpt?

The largest listed trade in the excerpt shows 32,118 shares sold on 03/02/2026. Each sale row in the excerpt pairs a sale date with the number of shares and an associated dollar amount.

Are the sold shares from grants or insider holdings for DDOG?

The excerpt references RSU/PSU as the instrument type and lists the issuer as the source. It shows sales under 10b5-1 plans, indicating transfers tied to equity awards or planned trading, as stated in the rows.