Datadog director plans $1.21M stock sale

Datadog, Inc. (DDOG) is the issuer for a notice under Rule 144 filed on behalf of director Julie Richardson covering sales of Class A common stock.

Rhea-AI Filing Summary

Datadog, Inc. (DDOG) is the issuer for a notice under Rule 144 filed on behalf of director Julie Richardson covering sales of Class A common stock. The notice lists 5,625 shares held at Morgan Stanley Smith Barney LLC with an aggregate market value of $1,208,025 as of September 4, 2026, to be sold on NASDAQ. The securities to be sold are tied to the exercise of stock options for 5,625 shares for cash on September 4, 2026, and the remarks state that the securities were previously registered on Form S-8. The filing also notes a prior 10b5-1 sale of 5,625 shares of Class A common stock on September 3, 2026 for $1,237,500.

Key Figures

Shares listed in Rule 144 notice: 5,625 shares Aggregate market value in notice: $1,208,025 10b5-1 sale amount: 5,625 shares +2 more

5 metrics

Shares listed in Rule 144 notice 5,625 shares Class A common stock held at Morgan Stanley Smith Barney LLC

Aggregate market value in notice $1,208,025 5,625 Class A shares as of September 4, 2026

10b5-1 sale amount 5,625 shares Class A common stock sold on September 3, 2026

10b5-1 sale proceeds $1,237,500 Sale of 5,625 Class A shares on September 3, 2026

Date of notice September 4, 2026 Date shown for the Rule 144 notice

Key Terms

Rule 144, 10b5-1, Form S-8, Exercise of Stock Options

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

10b5-1 regulatory

"10b5-1 Sales for JULIE RICHARDSON 620 8th Avenue"

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.

Form S-8 regulatory

"were registered on Form S-8 Date of Notice"

A Form S-8 is a U.S. Securities and Exchange Commission registration that lets a public company set aside shares for employee benefit plans and stock-based compensation. Think of it as opening a dedicated account that authorizes the company to issue or reserve stock for workers and directors; it matters to investors because it enables share dilution when those awards are granted or exercised and signals how management is compensated and incentivized.

Exercise of Stock Options financial

"Exercise of Stock Options | Issuer | | | 5625 |"

FAQ

What does the Form 144 filing disclose for Datadog, Inc. (DDOG)?

It discloses that director Julie Richardson has filed a Rule 144 notice for sales of Datadog Class A common stock, including 5,625 shares related to stock option exercises and an earlier 10b5-1 sale of 5,625 shares.

How many Datadog (DDOG) shares are covered in the current Rule 144 notice?

The notice lists 5,625 shares of Datadog Class A common stock associated with stock options, held at Morgan Stanley Smith Barney LLC, with an aggregate market value of $1,208,025 as of September 4, 2026.

What recent sale activity by Julie Richardson in DDOG shares is reported?

The filing reports a 10b5-1 sale of 5,625 shares of Datadog Class A common stock on September 3, 2026 for total proceeds of $1,237,500.

How were the Datadog (DDOG) shares to be sold acquired?

The notice states the securities to be sold were acquired through exercise of stock options for 5,625 shares for cash on September 4, 2026, and remarks indicate they were registered under Form S-8.

Through which broker and market are the DDOG shares planned to be sold?

The shares are held at Morgan Stanley Smith Barney LLC Executive Financial Services, and the Rule 144 information specifies that the 5,625 shares of Class A common stock are to be sold on NASDAQ.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/04/2026 - 04:33 PM Accepted by SEC EDGAR 09/04/2026 - 04:32 PM Learn about SEC filing dates

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	0001466857
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Datadog, Inc.
SEC File Number	001-39051
Address of Issuer	620 8th Avenue, 45th Floor New York NEW YORK 10018
Phone	8663294466
Name of Person for Whose Account the Securities are To Be Sold	JULIE RICHARDSON
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	Director

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	5625	1208025.00	334904614	09/04/2026	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	09/04/2026	Exercise of Stock Options	Issuer			5625	09/04/2026	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 JULIE RICHARDSON 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	09/03/2026	5625	1237500.00

144: Remarks and Signature

Remarks	Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8
Date of Notice	09/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/04/2026
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	/s/ Julie Richardson
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)