DDOG affiliate files Form 144 for Class A share sales

Morgan Stanley Smith Barney LLC submitted a Form 144 notice relating to proposed and recent sales of Class A Common shares of DDOG.

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC submitted a Form 144 notice relating to proposed and recent sales of Class A Common shares of DDOG. The excerpt lists a proposed block of 12,500 shares and a prior private acquisition of 100,000 shares dated 04/29/2011.

The filing also records multiple 10b5-1 sales by the Callahan-Thernstrom Family Trust and Michael Callahan between 05/15/2026 and 06/29/2026, including sales of 12500, 75000, 37500, and 2500 shares with corresponding proceeds shown in the excerpt.

Insights

Securities Compliance Counsel

Form 144 notice records proposed resale and recent 10b5-1 dispositions by affiliated parties.

The filing lists a proposed sale of 12,500 shares and references a prior issuance of 100,000 shares dated 04/29/2011. It also itemizes completed 10b5-1 plan transactions from 05/15/2026 to 06/29/2026.

These entries are routine compliance disclosures for affiliated resales; cash‑flow treatment and any holding‑period limitations are not specified in the excerpt.

Key Figures

Proposed shares to be sold: 12,500 shares Private acquisition (context): 100,000 shares 10b5-1 sale on 06/29/2026: 12,500 shares +4 more

7 metrics

Proposed shares to be sold 12,500 shares listed under Securities To Be Sold

Private acquisition (context) 100,000 shares Private Acquisition from Issuer or an Affiliate dated 04/29/2011

10b5-1 sale on 06/29/2026 12,500 shares 10b5-1 sale by Callahan-Thernstrom Family Trust

Proceeds shown for 06/29/2026 sale $3,093,375.00 Proceeds corresponding to 12,500-share 10b5-1 sale on 06/29/2026

10b5-1 sales on 06/12/2026 75,000 shares and 37,500 shares Two trust sales listed on 06/12/2026 with proceeds shown

Proceeds for 05/15/2026 sale $527,387.50 Proceeds corresponding to 2,500-share sale by Michael Callahan on 05/15/2026

Exchange NASDAQ Listed exchange for the securities

Key Terms

10b5-1, Form 144, Class A Common, Private Acquisition from Issuer or an Affiliate

4 terms

10b5-1 regulatory

"10b5-1 Sales for Callahan-Thernstrom Family Trust"

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 144 regulatory

"Filer Information | 144: Filer Information"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Class A Common market

"Class A Common | Morgan Stanley Smith Barney LLC"

Private Acquisition from Issuer or an Affiliate other

"Private Acquisition from Issuer or an Affiliate | Issuer"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the DDOG Form 144 disclose?

It discloses proposed and recent affiliate share sales, including a proposed sale of 12,500 shares. The excerpt also lists historical items such as a 100,000 share private acquisition dated 04/29/2011 and multiple 10b5-1 sales between 05/15/2026 and 06/29/2026.

Who executed the recent 10b5-1 sales in the DDOG excerpt?

The Callahan-Thernstrom Family Trust and Michael Callahan executed the 10b5-1 sales. The excerpt shows trust sales on 06/29/2026, 06/12/2026 (two entries) and Michael Callahan on 05/15/2026 with listed share counts and proceeds.

How many shares are listed as proposed for sale in this Form 144?

The excerpt lists a proposed sale of 12,500 shares of Class A Common. The filing also references a 100,000 share private acquisition dated 04/29/2011 as part of the securities history shown.

Do the entries show proceeds from the recent sales?

Yes; the excerpt includes proceeds for listed 10b5-1 transactions, for example $3,093,375.00 for 12,500 shares on 06/29/2026. Other sale rows include share counts and corresponding dollar amounts in the excerpt.

Is the broker or intermediary identified for these sales?

The filing names Morgan Stanley Smith Barney LLC, Executive Financial Services, with an address at 1 New York Plaza. That entity appears under filer information in the excerpt but specific execution details are not provided.

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

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Accepted by SEC EDGAR 07/01/2026 - 04:53 PM EDT 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	0001784030
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	Callahan-Thernstrom Family Trust
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	12500	3254500.00	330825798	07/01/2026	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	04/29/2011	Private Acquisition from Issuer or an Affiliate	Issuer			100000	04/29/2011	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 Callahan-Thernstrom Family Trust 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	06/29/2026	12500	3093375.00
10b5-1 Sales for Callahan-Thernstrom Family Trust 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	06/12/2026	75000	17348985.00
10b5-1 Sales for Callahan-Thernstrom Family Trust 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	06/12/2026	37500	8706172.50
Michael Callahan 620 8th Avenue, 45th Floor New York NY 10018	Class A Common	05/15/2026	2500	527387.50

144: Remarks and Signature

Remarks
Date of Notice	07/01/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	03/13/2026
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/ Michael Callahan
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)