144: Filer Information

Filer CIK

0001540517

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

AGARWAL 2018 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

20000

4915400.00

330825798

07/23/2026

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

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 AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

07/16/2026

20000

5230676.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

07/09/2026

20000

5348252.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

07/02/2026

20000

5224412.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

06/25/2026

20000

4402376.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

06/18/2026

20000

4418366.00

Agarwal Jan Family Foundation
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

06/16/2026

10000

2324900.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

06/12/2026

20000

4631192.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

05/11/2026

20000

4002638.00

10b5-1 Sales for A-J-M 2025 NON-EXEMPT TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

05/07/2026

38893

7444057.97

10b5-1 Sales for A-J-K 2025 NON-EXEMPT TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

05/07/2026

38893

7444057.97

10b5-1 Sales for A-J-I 2025 NON-EXEMPT TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

05/07/2026

38896

7444632.17

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

05/04/2026

20000

2894938.00

10b5-1 Sales for AGARWAL 2018 FAMILY TRUST
620 8th Avenue, 45th Floor
New York � NY � 10018

Class A Common

04/27/2026

20000

2629398.00

144: Remarks and Signature

Remarks

The securities to be sold were acquired upon the previous exercise of stock options during the period of 04/07/2021 through 07/14/2021. Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8.

Date of Notice

07/23/2026

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/ Ellen Jan

144: Filer Information

Submission Contact Information

144: Issuer Information

144: Securities Information

144: Securities To Be Sold

144: Securities Sold During The Past 3 Months

144: Remarks and Signature

ATTENTION:

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