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SEC FORM 4SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

OBSTLER DAVID M

(Last)

(First)

(Middle)

C/O DATADOG, INC.

620 8TH AVENUE, 45TH FLOOR

(Street)

NEW YORK

10018

(City)

(State)

(Zip)

2. Issuer Name and Ticker or Trading Symbol
Datadog, Inc. [ DDOG ]
Foreign Trading Symbol

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	10% Owner
	Officer (give title below)	Other (specify below)
Chief Financial Officer

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Class A Common Stock	09/14/2026		C⁽¹⁾		12,000	A	$0	12,000	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		798	D	$221.2365⁽⁴⁾	11,202	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,624	D	$222.1661⁽⁵⁾	9,578	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		738	D	$223.1165⁽⁶⁾	8,840	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		545	D	$224.3433⁽⁷⁾	8,295	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,182	D	$225.1332⁽⁸⁾	7,113	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		190	D	$226.1915⁽⁹⁾	6,923	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		169	D	$227.7159⁽¹⁰⁾	6,754	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		360	D	$228.5859⁽¹¹⁾	6,394	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		2,873	D	$229.9209⁽¹²⁾	3,521	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,689	D	$230.5094⁽¹³⁾	1,832	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		724	D	$231.5317⁽¹⁴⁾	1,108	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		918	D	$232.7079⁽¹⁵⁾	190	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		S⁽³⁾		190	D	$233.2997⁽¹⁶⁾	0	I	By Trust⁽²⁾
Class A Common Stock	09/14/2026		C⁽¹⁾		12,000	A	$0	12,000	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		786	D	$221.2389⁽⁴⁾	11,214	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,635	D	$222.1623⁽⁵⁾	9,579	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		725	D	$223.1157⁽⁶⁾	8,854	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		525	D	$224.3448⁽⁷⁾	8,329	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,169	D	$225.1313⁽⁸⁾	7,160	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		181	D	$226.1915⁽⁹⁾	6,979	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		163	D	$227.7183⁽¹⁰⁾	6,816	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		358	D	$228.5972⁽¹¹⁾	6,458	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		2,935	D	$229.9168⁽¹²⁾	3,523	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		1,729	D	$230.5063⁽¹⁸⁾	1,794	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		713	D	$231.5314⁽¹⁴⁾	1,081	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		899	D	$232.7071⁽¹⁵⁾	182	I	By Trust⁽¹⁷⁾
Class A Common Stock	09/14/2026		S⁽³⁾		182	D	$233.2996⁽¹⁶⁾	0	I	By Trust⁽¹⁷⁾

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
Class B Common Stock	⁽¹⁾	09/14/2026		C			12,000	⁽¹⁾	⁽¹⁾	Class A Common Stock	12,000	$0	34,199	I	By Trust⁽²⁾
Class B Common Stock	⁽¹⁾	09/14/2026		C			12,000	⁽¹⁾	⁽¹⁾	Class A Common Stock	12,000	$0	34,198	I	By Trust⁽¹⁷⁾
Class B Common Stock	⁽¹⁾							⁽¹⁾	⁽¹⁾	Class A Common Stock	8,103		8,103	D

Explanation of Responses:

1. Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock.

2. Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's child, of which the Reporting Person's spouse is Trustee. Obstler Children 2019 Trust FBO the Reporting Person's child and Obstler Children 2019 Trust FBO the Reporting Person's other child are separate trusts for the benefit of the Reporting Person's children with substantially identical terms.

3. Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.

4. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $220.67 to $221.57. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

5. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $221.68 to $222.65. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

6. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $222.70 to $223.60. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

7. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $223.82 to $224.81. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

8. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $224.82 to $225.78. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

9. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.96 to $226.54. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

10. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.095 to $228.07. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

11. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.13 to $229.12. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

12. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.13 to $230.12. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

13. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.13 to $231.11. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

14. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.13 to $232.10. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

15. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.13 to $233.12. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

16. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.13 to $233.49. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

17. Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's other child, of which the Reporting Person's spouse is Trustee. See Footnote 2.

18. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.13 to $231.10. The Reporting Person will provide upon request to the SEC, the Issuer or security holder of the Issuer, full information regarding the number of shares sold at each separate price.

Remarks:

Due to the 30 line limitation in Table I, this report is being filed across two forms. This is the second of two filings.

	/s/ Kerry Acocella, Attorney-in-Fact	09/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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