Datadog, Inc. — Director's Dealing 2021

May 21, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2021-05-19

Reporting Person: Agarwal Amit (Chief Product Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-19	Common A Common Stock	C	7500	$0.00	Acquired	184657	Direct
2021-05-19	Common A Common Stock	S	910	$81.2341	Disposed	183747	Direct
2021-05-19	Common A Common Stock	S	700	$82.6543	Disposed	183047	Direct
2021-05-19	Common A Common Stock	S	2609	$83.5826	Disposed	180438	Direct
2021-05-19	Common A Common Stock	S	3181	$84.69	Disposed	177257	Direct
2021-05-19	Common A Common Stock	S	100	$85.36	Disposed	177157	Direct
2021-05-19	Common A Common Stock	C	1000	$0.00	Acquired	1000	Indirect
2021-05-19	Common A Common Stock	S	180	$81.0844	Disposed	820	Indirect
2021-05-19	Common A Common Stock	S	120	$82.7542	Disposed	700	Indirect
2021-05-19	Common A Common Stock	S	280	$83.5836	Disposed	420	Indirect
2021-05-19	Common A Common Stock	S	420	$84.6908	Disposed	0	Indirect
2021-05-19	Common A Common Stock	C	12500	$0.00	Acquired	12500	Indirect
2021-05-19	Common A Common Stock	S	1500	$81.2373	Disposed	11000	Indirect
2021-05-19	Common A Common Stock	S	912	$82.6863	Disposed	10088	Indirect
2021-05-19	Common A Common Stock	S	4533	$83.5261	Disposed	5555	Indirect
2021-05-19	Common A Common Stock	S	5455	$84.7136	Disposed	100	Indirect
2021-05-19	Common A Common Stock	S	100	$85.16	Disposed	0	Indirect
2021-05-19	Common A Common Stock	C	2200	$0.00	Acquired	2200	Indirect
2021-05-19	Common A Common Stock	S	300	$81.0767	Disposed	1900	Indirect
2021-05-19	Common A Common Stock	S	300	$82.4567	Disposed	1600	Indirect
2021-05-19	Common A Common Stock	S	923	$83.6965	Disposed	677	Indirect
2021-05-19	Common A Common Stock	S	677	$84.9507	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-19	Class B Common Stock	$	C	7500	Disposed		Class A Common Stock (7500)	Direct
2021-05-19	Class B Common Stock	$	C	1000	Disposed		Class A Common Stock (1000)	Indirect
2021-05-19	Class B Common Stock	$	C	12500	Disposed		Class A Common Stock (12500)	Indirect
2021-05-19	Class B Common Stock	$	C	2200	Disposed		Class A Common Stock (2200)	Indirect

Footnotes

F1: 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.

F2: Shares sold pursuant to a 10b5-1 plan entered into on September 2, 2020.

F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.85 to $81.50. 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.

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.13 to $83.08. 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.

F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.20 to $84.18. 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.

F6: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.21 to $85.14. 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.

F7: Shares are held by Reporting Person's spouse.

F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.81 to $81.52. 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.

F9: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.22 to $83.14. 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.

F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.22 to $84.18. 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.

F11: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.22 to $85.12. 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.

F12: Shares are held directly by Amit Agarwal 2019 GRAT, of which the Reporting Person is Trustee.

F13: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.86 to $81.48. 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.

F14: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.14 to $83.08. 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.

F15: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.15 to $84.13. 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.

F16: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.16 to $85.14. 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.

F17: Shares are held directly by Amit Agarwal 2018 GRAT, of which the Reporting Person is Trustee.

F18: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.86 to $81.28. 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.

F19: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.10 to $83.08. 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.

F20: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.25 to $84.24. 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.

F21: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.67 to $85.19. 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.