Datadog, Inc. — Director's Dealing 2021

May 5, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2021-05-03

Reporting Person: Pomel Olivier (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-03	Class A Common Stock	C	81088	—	Acquired	328561	Direct
2021-05-03	Class A Common Stock	S	46823	$80.275	Disposed	281738	Direct
2021-05-03	Class A Common Stock	S	13115	$81.3562	Disposed	268623	Direct
2021-05-03	Class A Common Stock	S	5824	$82.5468	Disposed	262799	Direct
2021-05-03	Class A Common Stock	S	9392	$83.2922	Disposed	253407	Direct
2021-05-03	Class A Common Stock	S	4234	$84.2493	Disposed	249173	Direct
2021-05-03	Class A Common Stock	S	900	$84.9884	Disposed	248273	Direct
2021-05-03	Class A Common Stock	S	800	$86.33	Disposed	247473	Direct
2021-05-03	Class A Common Stock	C	17450	—	Acquired	17450	Indirect
2021-05-03	Class A Common Stock	S	9374	$80.2879	Disposed	8076	Indirect
2021-05-03	Class A Common Stock	S	3300	$81.3594	Disposed	4776	Indirect
2021-05-03	Class A Common Stock	S	1400	$82.5607	Disposed	3376	Indirect
2021-05-03	Class A Common Stock	S	2176	$83.3062	Disposed	1200	Indirect
2021-05-03	Class A Common Stock	S	900	$84.2289	Disposed	300	Indirect
2021-05-03	Class A Common Stock	S	300	$84.9967	Disposed	0	Indirect
2021-05-03	Class A Common Stock	C	12500	—	Acquired	12500	Indirect
2021-05-03	Class A Common Stock	S	6602	$80.2738	Disposed	5898	Indirect
2021-05-03	Class A Common Stock	S	2684	$81.3875	Disposed	3214	Indirect
2021-05-03	Class A Common Stock	S	1814	$82.9077	Disposed	1400	Indirect
2021-05-03	Class A Common Stock	S	1000	$83.927	Disposed	400	Indirect
2021-05-03	Class A Common Stock	S	400	$84.87	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-03	Class B Common Stock	$	C	81088	Disposed		Class A Common Stock (81088)	Direct
2021-05-03	Class B Common Stock	$	C	17450	Disposed		Class A Common Stock (17450)	Indirect
2021-05-03	Class B Common Stock	$	C	12500	Disposed		Class A Common Stock (12500)	Indirect

Footnotes

F1: Each share of Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election, 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 nine-month anniversary of 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 14, 2020.

F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.93 to $80.92. 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 $80.93 to $81.92. 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 $81.93 to $82.91. 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 $82.93 to $83.91. 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: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.93 to $84.89. 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.

F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.93 to $85.03. 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: Shares are held by the Olivier Pomel 2018 GRAT.

F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.93 to $80.91. 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 $80.94 to $81.93. 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: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.95 to $82.94. 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.

F13: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.95 to $83.93. 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 $83.97 to $84.49. 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.

F15: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.98 to $85.03. 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: Shares are held by the Pomel Descendents' 2018 Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares.

F17: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.93 to $80.78. 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.

F18: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.94 to $81.93. 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 $82.37 to $83.29. 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 $83.45 to $84.33. 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 $84.49 to $85.03. 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.