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: Le-Quoc Alexis (Director, President & CTO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-05-03	Class A Common Stock	C	79551	—	Acquired	79551	Indirect
2021-05-03	Class A Common Stock	S	45564	$80.2687	Disposed	33987	Indirect
2021-05-03	Class A Common Stock	S	13412	$81.3524	Disposed	20575	Indirect
2021-05-03	Class A Common Stock	S	6118	$82.5923	Disposed	14457	Indirect
2021-05-03	Class A Common Stock	S	8490	$83.3131	Disposed	5967	Indirect
2021-05-03	Class A Common Stock	S	4467	$84.2671	Disposed	1500	Indirect
2021-05-03	Class A Common Stock	S	700	$85.0131	Disposed	800	Indirect
2021-05-03	Class A Common Stock	S	800	$86.33	Disposed	0	Indirect
2021-05-03	Class A Common Stock	C	14201	—	Acquired	14201	Indirect
2021-05-03	Class A Common Stock	S	7531	$80.2804	Disposed	6670	Indirect
2021-05-03	Class A Common Stock	S	2760	$81.3409	Disposed	3910	Indirect
2021-05-03	Class A Common Stock	S	900	$82.4922	Disposed	3010	Indirect
2021-05-03	Class A Common Stock	S	2010	$83.2926	Disposed	1000	Indirect
2021-05-03	Class A Common Stock	S	700	$84.2629	Disposed	300	Indirect
2021-05-03	Class A Common Stock	S	300	$84.9833	Disposed	0	Indirect
2021-05-03	Class A Common Stock	C	12500	—	Acquired	12500	Indirect
2021-05-03	Class A Common Stock	S	6769	$80.2863	Disposed	5731	Indirect
2021-05-03	Class A Common Stock	S	2152	$81.3531	Disposed	3579	Indirect
2021-05-03	Class A Common Stock	S	1300	$82.5792	Disposed	2279	Indirect
2021-05-03	Class A Common Stock	S	1379	$83.3286	Disposed	900	Indirect
2021-05-03	Class A Common Stock	S	800	$84.3725	Disposed	100	Indirect
2021-05-03	Class A Common Stock	S	100	$85.03	Disposed	0	Indirect
2021-05-03	Class A Common Stock	C	12500	—	Acquired	12500	Indirect
2021-05-03	Class A Common Stock	S	6666	$80.3003	Disposed	5834	Indirect
2021-05-03	Class A Common Stock	S	2400	$81.3575	Disposed	3434	Indirect
2021-05-03	Class A Common Stock	S	1434	$82.6713	Disposed	2000	Indirect
2021-05-03	Class A Common Stock	S	1100	$83.4073	Disposed	900	Indirect
2021-05-03	Class A Common Stock	S	600	$84.1983	Disposed	300	Indirect
2021-05-03	Class A Common Stock	S	300	$85.0167	Disposed	0	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-05-03	Class B Common Stock	$	C	79551	Disposed		Class A Common Stock (79551)	Indirect
2021-05-03	Class B Common Stock	$	C	14201	Disposed		Class A Common Stock (14201)	Indirect
2021-05-03	Class B Common Stock	$	C	12500	Disposed		Class A Common Stock (12500)	Indirect
2021-05-03	Class B Common Stock	$	C	12500	Disposed		Class A Common Stock (12500)	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	177157	Direct

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 are held by the Alexis Le-Quoc Revocable Trust.

F3: Shares sold pursuant to a 10b5-1 plan entered into on September 14, 2020.

F4: 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.

F5: 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.

F6: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.94 to $82.93. 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.

F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.94 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.

F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $83.94 to $84.93. 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.

F9: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.98 to $85.10. 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.

F10: Shares are held by the Alexis Le-Quoc 2016 GRAT.

F11: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.93 to $80.88. 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 $80.93 to $81.88. 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 $81.94 to $82.84. 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 $82.95 to $83.77. 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 $83.95 to $84.57. 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.

F16: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.96 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.

F17: Shares are held by Offbeat Polymath Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares.

F18: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.95 to $80.94. 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.

F19: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.96 to $81.86. 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 $81.97 to $82.95. 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 $82.97 to $83.95. 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.

F22: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.02 to $84.98. 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.

F23: Shares are held by Endearing Viceroy Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares.

F24: 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.

F25: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $80.94 to $81.90. 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.

F26: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.96 to $82.95. 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.

F27: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.99 to $83.98. 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.

F28: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $84.01 to $84.39. 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.

F29: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $85.01 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.