Datadog, Inc. — Director's Dealing 2021

Jan 27, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2021-01-25

Reporting Person: OBSTLER DAVID M (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-12-15	Class A Common Stock	G	40000	$0.00	Disposed	78335	Direct
2021-01-25	Class A Common Stock	C	300000	$0.00	Acquired	300000	Indirect
2021-01-25	Class A Common Stock	S	723	$105.0657	Disposed	299277	Indirect
2021-01-25	Class A Common Stock	S	13975	$106.0008	Disposed	285302	Indirect
2021-01-25	Class A Common Stock	S	10342	$107.1733	Disposed	274960	Indirect
2021-01-25	Class A Common Stock	S	8464	$108.0566	Disposed	266496	Indirect
2021-01-25	Class A Common Stock	S	14846	$109.0984	Disposed	251650	Indirect
2021-01-25	Class A Common Stock	S	36173	$110.1349	Disposed	215477	Indirect
2021-01-25	Class A Common Stock	S	5377	$110.7334	Disposed	210100	Indirect
2021-01-25	Class A Common Stock	S	100	$111.65	Disposed	210000	Indirect

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-01-25	Class B Common Stock	$	C	300000	Disposed		Class A Common (300000)	Indirect

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock (55603)	55603	Direct

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 are held directly by the David Obstler 2019 GRAT, of which Reporting Person is Trustee.

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

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $104.52 to $105.50. 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.

F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $105.52 to $106.50. 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.

F6: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $106.55 to $107.54. 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.

F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $107.56 to $108.55. 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 $108.56 to $109.55. 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 $109.56 to $110.53. 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 $110.57 to $111.29. 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.

F11: Reflects exempt annuity payment of 11,353 shares from David Obstler 2019 GRAT to Reporting Person on May 15, 2020.