Datadog, Inc. — Director's Dealing 2020

May 22, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2020-05-20

Reporting Person: OBSTLER DAVID M (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-05-20	Class A Common Stock	S	13343	$70.2677	Disposed	311242	Direct
2020-05-20	Class A Common Stock	S	6382	$70.8374	Disposed	304860	Direct
2020-05-20	Class A Common Stock	S	275	$71.7145	Disposed	304585	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Class B Common Stock	$		Class A Common Stock ()	756353	Direct
Class B Common Stock	$		Class A Common Stock ()	607397	Indirect

Footnotes

F1: Shares sold pursuant to a 10b5-1 plan entered into on December 11, 2019.

F2: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $69.63 to $70.62. 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.

F3: Includes 1,073 shares acquired under the Datadog, Inc. 2019 Employee Stock Purchase Plan on May 15, 2020.

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $70.63 to $71.44. 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 $71.66 to $71.78. 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.

F6: 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.

F7: Includes 11,353 shares previously held by the David Obstler 2019 GRAT which were distributed to the Reporting Person on May 15, 2020 in an exempt annuity payment and are now owned directly.

F8: Shares are held directly by the David Obstler 2019 GRAT, of which Reporting Person is Trustee.