Datadog, Inc. — Director's Dealing 2021

Apr 9, 2021

SEC Form 4/A — Form 4/A

Issuer: Datadog, Inc. (DDOG)
CIK: 0001561550
Period of Report: 2020-08-13

Reporting Person: Callahan Michael James (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-08-13	Class A Common Stock	S	1006	$77.5575	Disposed	107652	Indirect
2020-08-13	Class A Common Stock	S	200	$78.81	Disposed	107452	Indirect
2020-08-13	Class A Common Stock	S	900	$80.2789	Disposed	106552	Indirect
2020-08-13	Class A Common Stock	S	769	$81.3483	Disposed	105783	Indirect
2020-08-13	Class A Common Stock	S	4693	$82.3899	Disposed	101090	Indirect
2020-08-13	Class A Common Stock	S	900	$83.2167	Disposed	100190	Indirect
2020-08-13	Class A Common Stock	S	1532	$84.1169	Disposed	98658	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Class A Common Stock	2301	Direct
Class A Common Stock	20000	Indirect

Footnotes

F1: Shares sold pursuant to a 10b5-1 plan entered into on June 14, 2020.

F2: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $77.22 to $77.80. 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: The Shares are held by The Callahan-Thernstrom Family Trust (the "Family Trust"), of which Reporting Person is Trustee. The Shares were donated by the Reporting Person to the Family Trust in an exempt transfer on July 29, 2020.

F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $78.68 to $78.94. 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.

F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $79.79 to $80.74. 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 $80.87 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.

F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $81.88 to $82.86. 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.

F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $82.93 to $83.85. 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 $83.93 to $84.58. 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 Michael Callahan Grantor Retained Annuity Trust, of which Reporting Person is Trustee.