X0306 4 2021-09-02 0 0001561550 Datadog, Inc. DDOG 0001783569 Kopits Laszlo C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 General Counsel Class A Common Stock 2021-09-02 4 S 0 1053 136.34 D 96423 D The Reporting Person was required by the Issuer to sell only the number of shares of common stock necessary to cover applicable tax withholding obligations realized upon the vesting of restricted stock units, as well as any related brokerage commission fees. Laszlo Kopits, by /s/ Ron A. Metzger, Attorney-in-Fact 2021-09-07