X0306 4 2022-03-02 0 0001561550 Datadog, Inc. DDOG 0001903975 Acocella Kerry C/O DATADOG, INC. 620 EIGHTH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 General Counsel/Corp Secy Class A Common Stock 2022-03-02 4 S 0 268 157.8336 D 47115 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. Kerry Acocella, by /s/ Ron A. Metzger, Attorney-in-Fact 2022-03-04