X0508 4 2023-09-05 0 0001561550 Datadog, Inc. DDOG 0001861590 Blitzer Adam C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Operating Officer 1 Common A Common Stock 2023-09-05 4 S 0 8428 96.25 D 196360 D Common A Common Stock 2023-09-05 4 S 0 19 97.38 D 196341 D Common A Common Stock 2023-09-05 4 S 0 1 97.42 D 196340 D Common A Common Stock 2023-09-05 4 S 0 2 97.44 D 196338 D Common A Common Stock 2023-09-06 4 S 0 2304 96.3963 D 194034 D Common A Common Stock 2023-09-06 4 S 0 4010 97.0807 D 190024 D Common A Common Stock 2023-09-06 4 S 0 500 97.94 D 189524 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. Includes 344 shares acquired on May 15, 2023 under the Issuer's Employee Stock Purchase Plan. Shares sold pursuant to a 10b5-1 plan adopted on May 12, 2023. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $95.73 to $96.71. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $96.73 to $97.68. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $97.76 to $98.08. 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. Adam Blitzer, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-09-07