X0306 4 2022-01-04 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 2022-01-04 4 S 0 500 149.878 D 151956 D Class A Common Stock 2022-01-04 4 S 0 500 150.94 D 151456 D Class A Common Stock 2022-01-04 4 S 0 400 152.14 D 151056 D Class A Common Stock 2022-01-04 4 S 0 700 153.2286 D 150356 D Class A Common Stock 2022-01-04 4 S 0 1200 154.485 D 149156 D Class A Common Stock 2022-01-04 4 S 0 913 155.6533 D 148243 D Class A Common Stock 2022-01-04 4 S 0 800 156.9225 D 147443 D Class A Common Stock 2022-01-04 4 S 0 1487 158.0075 D 145956 D Class A Common Stock 2022-01-04 4 S 0 900 159.2156 D 145056 D Class A Common Stock 2022-01-04 4 S 0 300 160.5133 D 144756 D Class A Common Stock 2022-01-04 4 S 0 200 161.74 D 144556 D Class A Common Stock 2022-01-04 4 S 0 100 163.44 D 144456 D Class A Common Stock 30000 I By GRAT Shares sold pursuant to a 10b5-1 plan entered into on February 27, 2021. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $149.38 to $150.35. 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 $150.44 to $151.38. 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 $151.76 to $152.36. 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 $152.88 to $153.81. 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 $153.96 to $154.90. 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 $155.25 to $155.95. 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 $156.45 to $157.30. 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 $157.60 to $158.39. 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 $158.84 to $159.62. 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 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $160.05 to $160.91. 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 $161.32 to $162.16. 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 Shares are held directly by the L.I. Kopits November 2021 GRAT, of which the Reporting Person is Trustee. Shares received from Reporting Person on December 1, 2021 in an exempt transfer. Laszlo Kopits, by /s/ Ron A. Metzger, Attorney-in-Fact 2022-01-06