X0306 4 2020-09-23 0 0001561550 Datadog, Inc. DDOG 0001120741 OBSTLER DAVID M C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 0 1 0 0 Chief Financial Officer Class A Common Stock 2020-09-23 4 S 0 8946 91.1998 D 443639 D Class A Common Stock 2020-09-23 4 S 0 3763 92.1789 D 439876 D Class A Common Stock 2020-09-23 4 S 0 14004 93.2722 D 425872 D Class A Common Stock 2020-09-23 4 S 0 8187 94.0644 D 417685 D Class A Common Stock 2020-09-23 4 S 0 100 94.78 D 417585 D Shares sold pursuant to a 10b5-1 plan entered into on December 11, 2019. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $90.69 to $91.68. 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 $91.71 to $92.70. 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 $92.72 to $93.71. 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 $93.73 to $94.65. 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. David Obstler, by /s/ Ron A. Metgzer, Attorney-in-Fact 2020-09-25