X0306 4 2020-11-03 0 0001561550 Datadog, Inc. DDOG 0001783990 Pomel Olivier C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 Chief Executive Officer Class A Common Stock 2020-11-03 4 C 0 195657 A 359278 D Class A Common Stock 2020-11-03 4 S 0 1700 86.9553 D 357578 D Class A Common Stock 2020-11-03 4 S 0 2405 88.2156 D 355173 D Class A Common Stock 2020-11-03 4 S 0 18905 89.5154 D 336268 D Class A Common Stock 2020-11-03 4 S 0 172647 90.1284 D 163621 D Class A Common Stock 2020-11-03 4 C 0 2809 A 2809 I By GRAT Class A Common Stock 2020-11-03 4 S 0 2809 90.00 D 0 I By GRAT Class A Common Stock 2020-11-03 4 C 0 533 A 533 I By Trust Class A Common Stock 2020-11-03 4 S 0 533 90.00 D 0 I By Trust Class B Common Stock 2020-11-03 4 C 0 195657 0.00 D Class B Common Stock 195657 11525768 D Class B Common Stock 2020-11-03 4 C 0 2809 0.00 D Class B Common Stock 2809 3982600 I By GRAT Class B Common Stock 2020-11-03 4 C 0 533 0.00 D Class B Common Stock 533 250000 I By Trust Each share of Class B Common Stock is convertible into an equal number of shares of Class A Common Stock at any time, at the holder's election, and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the nine-month anniversary of the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock. Shares sold pursuant to a 10b5-1 plan entered into on December 7, 2019. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $86.54 to $87.51. 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 $87.56 to $88.55. 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 $88.80 to $89.795. 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 $89.80 to $90.70. 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. Shares are held by the Olivier Pomel 2018 GRAT. Shares are held by the Pomel Descendents' 2018 Trust. Reporting Person disclaims beneficial ownership of these shares except to the extent of his pecuniary interest, if any, in the shares. Shares sold pursuant to a 10b5-1 plan entered into on September 14, 2020. Olivier Pomel, by /s/ Ron A. Metzger, Attorney-in-Fact 2020-11-04