X0306 4 2021-12-14 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 2021-12-14 4 C 0 145472 0.00 A 387138 D Class A Common Stock 2021-12-14 4 S 0 15379 154.3669 D 371759 D Class A Common Stock 2021-12-14 4 S 0 13995 155.307 D 357764 D Class A Common Stock 2021-12-14 4 S 0 14700 156.2764 D 343064 D Class A Common Stock 2021-12-14 4 S 0 25193 157.158 D 317871 D Class A Common Stock 2021-12-14 4 S 0 17878 158.2626 D 299993 D Class A Common Stock 2021-12-14 4 S 0 12860 159.2017 D 287133 D Class A Common Stock 2021-12-14 4 S 0 11910 160.5355 D 275223 D Class A Common Stock 2021-12-14 4 S 0 20905 161.1662 D 254318 D Class A Common Stock 2021-12-14 4 S 0 9191 162.4397 D 245127 D Class A Common Stock 2021-12-14 4 S 0 3461 163.1848 D 241666 D Class A Common Stock 2021-12-14 4 C 0 60750 0.00 A 62070 I By GRAT Class A Common Stock 2021-12-14 4 S 0 8824 154.2612 D 53246 I By GRAT Class A Common Stock 2021-12-14 4 S 0 6961 155.3202 D 46285 I By GRAT Class A Common Stock 2021-12-14 4 S 0 8261 156.2265 D 38024 I By GRAT Class A Common Stock 2021-12-14 4 S 0 5873 157.2174 D 32151 I By GRAT Class A Common Stock 2021-12-14 4 S 0 6725 158.3031 D 25426 I By GRAT Class A Common Stock 2021-12-14 4 S 0 5394 159.239 D 20032 I By GRAT Class A Common Stock 2021-12-14 4 S 0 6975 160.6955 D 13057 I By GRAT Class A Common Stock 2021-12-14 4 S 0 6736 161.3009 D 6321 I By GRAT Class A Common Stock 2021-12-14 4 S 0 3933 162.5341 D 2388 I By GRAT Class A Common Stock 2021-12-14 4 S 0 1068 163.1982 D 1320 I By GRAT Class B Common Stock 2021-12-14 4 C 0 145472 0.00 D Class A Common Stock 145472 8596798 D Class B Common Stock 2021-12-14 4 C 0 60750 0.00 D Class A Common Stock 60750 3339930 I By GRAT 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 June 14, 2021. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $153.82 to $154.81. 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 $154.82 to $155.81. 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 $155.82 to $156.80. 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 $156.83 to $157.82. 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 $157.83 to $158.81. 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 $158.84 to $159.78. 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 $159.87 to $160.86. 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 $160.87 to $161.82. 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 $161.88 to $162.85. 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 $162.93 to $163.48. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $153.75 to $154.73. 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 $154.82 to $155.81. 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 $155.84 to $156.82. 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 $156.85 to $157.76. 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 $157.85 to $158.78. 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 $158.90 to $159.79. 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 $159.95 to $160.94. 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 $160.98 to $161.96. 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 $162.03 to $163.00. 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 $163.04 to $163.61. 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. Olivier Pomel, by /s/ Ron A. Metzger, Attorney-in-Fact 2021-12-16