X0306 4 2020-12-11 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 2020-12-11 4 C 0 10084 0.00 A 173705 D Class A Common Stock 2020-12-15 5 G 0 E 10084 0.00 D 163621 D Class A Common Stock 2021-02-01 4 C 0 247528 A 411149 D Class A Common Stock 2021-02-01 4 S 0 44131 101.4211 D 367018 D Class A Common Stock 2021-02-01 4 S 0 161257 102.0576 D 205761 D Class A Common Stock 2021-02-01 4 S 0 31406 103.1019 D 174355 D Class A Common Stock 2021-02-01 4 S 0 10434 104.0024 D 163921 D Class A Common Stock 2021-02-01 4 S 0 300 104.8667 D 163621 D Class A Common Stock 2021-02-01 4 C 0 67400 A 67400 I By GRAT Class A Common Stock 2021-02-01 4 S 0 20884 101.5294 D 46516 I By GRAT Class A Common Stock 2021-02-01 4 S 0 39411 102.089 D 7105 I By GRAT Class A Common Stock 2021-02-01 4 S 0 5405 103.145 D 1700 I By GRAT Class A Common Stock 2021-02-01 4 S 0 1700 104.0647 D 0 I By GRAT Class A Common Stock 2021-02-01 4 C 0 50000 A 50000 I By Trust Class A Common Stock 2021-02-01 4 S 0 15484 101.53 D 34516 I By Trust Class A Common Stock 2021-02-01 4 S 0 29216 102.0864 D 5300 I By Trust Class A Common Stock 2021-02-01 4 S 0 4000 103.135 D 1300 I By Trust Class A Common Stock 2021-02-01 4 S 0 1300 103.9785 D 0 I By Trust Class A Common Stock 2021-02-02 4 C 0 74272 A 237893 D Class A Common Stock 2021-02-02 4 S 0 5991 103.3491 D 231902 D Class A Common Stock 2021-02-02 4 S 0 10700 104.07 D 221202 D Class A Common Stock 2021-02-02 4 S 0 11623 105.1895 D 209597 D Class A Common Stock 2021-02-02 4 S 0 42957 106.1705 D 166622 D Class A Common Stock 2021-02-02 4 S 0 3001 106.8273 D 163621 D Class B Common Stock 2020-12-11 4 C 0 10084 0.00 D Class A Common Stock 10084 10872084 D Class B Common Stock 2021-02-01 4 C 0 247528 0.00 D Class A Common Stock 247528 10624556 D Class B Common Stock 2021-02-01 4 C 0 67400 0.00 D Class A Common Stock 67400 3780400 I By GRAT Class B Common Stock 2021-02-01 4 C 0 50000 0.00 D Class A Common Stock 50000 100000 I By Trust Class B Common Stock 2021-02-02 4 C 0 74272 0.00 D Class A Common Stock 74272 10550284 D 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 September 14, 2020. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $100.70 to $101.695. 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 $101.70 to $102.69. 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 $102.71 to $103.69. 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 $103.72 to $104.43. 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 $104.74 to $104.93. 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 $100.77 to $101.76. 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 $101.77 to $102.75. 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 $102.77 to $103.69. 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 $103.80 to $104.75. 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 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $100.77 to $101.76. 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 $101.77 to $102.76. 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 $102.78 to $103.69. 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 $103.80 to $104.38. 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 $102.72 to $103.71. 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 $103.72 to $104.68. 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 $104.72 to $105.71. 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 $105.72 to $106.71. 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 $106.73 to $107.12. 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 2021-02-03