X0306 4 2021-02-01 0 0001561550 Datadog, Inc. DDOG 0001783984 Le-Quoc Alexis C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 1 0 0 President & CTO Class A Common Stock 2021-02-01 4 C 0 239487 A 239487 I By Trust Class A Common Stock 2021-02-01 4 S 0 47517 101.4469 D 191970 I By Trust Class A Common Stock 2021-02-01 4 S 0 152203 102.0852 D 39767 I By Trust Class A Common Stock 2021-02-01 4 S 0 29052 103.1161 D 10715 I By Trust Class A Common Stock 2021-02-01 4 S 0 10315 104.019 D 400 I By Trust Class A Common Stock 2021-02-01 4 S 0 400 104.965 D 0 I By Trust Class A Common Stock 2021-02-01 4 C 0 52400 A 52400 I By GRAT Class A Common Stock 2021-02-01 4 S 0 14944 101.512 D 37456 I By GRAT Class A Common Stock 2021-02-01 4 S 0 32001 102.0792 D 5455 I By GRAT Class A Common Stock 2021-02-01 4 S 0 4155 103.12 D 1300 I By GRAT Class A Common Stock 2021-02-01 4 S 0 1300 104.0277 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 14656 101.5101 D 35344 I By Trust Class A Common Stock 2021-02-01 4 S 0 30070 102.0819 D 5274 I By Trust Class A Common Stock 2021-02-01 4 S 0 3980 103.1293 D 1294 I By Trust Class A Common Stock 2021-02-01 4 S 0 1194 103.9946 D 100 I By Trust Class A Common Stock 2021-02-01 4 S 0 100 104.97 D 0 I By Trust 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 15839 101.5274 D 34161 I By Trust Class A Common Stock 2021-02-01 4 S 0 29128 102.095 D 5033 I By Trust Class A Common Stock 2021-02-01 4 S 0 3724 103.1465 D 1309 I By Trust Class A Common Stock 2021-02-01 4 S 0 1309 104.0127 D 0 I By Trust Class A Common Stock 2021-02-02 4 C 0 77513 A 77513 I By Trust Class A Common Stock 2021-02-02 4 S 0 5891 103.3154 D 71622 I By Trust Class A Common Stock 2021-02-02 4 S 0 11788 104.0634 D 59834 I By Trust Class A Common Stock 2021-02-02 4 S 0 12138 105.2145 D 47696 I By Trust Class A Common Stock 2021-02-02 4 S 0 45896 106.1901 D 1800 I By Trust Class A Common Stock 2021-02-02 4 S 0 1800 106.8817 D 0 I By Trust Class A Common Stock 105910 D Class B Common Stock 2021-02-01 4 C 0 239487 0.00 D Class A Common Stock 239487 11012069 I By Trust Class B Common Stock 2021-02-01 4 C 0 52400 0.00 D Class A Common Stock 52400 2945413 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 2021-02-01 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 77513 0.00 D Class A Common Stock 77513 10934556 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 are held by the Alexis Le-Quoc Revocable Trust. 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 $100.72 to $101.71. 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 $101.72 to $102.71. 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 $102.72 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 $105.04. 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 Alexis Le-Quoc 2016 GRAT. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $100.76 to $101.75. 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 $101.76 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 $102.76 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 $103.83 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. Shares are held by Offbeat Polymath 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 $102.765. 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 $103.78 to $104.25. 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 Endearing Viceroy 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 $102.77 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 $103.78 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 $102.70 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 $103.70 to $104.69. 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 $104.78 to $105.77. 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 $105.79 to $106.78. 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 $106.79 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. Alexis Le-Quoc, by /s/ Ron A. Metzger, Attorney-in-Fact 2021-02-03