X0508 4 2023-12-06 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 Chief Technology Officer 1 Class A Common Stock 2023-12-06 4 C 0 85637 0.3067 A 332965 D Class A Common Stock 2023-12-06 4 C 0 30780 0.9092 A 363745 D Class A Common Stock 2023-12-06 4 C 0 10688 10.74 A 374433 D Class A Common Stock 2023-12-06 4 S 0 56571 114.5339 D 317862 D Class A Common Stock 2023-12-06 4 S 0 26310 115.673 D 291552 D Class A Common Stock 2023-12-06 4 S 0 27363 116.7947 D 264189 D Class A Common Stock 2023-12-06 4 S 0 14676 117.6383 D 249513 D Class A Common Stock 2023-12-06 4 S 0 2185 118.4707 D 247328 D Stock Option (Right to Buy) 0.3067 2023-12-06 4 M 0 150240 0.00 D 2025-10-27 Class B Common Stock 150240 2854560 D Class B Common Stock 2023-12-06 4 M 0 150240 0.00 A Class A Common Stock 150240 796272 D Class B Common Stock 2023-12-06 4 C 0 85637 0.00 D Class A Common Stock 85637 710635 D Stock Option (Right to Buy) 0.9092 2023-12-06 4 M 0 54000 0.00 D 2027-10-25 Class B Common Stock 54000 1242000 D Class B Common Stock 2023-12-06 4 M 0 54000 0.00 A Class A Common Stock 54000 764635 D Class B Common Stock 2023-12-06 4 C 0 30780 0.00 D Class A Common Stock 30780 733855 D Stock Option (Right to Buy) 10.74 2023-12-06 4 M 0 18750 0.00 D 2029-07-19 Class B Common Stock 18750 881250 D Class B Common Stock 2023-12-06 4 M 0 18750 0.00 A Class A Common Stock 18750 752605 D Class B Common Stock 2023-12-06 4 C 0 10688 0.00 D Class A Common Stock 10688 741917 D Class B Common Stock Class A Common Stock 7646635 7646635 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 trading plan adopted on September 5, 2023. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $114.26 to $115.25. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $115.26 to $116.25. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $116.26 to $117.25. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $117.26 to $118.25. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $118.26 to $118.78. 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. Option is fully vested and exercisable. Shares are held by the Alexis Le-Quoc Revocable Trust. Alexis Le-Quoc, by /s/ Ron A. Metzger, Attorney-in-Fact 2023-12-08