X0609 4 2026-06-12 0 0001561550 Datadog, Inc. DDOG 0001540517 Agarwal Amit false C/O DATADOG, INC. 620 8TH AVENUE, 45TH FLOOR NEW YORK NY 10018 1 0 0 0 1 Class A Common Stock 2026-06-12 4 C 0 10000 A 16541 I By Trust Class A Common Stock 2026-06-12 4 G 0 10000 0 D 6541 I By Trust Class A Common Stock 2026-06-12 4 C 0 20000 A 21640 I By Trust Class A Common Stock 2026-06-12 4 S 0 1506 228.2252 D 20134 I By Trust Class A Common Stock 2026-06-12 4 S 0 1470 229.1893 D 18664 I By Trust Class A Common Stock 2026-06-12 4 S 0 3998 230.0566 D 14666 I By Trust Class A Common Stock 2026-06-12 4 S 0 3150 231.1413 D 11516 I By Trust Class A Common Stock 2026-06-12 4 S 0 4600 232.2192 D 6916 I By Trust Class A Common Stock 2026-06-12 4 S 0 2710 233.1996 D 4206 I By Trust Class A Common Stock 2026-06-12 4 S 0 1341 234.0773 D 2865 I By Trust Class A Common Stock 2026-06-12 4 S 0 625 235.1907 D 2240 I By Trust Class A Common Stock 2026-06-12 4 S 0 600 236.075 D 1640 I By Trust Class A Common Stock 2026-06-15 4 A 0 1072 0 A 29071 D Class B Common Stock 2026-06-12 4 C 0 10000 0 D Class A Common Stock 10000 593464 I By Trust Class B Common Stock 2026-06-12 4 C 0 20000 0 D Class A Common Stock 20000 370059 I By Trust Class B Common Stock Class A Common Stock 42976 42976 I By Spouse Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock 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 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 directly by Agarwal 2019 Family Trust, of which the Reporting Person's spouse is Trustee. Shares donated to a donor-advised fund, which will use the gifted shares for charitable purposes. Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee. Shares sold pursuant to a 10b5-1 plan dated March 13, 2026. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.63 to $228.58. 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 $228.67 to $229.66. 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 $229.67 to $230.66. 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 $230.70 to $231.64. 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 $231.70 to $232.69. 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 $232.72 to $233.68. 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 $233.72 to $234.71. 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 $234.72 to $235.65. 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 $235.82 to $236.37. 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. Represents the number of shares underlying Restricted Stock Units ("RSUs") granted pursuant to the Issuer's non-employee director compensation policy. Each RSU represents a contingent right to receive one share of Issuer's Class A common stock. The RSUs vest on the earlier of (A) the Company's next annual meeting of stockholders and (B) June 15, 2027, in each case, subject to the Reporting Person's continuous service to the Issuer through the vesting date. Shares are held by Reporting Person's spouse. /s/ Kerry Acocella, Attorney-in-Fact 2026-06-16