X0609 4 2026-08-13 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 2026-08-13 4 C 0 20000 0 A 21640 I By Trust Class A Common Stock 2026-08-13 4 S 0 200 241.29 D 21440 I By Trust Class A Common Stock 2026-08-13 4 S 0 200 243.645 D 21240 I By Trust Class A Common Stock 2026-08-13 4 S 0 300 246.0408 D 20940 I By Trust Class A Common Stock 2026-08-13 4 S 0 3200 247.0696 D 17740 I By Trust Class A Common Stock 2026-08-13 4 S 0 4511 248.1199 D 13229 I By Trust Class A Common Stock 2026-08-13 4 S 0 3694 248.9092 D 9535 I By Trust Class A Common Stock 2026-08-13 4 S 0 2195 250.0211 D 7340 I By Trust Class A Common Stock 2026-08-13 4 S 0 1200 251.4506 D 6140 I By Trust Class A Common Stock 2026-08-13 4 S 0 4100 252.2872 D 2040 I By Trust Class A Common Stock 2026-08-13 4 S 0 400 253.1615 D 1640 I By Trust Class A Common Stock 6541 I By Trust Class A Common Stock 29071 D Class B Common Stock 2026-08-13 4 C 0 20000 0 D Class A Common Stock 20000 190059 I By Trust Class B Common Stock Class A Common Stock 593464 593464 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 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 $241.14 to $241.44. 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 $243.43 to $243.86. 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 $245.49 to $246.44. 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 $246.53 to $247.48. 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. Price reported is a weighted-average sales price. The shares were sold at prices ranging from $247.53 to $248.51. 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 $248.53 to $249.49. 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 $249.62 to $250.55. 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 $250.82 to $251.8. 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 $251.83 to $252.78. 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 $252.92 to $253.34. 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 directly by Agarwal 2019 Family Trust, of which the Reporting Person's spouse is Trustee. Shares are held by Reporting Person's spouse. /s/ Kerry Acocella, Attorney-in-Fact 2026-08-17