144 0001783984 XXXXXXXX LIVE 0001561550 DATADOG, INC 001-39051 620 8th Avenue, 45th Floor New York NY 10018 8663294466 ALEXIS T LEQUOC Director Officer Class A Common Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004 43224 10696859.40 334904614 09/23/2026 NASDAQ Common 12/06/2023 Previously Exercised Options Issuer N 43224 12/06/2023 Cash N ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Common 09/02/2026 21772 4635352.42 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 09/01/2026 43224 9812454.22 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 09/01/2026 10688 2426472.06 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 08/24/2026 43224 9882290.15 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 08/10/2026 43224 10951249.93 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 08/10/2026 10688 2707915.96 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 07/20/2026 43224 11464111.33 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 07/08/2026 43224 11118989.31 10b5-1 Sales for ALEXIS T LEQUOC 620 8th Avenue, 45th Floor New York NY 10018 Class A Common 07/08/2026 10688 2749392.88 The securities to be sold were acquired upon the previous exercise of stock options during the period of 12/06/2023 through 10/14/2024. Securities to be sold, acquired through RSU/PSU or upon option exercise, were registered on Form S-8. 09/23/2026 06/13/2025 Alexis T. Le-Quoc