Datadog (DDOG)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-11 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Datadog, Inc. (DDOG) CIK: 0001561550 --- Reporting Owner --- Name: Walters Sean Michael CIK: 0001903980 Role: Officer (Chief Revenue Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -200 | Price: $225.18 Total Value: $45,036.64 Shares Owned After: 270,096 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F2] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $224.79 to $225.56. 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. [Transaction #2] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -200 | Price: $226.10 Total Value: $45,221.00 Shares Owned After: 269,896 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F3] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $226.03 to $226.18. 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. [Transaction #3] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -800 | Price: $227.53 Total Value: $182,028.00 Shares Owned After: 269,096 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F4] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.11 to $228.08. 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. [Transaction #4] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -800 | Price: $228.76 Total Value: $183,007.84 Shares Owned After: 268,296 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F5] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.13 to $229.05. 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. [Transaction #5] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -2,300 | Price: $229.76 Total Value: $528,439.26 Shares Owned After: 265,996 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F6] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.19 to $230.17. 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. [Transaction #6] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -2,287 | Price: $230.84 Total Value: $527,932.45 Shares Owned After: 263,709 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F7] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.40 to $231.37. 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. [Transaction #7] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -1,613 | Price: $232.01 Total Value: $374,238.58 Shares Owned After: 262,096 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F8] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.45 to $232.36. 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. [Transaction #8] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -2,197 | Price: $232.90 Total Value: $511,689.43 Shares Owned After: 259,899 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F9] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.46 to $233.38. 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. [Transaction #9] Security: Class A Common Stock Date: 2026-06-11 | Code: S (Open market sale) Shares: -1,479 | Price: $233.91 Total Value: $345,957.77 Shares Owned After: 258,420 | Ownership: D (Direct) Footnotes: [F1] Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. [F10] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.54 to $234.20. 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. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: I (Indirect) --- Footnotes (Complete Index) --- F1: Shares sold pursuant to a 10b5-1 plan dated December 12, 2025. F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.54 to $234.20. 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. F2: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $224.79 to $225.56. 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. F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $226.03 to $226.18. 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. F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.11 to $228.08. 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. F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.13 to $229.05. 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. F6: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.19 to $230.17. 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. F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.40 to $231.37. 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. F8: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.45 to $232.36. 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. F9: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.46 to $233.38. 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. --- Signature --- /s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-06-15)