=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-11
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: 2026-09-11 | Code: S (Open market sale)
Shares: -800 | Price: $219.68
Total Value: $175,747.68
Shares Owned After: 244,045 | 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 $219.13 to $220.08. 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 #2]
Security: Class A Common Stock
Date: 2026-09-11 | Code: S (Open market sale)
Shares: -5,824 | Price: $220.67
Total Value: $1,285,194.89
Shares Owned After: 238,221 | 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 $220.18 to $221.17. 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 #3]
Security: Class A Common Stock
Date: 2026-09-11 | Code: S (Open market sale)
Shares: -4,286 | Price: $221.40
Total Value: $948,926.83
Shares Owned After: 233,935 | 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 $221.19 to $221.89. 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: 2026-09-11 | Code: S (Open market sale)
Shares: -500 | Price: $222.31
Total Value: $111,156.25
Shares Owned After: 233,435 | 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 $222.20 to $222.45. 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: 2026-09-11 | Code: S (Open market sale)
Shares: -300 | Price: $224.45
Total Value: $67,335.99
Shares Owned After: 233,135 | 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 $224.13 to $224.86. 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.
--- 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.
F2: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $219.13 to $220.08. 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.
F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $220.18 to $221.17. 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.
F4: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $221.19 to $221.89. 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 $222.20 to $222.45. 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 $224.13 to $224.86. 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.
--- Signature ---
/s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-09-15)
