=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2026-09-14
10b5-1 Pre-arranged Plan: Yes
--- Issuer ---
Name: Datadog, Inc. (DDOG)
CIK: 0001561550
--- Reporting Owner ---
Name: Acocella Kerry
CIK: 0001903975
Role: Officer (General Counsel and Secretary)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -200 | Price: $221.63
Total Value: $44,325.70
Shares Owned After: 120,323 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F2] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $221.27 to $221.98. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -300 | Price: $222.80
Total Value: $66,840.99
Shares Owned After: 120,023 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F3] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $222.38 to $223.22. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -400 | Price: $224.32
Total Value: $89,727.00
Shares Owned After: 119,623 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F4] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $223.92 to $224.45. 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 #4]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -409 | Price: $225.34
Total Value: $92,162.18
Shares Owned After: 119,214 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F5] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.02 to $225.96. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -191 | Price: $226.32
Total Value: $43,227.94
Shares Owned After: 119,023 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F6] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $226.21 to $226.45. 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 #6]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -600 | Price: $228.89
Total Value: $137,336.04
Shares Owned After: 118,423 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F7] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.31 to $229.3. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -1,156 | Price: $229.84
Total Value: $265,700.01
Shares Owned After: 117,267 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F8] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.5 to $230.12. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -1,024 | Price: $230.87
Total Value: $236,413.13
Shares Owned After: 116,243 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F9] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.55 to $231.42. 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: 2026-09-14 | Code: S (Open market sale)
Shares: -900 | Price: $232.51
Total Value: $209,257.83
Shares Owned After: 115,343 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
[F10] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.07 to $233.06. 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 #10]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -100 | Price: $233.37
Total Value: $23,337.00
Shares Owned After: 115,243 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
--- Footnotes (Complete Index) ---
F1: Shares sold pursuant to a 10b5-1 plan dated December 11, 2025.
F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.07 to $233.06. 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 $221.27 to $221.98. 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 $222.38 to $223.22. 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 $223.92 to $224.45. 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.
F5: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.02 to $225.96. 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 $226.21 to $226.45. 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.
F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.31 to $229.3. 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 $229.5 to $230.12. 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 $230.55 to $231.42. 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 (2026-09-16)
