=== 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: OBSTLER DAVID M
CIK: 0001120741
Role: Officer (Chief Financial Officer)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -2,656 | Price: $221.24
Total Value: $587,605.74
Shares Owned After: 415,411 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F2] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $220.67 to $221.57. 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: -5,424 | Price: $222.17
Total Value: $1,205,025.13
Shares Owned After: 409,987 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F3] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $221.68 to $222.65. 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: -2,452 | Price: $223.12
Total Value: $547,081.66
Shares Owned After: 407,535 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F4] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $222.70 to $223.60. 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: -1,801 | Price: $224.34
Total Value: $404,042.82
Shares Owned After: 405,734 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F5] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $223.82 to $224.81. 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: -3,940 | Price: $225.13
Total Value: $887,022.84
Shares Owned After: 401,794 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F6] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $224.82 to $225.78. 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.
[Transaction #6]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -629 | Price: $226.19
Total Value: $142,274.45
Shares Owned After: 401,165 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F7] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.96 to $226.54. 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: -562 | Price: $227.72
Total Value: $127,976.39
Shares Owned After: 400,603 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F8] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.095 to $228.07. 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: -1,189 | Price: $228.58
Total Value: $271,784.71
Shares Owned After: 399,414 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F9] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.13 to $229.12. 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 #9]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -9,623 | Price: $229.92
Total Value: $2,212,525.93
Shares Owned After: 389,791 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F10] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.13 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 #10]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -5,625 | Price: $230.51
Total Value: $1,296,605.25
Shares Owned After: 384,166 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F11] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.13 to $231.11. 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 #11]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -2,414 | Price: $231.53
Total Value: $558,915.83
Shares Owned After: 381,752 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F12] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.13 to $232.12. 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 #12]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -3,057 | Price: $232.71
Total Value: $711,385.60
Shares Owned After: 378,695 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F13] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.13 to $233.12. 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 #13]
Security: Class A Common Stock
Date: 2026-09-14 | Code: S (Open market sale)
Shares: -628 | Price: $233.30
Total Value: $146,512.40
Shares Owned After: 378,067 | Ownership: D (Direct)
Footnotes:
[F1] Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
[F14] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.13 to $233.49. 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.
--- Footnotes (Complete Index) ---
F1: Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.13 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.
F11: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.13 to $231.11. 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.
F12: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.13 to $232.12. 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.
F13: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.13 to $233.12. 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.
F14: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.13 to $233.49. 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.
F2: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $220.67 to $221.57. 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 $221.68 to $222.65. 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 $222.70 to $223.60. 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 $223.82 to $224.81. 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 $224.82 to $225.78. 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.
F7: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.96 to $226.54. 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 $227.095 to $228.07. 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 $228.13 to $229.12. 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.
--- Signature ---
/s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-09-16)
