SEC Form 4 · accession 0001561550-26-000318
Datadog, Inc. · DDOG
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
David M Obstler
Officer — Chief Financial Officer
Period of report
Sep 21, 2026
Accepted (ET)
Sep 23, 2026 · 4:50 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001561550
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Class A Common Stock | Sep 21, 2026 | S | 10,000 | $241.25 | D | 368,067 | D | |
| Class A Common StockF3 | Sep 21, 2026 | C | 3,000 | $0.00 | A | 3,000 | I | By Trust |
| Class A Common StockF3 | Sep 21, 2026 | S | 3,000 | $241.25 | D | 0 | I | By Trust |
| Class A Common StockF4 | Sep 21, 2026 | C | 3,000 | $0.00 | A | 3,000 | I | By Trust |
| Class A Common StockF4 | Sep 21, 2026 | S | 3,000 | $241.25 | D | 0 | I | By Trust |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Class B Common StockF3,F2 | — | Sep 21, 2026 | C | 3,000 | D | — | — | Class A Common Stock | 3,000 | 31,198 | I |
| Class B Common StockF4,F2 | — | Sep 21, 2026 | C | 3,000 | D | — | — | Class A Common Stock | 3,000 | 31,199 | I |
| Class B Common StockF2 | — | holding | — | — | — | — | — | Class A Common Stock | 8,103 | 8,103 | D |
Explanation of responses
- F1Shares sold pursuant to a 10b5-1 plan dated June 13, 2026.
- F2Each share of Class B Common Stock is convertible at any time at the option of the Reporting Person into one share of Class A Common Stock and has no expiration date. Each share of Class B Common Stock will convert automatically into one share of Class A Common Stock upon the earliest of: (i) any transfer, whether or not for value, except for certain "Permitted Transfers" as defined in the Issuer's amended and restated certificate of incorporation, (ii) the death of the Reporting Person in the case of shares held directly or in a trustee capacity, and (iii) the tenth anniversary of the Issuer's initial public offering of its Class A Common Stock.
- F3Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's other child, of which the Reporting Person's spouse is Trustee. See Footnote 4.
- F4Shares are held directly by Obstler Children 2019 Trust FBO the Reporting Person's child, of which the Reporting Person's spouse is Trustee. Obstler Children 2019 Trust FBO the Reporting Person's child and Obstler Children 2019 Trust FBO the Reporting Person's other child are separate trusts for the benefit of the Reporting Person's children with substantially identical terms.