Datadog (DDOG)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-09-03 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Datadog, Inc. (DDOG) CIK: 0001561550 --- Reporting Owner --- Name: Richardson Julie CIK: 0001466857 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-09-03 | Code: C (Conversion of derivative) Shares: +5,625 | Price: $0.00 Shares Owned After: 8,803 | Ownership: D (Direct) Footnotes: [F1] Each 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. [Transaction #2] Security: Class A Common Stock Date: 2026-09-03 | Code: S (Open market sale) Shares: -5,625 | Price: $220.00 Total Value: $1,237,500.00 Shares Owned After: 3,178 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 4, 2026. --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-09-03 | Code: M (Exercise of derivative) Shares: -5,625 | Price: $0.00 Exercise Price: $7.96 Exercisable: N/A | Expires: 2029-06-12 Shares Owned After: 22,503 | Ownership: D (Direct) Footnotes: [F3] The option is fully vested and exercisable. [Transaction #2] Security: Class B Common Stock Date: 2026-09-03 | Code: M (Exercise of derivative) Shares: +5,625 | Price: $7.96 Shares Owned After: 5,625 | Ownership: D (Direct) Footnotes: [F1] Each 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. [F1] Each 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. [F1] Each 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. [Transaction #3] Security: Class B Common Stock Date: 2026-09-03 | Code: C (Conversion of derivative) Shares: -5,625 | Price: $0.00 Shares Owned After: 0 | Ownership: D (Direct) Footnotes: [F1] Each 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. [F1] Each 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. [F1] Each 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. --- Footnotes (Complete Index) --- F1: Each 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. F2: Shares sold pursuant to a 10b5-1 plan dated June 4, 2026. F3: The option is fully vested and exercisable. --- Signature --- /s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-09-08)