Datadog, Inc. (DDOG) · Insider Trading (Form 4) SEC Filing

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-06-29 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Datadog, Inc. (DDOG) CIK: 0001561550 --- Reporting Owner --- Name: Callahan Michael James CIK: 0001784030 Role: Director --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-06-29 | Code: C (Conversion of derivative) Shares: +12,500 Shares Owned After: 27,496 | Ownership: I (Indirect) | Nature: By Trust 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. [F2] The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee. [Transaction #2] Security: Class A Common Stock Date: 2026-06-29 | Code: S (Open market sale) Shares: -12,500 | Price: $247.47 Total Value: $3,093,375.00 Shares Owned After: 14,996 | Ownership: I (Indirect) | Nature: By Trust Footnotes: [F3] Shares sold pursuant to a 10b5-1 plan dated March 13, 2026. [F2] The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee. --- Derivative Transactions --- [Transaction #1] Security: Class B Common Stock Date: 2026-06-29 | Code: C (Conversion of derivative) Shares: -12,500 | Price: $0.00 Shares Owned After: 110,542 | Ownership: I (Indirect) | Nature: By Trust 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. [F2] The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: D (Direct) --- 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: The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee. F3: Shares sold pursuant to a 10b5-1 plan dated March 13, 2026. --- Signature --- /s/ /s/ Kerry Acocella, Attorney-in-Fact (2026-07-01)