Datadog (DDOG) 4: CTO sells 53,912 shares for $14.75M (Oct 9, 2026)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-10-07 10b5-1 Pre-arranged Plan: Yes --- Issuer --- Name: Datadog, Inc. (DDOG) CIK: 0001561550 --- Reporting Owner --- Name: Le-Quoc Alexis CIK: 0001783984 Role: Director, Officer (Chief Technology Officer) --- Non-Derivative Transactions --- [Transaction #1] Security: Class A Common Stock Date: 2026-10-07 | Code: C (Conversion of derivative) Shares: +43,224 | Price: $0.00 Shares Owned After: 531,257 | 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: 2026-10-07 | Code: C (Conversion of derivative) Shares: +10,688 | Price: $0.00 Shares Owned After: 541,945 | 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 #3] Security: Class A Common Stock Date: 2026-10-07 | Code: S (Open market sale) Shares: -18,609 | Price: $271.40 Total Value: $5,050,397.00 Shares Owned After: 523,336 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F3] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $270.85 to $271.84. 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: 2026-10-07 | Code: S (Open market sale) Shares: -5,338 | Price: $272.25 Total Value: $1,453,285.45 Shares Owned After: 517,998 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F4] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $271.85 to $272.84. 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: 2026-10-07 | Code: S (Open market sale) Shares: -2,789 | Price: $273.27 Total Value: $762,137.76 Shares Owned After: 515,209 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F5] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $272.85 to $273.84. 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: 2026-10-07 | Code: S (Open market sale) Shares: -13,036 | Price: $274.51 Total Value: $3,578,522.79 Shares Owned After: 502,173 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F6] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $273.85 to $274.84. 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: 2026-10-07 | Code: S (Open market sale) Shares: -8,268 | Price: $275.26 Total Value: $2,275,810.82 Shares Owned After: 493,905 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F7] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $274.85 to $275.82. 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: 2026-10-07 | Code: S (Open market sale) Shares: -2,272 | Price: $276.23 Total Value: $627,592.52 Shares Owned After: 491,633 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F8] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $275.86 to $276.84. 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: 2026-10-07 | Code: S (Open market sale) Shares: -1,700 | Price: $277.36 Total Value: $471,515.06 Shares Owned After: 489,933 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F9] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $276.92 to $277.91. 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: 2026-10-07 | Code: S (Open market sale) Shares: -1,300 | Price: $278.88 Total Value: $362,548.94 Shares Owned After: 488,633 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F10] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $278.70 to $279.60. 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 #11] Security: Class A Common Stock Date: 2026-10-07 | Code: S (Open market sale) Shares: -600 | Price: $280.43 Total Value: $168,256.98 Shares Owned After: 488,033 | Ownership: D (Direct) Footnotes: [F2] Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. [F11] Price reported is a weighted-average sales price. The shares were sold at prices ranging from $280.05 to $280.60. 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. --- Derivative Transactions --- [Transaction #1] Security: Stock Option (Right to Buy) Date: 2026-10-07 | Code: M (Exercise of derivative) Shares: -10,688 | Price: $0.00 Exercise Price: $10.74 Exercisable: N/A | Expires: 2029-07-19 Shares Owned After: 120,562 | Ownership: D (Direct) Footnotes: [F13] Option is fully vested and exercisable. [Transaction #2] Security: Class B Common Stock Date: 2026-10-07 | Code: M (Exercise of derivative) Shares: +10,688 | Price: $10.74 Shares Owned After: 2,170,718 | 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: 2026-10-07 | Code: C (Conversion of derivative) Shares: -53,912 | Price: $0.00 Shares Owned After: 2,116,806 | 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. --- Holdings --- [Holding #1] Security: Class A Common Stock Ownership: I (Indirect) Footnotes: [F12] Shares are held by the Alexis Le-Quoc Revocable Trust. [Holding #2] Security: Class B Common Stock Ownership: I (Indirect) 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. [F12] Shares are held by the Alexis Le-Quoc Revocable Trust. --- 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. F10: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $278.70 to $279.60. 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. F11: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $280.05 to $280.60. 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. F12: Shares are held by the Alexis Le-Quoc Revocable Trust. F13: Option is fully vested and exercisable. F2: Shares sold pursuant to a 10b5-1 plan dated June 13, 2025. F3: Price reported is a weighted-average sales price. The shares were sold at prices ranging from $270.85 to $271.84. 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 $271.85 to $272.84. 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 $272.85 to $273.84. 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 $273.85 to $274.84. 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 $274.85 to $275.82. 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 $275.86 to $276.84. 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 $276.92 to $277.91. 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 (2026-10-09)