DDOG · Datadog, Inc.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $226.81 to $227.80. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $227.81 to $228.80. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.83 to $231.82. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.03 to $233.70. 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.

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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $231.84 to $232.79. 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.

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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $225.79 to $226.75. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $228.81 to $229.80. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $229.82 to $230.80. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $243.25 to $244.09. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $244.70 to $245.60. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $236.37 to $237.36. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $233.36 to $234.34. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $237.38 to $238.13. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $232.36 to $233.35. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $238.38 to $239.37. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $239.43 to $240.22. 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.

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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $242.25 to $243.03. 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.

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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $240.80 to $241.63. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $235.36 to $236.35. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $234.36 to $235.34. 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.

Shares sold pursuant to a 10b5-1 plan dated December 15, 2025.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $256.66 to $256.82. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. The Reporting Person disclaims beneficial ownership of the shares held by such trusts for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $255.66 to $256.65. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. The Reporting Person disclaims beneficial ownership of the shares held by such trusts for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $241.14 to $241.44. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $245.49 to $246.44. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $251.83 to $252.78. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $252.92 to $253.34. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $250.82 to $251.8. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $248.50 to $249.165. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. The Reporting Person disclaims beneficial ownership of the shares held by such trusts for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $248.53 to $249.49. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $249.62 to $250.55. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $243.43 to $243.86. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $252.68 to $253.48. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. The Reporting Person disclaims beneficial ownership of the shares held by such trusts for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose

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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $251.66 to $252.645. Full information regarding the number of shares sold at each separate price can be furnished to the SEC staff upon request.

These shares are directly held by the Reporting Person through a trust of which he is a trustee and another estate planning trust having an independent trustee. The Reporting Person disclaims beneficial ownership of the shares held by such trusts for purposes of Section 16 of the Exchange Act, except to the extent of his pecuniary interest therein, if any. This report shall not be deemed an admission that the Reporting Person is a beneficial owner of such securities for the purpose of Section 16 of the Exchange Act, or for any other purpose

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $246.53 to $247.48. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated March 13, 2026.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $247.53 to $248.51. 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.

Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $245.69 to $246.58. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $230.96 to $231.40. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $240.18 to $241.03. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $256.72 to $257.69. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $246.86 to $247.83. 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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $238.79 to $239.68. 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.

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.

Shares sold pursuant to a 10b5-1 plan dated June 13, 2025.

Price reported is a weighted-average sales price. The shares were sold at prices ranging from $259.19 to $260.16. 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.