Datadog, Inc. (DDOG) Insider Transactions

Reported filing row; may be amended. Do not sum filings blindly.

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 13, 2025.

F3 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $203.92 to $204.78. 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.

F4 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $205.00 to $205.95. 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 $206.09 to $207.07. 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 $207.10 to $208.09. 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.

F7 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $208.10 to $209.09. 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.

F8 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $209.10 to $210.08. 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 $210.12 to $210.81. 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.

F10 Shares are held by the Alexis Le-Quoc Revocable Trust.

References: F2, F3

Reported filing row; may be amended. Do not sum filings blindly.

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 13, 2025.

F3 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $203.92 to $204.78. 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.

F4 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $205.00 to $205.95. 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 $206.09 to $207.07. 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 $207.10 to $208.09. 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.

F7 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $208.10 to $209.09. 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.

F8 Price reported is a weighted-average sales price. The shares were sold at prices ranging from $209.10 to $210.08. 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 $210.12 to $210.81. 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.

F10 Shares are held by the Alexis Le-Quoc Revocable Trust.

References: F1

Reported filing row; may be amended. Do not sum filings blindly.

F1 Shares donated to a donor-advised fund, which will use the gifted shares for charitable purposes.

F2 The Shares are held by The Callahan-Thernstrom Family Trust, of which Reporting Person is Trustee.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

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 are held by Reporting Person's spouse.

F3 Shares are held directly by Agarwal 2019 Family Trust, of which the Reporting Person's spouse is Trustee.

F4 Shares are held directly by Agarwal 2018 Family Trust, of which the Reporting Person's spouse is Trustee.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

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.

References: F1, F2

Reported filing row; may be amended. Do not sum filings blindly.

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.

References: F1, F2

Amendment: compare with original; not an additional trade.

F1 This amendment to Form 4 is being filed solely to correct the reporting of the conversion of 84,698 Class B shares, which did not occur.

F2 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.

F3 Reflects balance as of the transaction date. The numbers of shares reported as beneficially owned following each other transaction reported in the Original Form 4 are deemed amended and updated hereby. This Form 4 is also deemed to amend and update the number of shares reported as beneficially owned on each Form 4 filed subsequent to May 13, 2026.

References: F2, F1, F3

Amendment: compare with original; not an additional trade.

F1 This amendment to Form 4 is being filed solely to correct the reporting of the conversion of 84,698 Class B shares, which did not occur.

F2 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.

F3 Reflects balance as of the transaction date. The numbers of shares reported as beneficially owned following each other transaction reported in the Original Form 4 are deemed amended and updated hereby. This Form 4 is also deemed to amend and update the number of shares reported as beneficially owned on each Form 4 filed subsequent to May 13, 2026.

References: F1, F2, F3