Rapid7 Inc

Certain of our executive officers and directors may execute purchases and sales of our securities through Rule 10b5-1 equity trading plans and “non-Rule 10b5-1 equity trading arrangements” (as defined in Item 408(c) of Regulation S-K).

During the three months ended December 31, 2023, several of our executive officers, as set forth below, adopted or terminated a contract, instruction or written plan for the purchase or sale of Rapid7 securities that was intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

(1) The selling start date under Mr. Burton's 10b5-1 Plan adopted on December 13, 2023 is contingent on the completion or expiration of his previously adopted plan.

(2) Mr. Thomas' plan includes the sale of 30,842 shares that were gifted to the Ancore Foundation, Inc., a charitable foundation of which Mr. Thomas is a director.

• Contract, instruction or written plan intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act.

** Represents the maximum number of shares that may be sold pursuant to the Rule 10b5-1 trading arrangement in amounts and prices determined in accordance with a formula set forth in the plan. The actual number of shares sold will be dependent on the satisfaction of certain conditions as set forth in the written plan.

*** The Rule 10b5-1 trading arrangement will terminate on the earlier of the date all the shares under the plan are sold and the

expiration date indicated, subject to early termination for specified events set forth in the plan.

During the year ended December 31, 2023, other than noted above, none of our executive officers or directors terminated or modified a 10b5-1 equity trading plan, oradopted, terminated, or modified any “non-Rule 10b5-1 equity trading

arrangement”.