TWILIO INC

Securities Trading Plans of Directors and Executive Officers

During the three months ended June 30, 2025, the following “Rule 10b5-1 trading arrangements” (as defined in Item 408 of Regulation S-K) were adopted or terminated by our directors and officers, each of which was intended to satisfy the affirmative defense in Rule 10b5-1(c):

On June 6, 2025, Aidan Viggiano, our Chief Financial Officer, adopted a Rule 10b5-1 trading plan providing for the sale of (i) shares of our common stock issuable upon the vesting and settlement of up to 68,226 RSUs outstanding prior to the adoption of the plan and (ii) certain shares of our common stock that Ms. Viggiano will acquire upon the vesting and settlement of any RSUs that may be granted after the adoption of the plan, and in each case, net of shares sold in mandatory transactions to cover withholding taxes. The shares listed above for Ms. Viggiano include shares subject to limit orders that may or may not execute. The duration of the plan is until July 31, 2026 or earlier if all transactions under the plan have been completed.