TWILIO INC

Securities Trading Plans of Directors and Executive Officers

During the three months ended June 30, 2024, the following “Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K) was adopted which was intended to satisfy the affirmative defense in Rule 10b5-1(c):

On May 21, 2024, Dana Wagner our Chief Legal Officer, adopted a Rule 10b5-1 trading plan providing for the sale of up to an aggregate of 104,525 shares of common stock held by Mr. Wagner, plus any shares acquired pursuant to equity awards granted after the adoption of the plan or purchased under our employee stock purchase plan prior to the termination of the plan. The number of shares listed above for Mr. Wagner includes performance-based awards presented at their target amounts and shares subject to limit orders that may or may not execute. The number of shares eligible for sale will also be reduced by shares sold in mandatory transactions to cover withholding taxes. The duration of the plan is until August 15, 2025 or earlier if all transactions under the plan have been completed.

No other directors or officers adopted orterminated a “Rule 10b5-1 trading arrangement” or a “non-Rule 10b5-1 trading arrangement” (each as defined in Item 408 of Regulation S-K) during the last fiscal quarter.