TWILIO INC

Securities Trading Plans of Directors and Executive Officers

During the three months ended March 31, 2024, the following “Rule 10b5-1 trading arrangements” (as defined in Item 408 of Regulation S-K) were adopted orterminated by our directors and officers, each of which was intended to satisfy the affirmative defense in Rule 10b5-1(c):

On March 6, 2024, Khozema Shipchandler, our Chief Executive Officer and a member of our board of directors, adopted a Rule 10b5-1 trading plan providing for the sale of up to an aggregate of 123,388 shares of common stock held by Mr. Shipchandler, 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. Shipchandler 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 April 4, 2025 or earlier if all transactions under the plan have been completed.

On March 7, 2024, Aidan Viggiano, our Chief Financial Officer, entered into a Rule 10b5-1 trading plan providing for the sale of up to an aggregate of 121,675 shares of common stock held by Ms. Viggiano, 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 Ms. Viggiano 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 July 31, 2025 or earlier if all transactions under the plan have been completed.

No other directors or officers adopted or terminated 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.