Fastly, Inc.

Trading Arrangements

During the Company’s last fiscal quarter, the Company’s directors and officers (as defined in Rule 16a-1(f) under the Exchange Act)adopted, terminated, or modified the contracts, instructions or written plans for the purchase or sale of the Company’s securities set forth in the table below.

(1) On August 27, 2025, Charles Compton, the Company's Chief Executive Officer, terminated his previously disclosed 10b5-1 plan, entered into on June 3, 2025. On the same date, Mr. Compton entered into a new 10b5-1 Plan, providing for the potential sale of up to 339,874 shares of the Company's Common Stock plus any shares awarded under the Company's 2025 Bonus Program as detailed in Note 10—Stockholders' Equity—Company-wide Bonus Programs (“Bonus Programs”). However, because certain of Mr. Compton's planned sale amounts are equal to a designated percentage of the net number of shares (i) resulting from RSUs vesting or (ii) from the Executive PSUs as detailed in Note 10—Stockholders' Equity—Performance stock awards for executive officers (“Executive PSUs”), of which a portion will be surrendered to the Company or sold to cover withholding taxes, depending on how many shares are withheld in these instances, and the level of achievement of certain Company-wide targets related to the Company’s operating plan for the fiscal year 2025 (as it relates to the Executive PSUs), the maximum number of shares to be sold may be less. The plan expires on August 31, 2026, or upon the earlier completion of all authorized transactions under the plan.