X0306 4 2021-05-19 0 0001097149 ALIGN TECHNOLOGY INC ALGN 0001293595 Thaler Warren S C/O ALIGN TECHNOLOGY INC. 410 NO. SCOTTSDALE RD., SUITE 1300 TEMPE AZ 85281 1 0 0 0 Common Stock 2021-05-19 4 M 0 1271 0.00 A 29092 D Common Stock 66378 I By Trust Restricted Stock Unit 0.0001 2021-05-19 4 M 0 1271 0.00 D Common Stock 1271 0 D Restricted Stock Unit 0.0001 2021-05-19 4 A 0 524 0.00 A Common Stock 524 524 D These shares are held directly by the Thaler Family Trust for which the spouse of the Reporting Person is the trustee. Represents par value of ALGN common stock. 100% of the restricted stock unit granted on May 20, 2020 became vested on May 19, 2021 and shares were delivered to reporting person on such vest date. 100% of the restricted stock unit granted on May 19, 2021 will become vested on the earlier of (i) May 19, 2022 or (i) the date of the 2022 annual meeting of stockholders. Shares will be delivered to reporting person on the vest date. /s/Julie Ann Coletti Attorney-in-Fact for Warren S. Thaler 2021-05-21