X0306 4 2021-02-11 0 0001097149 ALIGN TECHNOLOGY INC ALGN 0001234773 PRESCOTT THOMAS M C/O ALIGN TECHNOLOGY INC. 2820 ORCHARD PARKWAY SAN JOSE CA 95131 1 0 0 0 Common Stock 2021-02-11 4 S 0 600 601.5917 D 59758 I By Trust Common Stock 2021-02-11 4 S 0 2400 603.954 D 57358 I By Trust Common Stock 2021-02-12 4 S 0 2000 605.2727 D 55358 I By Trust Common Stock 2021-02-16 4 S 0 2500 612.0059 D 52858 I By Trust The price reported in column 4 is an average price. These shares were sold in multiple transactions at prices ranging from $601.50 to $601.70, inclusive. The reporting person undertakes to provide Align Technology, Inc., any security holder of Align Technology, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. Since the Reporting Person's last filing shares have been transferred to The Prescott Family Trust, Sierra South LLC TTEE. The Reporting Person and his spouse are the managers of the Trustee and exercise voting and investment control over the shares. The price reported in column 4 is an average price. These shares were sold in multiple transactions at prices ranging from $603.38 to $604.33, inclusive. The reporting person undertakes to provide Align Technology, Inc., any security holder of Align Technology, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in column 4 is an average price. These shares were sold in multiple transactions at prices ranging from $605.00 to $605.70, inclusive. The reporting person undertakes to provide Align Technology, Inc., any security holder of Align Technology, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The price reported in column 4 is an average price. These shares were sold in multiple transactions at prices ranging from $612.00 to $612.14, inclusive. The reporting person undertakes to provide Align Technology, Inc., any security holder of Align Technology, Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. /s/ Julie Ann Coletti Attorney-in-Fact for Thomas M Prescott 2021-02-16