X0306 4 2018-05-24 0 0001097149 ALIGN TECHNOLOGY INC ALGN 0001675043 Hockridge Stuart A C/O ALIGN TECHNOLOGY, INC. 2560 ORCHARD PARKWAY SAN JOSE CA 95131 0 1 0 0 SVP Global HR Common Stock 2018-05-24 4 S 0 4342 315.1192 D 514 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $135.1067 to $315.22, 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. Roger E. George Atty-in-Fact for Stuart Hockridge 2018-05-29