ALIGN TECHNOLOGY INC — Director's Dealing 2018

May 1, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ALIGN TECHNOLOGY INC (ALGN)
CIK: 0001097149
Period of Report: 2018-04-30

Reporting Person: PRESCOTT THOMAS M (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-02-27	Common Stock	G	16925	—	Disposed	222399	Direct
2018-04-30	Common Stock	S	22855	$250.3056	Disposed	199544	Direct
2018-04-30	Common Stock	S	17610	$251.7264	Disposed	181934	Direct
2018-04-30	Common Stock	S	6968	$252.2504	Disposed	174966	Direct
2018-04-30	Common Stock	S	5600	$253.7357	Disposed	169366	Direct
2018-04-30	Common Stock	S	12012	$254.5661	Disposed	157354	Direct
2018-04-30	Common Stock	S	10241	$255.2177	Disposed	147113	Direct
2018-04-30	Common Stock	S	5614	$256.3162	Disposed	141499	Direct
2018-04-30	Common Stock	S	1100	$257.3251	Disposed	140399	Direct

Footnotes

F1: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $250.00 to $251.00, 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.

F2: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $251.01 to $252.00, 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.

F3: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $252.005 to $253.00, 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.

F4: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $253.01 to $254.00, 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.

F5: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $254.01 to $255.00, 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.

F6: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $255.01 to $255.99, 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.

F7: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $256.015 to $257.00, 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.

F8: The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $257.05 to $257.96, 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.