ALIGN TECHNOLOGY INC — Director's Dealing 2018

May 18, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ALIGN TECHNOLOGY INC (ALGN)
CIK: 0001097149
Period of Report: 2018-05-16

Reporting Person: SIEGEL SUSAN E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-05-16	Common Stock	M	3115	—	Acquired	3929	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-05-16	Restricted Stock Unit	$0.0001	M	3115	Disposed		Common Stock (3115)	Direct
2018-05-16	Restricted Stock Unit	$0.0001	A	1042	Acquired		Common Stock (1042)	Direct

Footnotes

F1: Represents par value of ALGN common stock.

F2: 100% of the restricted stock unit granted on May 17, 2017 became vested on May 16, 2018 and shares were delivered to reporting person on that date.

F3: 100% of the restricted stock unit granted on May 16, 2018 will become vested on the earlier of (i) May 16, 2019 or (ii) the date of the 2019 annual meeting of stockholders. Shares will be delivered to reporting person on the vest date.