UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A INFORMATION

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

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Filed by a Party other than the Registrant  ☐

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☐	Preliminary Proxy Statement
☐	Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))
☐	Definitive Proxy Statement
☒	Definitive Additional Materials
☐	Soliciting Material Pursuant to §240.14a-12
ATHENEX, INC.
(Name of Registrant as Specified In Its Charter)
(Name of Person(s) Filing Proxy Statement, if other than the Registrant)
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Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting of

Stockholders of Athenex, Inc. to be held on June 12, 2018

This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy materials, go to www.proxydocs.com/ATNX. To submit your proxy go to www.proxypush.com/ATNX (you will need the 12 digit control number in the box below).

Under new United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the Internet. We have chosen to use these procedures for our 2018 Annual Meeting and need YOUR participation.

If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for the 2018 Annual Meeting, please make this request on or before May 31, 2018.

¾	For a Convenient Way to VIEW Proxy Materials	½
	go to: www.proxydocs.com/ATNX
	– and –
	To VOTE Online go to: www.proxypush.com/ATNX

Proxy Materials Available to View or Receive:

1. Notice of Annual Meeting of Stockholders and Proxy Statement 2. 2017 Annual Report

3. Annual Report on Form 10-K

Printed materials may be requested by one of the following methods:

You must use the 12 digit control number located in the shaded gray box below.		*   If requesting materials by e-mail, please send a blank e-mail with the 12 digit control number (located below) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting materials.
	ACCOUNT NO.	SHARES

Athenex, Inc. Notice of Annual Meeting
	Date:	Tuesday, June 12, 2018
	Time:	9:30 A.M. (EDT)
	Place:	Wyndham Garden Buffalo Downtown
		125 High Street, Buffalo, New York 14203

The purpose of the annual meeting is to take action on the following proposals:

The Board of Directors recommends that you vote “FOR” the following.

1.	Election of Class I Directors
	Nominees	01	Michael Cannon
		02	Jinn Wu
		03	James Zukin
2.	Ratification of the appointment of Deloitte & Touche LLP as Athenex, Inc.’s independent registered public accounting firm for the fiscal year ending December 31, 2018.