Item 1(a).
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Name of Issuer:
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Athenex, Inc. (the Issuer)
Item 1(b).
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Address of Issuers Principal Executive Offices:
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1001 Main Street, Suite 600, Buffalo, NY 14203
Item 2(a).
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Names of Persons Filing:
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The names of the persons filing this report (collectively, the Reporting Persons) are:
Perceptive Advisors LLC (Perceptive Advisors)
Joseph Edelman (Mr. Edelman)
Perceptive Life Sciences Master Fund, Ltd. (the Master Fund)
Item 2(b).
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Address of Principal Business Office or, if None, Residence:
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The address of the principal business office of each of the Reporting Persons is:
51 Astor Place, 10th Floor
New
York, NY 10003
Perceptive Advisors is a Delaware limited liability company
Mr. Edelman is a United States citizen
The Master Fund is a Cayman Islands corporation
Item 2(d).
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Title of Class of Securities:
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Common stock, $0.001 par value per share (Common Stock)
04685N103
Item 3.
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If this statement is filed pursuant to §§
240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
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Not applicable.
The information required by this item with respect to each Reporting Person is set forth in Rows 5 through 9 and 11 of the cover page to this
Schedule 13G. The ownership percentages reported are based 81,451,635 outstanding shares of Common Stock, based on 77,505,885 shares of Common Stock outstanding as reported in the Issuers Form 10-Q filed
on November 12, 2019 plus the issuance of 3,945,750 shares of Common Stock as reported in the Issuers Form 8-K filed on December 5, 2019.