Xencor, Inc. Announces Completion of Public Offering of Common Stock and Exercise in Full of Option to Purchase Additional Shares of Common Stock

MONROVIA, Calif., Dec. 6, 2016

Leerink Partners acted as sole book-running manager in the offering. Canaccord Genuity and Wedbush PacGrow acted as co-managers in the offering.

The shares of common stock described above were offered by Xencor pursuant to a shelf registration statement filed by Xencor with the Securities and Exchange Commission ("SEC") that was declared effective on October 5, 2016. A final prospectus supplement and accompanying prospectus relating to the offering have been filed with the SEC and are available on the SEC's website located at http://www.sec.gov. Copies of the final prospectus supplement and the accompanying prospectus relating to the offering may be obtained from Leerink Partners LLC, Attention: Syndicate Department, One Federal Street, 37th Floor, Boston, MA 02110, or by email at syndicate@leerink.com or by telephone at (800) 808‐7525 x6142.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any state or other jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such state or other jurisdiction.

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SOURCE Xencor, Inc.