POWER OF ATTORNEY

Know all by these presents, that the undersigned hereby constitutes and
appoints each of Bassil I. Dahiyat and Celia Eckert of Xencor, Inc. (the
?Company?), signing individually, the undersigned?s true and lawful
attorney-in-fact and agent to:

(1) execute for and on behalf of the undersigned, an officer, director
or holder of 10% of more of a registered class of securities of the
Company, Forms 3, 4 and 5 in accordance with Section 16(a) of the Securities
Exchange Act of 1934, as amended (the ?Exchange Act?) and the rules
thereunder;

(2) do and perform any and all acts for and on behalf of the
undersigned that may be necessary or desirable to complete and execute such
Form 3, 4 or 5, complete and execute any amendment or amendments thereto, and
timely file such forms or amendments with the United States Securities and
Exchange Commission and any stock exchange or similar authority; and

(3) take any other action of any nature whatsoever in connection with the
foregoing which, in the opinion of such attorney-in-fact, may be of benefit,
in the best interest of, or legally required by, the undersigned, it being
understood that the documents executed by such attorney-in-fact on behalf of
the undersigned pursuant to this Power of Attorney shall be in such form and
shall contain such terms and conditions as such attorney-in-fact may approve
in such attorney-in-fact?s discretion.

The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might
or could do if personally present, with full power of substitution or
revocation, hereby ratifying and confirming all that such attorney-in-fact, or
such attorney-in-fact?s substitute or substitutes, shall lawfully do or cause
to be done by virtue of this power of attorney and the rights and powers
herein granted. The undersigned acknowledges that each of the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, is not assuming, nor is the Company assuming, any of the
undersigned?s responsibilities to comply with Section 16 of the Exchange Act.

This Power of Attorney shall remain in full force and effect until the earliest
to occur of (a) the undersigned is no longer required to file Forms 3, 4 and 5
with respect to the undersigned?s holdings of and transactions in securities
issued by the Company, (b) revocation by the undersigned in a signed writing
delivered to the foregoing attorney-in-fact or (c) until such attorney-in-fact
shall no longer be employed by the Company.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 9th day of April, 2024.

/s/ Bart Cornelissen
Bart Cornelissen