Form 144 Filer Information UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 144

NOTICE OF PROPOSED SALE OF SECURITIES
PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933

Form 144

144: Issuer Information

Name of Issuer
Xencor Inc
SEC File Number
001-36182
Address of Issuer
111 WEST LEMON AVE
MONROVIA
CALIFORNIA
91016
Phone
626-305-5900
Name of Person for Whose Account the Securities are To Be Sold
Eckert Celia
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer
  1. Officer

144: Securities Information


Record Title of the Class of Securities To Be Sold Name and Address of the Broker Number of Shares or Other Units To Be Sold Aggregate Market Value Number of Shares or Other Units Outstanding Approximate Date of Sale Name the Securities Exchange
#1 Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RHODE ISLAND
02917
711 $21,244.18 60,030,076 03/09/2023
NASDAQ

144: Securities To Be Sold

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

Record Title of the Class Date you Acquired Nature of Acquisition Transaction Name of Person from Whom Acquired Is this a Gift? Date Donor Acquired Amount of Securities Acquired Date of Payment Nature of Payment *
#1 Common 03/08/2023 Restricted Stock Vesting Issuer 711 03/08/2023 Compensation


* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

144: Securities Sold During The Past 3 Months

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

Record Name and Address of Seller Title of Securities Sold Date of Sale Amount of Securities Sold Gross Proceeds
#1 Celia Eckert
111 West Lemon Avenue
Monrovia
CALIFORNIA
91016
Common 03/03/2023 427 $13,466.77
#2 Celia Eckert
111 West Lemon Avenue
Monrovia
CALIFORNIA
91016
Common 03/06/2023 2,462 $77,345.95

144: Remarks and Signature

Remarks
Date of Notice
03/09/2023

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature
/s/ Jennifer Ruchti, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Celia Eckert

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

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