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Form SCHEDULE 13G/A Xencor Inc Filed by: EcoR1 Capital, LLC

May 15, 2026 2:24 PM EDT





Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
   Rule 13d-1(b)
   Rule 13d-1(c)
   Rule 13d-1(d)




schemaVersion:


SCHEDULE 13G




Comment for Type of Reporting Person:  Percentage calculated based on 71,141,596 shares of Common Stock outstanding on May 1, 2026, as reported in the Form 10-Q filed by the Issuer for the quarter ended March 31, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person:  Percentage calculated based on 71,141,596 shares of Common Stock outstanding on May 1, 2026, as reported in the Form 10-Q filed by the Issuer for the quarter ended March 31, 2026.


SCHEDULE 13G




Comment for Type of Reporting Person:  Percentage calculated based on 71,141,596 shares of Common Stock outstanding on May 1, 2026, as reported in the Form 10-Q filed by the Issuer for the quarter ended March 31, 2026.


SCHEDULE 13G



 
EcoR1 Capital, LLC
 
Signature:/s/ Oleg Nodelman
Name/Title:Manager
Date:05/14/2026
 
Oleg Nodelman
 
Signature:/s/ Oleg Nodelman
Name/Title:Reporting person
Date:05/14/2026
 
EcoR1 Capital Fund Qualified, L.P.
 
Signature:/s/ Oleg Nodelman
Name/Title:Manager of the General Partner, EcoR1 Capital, LLC
Date:05/14/2026
Exhibit Information

EXHIBIT 99.1 - AGREEMENT REGARDING JOINT FILING OF STATEMENT ON SCHEDULE 13D OR 13G

ATTACHMENTS / EXHIBITS

AGREEMENT REGARDING JOINT FILING



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