FORM 4
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940
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(Print or Type Responses)
1. Name and Address of Reporting Person *
PERRY MATTHEW D
   2. Issuer Name and Ticker or Trading Symbol
XOMA Corp [XOMA] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
__X__ Director _____ 10% Owner
_____ Officer (give title below) __X__ Other (specify below)
See Explanation of Responses
(Last)
(First)
(Middle)
44 MONTGOMERY STREET, 40TH FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
05/19/2021
(Street)

SAN FRANCISCO, CA 94104		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ Form filed by More than One Reporting Person
(City)
(State)
(Zip)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security
(Instr. 3)		 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code
(Instr. 8)		 4. Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4 and 5)		 5. Amount of Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 3 and 4)		 6. Ownership Form: Direct (D) or Indirect (I)
(Instr. 4)		 7. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V Amount (A) or (D) Price
Common Stock, $0.0075 par value per share               11,799 D (1)  
8.625% Series A Cumulative Perpetual Preferred Stock (7)               200,000 D (1)  

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
(Instr. 3)		 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code
(Instr. 8)		 5. Number of Derivative Securities Acquired (A) or Disposed of (D)
(Instr. 3, 4, and 5)		 6. Date Exercisable and Expiration Date
(Month/Day/Year)		 7. Title and Amount of Underlying Securities
(Instr. 3 and 4)		 8. Price of Derivative Security
(Instr. 5)		 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s)
(Instr. 4)		 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I)
(Instr. 4)		 11. Nature of Indirect Beneficial Ownership
(Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Non-Qualified Stock Option (right to buy) $ 31.04 05/19/2021   A   5,101     (2) 05/19/2031 Common Stock 5,101 (2) 5,101 D (1)  
Non-Qualified Stock Option (right to buy) $ 21.27               (3) 05/20/2030 Common Stock 6,152   6,152 D (1)  
Non-Qualified Stock Option (right to buy) $ 15.59               (4) 05/16/2029 Common Stock 8,167   8,167 D (1)  
Non-Qualified Stock Option (right to buy) $ 25.16               (5) 05/17/2028 Common Stock 5,052   5,052 D (1)  
Non-Qualified Stock Option (right to buy) $ 4.67               (6) 03/02/2027 Common Stock 15,222   15,222 D (1)  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
PERRY MATTHEW D
44 MONTGOMERY STREET
40TH FLOOR
SAN FRANCISCO, CA 94104		   X     See Explanation of Responses

Signatures

 /s/ Matthew D. Perry   05/21/2021
**Signature of Reporting Person Date

Explanation of Responses:

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1) The Reporting Person may be deemed to be a member of a Section 13(d) group that may be deemed to collectively beneficially own more than 10% of the Issuer's outstanding shares of Common Stock.
(2) The shares subject to this option shall vest and become exercisable in equal monthly installments over the 12-month period following the date of grant (May 19, 2021), provided that the final installment will occur on the earlier of (i) the date of the next annual meeting of the Company's stockholders or (ii) the first anniversary of the date of grant of such option.
(3) All of the shares subject to this option vested and became exercisable in twelve equal monthly installments. As of May 20, 2021, these options are fully exercisable.
(4) All of the shares subject to this option vested and became exercisable in twelve equal monthly installments. As of May 16, 2020, these options are fully exercisable.
(5) These options were acquired pursuant to a grant of stock options under the Amended and Restated XOMA Corporation 2010 Long Term Incentive and Stock Award Plan (the "Plan") and were scheduled to vest and become exercisable on the one-year anniversary of the grant date of May 17, 2018. As of May 17, 2019, these options are fully exercisable.
(6) These options were acquired pursuant to the Plan, and were exercisable in twelve equal monthly installments, beginning one month from the vesting commencement date, which was February 15, 2017. As of February 15, 2018, these options are fully exercisable.
(7) Mr. Perry purchased 200,000 shares of the Issuer's 8.625% Series A Cumulative Perpetual Preferred Stock, par value $0.05 per share and liquidation preference of $25.00 per share (the "Series A Preferred Stock"), in the Issuer's public offering at the public offering price of $25.00 per share. The terms of the Series A Preferred Stock are set forth in the Certificate of Designation of the 8.625% Series A Cumulative Perpetual Preferred Stock of the Issuer (the "Certificate of Designation"). Investors in the Series A Preferred Stock generally will have no voting rights, but will have limited voting rights if the Issuer fails to pay dividends for six or more quarters (whether or not declared or consecutive) and in certain other events.

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