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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person * RUBIN PAUL D   2. Issuer Name and Ticker or Trading Symbol XOMA Corp [XOMA] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) Sr. VP Clinical Dev. & CMO (Last) (First) (Middle) C/O XOMA CORPORATION, 2910 SEVENTH STREET 3. Date of Earliest Transaction (Month/Day/Year) 03/18/2015 (Street) BERKELEY, CA 94710 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 Shares 03/18/2015(1)   M   18,205 A $ 0 (2) 160,603 D   Common Shares 03/18/2015(3)   M   12,141 A $ 0 (2) 172,744 D   Common Shares 03/18/2015(4)   D   8,838 D $ 4.0105 (5) 163,906 D   Common Shares 03/18/2015(4)   D   7,017 D $ 4.0105 (5) 156,889 D   Common Shares 03/18/2015(4)   D   4,680 D $ 4.0105 (5) 152,209 D   Common Shares               6,881 I by 401(k)

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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

Restricted Stock Units

$ 0 (2)

03/18/2015

M

12,141

03/18/2014(3)

03/18/2016(3)

Common Shares

12,141

$ 0

12,141

D

Restricted Stock Units

$ 0 (2)

03/18/2015

M

18,205

03/18/2014(1)

(1)

Common Shares

18,205

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
RUBIN PAUL D C/O XOMA CORPORATION 2910 SEVENTH STREET BERKELEY, CA 94710			Sr. VP Clinical Dev. & CMO

Signatures

By: Russell J. Wood For: Paul D. Rubin		03/20/2015
**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)	These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on March 18, 2013.
(2)	Each restricted stock unit represents the right to receive, at settlement, one share of common stock. This nondiscretionary transaction represents the settlement of vested restricted stock units in shares of common stock.
(3)	These restricted stock units are scheduled to vest in substantially equal installments annually over three years, with the first installment vesting on March 18, 2014.
(4)	Shares sold on the open market to satisfy the minimum amount of taxes required to be withheld in connection with the vesting of the shares in a non-discretionary transaction pursuant to the reporting person's agreement under the Company's equity incentive plan.
(5)	This transaction was executed in multiple trades ranging at prices from $3.93 to $4.15.The price reported reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the Issuer or a security holder of the Issuer full information regarding the number of shares and prices at which the transactions were effected.

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