UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D

(Rule 13d-101)

INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT

TO § 240.13d-1(a) AND AMENDMENTS THERETO FILED PURSUANT TO

§ 240.13d-2(a)

(Amendment No. 9)¹

XOMA Corporation

(Name of Issuer)

Common Stock, $0.0075 par value

(Title of Class of Securities)

98419J 206

(CUSIP Number)

JAMES KRATKY

BVF Partners L.P.

44 Montgomery St., 40th Floor

San Francisco, California 94104

(415) 525-8890

ADAM W. FINERMAN, ESQ.

OLSHAN FROME WOLOSKY LLP

1325 Avenue of the Americas

New York, New York 10019

(212) 451-2300

(Name, Address and Telephone Number of Person

Authorized to Receive Notices and Communications)

March 31, 2021

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box ☒.

Note:  Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits.  See § 240.13d-7 for other parties to whom copies are to be sent.

1              The remainder of this cover page shall be filled out for a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

(1) Excludes 2,313,000 Shares underlying certain Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 2,313,000 Shares underlying certain Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 1,506,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 1,506,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 412,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 412,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 3,819,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Excludes 5,003,000 Shares underlying Series X Convertible Preferred Stock as described below in Item 5.

(1) Includes 34,593 Shares issuable on the exercise of certain options that are exercisable within sixty days hereof.

(2) Excludes 200,000 shares of the Series A Preferred Stock as described in Item 6 below.

The following constitutes Amendment No. 9 to the Schedule 13D filed by the undersigned (the “Amendment No. 9”). This Amendment No. 9 amends the Schedule 13D as specifically set forth herein.

The first paragraph of Item 3 is hereby amended and restated to read as follows:

The Shares purchased by BVF, BVF2 and Trading Fund OS were purchased with working capital (which may, at any given time, include margin loans made by brokerage firms in the ordinary course of business) in open market purchases, except as otherwise noted. The aggregate purchase price of the 1,760,384 Shares owned directly by BVF is approximately $19,632,951, including brokerage commissions. The aggregate purchase price of the 1,544,897 Shares owned directly by BVF2 is approximately $18,219,052, including brokerage commissions. The aggregate purchase price of the 75,287 Shares owned directly by Trading Fund OS is approximately $303,407, including brokerage commissions. The aggregate purchase price of the 149,975 Shares held in the Partners Managed Accounts is approximately $641,166, including brokerage commissions.

Item 5(a)-(c) is hereby amended and restated as follows:

(a)       The aggregate percentage of Shares reported owned by each person named herein is based on a denominator that is the sum of: (i) 11,253,256 Shares outstanding as of March 26, 2021, which is the total number of Shares outstanding as reported in the Issuer’s preliminary proxy statement on Form PRE14A filed with the Securities and Exchange Commission on March 26, 2021 and (ii) with respect to Mr. Perry, 34,593 Shares issuable on the exercise of certain options.

As of the date hereof, the Reporting Persons hold 5,003 shares of Series X Preferred Stock, convertible into an aggregate of 5,003,000 Shares. Each share of Series X Preferred Stock is convertible into 1,000 Shares. The Series X Preferred Stock may not be converted if, after such conversion, the Reporting Persons would beneficially own, as determined in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), more than 19.99% of the Shares outstanding immediately after giving effect to such conversion (the “Series X Beneficial Ownership Limitation”). As of the date hereof, the Series X Beneficial Ownership Limitation, limits the aggregate conversion of the Series X Preferred Stock by the Reporting Persons to zero out of the 5,003,000 Shares underlying the Series X Preferred Stock.

As of the date hereof, (i) BVF beneficially owned 1,760,384 Shares, excluding 2,313,000 Shares issuable upon the conversion of certain Series X Preferred Stock, representing percentage ownership of approximately 15.6% of the Shares outstanding, (ii) BVF2 beneficially owned 1,544,897 Shares, excluding 1,506,000 Shares issuable upon the conversion of certain Series X Preferred Stock, representing percentage ownership of approximately 13.7% of the Shares outstanding, (iii) Trading Fund OS beneficially owned 75,287 Shares, excluding 412,000 Shares issuable upon the conversion of certain Series X Preferred Stock, representing percentage ownership of less than 1% of the Shares outstanding, and (iv) 149,975 Shares were held in the Partners Managed Accounts, excluding 772,000 Shares issuable upon the conversion of certain Series X Preferred Stock, representing percentage ownership of approximately 1.3% of the Shares outstanding.

BVF GP, as the general partner of BVF, may be deemed to beneficially own the 1,760,384 Shares beneficially owned by BVF, representing percentage ownership of approximately 15.6% of the Shares outstanding.

BVF2 GP, as the general partner of BVF2, may be deemed to beneficially own the 1,544,897 Shares beneficially owned by BVF2, representing percentage ownership of approximately 13.7% of the Shares outstanding.

Partners OS, as the general partner of Trading Fund OS, may be deemed to beneficially own the 75,287 Shares beneficially owned by Trading Fund OS, representing percentage ownership of less than 1% of the Shares outstanding.

BVF GPH, as the sole member of each of BVF GP and BVF2 GP, may be deemed to beneficially own the 3,305,281 Shares beneficially owned in the aggregate by BVF and BVF2, representing percentage ownership of approximately 29.4% of the Shares outstanding.

Partners, as the investment manager of BVF, BVF2, Trading Fund OS and the Partners Managed Accounts and the sole member of Partners OS, may be deemed to beneficially own the 3,530,543 Shares beneficially owned in the aggregate by BVF, BVF2, Trading Fund OS, and held in the Partners Managed Accounts, representing percentage ownership of approximately 31.4% of the Shares outstanding.

BVF Inc., as the general partner of Partners, may be deemed to beneficially own the 3,530,543 Shares beneficially owned by Partners, representing percentage ownership of approximately 31.4% of the Shares outstanding.

Mr. Lampert, as a director and officer of BVF Inc. may be deemed to beneficially own the 3,530,543 Shares beneficially owned by BVF Inc., representing percentage ownership of approximately 31.4% of the Shares outstanding.

As of the date hereof, Mr. Perry beneficially owned 46,392 Shares, including 34,593 Shares issuable on the exercise of certain options that are exercisable within sixty days hereof, representing percentage ownership of less than 1%.

(b)       Each of BVF, BVF2 and Trading Fund OS shares with Partners voting and dispositive power over the Shares each such entity beneficially owns. BVF shares with BVF GP voting and dispositive power over the Shares beneficially owned by BVF. BVF2 shares with BVF2 GP voting and dispositive power over the Shares beneficially owned by BVF2. Each of BVF GP and BVF2 GP shares with BVF GPH voting and dispositive power over the Shares each such entity beneficially owns. Trading Fund OS shares with Partners OS voting and dispositive power over the Shares beneficially owned by Trading Fund OS. Partners, BVF Inc. and Mr. Lampert share voting and dispositive power over the 3,530,543 Shares they may be deemed to beneficially own with BVF, BVF GP, BVF2, BVF2 GP, Trading Fund OS, Partners OS, BVF GPH and the Partners Managed Accounts.

(c)       Schedule A annexed hereto lists all transactions in securities of the Issuer by the Reporting Persons since the filing of Amendment No. 8 to the Schedule 13D. All of such transactions were privately negotiated through a broker.

The filing of this Schedule 13D shall not be deemed an admission that the Reporting Persons are, for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, the beneficial owners of any securities of the Issuer that he or it does not directly own. Each of the Reporting Persons specifically disclaims beneficial ownership of the securities reported herein that he or it does not directly own.

SIGNATURES

After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct.

Dated: April 2, 2021

SCHEDULE A

Transactions in the Securities of the Issuer Since the Filing of Amendment No. 8 to the Schedule 13D

BIOTECHNOLOGY VALUE FUND, L.P.

BIOTECHNOLOGY VALUE FUND II, L.P.

BIOTECHNOLOGY VALUE TRADING FUND OS LP

BVF PARTNERS L.P. (THROUGH THE PARTNERS MANAGED ACCOUNTS)