12. Capital Stock

Series X and Series Y Convertible Preferred Stock

The Company sold directly to BVF 5,003 shares of Series X Convertible Preferred Stock in 2017 and 1,252.772 shares of Series Y Convertible Preferred Stock in 2018. There were no shares of Series Y Convertible Preferred Stock outstanding as of December 31, 2021, after BVF converted all Series Y Convertible Preferred Stock into common stock on April 15, 2020.

As of December 31, 2023 and 2022, there were 5,003 shares authorized and issued of Series X Convertible Preferred Stock.

The Series X and Series Y Convertible Preferred Stock have the following characteristics, which are set forth in Certificates of Designation of Preferences, Rights and Limitations filed with the Delaware Secretary of State.

Dividends— Holders of convertible preferred stock are entitled to receive dividends on shares of convertible preferred stock equal (on an as if converted to common stock basis) to and in the same form as dividends actually paid on the Company’s common stock.

Liquidation Rights— In the event of the Company’s liquidation, dissolution or winding up, holders of convertible preferred stock will participate, on a pro-rata basis, with any distribution of proceeds to holders of common stock.

Conversion— Each share of Series X and Series Y Convertible Preferred Stock is convertible into 1,000 shares of registered common stock based on a conversion price of $4.03 per share and $13.00 per share of common stock respectively.

Voting Rights— Series X and Series Y Convertible Preferred Stock will generally have no voting rights, except as required by law and except that the consent of the holders of the outstanding convertible preferred stock will be required to amend the terms and to issue additional shares of the preferred stock.

Classification— The Company evaluated the convertible preferred stock for liability or equity classification under the applicable accounting guidance and determined that equity treatment was appropriate because the convertible preferred stock did not meet the definition of the liability instruments defined thereunder for convertible instruments. Specifically, the shares of Series X and Series Y Convertible Preferred Stock are not mandatorily redeemable and do not embody an obligation to buy back the shares outside of the Company’s control in a manner that could require the transfer of assets. Additionally, the Company determined that the convertible preferred stock would be recorded as permanent equity, not temporary equity, given that they are not redeemable for cash or other assets (i) on a fixed or determinable date, (ii) at the option of the holder, and (iii) upon the occurrence of an event that is not solely within control of the Company. The Company has also evaluated the embedded conversion and contingent redemption features within the Series X and Series Y Convertible Preferred Stock in accordance with the accounting guidance for derivatives and determined that bifurcation is not required for any embedded feature.

Series A Preferred Stock

On December 15, 2020, the Company sold 984,000 shares of its 8.625% Series A cumulative, perpetual preferred stock at the price of $25.00 per share, through a public offering for aggregate gross proceeds of $24.6 million. Total offering costs of $2.0 million were offset against the proceeds from the sale of Series A Preferred Stock, for total net proceeds of $22.6 million.

As of December 31, 2023 and 2022, there were 984,000 shares authorized and issued of Series A Preferred Stock.

The Series A preferred stock have the following characteristics, which are set forth in the Certificates of Designation of Preferences, Rights and Limitations filed with the Delaware Secretary of State.

Dividends— Holders of the Series A Preferred Stock shall be entitled to receive, when, and if authorized by the Board and declared by the Corporation, cumulative cash dividends at the rate of 8.625% per annum of the $25.00 liquidation preference per share of the Series A Preferred Stock. Such dividends will accumulate and be cumulative from, and including, the date of original issue of the Series A Preferred Stock. Dividends will be payable in arrears on or about the 15th day of January, April, July and October of each year beginning on or about April 15, 2021. The amount of any dividend payable on the Series A Preferred Stock for any period greater or less than a full dividend period shall be prorated and computed on the basis of a 360-day year consisting of twelve 30-day months. 

Liquidation Rights— In the event of the Company’s liquidation, dissolution or winding up, holders of Series A Preferred Stock will rank senior to all classes or series of common stock as to dividend rights and rights upon liquidation, dissolution or winding-up and on parity with respect to the distribution of assets with the Company’s Series X Preferred Stock. The Series A Preferred Stock have a par value of $0.05 per share and a liquidation preference of $25.00 per share plus any accrued and unpaid dividends.

Redemption and Special Optional Redemption— The Company, at its option, may redeem the Series A Preferred Stock, in whole or in part, at any time for a cash redemption price, plus any accrued and unpaid dividends, as follows: (i) $26.00 per share between December 15, 2021 and December 15, 2022, (ii) $25.75 per share between December 15, 2022 and December 15, 2023, (iii) $25.50 per share between December 15, 2023 and December 15, 2024 (iv) $25.25 per share between December 15, 2024 and December 15, 2025 and $25.00 per share on or after December 15, 2025. The Company also has a special optional redemption option whereby, upon the occurrence of a delisting event or change of control event, the Company may redeem outstanding Series A Preferred Stock at an amount of $25.00 per share.

Conversion— The shares of Series A Preferred Stock are not convertible into or exchangeable for any other property or securities of the Company except upon the occurrence of a delisting event or change in control event and the Company has not, on or before the date of such an event, provided the required notice of its election to redeem the Series A Preferred Stock pursuant to its redemption right or special optional redemption right. In this case, the holder of shares of Series A Preferred Stock can convert some or all of their Series A Preferred Stock into a number of shares of common stock per share equal to the lesser of (A) (i) the sum of the $25.00 liquidation preference per share of Series A Preferred Stock to be converted plus (ii) the amount of any accrued and unpaid dividends to, but not including, the event date, as applicable, divided by (iii)  the common stock price and (B) 1.46071 (the “Share Cap”). The common stock price to be

used in the latter noted calculation for a delisting event will be the average of the closing price per share of the Company’s common stock on the 10 consecutive trading days immediately preceding, but not including, the effective date of the delisting event. The common stock price used in the event of a change in control event will, alternatively, be based on market price according to the definition in the Certificate of Designation.

Voting Rights— Holders of 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.

Classification—The Company evaluated the Series A Preferred Stock for liability or equity classification under the applicable accounting guidance and determined that treatment as equity was appropriate.

Depositary Shares Representing Interest in Series B Preferred Stock

On April 9, 2021, the Company sold 1,600,000 Series B Depositary Shares, at the price of $25.00 per Series B Depositary Share, through a public offering for aggregate gross proceeds of $40.0 million. Each Series B Depositary Share represents 1/1000 interest in a share of Series B Preferred Stock. Total offering costs of $2.9 million were offset against the proceeds from the sale of Series B Depositary Shares, for net proceeds of $37.1 million.

The spouse of James Neal, then Chief Executive Officer and Chairman of the Board, purchased 8,000 shares of the Series B Depositary Shares in the public offering at the public offering price of $25.00 per share for an aggregate amount of $0.2 million.

As of December 31, 2023 and 2022, there were 3,600 shares authorized and 1,600 issued of Series B Preferred Stock.

The Series B Preferred Stock has the following characteristics, which are set forth in the Certificate of Designation of 8.375% Series B Cumulative Perpetual Preferred Stock, as corrected, filed with the Delaware Secretary of State.

Dividends— Holders of Series B Preferred Stock shall be entitled to receive cash dividends, when and if declared by the Board at the rate of 8.375% per annum of the $25,000.00 liquidation preference per share, which equals $2,093.75 per share each year. Such dividends shall be payable quarterly in arrears on or about the 15th calendar day of each January, April, July and October commencing on or about July 15, 2021. The dividends will accumulate and be cumulative from, and including, the date of original issue of the Series B Preferred Stock, on the basis of a 360-day year consisting of twelve 30-day months. Dividends will be payable to holders of record as they appear in the stockholder records of the Company (or the depositary in the case of Series B Depositary Shares representing underlying Series B Preferred Stock) at the close of business on the applicable dividend record date.

Liquidation Preference - Upon any voluntary or involuntary liquidation, dissolution or winding up of the Company, before any distribution or payment shall be made to holders of shares of Common Stock or any other class or series of capital stock of the Company ranking junior to the Series B Preferred Stock, the holders of shares of Series B Preferred Stock shall be paid out of the assets of the Company, after payment of or provision for the debts and other liabilities and any class or series of capital stock, as to rights upon any voluntary or involuntary liquidation, dissolution or winding up, senior to the Series B Preferred Stock. The Series B Preferred Stock have a par value of $0.05 per share and a liquidation preference of $25,000.00 per share plus any accrued and unpaid dividends.

Redemption and Special Optional Redemption - On and after April 15, 2022, the Company, at its option, may redeem the Series B Preferred Stock, for cash, in whole or in part, at any time or from time to time, as follows: (i) between April 15, 2022 to April 15, 2023, at a redemption price of $26,000.00 per share ($26.00 per depositary share), (ii) between April 15, 2023 to April 15, 2024, at a redemption price of $25,750.00 per share ($25.75 per depositary share), (iii) between April 15, 2024 to April 15, 2025, at a redemption price of $25,500.00 per share ($25.50 per depositary share), (iv) between April 15, 2025 to April 15, 2026, at a redemption price of $25,250.00 per share ($25.25 per depositary share), and (v) after April 15, 2026, at a redemption price of $25,000.00 per share ($25.00 per depositary share), and in each case, plus any accrued and unpaid dividends thereon up to but not including the date fixed for redemption, without interest. If fewer than

all of the outstanding shares of Series B Preferred Stock are to be redeemed, the shares to be redeemed will be determined pro rata or by lot. Upon the occurrence of a delisting event or change of control the Company will have the option to redeem the Series B Preferred Stock, in whole or in part, for cash at $25,000.00 per share plus accrued and unpaid dividends.

Conversion - The shares of Series B Preferred Stock are not convertible into or exchangeable for any other property or securities of the Company, except upon the occurrence of a delisting event or a change of control, each holder Series B Preferred Stock will have the right (unless the Company has elected to redeem the Series B Preferred Stock) to convert some or all of the shares of Series B Preferred Stock held by such holder on the delisting event conversion date or change of control conversion date into a number of shares of the common stock (or equivalent value of alternative consideration) per share of Series B Preferred Stock, equal to the lesser of (A) the quotient obtained by dividing (1) the sum of the $25,000.00 per share liquidation preference plus the amount of any accumulated and unpaid dividends up to, but not including, the delisting event conversion date or change of control conversion date, as applicable (unless the delisting event conversion date or change of control conversion date, is after a record date for a Series B Preferred Stock dividend payment and prior to the corresponding Series B Preferred Stock dividend payment date, in which case no additional amount for such accumulated and then remaining unpaid dividend will be included in this sum) by (2) the common stock price (such quotient, the “Conversion Rate”); and (B) 1,253.13 (1.25313 per depositary share) (i.e., the “Share Cap”), subject to certain adjustments described in the Series B Preferred Stock Certificate of Designation.

Voting Rights— Holders of the Series B 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.

Classification—The Company evaluated the Series B Preferred Stock for liability or equity classification under the applicable accounting guidance and determined that treatment as equity was appropriate.

Dividends

During the year ended December 31, 2023, the Company’s Board declared and paid cash dividends on the Company’s Series A Preferred Stock and Series B Depositary shares as follows:

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BVF Ownership

As of December 31, 2023, BVF owned approximately 31.6% of the Company’s total outstanding shares of common stock, and if all the shares of Series X Convertible Preferred Stock were converted (without taking into account beneficial ownership limitations), BVF would own 52.3% of the Company’s total outstanding shares of common stock. The Company’s Series A Preferred Stock becomes convertible upon the occurrence of specific events and as of December 31, 2023, the contingency was not met, therefore the Series A Preferred Stock owned by BVF is not included in the as-converted ownership calculation. Due to its significant equity ownership, BVF is considered a related party of the Company.

2018 Common Stock ATM Agreement

On December 18, 2018, the Company entered into the 2018 Common Stock ATM Agreement with HCW, under which the Company may offer and sell from time to time at its sole discretion shares of its common stock through HCW as its sales agent, in an aggregate amount not to exceed $30.0 million. HCW may sell the shares by any method permitted

by law deemed to be an “at the market” offering as defined in Rule 415 of the Securities Act and will use its commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares up to the amount specified. The Company will pay HCW a commission of up to 3% of the gross proceeds of any shares of common stock sold under the 2018 Common Stock ATM Agreement. On March 10, 2021, the Company amended the 2018 Common Stock ATM Agreement with HCW to increase the aggregate amount of shares of its common stock that it could sell through HCW as its sales agent to $50.0 million. No shares have been sold under the 2018 Common Stock ATM Agreement since the agreement was executed.

2021 Series B Preferred Stock ATM Agreement

On August 5, 2021, the Company entered into the 2021 Series B Preferred Stock ATM Agreement with B. Riley, under which the Company may offer and sell from time to time, at its sole discretion, through or to B. Riley, as agent or principal an aggregate amount not to exceed $50.0 million of its Series B Depositary Shares. B. Riley may sell the shares by any method permitted by law deemed to be an “at the market” offering as defined in Rule 415 of the Securities Act, and will use its commercially reasonable efforts consistent with its normal trading and sales practices to sell the shares up to the amount specified. The Company will pay B. Riley a commission of up to 3% of the gross proceeds of any Series B Depositary Shares sold under the 2021 Series B Preferred Stock ATM Agreement. No shares have been sold under the 2021 Series B Preferred Stock ATM Agreement since the agreement was executed.

Common Stock Warrants

As of December 31, 2023 and 2022, the following common stock warrants were outstanding:

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In May 2018, the Company issued SVB a warrant in connection with the legacy SVB Loan Agreement which is exercisable in whole or in part for up to an aggregate of 6,332 shares of common stock with an exercise price of $23.69 per share. The warrant may be exercised on a cashless basis and is exercisable within 10 years from the date of issuance or upon the consummation of certain acquisitions of the Company. The fair value of the warrant issued to SVB was determined using the Black-Scholes Model and was estimated to be $0.1 million. The warrant is classified in stockholders’ equity on the consolidated balance sheets.

In March 2019, the legacy SVB Loan Agreement was amended to extend the draw period from March 31, 2019 to March 31, 2020. In connection with the amendment, the Company issued a second warrant to SVB which is exercisable in whole or in part for up to an aggregate of 4,845 shares of common stock with an exercise price of $14.71 per share. The second warrant may be exercised on a cashless basis and is exercisable within 10 years from the date of issuance or upon the consummation of certain acquisitions of the Company. The fair value of the second warrant issued to SVB was determined using the Black-Scholes Model and was estimated to be $0.1 million. The warrant is classified in stockholders’ equity on the consolidated balance sheets.

In December 2023, in connection with the Blue Owl Loan, the Company issued the Blue Owl Warrants to certain funds affiliated with Blue Owl, which are exercisable in whole or in part to purchase up to an aggregate of 120,000 shares of the Company’s common stock, inclusive of warrants to purchase (i) up to 40,000 shares of XOMA’s common stock at an exercise price of $35.00 per share; (ii) up to 40,000 shares of XOMA’s common stock at an exercise price of $42.50 per share; and (iii) up to 40,000 shares of XOMA’s common stock at an exercise price of $50.00 per share. The Blue Owl Warrants may be exercised on a cashless basis and are exercisable within 10 years from the date of issuance or upon the consummation of certain acquisitions of the Company.

The fair value per share of Blue Owl Warrants issued at the exercise prices of $35.00, $42.50 and $50.00 per share during the fourth quarter of 2023 was determined using the Black-Scholes Model to be $12.53, $12.23 and $11.97 per share, respectively, based on the following weighted average assumptions:

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The aggregate fair value of the Blue Owl Warrants of $1.5 million is classified in stockholders’ equity on the consolidated balance sheets.