7. Stockholders' Equity and Warrants

2024 Private Placement

On December 27, 2024, the Company entered into a purchase agreement with certain institutional investors (collectively, the “2024 Purchasers”), pursuant to which the Company issued and sold to the 2024 Purchasers in a private placement an aggregate of (i) 2,793,562 shares of the Company's common stock and (ii) warrants to purchase up to 3,491,953 shares of the Company's common stock (the “2024 Warrants”) at the closing of the private placement on December 30, 2024. Net proceeds from the private placement were $52.7 million, after deducting placement fees and issuance costs payable by the Company.

The 2024 Warrants have an exercise price of $16.76 per share and are immediately exercisable, subject to certain limitations on exercise set forth in the 2024 Warrants. The 2024 Warrants will terminate seven years from issuance on December 30, 2031.

The Company determined that the 2024 Warrants are freestanding instruments that do not meet the definition of a liability or derivative. The 2024 Warrants are indexed to the Company’s common stock and meet all other conditions for equity classification. Accordingly, the 2024 Warrants were classified as equity and accounted for as a component of additional paid-in capital at the time issued. The Company also determined that the 2024 Warrants should be included in the determination of diluted net loss per share if their impact is dilutive. However, they are not included within diluted net loss per share for the three months ended March 31, 2026 or 2025 as their effect would be antidilutive.
 

As of March 31, 2026, none of the 2024 Warrants have been exercised.

June 2025 Private Placement

On June 25, 2025, the Company entered into a purchase agreement with certain institutional investors (collectively, the “2025 Purchasers”), pursuant to which the Company issued and sold to the 2025 Purchasers in a private placement warrants to purchase up to an aggregate of 34,999,999 shares of the Company's common stock (the “2025 PIPE Warrants”) at the closing on June 27, 2025. Net proceeds from the private placement were $174.4 million, after deducting issuance costs payable by the Company. In addition to the 2025 PIPE Warrants, on June 25, 2025 the Company issued a warrant to purchase up to 16,000,000 shares of the Company’s common stock as partial consideration for the Telitacicept License Agreement (as defined below) to a subsidiary of RemeGen Co., Ltd.

(“RemeGen Warrant”). Refer to Note 10 for additional information on the license arrangement. The 2025 PIPE Warrants and RemeGen Warrant are collectively referred to as the 2025 Warrants.

The 2025 Warrants have an exercise price of $0.002 per share and became exercisable upon stockholder approval of the issuance of the underlying shares and an amendment to the certificate of incorporation to increase the number of authorized shares, subject to certain limitations on exercise set forth in the 2025 Warrants. On August 25, 2025, the stockholders approved the issuance of the underlying shares and on September 17, 2025, the Company filed a Certificate of Amendment to its Amended and Restated Certificate of Incorporation with the Secretary of State of the State of Delaware to effect a reverse stock split, resulting in sufficient available authorized shares for warrant holders to exercise the 2025 Warrants. The 2025 Warrants do not expire.

Upon issuance, the 2025 Warrants were liability-classified as they are not considered indexed to the Company’s common stock. The 2025 Warrants are measured at fair value each period with changes in fair value presented within the condensed consolidated statements of operations and comprehensive loss. The valuation of the 2025 Warrants is classified within Level 2 of the fair value hierarchy due to the use of observable market inputs, primarily the quoted price of the Company’s common stock underlying the warrants. The initial carrying value of the 2025 PIPE Warrants and the RemeGen Warrant at issuance was $175.0 million and $177.4 million, respectively. Issuance costs related to the 2025 PIPE Warrants were expensed as incurred.

The Company also determined the 2025 Warrants should be included in the determination of diluted net loss per share if their impact is dilutive. However, they are not included within diluted net loss per share for the three months ended March 31, 2026 as the effect would be antidilutive.

During the three months ended March 31, 2026, 10,128,187 of the 2025 Warrants were exercised for an immaterial amount of net proceeds. Some of the exercises were completed via cashless exercise, which resulted in slightly less shares issued than warrants exercised for such transactions. The remaining 35,792,172 outstanding 2025 Warrants have a fair value of $638.5 million as of March 31, 2026.

November 2025 Public Offering

On November 10, 2025, the Company entered into an underwriting agreement relating to the issuance and sale in a public offering of 11,500,000 shares of the Company’s common stock, including 1,500,000 shares purchased by the underwriters under a 30-day option to purchase additional shares (the “November 2025 Offering”) at a public offering price of $10.00 per share. The net proceeds to the Company from the November 2025 Offering were $107.7 million after deducting the underwriting discounts and commissions and offering expenses.

December 2025 Private Placement

On December 15, 2025, the Company entered into a securities purchase agreement with certain investors pursuant to which the Company, in a private placement, issued and sold an aggregate of 13,876,032 shares of common stock, at a price per share of $10.81, for net proceeds of $149.9 million after deducting offering expenses (the “December 2025 Private Placement”).

March 2026 Private Placement

On March 26, 2026 the Company entered into a securities purchase agreement with entities affiliated with TCG Crossover Management, LLC (“TCGX”) pursuant to which the Company, in a private placement, issued and sold an aggregate of 5,338,078 shares of common stock, at a price per share of $14.05, for net proceeds of $74.9 million after deducting offering expenses (the “March 2026 Private Placement”). The private placement closed on March 30, 2026.