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STOCKHOLDERS' EQUITY
 12 Months Ended
Dec. 31, 2025
STOCKHOLDERS' EQUITY  
STOCKHOLDERS' EQUITY

6. STOCKHOLDERS’ EQUITY

October 2025 Warrant Inducement

On October 7, 2025, the Company entered into warrant exercise inducements with certain holders of certain existing warrants, which were originally issued on October 25, 2022, July 21, 2024, and July 2, 2025, pursuant to which the holders agree to exercise for cash their existing warrants to purchase 1,048,094 shares of the Company’s common stock, at an exercise price of $5.25 per share, and pay $0.125 per new warrant, in exchange for the Company’s agreement to issue two new warrants for each warrant exercised. In connection with the exercise of these warrants, the Company issued new warrants (the October 2025 Inducement Warrants) in two different series: the Series I Inducement Warrants and the Series II Inducement Warrants. Each Inducement Warrant is immediately exercisable at an exercise price of $6.00 per share. The Series I Inducement Warrants will expire on October 8, 2030, and the Series II Inducement Warrants will expire on April 8, 2027. The investors paid $0.125 for each October 2025 Inducement Warrant. The gross proceeds to the Company from the warrant exercises and new warrant issuance was approximately $5.8 million, prior to deducting placement agent fees and offering expenses. Based upon an evaluation utilizing the criteria in ASC 480, Distinguishing Liabilities from Equity, the company concluded that the Common Warrants do not meet any of the conditions necessary to be classified as a liability. Furthermore, based upon an assessment utilizing ASC 815, Derivatives and Hedging, the Common Warrants meet all the necessary criteria to be classified as permanent equity.

July 2025 Underwritten Public Offering

On July 2, 2025, the Company completed an underwritten public offering for gross proceeds of approximately $6.9 million, prior to deducting underwriting commissions and offering expenses. The offering was composed of (i) 1,045,000 Class A Units (which includes 180,000 Class A Units issued pursuant to the Underwriter’s exercise of the over-allotment option in full) with each Class A Unit consisting of (a) one share of common stock and (b) one common warrant to purchase one share of common stock (the Common Warrants), and (ii) 335,000 Class B Units with each Class B Unit consisting of (a) one pre-funded common stock purchase warrant to purchase one share of common stock (Pre-funded Warrants) and (b) one Common Warrant. The price per Class A Unit is $5.00 and the price per Class B Unit is $4.99999 (collectively, the Offering). The Common Warrants have an exercise price of $5.25 per share, are exercisable upon issuance, and have a term expiring five years from issuance. Based upon an evaluation utilizing the criteria in ASC 480, Distinguishing Liabilities from Equity, the company concluded that the Common Warrants do not meet any of the conditions necessary to be classified as a liability. Furthermore, based upon an assessment utilizing ASC 815, Derivatives and Hedging, the Common Warrants meet all the necessary criteria to be classified as permanent equity. The Company also issued 82,800 common stock purchase warrants (representative warrants) to the underwriter upon the closing of the July 2025 offering. The representative warrants have an exercise price equal to $7.75 per share of common stock, were exercisable immediately upon issuance and have a term expiring five years from issuance.

2025 Reverse Stock Split

At the annual stockholders’ meeting held on June 23, 2025, the Company’s stockholders approved an amendment to the Company’s certificate of incorporation to effect a reverse split of the Company’s common stock at a ratio between one-for-ten (1:10) to one-for-thirty (1:30) in order to satisfy requirements for the continued listing of the Company’s common stock on Nasdaq. The board of directors authorized the 1:30 ratio of the reverse split on June 18, 2025, and effective at the close of business on June 24, 2025, the Company’s certificate of incorporation was amended to effect a 1:30 reverse split of the Company’s common stock (the Reverse Stock Split). The Reverse Stock Split did not impact authorized shares. The accompanying consolidated financial statements and notes to consolidated financial statements give retroactive effect to the Reverse Stock Split for all periods presented.

June 2025 Warrant Inducement

On June 6, 2025, the Company entered into definitive agreements for investors to immediately exercise certain outstanding warrants to purchase an aggregate of 276,044 shares of common stock, issued by the company on June 5, 2020, October 25, 2022, and July 21, 2024 (the Existing Warrants), at a reduced exercise price of $9.123 per share. The shares of common stock issuable upon exercise of the Existing Warrants are all registered, or their resale is registered, pursuant to effective registration statements. The Company did not issue any new warrants as part of the agreements. The gross proceeds to the Company from the exercise of the Existing Warrants was approximately $2.5 million, prior to deducting placement agent fees and offering expenses.

July 2024 Warrant Inducement

On July 21, 2024, the Company, entered into a warrant exercise inducement (the Inducement) with certain holders of its September 2023 Tranche B warrants, pursuant to which the holders agreed to exercise the warrants to purchase 1,610 shares of the Company’s Series E-4 Convertible Voting Preferred Stock, par value $0.00001 per share (the Series E-4 preferred stock) which is convertible to 224,663 shares of the Company’s common stock in the aggregate, at a reduced, as-converted common stock price of $75.60 per share, in exchange for the Company’s issuance of new warrants (the July 2024 Inducement Warrants), with varying termination dates and exercise prices. The Company received gross proceeds of $19.4 million and net proceeds of $17.5 million.

The July 2024 Inducement Warrants have the following terms:

●The 2024 Tranche A warrants have an exercise price of $75.60 and expire at the earlier of (i) ten (10) trading days following the date of the Company’s public announcement that the FDA has assigned a Prescription Drug User Fee Act goal date for review of iopofosine I 131, and (ii) July 21, 2029.
●The 2024 Tranche B warrants have an exercise price of $120.00 and expire at the earlier of (i) ten (10) trading days following the date of the Company’s public announcement of its receipt of written approval from the FDA of its New Drug Application for iopofosine I 131, and (ii) July 21, 2029.
●The 2024 Tranche C warrants have an exercise price of $165.00 and expire at the earlier of (i) ten (10) trading days following the date of the Company’s public announcement that it has recorded quarterly gross revenues from sales of iopofosine I 131 in the United States in excess of $10 million and (ii) July 21, 2029.
●The July 2024 Inducement Warrants do not qualify under the equity classification guidance because of a cash settlement feature that requires cash settlement in event of a fundamental transaction that is outside the Company’s control resulting in a form of settlement inconsistent with that which would be received by other security holders. As a result, and in accordance with the guidance in ASC 815, the warrants issued in July 2024 are deemed to be liabilities. All such liabilities are required to be presented at fair value, with changes reflected in financial results for the period. In accordance with the guidance above, the Company recorded the July 2024 Inducement Warrants and preferred stock at their respective fair values. See Note 3 for the related valuation.

September 2023 Private Placement

On September 8, 2023, in a private placement with certain institutional investors, the Company issued 1,225 shares of Series E-1 preferred stock, along with Tranche A warrants to purchase 2,205 shares of Series E-3 preferred stock and Tranche B warrants to purchase 1,715 shares of Series E-4 preferred stock.

The Series E-1 preferred stock automatically converted either to Series E-2 preferred or common stock upon stockholder approval, which occurred on October 25, 2023.

The July 2024 Warrant Inducement described above resulted in 105.000 Tranche B warrants remaining outstanding, which are convertible into 14,652 shares of common stock. The Tranche B warrants do not qualify as derivatives; however, they also do not meet the requirements necessary to be considered indexable in the Company’s stock. As a result, and in accordance with the guidance in ASC 815, the warrants are deemed to be liabilities. All such liabilities are required to be presented at fair value, with changes reflected in financial results for the period. See Note 3 for the related valuation.

There are 35.60 shares of Series E-2 preferred stock outstanding as of December 31, 2025.

October 2022 Public Offering and Private Placement

On October 25, 2022, the Company completed a registered direct offering and concurrent private placement transaction. As of December 31, 2025, there remain 75,939 warrants outstanding that are immediately exercisable at an exercise price of $58.80 per share and will expire on the fifth anniversary of the closing date. Due to a cash settlement feature, the warrants are liability classified. See Note 3 for the related valuation.

The following table summarizes information with regard to outstanding warrants to purchase stock as of December 31, 2025:

​

​

​

​

​

​

​

​

​

​

​

Number of Common

​

​

​

​

​

​

​

Shares Issuable

​

​

​

​

​

​

​

Upon

​

​

​

​

​

​

​

Exercise of

​

​

​

​

​

​

​

Outstanding

​

Exercise

​

​

Offering

  ​ ​ ​

Warrants

  ​ ​ ​

Price

  ​ ​ ​

Expiration Date

2025 October Series I Common Warrants

​

1,048,094

​

$

6.00

​

October 8, 2030

2025 October Series II Common Warrants

​

1,048,094

​

$

6.00

​

April 8, 2027

2025 July Common Warrants

 

436.000

​

$

5.25

​

July 2, 2030

2025 Representative Warrants

 

82,800

​

$

7.75

​

July 2, 2030

2024 Tranche A Warrants

​

114,773

​

$

75.60

​

July 21, 2029

2024 Tranche B Warrants

​

139,877

​

$

120.00

​

July 21, 2029

2024 Tranche C Warrants

​

72,663

​

$

165.00

​

July 21, 2029

2023 Tranche B Preferred Warrants

 

14,652

​

$

143.25

​

September 8, 2028

2022 Common Warrants

 

75,939

​

$

58.80

​

October 25, 2027

Total

 

3,032,892

​

 

  ​

​

​

​

The 2025 October Series I and Series II Common Warrants, the 2025 July Common Warrants, and the 2025 Representative Warrants are classified as equity. All other warrants in the table above are liability classified.