Note 4. Convertible Instruments and Accrued Interest

Convertible preferred stock

The following table presents the number of potentially issuable shares of common stock, should shares of preferred stock and amounts of undeclared and accrued preferred dividends be converted to common stock.

​

​

Under the Company’s Amended and Restated Certificate of Incorporation, as amended (the “Certificate of Incorporation”), dividends on its outstanding shares of Series B Convertible Preferred Stock (the “Series B preferred stock”) may be paid in cash or shares of the Company’s common stock at the election of the Company. Dividends on outstanding shares of Series C Convertible Preferred Stock (the “Series C preferred stock”) and Series D Convertible Preferred Stock (the “Series D preferred stock”) are payable in cash or shares of common stock at the election of the holder. The preferred stockholders have the right to dividends only when and if declared by the Company’s Board of Directors. Under Section 170 of the Delaware General Corporation Law, the Company is permitted to pay dividends only out of capital surplus or, if none, out of net profits for the fiscal year in which the dividend is declared or net profits from the preceding fiscal year.

Series B preferred stock provides for a liquidation preference over the common shares of $5.00 per share, plus any accrued and unpaid dividends. In the event of liquidation, holders of Series C and Series D preferred stock will be entitled to receive, on a pari passu basis, and in preference of any payment or distribution to holders of the Series B preferred stock and common stock, an amount per share equal to $1,000 per share plus any accrued and unpaid dividends.

Convertible Notes and Accrued Interest

The table below presents outstanding convertible notes and accrued interest as of August 31, 2025 and May 31, 2025:

​

​

Reconciliation of changes to the outstanding balance of convertible notes, including accrued interest, were as follows:

​

​

April 2, 2021 & April 23, 2021 Notes

Key terms of the outstanding convertible notes (the “Notes”) are as follows:

​

​

In addition to standard anti-dilution adjustments, the conversion price of the Notes is subject to full-ratchet anti-dilution protection, pursuant to which the conversion price will be automatically reduced to equal the effective price per share in any new offering by the Company of equity securities that have registration rights, are registered, or become registered under the Securities Act of 1933, as amended (the “Securities Act”). The Notes provide for liquidated damages upon failure to deliver common stock within specified timeframes and require the Company to maintain a share reservation of 6.0 million shares of common stock for each Note.

During the three months ended August 31, 2025, in satisfaction of the required monthly payments, the Company and April 23, 2021 Noteholder entered into exchange agreements, pursuant to which the April 23, 2021 Note was partitioned into new notes (the “Partitioned Notes”) with an aggregate principal amount of approximately $2.3 million, which was exchanged concurrently with the issuance of shares of common stock of equal value, amounting to approximately 7.5 million shares of common stock. The monthly payments were applied to accrued interest on convertible notes. The outstanding balance of the April 23, 2021 Note was reduced by the Partitioned Notes to a total amount of $35.4 million.

As of the filing date of this report, the holders of the Notes waived all provisions that, based on the occurrence of various events through that date, could have triggered the imposition of a default interest rate, a downward adjustment of the conversion price, or specified other provisions relating to default, breach or imposition of a penalty. Accordingly, the Company was not in default under the Notes on the filing date of this report.