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.

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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, 2024 and May 31, 2024:

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

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April 2, 2021 & April 23, 2021 Notes

Key terms of the outstanding convertible notes are as follows:

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In addition to standard anti-dilution adjustments, the conversion price of the April 2, 2021 Note and April 23, 2021 Note 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 April 2, 2021 Note and April 23, 2021 Note 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, 2024, in satisfaction of redemptions, 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 $1.0 million, which was exchanged concurrently with the issuance of approximately 8.8 million shares of common stock. The outstanding balance of the April 23, 2021 Note was reduced by the Partitioned Notes to a principal amount of $26.4 million. The Company accounted for the Partitioned Notes and the exchange settlements as induced conversions, and, accordingly, recorded a non-cash loss on convertible debt induced conversion of $1.2 million for the three months ended August 31, 2024.

As of September 30, 2024, the holders of the April 2, 2021 and April 23, 2021 Notes waived all provisions in the convertible notes 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 September 30, 2024.

Placement Agent Notes

During the period April through June 2023, the Company entered into securities purchase agreements pursuant to which the Company issued secured promissory notes bearing interest at a rate of 6.0% and with an 18-month term to accredited investors through a placement agent (“Placement Agent Notes”) for a total principal amount of approximately $2.3 million. The Placement Agent Notes were secured by the net cash recovery, if any, by the Company in its dispute with Amarex and provided the investors with a right to convert the unpaid principal and accrued but unpaid interest into shares of common stock upon the occurrence of an event of default. The Placement Agent Notes had maturity dates during the fiscal year ending May 31, 2025.

In connection with the note issuances, the Company issued warrants to investors to purchase approximately 1.3 million shares of common stock with a three-year term and an exercise price of $0.50 per share. The Company also issued warrants to purchase approximately 0.4 million shares of common stock to the placement agent with a ten-year term and an exercise price of $0.26 per share.

During June 2023, an amendment was entered into with the investors of the Placement Agent Notes, which stated that the principal amount and accrued but unpaid interest on the notes would be converted into shares of common stock and warrants as of the first closing of a subsequent private placement of common stock and warrants through a placement agent. The deemed purchase price of a unit of one share plus one warrant was fixed at 90% of the lower of the intraday volume weighted average price (“VWAP”) on the date of the first closing and last closing of the private

placement, while the exercise price of the warrants was set at $0.306 per share, compared to $0.50 per share in the original private placement. The amendment also allowed investors to retain an interest in the Amarex settlement after conversion.

In July 2023, the first closing of the subsequent private placement of common stock and warrants through a placement agent occurred. Therefore, the Placement Agent Notes were converted into units with the same pricing as the private placement described in Note 6, Private Placements of Common Stock and Warrants – Private placements of common stock and warrants through placement agent in the Company’s 2024 Form 10-K.

Due to the settlement with Amarex in July 2024, the Company owed approximately $0.9 million to Placement Agent Note investors, recorded as a loss on derivatives, of which approximately $0.7 million was paid in the three months ended August 31, 2024. In accordance with the prescribed accounting guidance, the Company measured fair value of liability classified warrants using fair value hierarchy included in Note 2, Summary of Significant Accounting Policies – Fair Value of Financial Instruments. The Company’s derivative liability is classified within Level 3.

Please refer to Note 5, Convertible Instruments and Accrued Interest, in the Company’s 2024 Form 10-K for additional information.