NOTE 14 – STOCKHOLDERS’ EQUITY  

Series B Convertible Preferred Stock

The following summary of certain terms and provisions of our Series B Convertible Preferred Stock (the “Series B Convertible Preferred Stock”) is subject to, and qualified in its entirety by reference to, the terms and provisions set forth in our certificate of designation of preferences, rights and limitations of Series B Convertible Preferred Stock (the “Series B Convertible Preferred Certificate of Designation”) as previously filed. Subject to the limitations prescribed by our articles of incorporation, our board of directors is authorized to establish the number of shares constituting each series of preferred stock and to fix the designations, powers, preferences, and rights of the shares of each of those series and the qualifications, limitations and restrictions of each of those series, all without any further vote or action by our stockholders. Our board of directors designated 15,000 of the 10,000,000 authorized shares of preferred stock as Series B Convertible Preferred Stock with a stated value of $1,000 per share. The shares of Series B Convertible Preferred Stock were validly issued, fully paid and non-assessable.

Each share of Series B Convertible Preferred Stock was convertible at any time at the holder’s option into a number of shares of common stock equal to $1,000 divided by the conversion price of $7.00 per share. Notwithstanding the foregoing, we could not effect any conversion of Series B Convertible Preferred Stock, with certain exceptions, to the extent that, after giving effect to an attempted conversion, the holder of shares of Series B Convertible Preferred Stock (together with such holder’s affiliates, and any persons acting as a group together with such holder or any of such holder’s affiliates) would beneficially own a number of shares of our common stock in excess of 4.99% (or, at the election of the purchaser, 9.99%) of the shares of our common stock then outstanding after giving effect to such conversion. The Series B Convertible Preferred Certificate of Designation does not prohibit the Company from waiving this limitation. Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary, the holders would be entitled to participate on an as-converted-to-common stock basis (without giving effect to the Beneficial Ownership Limitation) with holders of the common stock in any distribution of assets of the Company to the holders of the common stock. As of March 31, 2026 and December 31, 2025, respectively, there are zero 0 and zero 0 shares of Series B Convertible Preferred Stock issued and outstanding.

Series C Convertible Preferred Stock

The Company’s Board of Directors designated 5,000 shares as the Series C Convertible Preferred Stock (the “Series C Convertible Preferred Stock”). Each share of the Series C Convertible Preferred Stock had a stated value of $1,000. The holders of the Series C Convertible Preferred Stock, the holders of the common stock and the holders of any other class or series of shares entitled to vote with the common stock shall vote together as one class on all matters submitted to a vote of shareholders of the Company. Each share of Series C Convertible Preferred Stock had 172 votes (subject to adjustment); provided that in no event may a holder of Series C Convertible Preferred Stock be entitled to vote a number of shares in excess of such holder’s Beneficial Ownership Limitation (as defined in the Certificate of Designation and as described below). Each share of Series C Convertible Preferred Stock was convertible, at any time and from time to time, at the option of the holder, into that number of shares of common stock (subject to the Beneficial Ownership Limitation) determined by dividing the stated value of such share ($1,000) by the conversion price, which is $5.50 (subject to adjustment). The Company shall not effect any conversion of the Series C Convertible Preferred Stock, and a holder shall not have the right to convert any portion of the Series C Convertible Preferred Stock, to the extent that after giving effect to the conversion sought by the holder such holder (together with such holder’s Attribution Parties (as defined in the Certificate of Designation)) would beneficially own more than 4.99% (or upon election by a holder, 19.99%) of the number of shares of common stock outstanding immediately after giving effect to the issuance of shares of common stock issuable upon such conversion (the “Beneficial Ownership Limitation”). All holders of the Series C Preferred Stock elected the 19.99% Beneficial Ownership Limitation. As of March 31, 2026 and December 31, 2025, respectively, there are zero 0 and zero 0 shares of Series C Convertible Preferred Stock issued and outstanding.

Series D Convertible Preferred Stock

On September 28, 2022, the Company amended its articles of incorporation to designate 4,000 shares as the Series D Convertible Preferred Stock (the “Series D Convertible Preferred Stock”). Each share of the Series D Convertible Preferred Stock has a stated value of $1,000. The holders of the Series D Convertible Preferred Stock, the holders of the common stock and the holders of any other class or series of shares entitled to vote with the common stock shall vote together as one class on all matters submitted to a vote of shareholders of the Company. Each share of Series D Convertible Preferred Stock has 333 votes (subject to standard anti-dilution adjustment); provided that in no event may a holder of Series D Convertible Preferred Stock be entitled to vote a number of shares in excess of such holder’s Beneficial Ownership Limitation (as defined in the Certificate of Designation and as described below). Each share of Series D Convertible Preferred Stock is convertible, at any time and from time to time, at the option of the holder, into that number of shares of common stock (subject to the Beneficial Ownership Limitation) determined by dividing the stated value of such share ($1,000) by the conversion price, which is $3.00 (subject to adjustment). The Company shall not effect any conversion of the Series D Convertible Preferred Stock, and a holder shall not have the right to convert any portion of the Series D Convertible Preferred Stock, to the extent that after giving effect to the conversion sought by the holder such holder (together with such holder’s Attribution Parties (as defined in the Certificate of Designation)) would beneficially own more than 4.99% (or upon election by a holder, 19.99%) of the number of shares of common stock outstanding immediately after giving effect to the issuance of shares of common stock issuable upon such conversion (the “Beneficial Ownership Limitation”). All but one of the holders of the Series D Preferred Stock elected the 19.99% Beneficial Ownership Limitation. The Company shall reserve and keep available out of its authorized and unissued Common Stock, solely for the issuance upon the conversion of the Series D Convertible Preferred Stock, such a number of shares of Common Stock as shall from time to time be issuable upon the conversion of all of the shares of the Series D Convertible Preferred Stock then outstanding. Additionally, the Series D Convertible Preferred Stock does not have the right to dividends and in the event of an involuntary liquidation, the Series D shares shall be treated as a pro rata equivalent of common stock outstanding at the date of the liquidation event and have no liquidation preference.

On September 30, 2022, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with certain existing investors in the Company (the “Purchasers”). Pursuant to the Purchase Agreement, the Purchasers purchased 999 shares of the newly authorized Series D Convertible Preferred Stock, and the Company received proceeds of $999,000. The Purchase Agreement contains customary representations, warranties, agreements and indemnification rights and obligations of the parties. On October 29, 2022, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with a certain existing investor in the Company (the “Purchaser”). Pursuant to the Purchase Agreement, the Purchaser purchased 300 shares of the newly authorized Series D Convertible Preferred Stock, and the Company received proceeds of $300,000. The Purchase Agreement contains customary representations, warranties, agreements and indemnification rights and obligations of the parties.

At the Annual Meeting on May 16, 2023, the stockholders approved the convertibility of the Series D Preferred Stock into common stock.

On March 22, 2024, March 28, 2024, and April 3, 2024, the Company entered into Securities Purchase Agreements (the “Purchase Agreements”) with certain existing and other accredited investors (the “2024 Purchasers”). Pursuant to the Purchase Agreements, the 2024 Purchasers purchased an aggregate of 870 shares of Series D Preferred Stock, at a price of $1,000 per share, and the Company received proceeds of $870,000.

In connection with such Purchase Agreements, the Company entered into Registration Rights Agreements and filed registration statements with the SEC covering the resale by the Purchasers of the shares of common stock into which the shares of Series D Convertible Preferred Stock are convertible. The Registration Rights Agreements contain customary representations, warranties, agreements and indemnification rights and obligations of the parties.

The Registration Rights Agreements contain provisions for liquidated damages equal to 1% multiplied by the aggregate subscription amount paid, paid each month, in the event certain deadlines are missed.

In April, May, July and October of 2024, 870 outstanding shares of Series D Convertible Preferred Stock were converted into 290,002 shares of common stock. In February of 2025, 300 outstanding shares of Series D Convertible Preferred Stock were converted into 100,000 shares of common stock. As of March 31, 2026, and December 31, 2025, there were 999 and 999 shares of Series D Convertible Preferred Stock issued and outstanding, respectively.

Series E Convertible Preferred Stock

The Company’s Board of Directors has designated 30,000 shares as the Series E Convertible Preferred Stock (the “Series E Convertible Preferred Stock”). Each share of the Series E Convertible Preferred Stock has a stated value of $1,000. The holders of the Series E Convertible Preferred Stock, the holders of the common stock and the holders of any other class or series of shares entitled to vote with the common stock shall vote as one class on all matters submitted to a vote of shareholders of the Company. Each share of Series E Convertible Preferred Stock has 333 votes (subject to adjustment); provided that in no event may a holder of Series E Convertible Preferred Stock be entitled to vote a number of shares in excess of such holder’s Beneficial Ownership Limitation. Each share of Series E Convertible Preferred Stock is convertible at any time and from time to time, at the option of the holder, into that number of shares of common stock (subject to the Beneficial Ownership Limitation) determined by dividing the stated value of such share ($1,000) by the conversion price, which was $3.00 (subject to adjustment) (see adjustment below to $2.61). The Company shall not effect any conversion of the Series E Convertible Preferred Stock, and the holder shall not have the right to convert any portion of the Series E Convertible Preferred Stock, to the extent that after giving effect to the conversion sought by the holder such holder (together with such holder’s Attribution Parties (as defined in the Certificate of Designation)) would beneficially own more than 4.99% (or upon election by a holder, 19.99%) of the number of shares of common stock outstanding immediately after giving effect to the issuance of shares of common stock issuable upon such conversion (the “Beneficial Ownership Limitation”). All but one of the holders of the Series E Preferred Stock elected the 19.99% Beneficial Ownership Limitation.

The Company on March 27, 2023 entered into a Securities Purchase Agreement (the “Purchase Agreement”) with existing investors in the Company (the “Purchasers”). Pursuant to the Purchase Agreement, the Purchasers purchased 4,000 shares of a newly authorized Series E Convertible Preferred Stock at a price of $1,000 per share, and the Company received proceeds of $4,000,000. The Purchase Agreement contains customary representations, warranties, agreements and indemnification rights and obligations of the parties.

The existing investors’ Purchase Agreement also provided that the Company would not, with certain exceptions, sell or issue common stock or Common Stock Equivalents (as defined in the Purchase Agreement) on or prior to December 31, 2023 that entitled any person to acquire shares of common stock at an effective price per share less than the then conversion price of the Series E Convertible Preferred Stock without the consent of the Purchasers.

On November 9, 2023, the Company entered into a Securities Purchase Agreement (the “November Purchase Agreement”) with existing investors in the Company (the “Purchasers”). Pursuant to the Purchase Agreement, the Purchasers purchased 2,500 shares of Series E Convertible Preferred Stock, at a price of $1,000 per share, and the Company received proceeds of $2,500,000.

The November Purchase Agreement also provided that the Company would not, with certain exceptions, sell or issue common stock or Common Stock Equivalents (as defined in the November Purchase Agreement) on or prior to June 30, 2024 that entitled any person to acquire shares of common stock at an effective price per share less than the then conversion price of the Series E Convertible Preferred Stock (which was $3.00 per share) without the consent of the Purchasers. If the Company sold shares less than the conversion price, with the consent of Purchasers, then the Series E conversion price would be amended to that lower share price. This provision had not been triggered as of June 30, 2024.

The Purchasers under the November Purchase Agreement also were the holders of the Company’s Series F Convertible Preferred Stock issued on August 1, 2023. The purchase agreement relating to the shares of Series F Convertible Preferred Stock required the consent of the holders in the event the Company were to issue common stock or rights to acquire common stock prior to December 31, 2023 at an effective price per share less than the then conversion price of the Series F Convertible Preferred Stock, which was $6.20 per share. As a result, on November 10, 2023 the Company and the holders of the Series F Convertible Preferred Stock entered into Exchange Agreements pursuant to which the holders of Series F Convertible Preferred Stock exchanged their 5,000 shares of Series F Convertible Preferred Stock for an equal number of shares of Series E Convertible Preferred Stock. As a result of the November Purchase Agreement and the Exchange Agreements, the Company issued a total of 7,500 shares of Series E Convertible Preferred Stock and the 5,000 shares of Series F Convertible Preferred Stock were cancelled.

On March 22, 2024 and March 28, 2024, the Company entered into Securities Purchase Agreements (the “Purchase Agreements”) with certain existing and other accredited investors (the “2024 Purchasers”). Pursuant to the Purchase Agreements, the 2024 Purchasers purchased an aggregate of 2,125 shares of Series E Convertible Preferred Stock, at a price in each case of $1,000 per share, and the Company received proceeds of $2,125,002. Those purchase agreements had similar price protections as the November Purchase Agreement but extended the price protection date to December 31, 2024, for all Series E holders.

In connection with such Purchase Agreements, the Company also entered into Registration Rights Agreements with the Purchasers. Pursuant to the Registration Rights Agreements, the Company filed with the SEC registration statements covering the resale by the Purchasers of the shares of common stock into which the shares of Series E Convertible Preferred Stock are convertible.

The Registration Rights Agreements contain customary representations, warranties, agreements and indemnification rights and obligations of the parties. The Registration Rights Agreements contain provisions for liquidated damages equal to 1% multiplied by the aggregate subscription amount paid, paid each month, in the event certain deadlines are missed.

On September 19, 2024, the conversion rate of the Series E Convertible Preferred Stock was lowered to $2.61 from $3.00 per share based on the down round protection provision triggered by the warrants induced exercise price of $2.61 per share. This will lead to the issuance of an additional 678,640 shares of common stock upon the conversion of the preferred shares.

In October of 2024, 125 outstanding shares of the Series E Convertible Preferred Stock were converted into 47,892 shares of common stock.

On May 28, 2025, a shareholder converted 1,000 shares of Series E Convertible Preferred Stock with a stated value of $1,000,000 with a conversion price of $2.61 per common share resulting in the issuance of 383,143 shares of the Company’s common stock.

As of March 31, 2026, and December 31, 2025, respectively, there were 12,500 and 12,500 shares of Series E Convertible Preferred Stock issued and outstanding.

Series F Convertible Preferred Stock

The Company's Board of Directors designated 5,000 shares as the Series F Convertible Preferred Stock (the “Series F Convertible Preferred Stock”). Each share of Series F Preferred Stock was convertible, at any time and from time to time, at the option of the holder, into that number of shares of common stock (subject to the beneficial ownership limitation described below) determined by dividing the stated value of such share ($1,000) by the conversion price, which is $6.20 (subject to adjustment) which equates to 161 common shares for each converted Series F preferred share. The Company, however, shall not effect any conversion of the Series F Convertible Preferred Stock, and the holder shall not have the right to convert any portion of the Series F Convertible Preferred Stock, to the extent that after giving effect to the conversion sought by the holder such holder (together with such holder’s Attribution Parties (as defined in the Certificate of Designation)) would beneficially own more than 4.99% (or upon election by a holder, 19.99%) of the number of shares of common stock outstanding immediately after giving effect to the issuance of shares of common stock issuable upon such conversion. The purchasers of the Series F Convertible Preferred Stock elected that their ownership limitation would be 19.99%. 

The holders of the Series F Convertible Preferred Stock, the holders of the common stock and the holders of any other class or series of shares entitled to vote with the common stock shall vote together as one class on all matters submitted to a vote of shareholders of the Company. Each share of Series F Convertible Preferred Stock had 161 votes (subject to adjustment); provided that in no event may a holder of Series F Preferred Stock be entitled to vote a number of shares in excess of such holder’s ownership limitation.

On August 2, 2023, the Company entered into a Securities Purchase Agreement (the “Purchase Agreement”) with existing, accredited investors in the Company (the “Purchasers”). Pursuant to the Purchase Agreement, the Purchasers purchased 5,000 shares of a newly authorized Series F Convertible Preferred Stock, and the Company received proceeds of $5,000,000. The Purchase Agreement contains customary representations, warranties, agreements and indemnification rights and obligations of the parties. 

The Company also agreed that it would not, with certain exceptions, sell or issue common stock or Common Stock Equivalents (as defined in the Purchase Agreement relating to the Series F Preferred Stock) on or prior to December 31, 2023 that entitled any person to acquire shares of common stock at an effective price per share less than the then conversion price of the Series F Preferred Stock without the consent of the holders. As a result of that agreement, upon the issuance of 2,500 shares of Series E Preferred Stock (which had a conversion price of $3.00 per share) on November 10, 2023, the holders exchanged their 5,000 shares of Series F Preferred Stock for 5,000 shares of Series E Preferred Stock. All of the shares of Series F Preferred Stock thereupon were cancelled with zero shares now outstanding. 

As of March 31, 2026, and December 31, 2026, respectively, there were zero 0 and zero 0 shares of Series F Convertible Preferred Stock issued and outstanding.

Common stock issued

2026 Transactions

On January 1, 2026, the Company issued restricted stock awards to an officer for a total of 150,000 shares of restricted stock with 3-year cliff vesting with an aggregate grant-date fair value of $1,687,504 based on a $11.25 price per share.

On January 1, 2026, the Company issued restricted stock awards to eight employees for a total of 145,000 shares of restricted stock with 25% vesting on January 1, 2027, 25% vesting on January 1, 2028 and 50% vesting on January 1, 2029 with an aggregate grant-date fair value of $1,631,254 based on a $11.25 price per share.

On January 15, 2026, a former employee exercised options to purchase 2,500 shares generating total gross proceeds of $19,009, incurring stock issuance cost of $101, payroll tax cost of $2,883, and yielding net proceeds of $16,025. The exercise were made pursuant to the Company’s 2021 Equity Incentive Plan and were conducted in accordance with the applicable terms of the plan and the individual award agreements.

On February 1, 2026, the Company issued restricted stock awards to two employees for a total of 125,000 shares of restricted stock with 3-year cliff vesting with an aggregate grant-date fair value of $1,175,008 based on a $9.40 price per share.

On March 2, 2026, the Company issued 8,666,666 shares of its common stock under a public offering priced at $7.50 per share, resulting in net proceeds of approximately $60.3 million net of offering costs of $4.7 million. In connection with the offering on March 2, 2026, the underwriters were issued 433,334 warrants. See warrants disclosure below.

On March 3, 2026, a former employee completed a cashless exercise of stock options for 5,556 shares of the Company’s common stock.

On March 31, 2026, the Company issued 14,193 shares of common stock for payment of board fees to four directors valued at $95,000 for services to the board which was expensed during the three months ended March 31, 2026. The volume-weighted average price (VWAP) on the grant date used to value the services is $6.69 per share.

2025 Transactions

Effective January 1, 2025, the Company’s executive leadership team was granted a total of 1,841,898 shares of restricted stock, subject to a three-year cliff vesting schedule, with an aggregate grant-date fair value of $11,014,544 based on a $5.98 price per share.

On February 5, 2025, a holder of our Series D Convertible Preferred Stock converted 300 shares of Series D Convertible Preferred Stock into 100,000 shares of Common Stock.

Effective March 26, 2025, the Company issued a restricted stock award to an employee for a total of 100,000 shares of restricted stock with 3-year cliff vesting with an aggregate grant-date fair value of $604,000 based on a $6.04 price per share.

During the three months ended March 31, 2025, the Company issued an aggregate of 633,683 shares of common stock at a weighted average price of $6.24 per share through its At-The-Market (ATM) offering program, generating total gross proceeds of $3,954,940, incurring stock issuance costs of $137,851 and yielding net proceeds of $3,817,089.

On March 31, 2025, the Company issued 9,360 shares of common stock for payment of board fees to four directors valued at $50,000 for services to the board which was expensed during the three months ended March 31, 2025. The volume-weighted average price (VWAP) on the grant date used to value the services is $5.34 per share.

During the three months ended March 31, 2025, certain employees exercised stock options to acquire a total of 27,712 shares of the Company’s common stock, generating total gross proceeds of $107,925, incurring stock issuance cost of $375 and yielding net proceeds of $107,550. The exercises were made pursuant to the Company’s 2016 and 2021 Equity Incentive Plans and were conducted in accordance with the applicable terms of the plans and the individual award agreements.

During the three months ended March 31, 2025, the Company issued 10,000 shares of restricted common stock to each of Mr. Ehrman and Mr. Mavrommatis, directors of the Company, subject to a one-year cliff resting period. The shares had an aggregate grant-date fair value of $119,600, based on a $5.98 price per share.

Employee Stock Purchase Plan

In the fourth quarter of 2022, the board of directors adopted an Employee Stock Purchase Plan (“ESPP”) which was effective as of January 1, 2023 with a term of 10 years. The ESPP allows eligible employees to purchase shares of the Company's common stock at a discounted price, through payroll deductions from a minimum of 1% and up to 25% of their eligible compensation up to a maximum of $25,000 or the IRS allowable limit per calendar year. The Company’s Chief Financial Officer administers the ESPP in conjunction with approvals from the Company’s Compensation Committee, including with respect to the frequency and duration of offering periods, the maximum number of shares that an eligible employee may purchase during an offering period, and, subject to certain limitations set forth in the ESPP, the per-share purchase price. Currently, the maximum number of shares that can be purchased by an eligible employee under the ESPP is 10,000 shares per offering period and there are two six-month offering periods that begin in the first and third quarters of each fiscal year. The purchase price for one share of Common Stock under the ESPP is currently equal to 85% of the fair market value of one share of Common Stock on the first trading day of the offering period or the purchase date, whichever is lower (look-back feature). Although not required by the ESPP, all payroll deductions received or held by the Company under the ESPP are segregated and deemed as “restricted cash” until the completion of the offering period and redemption of the applicable shares and those withheld amounts are recorded as liabilities. The maximum aggregate number of shares of the Common Stock that may be issued under the ESPP is 1,000,000 shares.

Under ASC 718-50 “Employee Share Purchase Plans” the plan is considered a compensatory plan and the compensation for each six-month offering period is computed based upon the grant date fair value of the estimated shares to be purchased based on the estimated payroll deduction withholdings. The grant date fair value was computed as the sum of (a) 15% purchase discount off of the grant date quoted trading price of the Company’s common stock and (b) the fair value of the look-back feature of the Company’s common stock on the grant date which consists of a call option on 85% of a share of common stock and a put option on 15% of a share of common stock.

As of March 31, 2026, the Company has an accrued liability of $33,538 included in accrued expenses of employee contributions for the ESPP which may convert to shares of common stock upon the close of the offering period open from January 1, 2026 to June 30, 2026. The liability is offset by restricted cash held by the Company in the same amount for employee contributions which the Company expects to convert to common stock upon closure of the offering period at June 30, 2026. Additionally, the Company recorded a stock-based expense associated with the ESPP for the three months ended March 31, 2026 of $16,318.

The Company computed the fair value of the look-back feature call and put options for January 1, 2026 to March 31, 2026 using a Black Scholes option pricing model using the following assumptions:

During the offer period, the Company records stock-based compensation pro rata as an expense and a credit to additional paid-in capital. The following table discloses relevant information for the ESPP at March 31, 2026 and for three months then ended.

Stock-Based Compensation

Stock-based compensation expense recognized under ASC 718-10 for the three months ended March 31, 2026 and 2025, was $20,000 and $22,030, respectively, for stock options granted to employees and directors. This expense is included in general and administration expenses in the consolidated statements of operations. Stock-based compensation expense recognized during the periods is based on the grant date fair value of the portion of share-based payment awards that is ultimately expected to vest during the period. At March 31, 2026, the total compensation cost for stock options that was not yet recognized was $52,113. This cost will be recognized over the remaining vesting term of the options ranging from 3 months to 2.8 years.

Stock-based compensation expense recognized under ASC 718-10 for the three months ended March 31, 2026 and 2025, was $1,343,011 and $951,973, respectively, for shares of restricted stock granted to employees. During the three months ended March 31, 2026, the Company granted a total of 420,000 shares of restricted stock with an aggregate grant-date fair value of $4,493,766, computed as 295,000 shares at $11.25 per share and 125,000 shares at $9.40 per share. This expense is included in general and administration expenses in the consolidated statements of operations. Stock-based compensation expense recognized during the periods is based on the grant-date fair value of the restricted stock units that are ultimately expected to vest. At March 31, 2026, the total compensation cost for restricted stock not yet recognized was $11,917,154. This cost will be recognized over the remaining vesting term of the restricted stock ranging from 2 to 3 years.

Treasury Stock

At March 31, 2026, and December 31, 2025, the Company held 1,324 shares of Common Stock at an aggregate value of $157,452 of treasury stock.