8. Equity Incentive Plan – Stock-Based Compensation Expense

2021 Omnibus Equity Incentive Plan

On July 19, 2021, the Company’s Board of Directors (the “Board”) adopted the RenovoRx, Inc. 2021 Omnibus Equity Incentive Plan (the “2021 Plan”). The 2021 Plan, which became effective immediately prior to the closing of the IPO, initially reserved 2,185,832 shares of common stock, which included 10,832 shares of common shares reserved but unissued under the Amended and Restated 2013 Equity Incentive Plan (the “2013 Plan”). The Company’s 2013 Plan was terminated immediately prior to the closing of the IPO; however, shares subject to awards granted under the 2013 Plan continued to be governed by the 2013 Plan. In accordance with the terms of the 2021 Plan, on January 1, 2026, the number of shares reserved and available for issuance increased by 1,830,696 shares.

The Company accounts for stock-based compensation to employees, consultants and non-employee directors in accordance with ASC Topic 718, Compensation – Stock Compensation. The Company estimates the fair value of stock option awards using the Black-Scholes option pricing model on the date of grant using the assumptions in the table below. Stock options granted to employees and consultants generally vest over four years and have a term of ten years. Stock-based compensation expense for stock options is recognized as expense over the requisite service period, which is the vesting period. As the Company has not paid dividends since inception, nor does it expect to pay any dividends for the foreseeable future, the expected dividend yield assumption is zero. The expected volatility is estimated based on the historical stock volatility of the Company’s own common stock over a period equal to the

expected term of the options including by taking the average historic price volatility for industry peers, consisting of several public companies in the Company’s industry that are either similar in size, stage, or financial leverage, over a period equivalent to the expected term of the awards. The risk-free rate of the stock options is based on the U.S. Treasury rate in effect at the time of grant for the expected term of the stock options.

As of March 31, 2026, there was $1.8 million of unrecognized stock-based compensation expense related to options granted but not yet amortized, which will be recognized over a weighted-average period of approximately 2.36 years.

For the three months ended March 31, 2026, and 2025, the Company utilized the Black-Scholes option-pricing model for estimating the fair value of the stock option granted. The Company estimated the fair value of each option grant on the grant date using the Black-Scholes option pricing model with the following weighted-average assumptions:

Restricted Stock Units and Restricted Stock Awards Issued for Services

Restricted stock units (“RSU”) are valued based on the closing price of the Company’s common stock on the date of the grant. The fair value of RSU is recognized and amortized on a straight-line basis over the requisite service period of the award.

A summary of the restricted stock units activity for the three months ended March 31, 2026 is as follows:

During the three months ended March 31, 2026, and 2025, the Company recognized $317,000 and $288,000, respectively, in stock-based compensation expense from stock option grants and restricted stock awards. The compensation expense is allocated on a departmental basis, based on the classification of the option holder. No income tax benefits have been recognized in the statements of operations and comprehensive loss for stock-based compensation arrangements.