Note 11 — Warrants

At December 31, 2023 and 2022, there were 786,420 warrants outstanding at a weighted average exercise price of $5.19 and 253,828 pre-funded warrants outstanding at a weighted average exercise price of $0.001.

All warrants were exercisable at December 31, 2023 although warrants may generally be exercised only to the extent that the total number of shares of common stock then beneficially owned by these shareholders does not exceed 4.99% (or, at the investor’s election, 9.99%) of the outstanding shares of the Company’s stock.

The weighted average remaining life, excluding the 253,828 pre-funded warrants with no expiration date, of the outstanding warrants is 1.2 years.

The estimated aggregate pre-tax intrinsic value (the difference between the Company’s stock price on the last day of the year ended December 31, 2023 and the exercise prices, multiplied by the number of in-the-money warrants) is $4.4 million.