Note 7 - Warrants

12 Months Ended

Dec. 31, 2023

Notes to Financial Statements

Warrants Disclosure [Text Block]

7. WARRANTS

On February 11, 2021, Fuel Tech entered into a securities purchase agreement to issue and sell, in a private placement, 5,000,000 shares of common stock and 2,500,000 warrants exercisable for a total of 2,500,000 shares of common stock with an exercise price of $5.10 per Warrant Share, at a purchase price of $5.1625 per Share and associated warrant. The Warrants expire on the five and one-half year anniversary of the effective date of the registration statement registering the Warrant Shares for resale.  In addition, the Company issued to the placement agent Warrants to purchase up to 350,000 shares of common stock.  The Placement Agent Warrants are exercisable at an exercise price of $6.45 per share of common stock and expire on the five and one-half year anniversary of the effective date of the registration statement registering the Shares and the Warrant Shares for resale.

The issuance of warrants to purchase shares of the Company's common stock are summarized as follows:

	Shares
Outstanding as of December 31, 2022		2,850,000
Granted		—
Exercised		—
Outstanding as of December 31, 2023		2,850,000

The following table summarizes information about warrants outstanding and exercisable at December 31, 2023:

		Number		Weighted-Average
		Outstanding/		Remaining Life		Weighted-Average
Range of Exercise Price		Exercisable		in Years		Exercise Price
$	5.10		2,500,000		2.62	$	5.10
$	6.45		350,000		2.62	$	6.45
			2,850,000