Fuel Tech (FTEK) CEO adds 10,000 shares in open-market purchase

Rhea-AI Filing Summary

FUEL TECH, INC. President and CEO Vincent J. Arnone reported an open-market purchase of 10,000 shares of common stock at a price of $1.24 per share. After this transaction, he directly owns 549,513 shares of Fuel Tech common stock.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

ARNONE VINCENT J

(Last) (First) (Middle)

27601 BELLA VISTA PARKWAY

(Street)

WARRENVILLE IL 60555

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
FUEL TECH, INC. [ FTEK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	President & CEO

3. Date of Earliest Transaction (Month/Day/Year)
03/06/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/06/2026		P		10,000	A	$1.24	549,513	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Vincent J. Arnone	03/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What insider transaction did FUEL TECH (FTEK) report on this Form 4?

FUEL TECH reported that President and CEO Vincent J. Arnone bought 10,000 shares of common stock. The transaction was an open-market purchase at $1.24 per share, increasing his directly held stake in the company’s shares.

How many FUEL TECH (FTEK) shares does Vincent J. Arnone own after this trade?

After the reported transaction, Vincent J. Arnone directly owns 549,513 shares of FUEL TECH common stock. This total reflects his holdings following the 10,000-share open-market purchase disclosed in the Form 4 filing.

Was the FUEL TECH (FTEK) CEO’s Form 4 transaction a buy or a sell?

The transaction was a buy. Vincent J. Arnone executed an open-market purchase of 10,000 FUEL TECH common shares at $1.24 per share, as indicated by transaction code “P” and the buy classification in the filing data.

What price did the FUEL TECH (FTEK) CEO pay per share in this Form 4 trade?

The CEO paid $1.24 per share for the 10,000 FUEL TECH common shares he purchased. The filing classifies this as an open-market transaction, providing insight into the exact per-share cost of the insider’s recent buy.

Is the FUEL TECH (FTEK) CEO’s ownership on this Form 4 direct or indirect?

The ownership reported in this Form 4 is direct. The filing lists the ownership code as “D,” indicating that the 549,513 shares, including the newly purchased 10,000 shares, are held directly by Vincent J. Arnone.