Fuel Tech, Inc. Corporate Presentation

On September 14, 2026, Fuel Tech, Inc. posted an updated corporate presentation on its website. This report is filed under Item 7.01 Regulation FD Disclosure and is not deemed to be filed for Section 18 of the Securities and Exchange Act of 1934. The presentation, dated September 14, 2026, is attached as Exhibit 99.1. The filing also includes the Cover Page Interactive Data File. The report is signed by Bradley W. Johnson, Vice President, General Counsel and Secretary, on September 18, 2026.