CONTACT: Vince Arnone President and CEO (630) 845-4500 Exhibit 99.1 Devin Sullivan Managing Director The Equity Group Inc. dsullivan@theequitygroup.com FOR IMMEDIATE RELEASE FUEL TECH REPORTS 2026 FIRST QUARTER FINANCIAL RESULTS WARRENVILLE, Ill., - May 5, 2026 – Fuel Tech, Inc. (NASDAQ: FTEK), a technology company using advanced engineering processes to provide emissions control systems and water treatment technologies in utility and industrial applications, today reported financial results for the first q ...