FUEL TECH, INC. 10-Q

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds None 23 Table of Contents Item 6. Exhibits a. Exhibits (all filed herewith) 31.1 Certification of CEO pursuant to Section 302 of Sarbanes-Oxley Act of 2002 31.2 Certification of principal financial officer pursuant to Section 302 of Sarbanes-Oxley Act of 2002 32 Certification of CEO and principal financial officer pursuant to Section 906 of Sarbanes-Oxley Act of 2002 101.1 INSXBRL Instance Document 101.2 SCHXBRL Taxonomy Extension Schema Document 101.3 CALXBRL Taxonomy Extension Calculation Linkbase Document 101.4 DEFXBRL Taxonomy Extension Definition Linkbase Document 101.5 LABXBRL Taxonomy Extension Label Linkbase Document 101.6 PREXBRL Taxonomy Extension Prevention Linkbase Document 24 Table of Contents FUEL TECH, INC. Signatures Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Date: 05/12/2021 By: /s/ Vincent J. Arnone Vincent J. Arnone President and Chief Executive Officer (Principal Executive Officer) Date: 05/12/2021 By: /s/ Ellen T. Albrecht Ellen T. Albrecht Acting Treasurer and Controller (Principal Financial Officer) 25