FSS: Company disclosure

Item 7.01 Regulation FD Disclosure. On May 20, 2026, Federal Signal Corporation (the “Company”) posted presentation materials to its website, which may be used in conversations with investors and analysts. The text of the presentation materials is furnished herewith as Exhibit 99.1 and incorporated by reference into this Item 7.01. The information in Item 7.01 of this Current Report on Form 8-K, including Exhibit 99.1, is being furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities under that Section and shall not be deemed to be incorporated by reference into any filing of the Company under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Item 9.01 Financial Statements and Exhibits. (d) Exhibits 99.1 Investor Presentation materials dated May 2026 104 Cover Page Interactive Data File (embedded within the Inline XBRL Document) 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 hereunto duly authorized. FEDERAL SIGNAL CORPORATION Dated: May 20, 2026 By: /s/ Ian A. Hudson Ian A. Hudson, Senior Vice President and Chief Financial Officer