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Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington , D.C. 20549 ( Mark One ) ANNUAL REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31 , 2020 OR TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 ( d ) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 1-6003 Delaware ( State or other jurisdiction of incorporation or organization ) FORM 10 - K Securities registered pursuant to Section 12 ( b ) of the Act : Title of each class Common Stock , par value $ 1.00 per share FEDERAL SIGNAL CORPORATION ( Exact name of registrant as specified in its charter ) Large accelerated filer Non - accelerated filer FEDERAL SIGNAL ✓ 1415 West 22nd Street , Oak Brook , Illinois ( Address of principal executive offices ) 60523 ( Zip Code ) ( 630 ) 954-2000 ( Registrant's telephone number , including area code ) Trading Symbol ( s ) FSS ( I.R.S. Employer Identification No. ) Securities registered pursuant to Section 12 ( g ) of the Act : None Indicate by check mark if the registrant is a well - known seasoned issuer , as defined in Rule 405 of the Securities Act . Yes Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15 ( d ) of the Act . Yes Indicate by check mark whether the registrant ( 1 ) has filed all reports required to be filed by Section 13 or 15 ( d ) of the Securities Exchange Act of 1934 during the preceding 12 months ( or for such shorter period that the registrant was required to file such reports ) , and ( 2 ) has been subject to such filing requirements for the past 90 days . Yes ✔ No No ✔ 36-1063330 Name of each exchange on which registered New York Stock Exchange Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S - T ( § 232.405 of this chapter ) during the preceding 12 months ( or shorter period that the registrant was required to submit such files ) . Yes No Accelerated filer Smaller reporting company Indicate by check mark whether the registrant is a large accelerated filer , an accelerated filer , a non - accelerated filer , a smaller reporting company , or an emerging growth company . See the definitions of " large accelerated filer , " " accelerated filer , " " smaller reporting company , " and " emerging growth company " in Rule 12b - 2 of the Exchange Act . No 00 Emerging growth company | If an emerging growth company , indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13 ( a ) of the Exchange Act . Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404 ( b ) of the Sarbanes - Oxley Act ( 15 U.S.C. 7262 ( b ) ) by the registered public accounting firm that prepared or issued its audit report . Indicate by check mark whether the registrant is a shell company ( as defined in Rule 12b - 2 of the Act ) . Yes No ✔ As of June 30 , 2020 , the aggregate market value of voting stock held by non - affiliates was $ 1,763,701,955 . For purposes of the foregoing calculation only , executive officers and directors of the registrant have been deemed to be affiliates . As of January 31 , 2021 , the number of shares outstanding of the registrant's common stock was 60,538,158 . Documents Incorporated By Reference Portions of the registrant's definitive proxy statement for the 2021 Annual Meeting of Stockholders are incorporated by reference in Part III .