Document

DEFA14A 1 fss2026stockholderletter.htm DEFA14A Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the Securities

Exchange Act of 1934 (Amendment No. __)

Filed by the Registrant þ

Filed by a Party other than the Registrant ¨

Check the appropriate box:

Preliminary Proxy Statement

Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

Definitive Proxy Statement

Definitive Additional Materials

Soliciting Material Pursuant to §240.14a-12

FEDERAL SIGNAL CORPORATION

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

No fee required.

Fee paid previously with preliminary materials.

Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

On or around March 6, 2026, Federal Signal Corporation will send an outreach letter (the "Letter") to its stockholders and other interested parties. The Letter may constitute additional proxy solicitation materials by the Company, and is attached as Exhibit 99.1 to this filing and incorporated by reference herein.

SEC Form DEFA14A filed by Federal Signal Corporation