Sec Form 4 Filing - WEBER MARK @ FEDERAL SIGNAL CORP /DE/ - 2025-11-06

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person WEBER MARK 2. Issuer Name and Ticker or Trading Symbol FEDERAL SIGNAL CORP /DE/ [ FSS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) SVP & COO (Last) (First) (Middle) 1333 BUTTERFIELD ROAD, SUITE 500 3. Date of Earliest Transaction (MM/DD/YY) 11/06/2025 (Street) DOWNERS GROVE, IL60515 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 11/06/2025 M 2,546 A $ 27.8 76,420 D Common Stock 11/06/2025 S 2,546 D $ 112.5457 ( 1 ) 73,874 D Common Stock 11/06/2025 M 15,682 A $ 42.86 89,556 D Common Stock 11/06/2025 S 1,640 D $ 112.5001 ( 2 ) 87,916 D Common Stock 11/06/2025 S 14,042 D $ 111.7011 ( 3 ) 73,874 D Common Stock 11/06/2025 M 19,780 A $ 35.8 93,654 D Common Stock 11/06/2025 S 19,760 D $ 111.6109 ( 4 ) 73,894 D Common Stock 11/06/2025 S 20 D $ 112.34 73,874 D Common Stock 11/06/2025 M 11,470 A $ 51.81 85,344 D Common Stock 11/06/2025 S 11,470 D $ 111.0531 ( 5 ) 73,874 D Common Stock 11/06/2025 M 1,709 A $ 82.31 75,583 D Common Stock 11/06/2025 S 1,709 D $ 110.745 ( 6 ) 73,874 D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Stock Option (right-to-buy) $ 27.8 11/06/2025 M 2,546 ( 7 ) 05/08/2030 Common Stock 2,546 $ 0 0 D Stock Option (right-to-buy) $ 42.86 11/06/2025 M 15,682 ( 8 ) 05/06/2031 Common Stock 15,682 $ 0 0 D Stock Option (right-to-buy) $ 35.8 11/06/2025 M 19,780 ( 9 ) 05/04/2032 Common Stock 19,780 $ 0 0 D Stock Option (right-to-buy) $ 51.81 11/06/2025 M 11,470 ( 10 ) 05/04/2033 Common Stock 11,470 $ 0 5,734 D Stock Option (right-to-buy) $ 82.31 11/06/2025 M 1,709 ( 11 ) 05/02/2034 Common Stock 1,709 $ 0 8,545 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other WEBER MARK 1333 BUTTERFIELD ROAD SUITE 500 DOWNERS GROVE, IL60515 SVP & COO Signatures Diane I. Bonina, attorney-in-fact for Mark Weber 11/10/2025 Signature of Reporting Person Date

Explanation of Responses:

( 1 )This transaction was executed in multiple trades at prices ranging from $112.05 to $112.63; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 2 )This transaction was executed in multiple trades at prices ranging from $112.46 to $112.69; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 3 )This transaction was executed in multiple trades at prices ranging from $111.28 to $112.13; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 4 )This transaction was executed in multiple trades at prices ranging from $111.25 to $112.20; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 5 )This transaction was executed in multiple trades at prices ranging from $110.71 to $111.51; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 6 )This transaction was executed in multiple trades at prices ranging from $110.71 to $110.78; the price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide full information regarding the number of shares and prices at which the transactions were effected upon request to the SEC, Federal Signal Corporation, or a security holder of Federal Signal Corporation. ( 7 )The option vested as to 8,122 shares on 05/08/2021, 8,121 shares on 05/08/2022 and 8,121 shares on 05/08/2023. ( 8 )The option vested as to 5,228 shares on 05/06/2022, 5,227 shares on 05/06/2023 and 5,227 shares on 05/06/2024. ( 9 )The option vested as to 6,594 shares on 05/04/2023, 6,593 shares on 05/04/2024 and 6,593 shares on 05/04/2025. ( 10 )The option vested as to 5,735 shares on 05/04/2024 and 5,735 shares on 05/04/2025. The remaining 5,734 options will vest on 05/04/2026. ( 11 )The option vested as to 3,418 shares on 05/02/2025. The remaining options will vest as to 3,418 shares on 05/02/2026 and 3,418 shares on 05/02/2027.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

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