Statement of Changes in Beneficial Ownership (Form 4)

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b). Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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1. Name and Address of Reporting Person * SHERMAN JENNIFER L 2. Issuer Name and Ticker or Trading Symbol FEDERAL SIGNAL CORP /DE/ [FSS] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) President & CEO (Last) (First) (Middle) 1333 BUTTERFIELD ROAD, SUITE 500 3. Date of Earliest Transaction (Month/Day/Year) 05/01/2026 (Street) DOWNERS GROVE, IL 60515 4. If Amendment, Date Original Filed (Month/Day/Year) 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 (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 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 05/01/2026 M 59,242 A $12.66 679,098.6085(1) D Common Stock 05/01/2026 F 29,680 D $121.61 649,418.6085 D Common Stock 05/04/2026 F 7,695 D $117.49 641,723.6085 D Common Stock 60,221.4278(2) I held by 401(k) plan

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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 (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

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 (Month/Day/Year)

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)

$12.66

05/01/2026

M

59,242

(3)

05/05/2026

Common Stock

59,242

$ 0

0

D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
SHERMAN JENNIFER L 1333 BUTTERFIELD ROAD SUITE 500 DOWNERS GROVE, IL 60515	X		President & CEO

Signatures

Diane I. Bonina, attorney-in-fact for Jennifer L. Sherman		05/05/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	828.7732 shares were acquired through the dividend reinvestment plan.
(2)	Units held in the Issuer 401(k) plan, which are convertible into Issuer common stock, were adjusted from 60,195.9816 to 60,221.4278 based on the Issuer price per share of $121.61 on 05/01/2026.
(3)	The option vested in three equal installments on May 05, 2017, 2018, and 2019. The option was set to expire on May 05, 2026. The reporting person used 29,680 shares of the option to satisfy the exercise price and taxes related to the option and will hold the remaining option shares.

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