Initial Statement of Beneficial Ownership (Form 3)

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 INITIAL STATEMENT OF 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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(Print or Type Responses)

1. Name and Address of Reporting Person * Laughlin Daniel T. 2. Date of Event Requiring Statement (Month/Day/Year) 03/31/2026 3. Issuer Name and Ticker or Trading Symbol SiteOne Landscape Supply, Inc. [SITE] (Last) (First) (Middle) MANSELL OVERLOOK, 300 COLONIAL CENTER PARKWAY, SUITE 600 4. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner __X__ Officer (give title below) _____ Other (specify below) SVP, Strategy & Development 5. If Amendment, Date Original Filed (Month/Day/Year) (Street) ROSWELL, GA 30076 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 Beneficially Owned

1.Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.			SEC 1473 (7-02)
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Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Share Units	(1)	(1)	Common Stock	5,197	(3)	D
Restricted Share Units	(2)	(2)	Common Stock	3,042	(3)	D

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Laughlin Daniel T. MANSELL OVERLOOK 300 COLONIAL CENTER PARKWAY, SUITE 600 ROSWELL, GA 30076			SVP, Strategy & Development

Signatures

/s/ Travis Jackson, Attorney-in-fact for Daniel Laughlin		04/10/2026
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 5(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)	On January 2, 2026, the Reporting Person was granted 5,197 RSUs, vesting in four equal annual installments beginning on January 2, 2027, subject to the Reporting Person's continued employment. Prior to the filing of this Form 3, none of these RSUs had vested.
(2)	On February 4, 2026, the Reporting Person was granted 3,042 RSUs, vesting in four equal annual installments beginning on February 4, 2027, subject to the Reporting Person's continued employment. Prior to the filing of this Form 3, none of these RSUs had vested.
(3)	RSUs convert into shares of Common Stock upon vesting on a one-for-one basis.
Remarks: Exhibit 24 - Power of Attorney

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