DOUG BLACK - 05 Feb 2026 Form 4 Insider Report for SiteOne Landscape Supply, Inc. (SITE)

Role: CEO, Director
Signature: /s/ Travis Jackson, Attorney-in-fact for Doug Black
Issuer symbol: SITE
Transactions as of: 05 Feb 2026
Net transactions value: -$155,283
Form type: 4
Filing time: 09 Feb 2026, 17:20:28 UTC
Previous filing: 06 Feb 2026
Next filing: 10 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
BLACK DOUG	CEO, Director	MANSELL OVERLOOK, 300 COLONIAL CENTER PARKWAY, SUITE 600, ROSWELL	/s/ Travis Jackson, Attorney-in-fact for Doug Black	09 Feb 2026	0001672083

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	SITE	Common Stock	Options Exercise		+3,865	+0.8%		489,045	05 Feb 2026	Direct	F1
transaction	SITE	Common Stock	Tax liability	$155,283	-1,049	-0.21%	$148.03	487,996	05 Feb 2026	Direct
holding	SITE	Common Stock						3,591	05 Feb 2026	By Family Trust	F2
holding	SITE	Common Stock						93,675	05 Feb 2026	By SLAT

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	SITE	Restricted Stock Units	Options Exercise	$0	-3,865	-25%	$0.000000	11,595	05 Feb 2026	Common Stock	3,865		Direct	F1, F3

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.
F2	Reflects indirect ownership by a family trust for which the Reporting Person's spouse serves as trustee.
F3	On February 5, 2025, the Reporting Person was granted 15,460 RSUs, vesting in four equal annual installments beginning on February 5, 2026, subject to the Reporting Person's continued employment.