SiteOne (SITE) CEO logs RSU vesting and 848-share tax withholding

Rhea-AI Filing Summary

SiteOne Landscape Supply CEO Doug Black reported the vesting of 2,009 Restricted Stock Units, which converted into an equal number of common shares on February 9, 2026. To cover related tax obligations, 848 common shares were withheld at a price of $145.65 per share.

After these transactions, Black directly held 491,284 shares of common stock, and also had indirect ownership of 3,591 shares through a family trust and 93,675 shares through a SLAT, as reflected in the filing.

SEC Form 4

FORM 4

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
or Section 30(h) of the Investment Company Act of 1940

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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 for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

BLACK DOUG

(Last) (First) (Middle)

MANSELL OVERLOOK

300 COLONIAL CENTER PARKWAY, SUITE 600

(Street)

ROSWELL GA 30076

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SiteOne Landscape Supply, Inc. [ SITE ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CEO

3. Date of Earliest Transaction (Month/Day/Year)
02/09/2026

4. If Amendment, Date of 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

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	02/09/2026		M		2,009	A	(1)	492,132	D
Common Stock	02/09/2026		F		848	D	$145.65	491,284	D
Common Stock								3,591	I	By Family Trust(2)
Common Stock								93,675	I	By SLAT

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 Securities Underlying Derivative Security (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: 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
Restricted Stock Units	(1)	02/09/2026		M			2,009	(3)	(3)	Common Stock	2,009	$0.00	2,008	D

Explanation of Responses:

1. Filed to report vesting of Restricted Stock Units ("RSUs"). RSUs convert into common stock on a one-for-one basis.

2. Reflects indirect ownership by a family trust for which the Reporting Person's spouse serves as trustee.

3. On February 9, 2023, the Reporting Person was granted 8,034 RSUs, vesting in four equal annual installments beginning on February 9, 2024, subject to the Reporting Person's continued employment.

	/s/ Travis Jackson, Attorney-in-fact for Doug Black	02/11/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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FAQ

What insider transaction did SiteOne (SITE) CEO Doug Black report?

Doug Black reported vesting of 2,009 Restricted Stock Units that converted into common stock. The filing also shows a related tax-withholding transaction where 848 common shares were withheld at $145.65 per share, all recorded as direct ownership changes.

How many SiteOne (SITE) RSUs vested for Doug Black on February 9, 2026?

On February 9, 2026, 2,009 Restricted Stock Units vested for Doug Black. Each RSU converted into one share of SiteOne common stock, reflecting part of an 8,034-RSU grant scheduled to vest in four equal annual installments beginning February 9, 2024.

Was there a tax withholding component in Doug Black’s SiteOne (SITE) Form 4?

Yes. The Form 4 reports a tax-withholding disposition of 848 SiteOne common shares at $145.65 per share. This transaction, coded “F,” represents shares withheld to satisfy tax obligations associated with the RSU vesting rather than an open-market sale.

How many SiteOne (SITE) shares does Doug Black own directly after this filing?

Following the reported RSU vesting and tax withholding, Doug Black directly owns 491,284 SiteOne common shares. This figure reflects his updated direct holdings after the conversion of 2,009 RSUs and the withholding of 848 shares for tax purposes on the same date.

Does Doug Black have indirect ownership of SiteOne (SITE) shares through trusts?

Yes. The filing shows 3,591 SiteOne common shares held indirectly through a family trust, where his spouse serves as trustee, and 93,675 common shares held indirectly through a SLAT, indicating additional indirect beneficial ownership beyond his direct holdings.

What RSU grant schedule underlies Doug Black’s 2026 SiteOne (SITE) vesting?

The vested RSUs come from an 8,034-unit grant awarded on February 9, 2023. These RSUs vest in four equal annual installments beginning on February 9, 2024, subject to Doug Black’s continued employment with SiteOne Landscape Supply, as disclosed in the filing footnotes.