SiteOne (SITE) CEO Doug Black reports RSU vesting and tax share withholding

Rhea-AI Filing Summary

SiteOne Landscape Supply CEO Doug Black reported routine equity compensation activity. On February 5, 2026, 3,865 Restricted Stock Units vested and converted into the same number of common shares. To cover taxes, 1,049 shares were withheld at a price of $148.03 per share.

After these transactions, Black directly owned 487,996 common shares and 11,595 RSUs. He also indirectly held 3,591 shares through a family trust and 93,675 shares through a SLAT, reflecting additional long-term ownership linked to estate and family planning structures.

Insights

Equity Compensation & Governance Analyst

Routine RSU vesting and tax withholding with continued large share ownership.

The filing shows Doug Black, CEO and director of SiteOne Landscape Supply, reporting normal equity compensation events. 3,865 RSUs vested into common stock, consistent with a four-year vesting schedule granted on February 5, 2025.

To satisfy tax obligations, 1,049 shares were withheld at $148.03 per share, a common payroll-tax treatment rather than an open-market sale. Following this, Black still held 487,996 shares directly and 11,595 RSUs, plus indirect holdings via a family trust and a SLAT.

For investors, this indicates ongoing alignment between the CEO and shareholders through substantial equity ownership. The activity appears administrative and compensation-related, without signals of a discretionary reduction in economic exposure based on the information provided.

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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)
02/05/2026

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	02/05/2026		M		3,865	A	(1)	489,045	D
Common Stock	02/05/2026		F		1,049	D	$148.03	487,996	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)	02/05/2026		M			3,865	(3)	(3)	Common Stock	3,865	$0.00	11,595	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 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.

	/s/ Travis Jackson, Attorney-in-fact for Doug Black	02/09/2026
	** Signature of Reporting Person	Date
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).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

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

Doug Black reported the vesting of 3,865 Restricted Stock Units, which converted into the same number of SiteOne common shares. To cover related taxes, 1,049 shares were withheld at $148.03 per share, a standard method for satisfying withholding obligations on equity compensation.

How many SiteOne (SITE) shares does CEO Doug Black own after these transactions?

After the reported transactions, Doug Black directly owned 487,996 SiteOne common shares and 11,595 Restricted Stock Units. He also indirectly held 3,591 shares through a family trust and 93,675 shares through a SLAT, reflecting significant ongoing equity exposure to the company.

What do the vested RSUs mean in Doug Black’s Form 4 for SiteOne (SITE)?

The Form 4 shows 3,865 Restricted Stock Units vested and converted into the same number of SiteOne common shares. These RSUs were part of a 15,460-unit grant from February 5, 2025, vesting in four equal annual installments starting February 5, 2026.

Was Doug Black’s share withholding in SiteOne (SITE) an open-market sale?

The 1,049 SiteOne shares at $148.03 per share were reported under transaction code “F,” indicating shares withheld to satisfy tax withholding obligations. This is typically an administrative transaction rather than a discretionary open-market sale by the insider.

How are Doug Black’s indirect SiteOne (SITE) holdings structured?

The filing reports 3,591 SiteOne common shares held indirectly through a family trust where his spouse is trustee, and 93,675 shares held indirectly through a SLAT. These entities are estate and family planning vehicles associated with the reporting person’s beneficial ownership.

What is the vesting schedule for Doug Black’s SiteOne (SITE) RSU grant?

On February 5, 2025, Doug Black received a grant of 15,460 Restricted Stock Units. According to the filing, these RSUs vest in four equal annual installments beginning on February 5, 2026, contingent on his continued employment with SiteOne.