SiteOne director granted 1,186 deferred stock units

Douglas William W III reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Douglas William W III reported acquisition or exercise transactions in this Form 4 filing.

SiteOne Landscape Supply director Douglas William W III received a grant of 1,186 deferred stock units as director fees on common stock. These units vest in full upon the earlier of the day before the company’s next annual stockholder meeting or the first anniversary of May 13, 2026. Settlement is deferred until he leaves the board or there is a change in control. Following this award, he directly holds 19,120 shares and units in total.

Insider Trade Summary

Grant/Award: 1,186 shares

Grant/Award 1 txn

Insider Douglas William W III

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	1,186	$0.00	$0.00

Holdings After Transaction: Common Stock — 19,120 shares (Direct)

Footnotes (2)

1. F1. Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.
2. F2. Includes deferred stock units.

Key Figures

Deferred stock units granted: 1,186 units Total holdings after grant: 19,120 shares/units Vesting condition: Earlier of next annual meeting eve or 1-year from May 13, 2026 +1 more

4 metrics

Deferred stock units granted 1,186 units Director fees grant on Common Stock

Total holdings after grant 19,120 shares/units Direct ownership following transaction

Vesting condition Earlier of next annual meeting eve or 1-year from May 13, 2026 Full vesting trigger for deferred stock units

Settlement trigger Board service termination or change in control Timing of share settlement for deferred stock units

Key Terms

deferred stock units, annual meeting of stockholders, change in control

3 terms

deferred stock units financial

"Represents deferred stock units granted as director fees."

Deferred stock units are promises from a company to give an employee shares of stock at a future date, often after certain conditions are met or after leaving the company. They function like a form of delayed compensation, allowing employees to earn shares over time. For investors, they represent potential future ownership in the company, but do not provide immediate voting rights or dividends until the shares are actually received.

annual meeting of stockholders financial

"vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders"

change in control financial

"Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company."

A "change in control" occurs when the ownership or management of a company shifts significantly, such as through a merger, acquisition, or sale of a large part of its assets. This change can impact how the company is run and may influence its future direction. For investors, it matters because it can affect the company's stability, strategy, and value, often signaling potential changes in investment risk or opportunity.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did SiteOne (SITE) director Douglas William W III receive in this Form 4?

He received a grant of 1,186 deferred stock units as director fees. These units are tied to SiteOne common stock and increase his total direct holdings to 19,120 shares and units combined after the award.

How and when do the new deferred stock units for SITE vest?

The 1,186 deferred stock units vest in full at a single time. Vesting occurs on the earlier of the day before SiteOne’s next annual stockholder meeting or the first anniversary of May 13, 2026, according to the filing footnote.

When will the SiteOne (SITE) deferred stock units be settled into shares?

Settlement of the deferred stock units is postponed beyond vesting. They are settled only at the earlier of Douglas William W III’s termination of board service or a change in control of SiteOne Landscape Supply, as specified in the footnotes.

How many SiteOne (SITE) shares and units does the director hold after this grant?

After the grant, Douglas William W III holds 19,120 SiteOne common shares and deferred stock units directly. The filing notes that this total includes the newly granted deferred stock units reported in this Form 4.

Is this SiteOne (SITE) Form 4 an open-market purchase or a compensation grant?

This Form 4 reflects a compensation-related grant, not an open-market trade. The 1,186 units are identified as deferred stock units granted as director fees, with a transaction code A for grant or award acquisition.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 05/14/2026 - 07:05 PM Learn about SEC filing dates

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^*

Douglas William W III

(Last) (First) (Middle)

MANSELL OVERLOOK

300 COLONIAL CENTER PARKWAY, SUITE 600

(Street)

ROSWELL GEORGIA 30076

(City) (State) (Zip)

UNITED STATES

(Country)

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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/13/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

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	05/13/2026		A		1,186(1)	A	$0	19,120(2)	D

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

Explanation of Responses:

1. Represents deferred stock units granted as director fees. The deferred stock units vest in full upon the earlier of (i) the day preceding the Company's next annual meeting of stockholders and (ii) the first anniversary of May 13, 2026. Settlement is deferred until the earlier of the Reporting Person's termination of board service and a change in control of the Company.

2. Includes deferred stock units.

Remarks:

Exhibit 24 - Power of Attorney

	/s/ Travis Jackson, Attorney-in-fact for William W. Douglas III	05/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)