SiteOne director awarded 1,186 deferred stock units

WYSZOMIERSKI JACK L reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

WYSZOMIERSKI JACK L reported acquisition or exercise transactions in this Form 4 filing.

SiteOne Landscape Supply, Inc. director Jack L. Wyszomierski received a grant of 1,186 deferred stock units as director fees in the form of Common Stock. The units were granted at no cash cost per share and increase his direct holdings to 19,120 shares.

The deferred stock units vest in full upon the earlier of the day preceding SiteOne’s next annual meeting of stockholders or the first anniversary of May 13, 2026. Settlement of these units into shares is deferred until the earlier of his termination of board service or a change in control of the company.

Insider Trade Summary

Grant/Award: 1,186 shares

Grant/Award 1 txn

Insider WYSZOMIERSKI JACK L

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 Grant price per unit: $0.0000 per share Total shares after transaction: 19,120 shares +1 more

4 metrics

Deferred stock units granted 1,186 units Director fees grant on May 13, 2026

Grant price per unit $0.0000 per share Reported transaction price for deferred stock units

Total shares after transaction 19,120 shares Director’s direct holdings following grant

Vesting condition date reference May 13, 2026 First anniversary reference for vesting trigger

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. The deferred stock units vest in full upon the earlier of..."

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.

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

Form 4 Insider Transactions: What Each Field Means →

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 05/14/2026 - 07:12 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^*

WYSZOMIERSKI JACK L

(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 Jack L. Wyszomierski	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)