[Form 4] SiteOne Landscape Supply, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Fred M. Diaz, a director of SiteOne Landscape Supply, Inc. (SITE), reported a sale of 865 shares of the issuer's common stock on 08/29/2025 at a price of $145.07 per share. The Form 4 shows the transaction was executed under a Rule 10b5-1 sales plan adopted by the reporting person on May 27, 2025. Following the reported sale, Mr. Diaz beneficially owned 11,267 shares, held directly. The filing was signed by attorney-in-fact John Guthrie on 09/03/2025. The Form 4 is a routine disclosure of an insider sale made pursuant to a pre-established trading plan.

Positive

• Transaction executed under a Rule 10b5-1 plan, indicating pre-established trading instructions and compliance intent
• Timely Form 4 disclosure filed and signed by attorney-in-fact, providing transparency on insider activity
• Post-transaction beneficial ownership disclosed (11,267 shares), allowing investors to see remaining insider stake

Negative

• Insider sale reported, which may be interpreted by some investors as decreased insider shareholding
• No context on relative size of the sale versus total insider holdings or company float in the filing

Insights

Financial Analyst

TL;DR: Director sold a small block of shares under a 10b5-1 plan; transaction is a routine insider disclosure without additional financial data.

The Form 4 reports a single non-derivative sale of 865 shares at $145.07 on 08/29/2025 executed under a Rule 10b5-1 plan adopted 05/27/2025. The filing shows direct ownership of 11,267 shares after the sale. There are no accompanying disclosures of option exercises, additional grants, or other material transactions. From an earnings/valuation perspective, this filing provides only disclosure of insider liquidity, not operational or financial performance metrics.

Corporate Governance Expert

TL;DR: Sale executed under a documented 10b5-1 plan and reported promptly; governance disclosure appears compliant.

The reporting person is identified as a director and the Form 4 indicates the sale was pursuant to an established Rule 10b5-1 plan, which typically provides an affirmative defense against insider trading claims when properly adopted. The Form 4 was signed by an attorney-in-fact and includes the plan adoption date and post-transaction beneficial ownership. There are no signs in this filing of unreported related-party transactions or deviations from standard Section 16 reporting.

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).

X

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^*

Diaz Fred M

(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
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
08/29/2025

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	08/29/2025		S(1)		865	D	$145.07	11,267	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. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 sales plan adopted by the Reporting Person on May 27, 2025.

	/s/ John Guthrie, attorney-in-fact for Fred Diaz	09/03/2025
	** 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 did SITE director Fred M. Diaz sell and when?

He sold 865 shares of SiteOne (SITE) common stock on 08/29/2025 at $145.07 per share.

Was the SITE insider sale part of a trading plan?

Yes. The sale was effected pursuant to a Rule 10b5-1 sales plan adopted by the reporting person on May 27, 2025.

How many SITE shares did Fred M. Diaz own after the reported transaction?

The Form 4 reports 11,267 shares beneficially owned following the sale.

Who signed the Form 4 for the SITE filing?

The Form 4 was signed by John Guthrie, attorney-in-fact for Fred Diaz, on 09/03/2025.

Does the Form 4 show any derivative transactions for SITE?

No. The filing provides only a non-derivative sale of common stock and contains no derivative securities transactions.