SiteOne CEO buys 5,000 shares at $96.13

SiteOne Landscape Supply, Inc. (SITE) CEO Doug Black reported an open-market purchase of 5,000 shares of common stock on 2026-08-26 at $96.13 per share.

Rhea-AI Filing Summary

SiteOne Landscape Supply, Inc. (SITE) CEO Doug Black reported an open-market purchase of 5,000 shares of common stock on 2026-08-26 at $96.13 per share. The shares are held indirectly through a 2021 family trust for which he serves as trustee, bringing that trust’s holdings to 13,000 shares. He also reports 482,161 shares held directly and additional indirect holdings through other family trusts.

Insider Trade Summary

Net Buyer: 5,000 shares

Net Buy 4 txns

Insider BLACK DOUG

Role CEO

Bought 5,000 shs ($481K)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1	5,000	$96.13	$481K
holding	Common Stock	--	--	--
holding	Common Stock	--	--	--
holding	Common Stock F2	--	--	--

Holdings After Transaction: Common Stock — 13,000 shares (Indirect, By 2021 Family Trust); Common Stock — 482,161 shares (Direct); Common Stock — 93,675 shares (Indirect, By SLAT); Common Stock — 13,591 shares (Indirect, By 2019 Family Trust)

Footnotes (2)

1. F1. Reflects indirect ownership by a family trust for which the Reporting Person serves as trustee.
2. F2. Reflects indirect ownership by a family trust for which the Reporting Person serves as trustee.

Key Figures

Shares purchased: 5,000 shares Purchase price per share: $96.13 per share Indirect holdings – 2021 Family Trust: 13,000 shares +3 more

6 metrics

Shares purchased 5,000 shares Common Stock bought on 2026-08-26 by 2021 Family Trust

Purchase price per share $96.13 per share Price for 5,000-share Common Stock purchase on 2026-08-26

Indirect holdings – 2021 Family Trust 13,000 shares Total Common Stock held indirectly after purchase

Direct holdings after transaction 482,161 shares Common Stock held directly by Doug Black as of 2026-08-26

Indirect holdings – SLAT 93,675 shares Common Stock held indirectly through SLAT as of 2026-08-26

Indirect holdings – 2019 Family Trust 13,591 shares Common Stock held indirectly through 2019 Family Trust as of 2026-08-26

Key Terms

indirect ownership, family trust, SLAT, Rule 10b5-1

4 terms

indirect ownership financial

"Reflects indirect ownership by a family trust for which the Reporting Person"

family trust financial

"Reflects indirect ownership by a family trust for which the Reporting"

SLAT financial

"Common Stock holding of 93,675.0000 shares, nature of ownership: By SLAT"

Rule 10b5-1 regulatory

"aff_10b5_one indicates the Rule 10b5-1 trading plan checkbox status"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transaction did SITE CEO Doug Black report on this Form 4?

Doug Black reported a purchase of 5,000 shares of SiteOne Landscape Supply, Inc. common stock on 2026-08-26, at a price of $96.13 per share, held indirectly through a 2021 family trust for which he serves as trustee.

Was the SITE CEO’s August 26, 2026 trade a buy or a sell?

The reported transaction was a buy. Doug Black, CEO of SiteOne Landscape Supply, Inc. (SITE), purchased 5,000 shares of common stock in an open-market or private transaction at $96.13 per share.

How many SITE shares does Doug Black hold directly after this Form 4?

After the reported transactions, Doug Black holds 482,161 shares of SiteOne Landscape Supply, Inc. common stock directly, as disclosed in the holding entry dated 2026-08-26.

What are Doug Black’s indirect holdings in SITE through family trusts?

Doug Black reports indirect ownership of SiteOne Landscape Supply, Inc. shares through family trusts: 13,000 shares via a 2021 family trust, 93,675 shares via a SLAT, and 13,591 shares via a 2019 family trust, each reflecting his role as trustee.

Was the SITE CEO’s August 26, 2026 trade under a Rule 10b5-1 plan?

No. The filing’s Rule 10b5-1 checkbox is not affirmed (aff_10b5_one is false), indicating the 5,000-share purchase on 2026-08-26 was not reported as made under a Rule 10b5-1 trading plan.

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Available on EDGAR 08/28/2026 - 05:11 PM Accepted by SEC EDGAR 08/28/2026 - 05:11 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^*

BLACK DOUG

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026

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	08/26/2026		P		5,000	A	$96.13	13,000	I	By 2021 Family Trust(1)
Common Stock								482,161	D
Common Stock								93,675	I	By SLAT
Common Stock								13,591	I	By 2019 Family Trust(2)

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

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

	/s/ Travis Jackson, Attorney-in-fact for Doug Black	08/28/2026
	** 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)