SiteOne Landscape Supply, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

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SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934 (Amendment No. )

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Filed by the Registrant

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Filed by a Party other than the Registrant

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Check the appropriate box:

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Preliminary Proxy Statement

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Confidential, for use of the Commission only (as permitted by Rule 14A-6(E)(2))

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material Pursuant to Section 240.14a-12

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SiteOne Landscape Supply, Inc.

(Name of Registrant as Specified In Its Charter)

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(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check the appropriate box):

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No fee required.

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Fee paid previously with preliminary materials.

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11

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2025 PROXY STATEMENT

AND

NOTICE OF 2025 ANNUAL

MEETING OF STOCKHOLDERS

Wednesday, May 14, 2025

9:00 a.m., Eastern Time

Hilton Atlanta Airport

300 Colonial Center Parkway

Suite 600

Roswell, Georgia 30076

April 2, 2025

Dear Fellow Stockholders:

On behalf of the Board of Directors of SiteOne Landscape Supply, Inc., I would like to express our appreciation for your continued interest in our company. It is my pleasure to invite you to SiteOne’s Annual Meeting of Stockholders, to be held at the Hilton Atlanta Airport, 1031 Virginia Avenue, Hapeville, Georgia 30354 on Wednesday, May 14, 2025, at 9:00 a.m., Eastern Time.

As we look back on the past year, I am very proud of our team’s continuing dedication to our vision and values. Despite the challenges posed by softer markets, operating cost inflation and commodity price deflation, our team adeptly navigated these conditions, delivering net sales growth and making significant progress on our strategic initiatives and acquisition integrations. Our well-balanced business, strong balance sheet, extensive product portfolio and geographic diversity also contributed to this resilience and continue to position us to capitalize on the significant opportunities within our industry. Our focus therefore remains on delivering superior value for our customers, nurturing our entrepreneurial spirit, and driving sustainable growth to ensure long-term value creation for all our stakeholders.

The formal Notice of Annual Meeting and Proxy Statement are enclosed with this letter. The Proxy Statement describes the matters to be acted upon at the Annual Meeting. It also describes how the Board operates and provides compensation and other information about the management team and Board.

Your vote is important. Whether or not you plan to attend the Annual Meeting, I strongly encourage you to vote as soon as possible. You may vote over the Internet, by telephone or by mailing a proxy or voting instruction card. For instructions on voting, please refer to the Notice of Internet Availability of Proxy Materials you received in the mail or the section entitled “How Do I Vote” on page 65 of the Proxy Statement. If you received a paper copy of the Proxy Statement, please use your enclosed proxy card to vote.

Finally, I would like to once again emphasize that the Board places a high value on feedback from our stockholders. In 2024, we continued our robust stockholder outreach program, now in its seventh year, by engaging with firms and/or their affiliates who collectively held approximately 60% of our outstanding shares. Please review the summary of our outreach program beginning on page 3 of the Proxy Statement. The feedback we received during these meetings contributed positively to our boardroom conversations and decision-making, and we look forward to continuing to strengthen this program in the future.

Thank you for your ongoing support of SiteOne.

Sincerely,

Doug Black

Chairman of the Board and Chief Executive Officer

300 Colonial Center Parkway

Suite 600

Roswell, Georgia 30076

Admission: To attend the meeting in person, you will need to present a form of government-issued photo identification, and beneficial stockholders will need to present proof of beneficial stock ownership (see page 66 for acceptable proof of beneficial ownership) as of the record date.

Your vote is important. For instructions on voting, please refer to the Notice of Internet Availability of Proxy Materials you received in the mail or the section entitled “How Do I Vote” on page 65 of the Proxy Statement. If you received a paper copy of the Proxy Statement, please use your enclosed proxy card to vote.

2025 PROXY STATEMENT

We are providing this Proxy Statement (this “Proxy Statement”) in connection with the solicitation by the Board of Directors (the “Board”) of SiteOne Landscape Supply, Inc., a Delaware corporation (referred to as “SiteOne,” the “Company,” “we,” “us” or “our”), of proxies to be voted at our 2025 Annual Meeting of Stockholders (the “Annual Meeting”) and at any reconvened or rescheduled meeting following any adjournment or postponement. The Annual Meeting will be held at the Hilton Atlanta Airport, 1031 Virginia Avenue, Hapeville, Georgia 30354 on Wednesday, May 14, 2025, at 9:00 a.m., Eastern Time.

This Proxy Statement contains important information for you to consider when deciding how to vote. Please read this information carefully.

Important Notice Regarding the Availability of Proxy Materials for the Annual Meeting to be Held on May 14, 2025: This Proxy Statement is first being sent to stockholders on or about April 2, 2025. This Proxy Statement and our 2024 Annual Report on Form 10-K are available atwww.proxyvote.com.