UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of

the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 13, 2026

SiteOne Landscape Supply, Inc.

(Exact name of registrant as specified in its charter)

Delaware 001-37760 46-4056061
(State or other jurisdiction of
incorporation)
(Commission File Number) (IRS Employer Identification No.)
300 Colonial Parkway, Suite 600
Roswell, Georgia
30076
(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code:

(470) 277-7000

Not Applicable
(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Trading Symbol(s) Name of each exchange on which
registered
Common Stock, par value $0.01 per share SITE New York Stock Exchange

Item 5.07. Submission of Matters to a Vote of Security Holders.

On May 13, 2026, SiteOne Landscape Supply, Inc. (the “Company”) held its Annual Meeting of Stockholders (the “Annual Meeting”). At the Annual Meeting, three proposals were submitted to the Company’s stockholders. The final voting results were as follows:

Proposal 1: The Company’s stockholders elected the two nominees named in the Company’s 2026 Proxy Statement to serve a one-year term expiring at the Company’s 2027 Annual Meeting of Stockholders. The voting results are set forth below.

Director Nominee Votes For Votes Withheld Broker Non-Votes
William W. Douglas III 39,837,852 1,566,019 1,192,867
Jeri L. Isbell 40,518,404 885,467 1,192,867

Proposal 2: The Company’s stockholders ratified the appointment of Deloitte & Touche LLP to serve as the Company’s independent registered accounting firm for the 2026 fiscal year. The voting results are set forth below.

Votes For Votes Against Abstain
42,448,149 128,428 20,161

Proposal 3: The Company’s stockholders approved an advisory vote on the compensation of the Company’s named executive officers. The voting results are set forth below.

Votes For Votes Against Abstain Broker Non-Votes
40,505,407 876,683 21,781 1,192,867

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

SITEONE LANDSCAPE SUPPLY, INC.
By: /s/ Travis Jackson
Name: Travis Jackson
Title: General Counsel and Secretary

Date: May 19, 2026