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): November 23, 2016

SiteOne Landscape Supply, Inc.

(Exact name of registrant as specified in its charter)

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:

SiteOne Landscape Supply, Inc. (the “Company”) announced today that certain of its subsidiaries have entered into (i) the First Amendment to Amended and Restated Credit Agreement, dated as of November 23, 2016 (the “First Amendment”), by and among SiteOne Landscape Supply Holding, LLC (“Holding”) and SiteOne Landscape Supply, LLC, as borrowers (collectively, the “Borrowers”), UBS AG, Stamford Branch, as administrative agent and collateral agent, the several banks and other financial institutions party thereto and certain other parties party thereto from time to time and (ii) the Increase Supplement, dated as of November 23, 2016 (together with the First Amendment, the “Term Loan Facility Amendments”), by and among Holding and UBS AG, Stamford Branch, each of which amend the Amended and Restated Credit Agreement, dated as of April 29, 2016 (the “Term Loan Facility”), by and among the Borrowers, UBS AG, Stamford Branch, as administrative agent and collateral agent, the several banks and other financial institutions party thereto and certain other parties party thereto from time to time, in order to, among other things, (i) add an additional credit facility under the Term Loan Facility consisting of additional term loans (the “Tranche B Term Loans”) in an aggregate principal amount of $273,625,000 and (ii) increase the aggregate principal amount of Tranche B Term Loans under the Term Loan Facility to $298,625,000. Proceeds of the Tranche B Term Loans were used to, among other things, (i) repay in full the term loans outstanding under the Term Loan Facility immediately prior to effectiveness of the Term Loan Facility Amendments (the “Existing Term Loans”) and (ii) repay $21,000,000 of borrowings outstanding under the Senior ABL Facility (as defined in the Term Loan Facility).

The Existing Term Loans bore interest, at Holding’s option, at either (i) an adjusted LIBOR rate plus an applicable margin equal to 5.25% or (ii) an alternative base rate plus an applicable margin equal to 4.25%. The Tranche B Term Loans bear interest, at Holding’s option, at either (i) an adjusted LIBOR rate plus an applicable margin equal to 4.50% or (ii) an alternative base rate plus an applicable margin equal to 3.50%. Voluntary prepayments of the Tranche B Term Loans are permitted at any time, in minimum principal amounts, without premium or penalty, subject to a 1.00% premium payable in connection with certain repricing transactions within the first six months after the date of the initial funding of the Tranche B Term Loans. Like the Existing Term Loans, the Tranche B Term Loans will mature on April 29, 2022. The other terms of the Tranche B Term Loans are generally the same as the terms applicable to the Existing Term Loans.

Item 2.03. Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant

The information contained in Item 1.01 concerning the Company’s direct financial obligations under the Term Loan Facility Amendments is hereby incorporated herein by reference.

(d) Exhibits

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.

Date: November 23, 2016

EXHIBIT INDEX