Company: WCN
Filing Date: 2025-05-30
Form Type: 424B5
Source: 0001104659-25-054854
Chunk: 8

Company: Waste Connections, Inc.
Filing Date: 2025-05-30
Form: 424B5
Chunk 8
---

Certain affiliates of the underwriters will receive at least 5% of the net proceeds of this offering in connection with the repayment of a portion of the borrowings outstanding under the Revolving Credit Facility. See “Use of Proceeds” in this prospectus supplement. Accordingly, this offering is being made in compliance with the requirements of FINRA Rule 5121. In accordance with that rule, no “qualified independent underwriter” is required because the securities will be rated investment grade.

Trustee

U.S. Bank Trust Company, National Association.

<div align='center'>S-3</div>

TABLE OF CONTENTS

Risk Factors

You should carefully consider the information under “Risk Factors” beginning on page S-9of this prospectus supplement, as well as the risk factors in our Annual Report on Form 10-K for the year ended December 31, 2024, as updated by our subsequent filings under the Exchange Act, before deciding to invest in the Notes.

<div align='center'>S-4</div>

TABLE OF CONTENTS

SUMMARY FINANCIAL DATA The following table sets forth our summary historical financial data as of and for the periods indicated. The summary historical and financial data were derived from the unaudited and audited historical financial statements that are incorporated by reference in this prospectus supplement and the accompanying base prospectus. You should read this summary financial data in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2024, and our Quarterly Report on Form 10-Q for the three months ended March 31, 2025, as well as our historical financial statements and accompanying notes included therein, which are incorporated by reference in this prospectus supplement.

| ​                                                                       
 ​                                                                       
 ​                                                                       
 STATEMENT OF OPERATIONS DATA:                                           | ​ 
 ​ 
 ​ 
 ​ | ​ 
 ​ 
 ​ 
 ​ | Three MonthsEnded March 31,               
 2025                                      
 (unaudited)(in thousands of U.S. dollars) 
 ​                                         | ​ |         ​ | ​ | ​ 
 ​ | ​ 
 ​ | 2024 
 ​    | ​ |         ​ | ​ | ​ 
 ​ 
 ​ 
 ​ | ​ 
 ​ 
 ​ 
 ​ | Years EndedDecember 31,                 
 2024                                    
 (audited)(in thousands of U.S. dollars) 
 ​                                       | ​ |         ​ | ​ | ​ 
 ​ | ​ 
 ​ | 2023 
 ​    | ​ |