Company: WCN
Filing Date: 2025-05-30
Form Type: 424B5
Source: 0001104659-25-054854
Chunk: 4

Company: Waste Connections, Inc.
Filing Date: 2025-05-30
Form: 424B5
Chunk 4
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, goodwill impairments, insurance costs and cybersecurity threats.

These statements can be identified by the use of forward-looking terminology such as “believes,” “expects,” “intends,” “may,” “might,” “will,” “could,” “should,” or “anticipates,” or the negative thereof or comparable terminology, or by discussions of strategy.

Our business and operations are subject to a variety of risks and uncertainties and, consequently, actual results may differ materially from those projected by any forward-looking statements. Factors that could cause actual results to differ from those projected are discussed under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Annual Report on Form 10-K for the year ended December 31, 2024, as may be updated or supplemented from time to time in our other filings with the SEC in the future that are incorporated herein.

There may be additional risks of which we are not presently aware or that we currently believe are immaterial that could have an adverse impact on our business. We make no commitment to revise or update any forward-looking statements to reflect events or circumstances that may change, unless required under applicable securities laws.

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TABLE OF CONTENTS

### SUMMARY
This summary highlights selected information from this prospectus supplement or incorporated by reference in this prospectus supplement and the accompanying base prospectus. Because this is only a summary, it may not contain all of the information you should consider in making your investment decision. To understand all of the terms of this offering and for a more complete understanding of our business, you should carefully read this entire prospectus supplement and the accompanying base prospectus, particularly the sections entitled “Risk Factors” beginning on page S-9of this prospectus supplement and 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, and the other documents incorporated by reference in this prospectus supplement and the accompanying base prospectus.

#### Waste Connections, Inc.
We are the third largest solid waste services company in North America, providing non-hazardous waste collection, transfer and disposal services, including by rail, along with resource recovery primarily through recycling and renewable fuels generation, in 46 states in the U.S. and six provinces in Canada. We also provide non-hazardous oil and natural gas exploration and production, or E&P, waste treatment, recovery and disposal services in several basins across the U