Company: WCN
Filing Date: 2025-05-30
Form Type: 424B5
Source: 0001104659-25-054854
Chunk: 65

Company: Waste Connections, Inc.
Filing Date: 2025-05-30
Form: 424B5
Chunk 65
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 Annual Report on Form 10-K for the year ended December 31, 2024, filed on February 13, 2025;

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Our Quarterly Report on Form 10-Q for the quarter ended March 31, 2025, filed on April 24, 2025;

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The portions of our Definitive Management Information Circular and Proxy Statement on Schedule 14A, filed on April 4, 2025, that are incorporated by reference into Part III of our Annual Report on Form 10-K for the fiscal year ended December 31, 2024; and

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Our Current Reports on Form 8-K filed on May 16, 2025, May 20, 2025and May 27, 2025.

We will furnish, without charge to you, upon written or oral request, a copy of any or all of the documents incorporated by reference, including exhibits to these documents. You should direct any requests for documents to:

<div align='center'>Waste Connections, Inc. 
 Attn: Investor Relations 
 3 Waterway Square Place, Suite 110 
 The Woodlands, TX 77380 
 (832) 442-2200

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### WHERE YOU CAN FIND MORE INFORMATION
We file annual, quarterly, and current reports, proxy statements and other information with the SEC. Our filings with the SEC are available to the public at the SEC’s website at http://www.sec.gov. Certain of our filings with the SEC are available on our website at http://www.wasteconnections.com. Information contained on our website is not and should not be deemed a part of this prospectus supplement, the accompanying base prospectus or any other report or filing filed with the SEC.

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### PROSPECTUS

#### Waste Connections, Inc.

#### Debt Securities
**We may from time to time offer, in one or more series, separately or together, and in amounts, at prices and on terms to be set forth in one or more supplements to this prospectus, debt securities, which may consist of debentures, notes, or other types of debt.

We refer to the debt securities registered hereunder collectively as the “securities” or “debt securities” in this prospectus. The specific terms of each series of the securities will be set forth in the applicable prospectus supplement and will include, where applicable, the specific