Company: WCN
Filing Date: 2025-05-30
Form Type: 424B5
Source: 0001104659-25-054854
Chunk: 1

Company: Waste Connections, Inc.
Filing Date: 2025-05-30
Form: 424B5
Chunk 1
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 ​ 
 ​ | Total Notes 
 ​           | ​ |           ​ | ​ | ​ 
 ​ |
|:------------------------------------|:--|:--|:---------|:--|:--------|:--|:--|:--|:------------|:--|------------:|:--|:--|
| Price to public(1)                  | ​ | ​ | ​        | ​ | 99.874% | ​ | ​ | ​ | ​           | $ | 499,370,000 | ​ | ​ |
| Underwriting discount(2)            | ​ | ​ | ​        | ​ | 0.650%  | ​ | ​ | ​ | ​           | $ |   3,250,000 | ​ | ​ |
| Proceeds, before expenses, to us(1) | ​ | ​ | ​        | ​ | 99.224% | ​ | ​ | ​ | ​           | $ | 496,120,000 | ​ | ​ |

(1) Plus accrued interest from June 4, 2025, if settlement occurs after that date. (2) For additional underwriting compensation information, please see “Underwriting (Conflicts of Interest).” Neither the United States Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying base prospectus is truthful or complete. Any representation to the contrary is a criminal offense. The Notes are a new issue of securities with no established trading market. We do not intend to list the Notes on any securities exchange. The Notes will be ready for delivery in book-entry form only through the facilities of The Depository Trust Company (“DTC”) for the accounts of its participants, including Euroclear Bank S.A./N.V., as operator of the Euroclear System, and Clearstream Banking, société anonyme , on or about June 4, 2025. Joint Book-Running Managers

| ​ | BofA Securities | ​ | ​ | J.P. Morgan | ​ | ​ | PNC Capital Markets LLC | ​ | ​ | Truist Securities | ​ |

| ​ | Mizuho | ​ | ​ | Scotiabank | ​ | ​ | TD Securities | ​ | ​ | US Bancorp | ​ | ​ | CIBC Capital Markets | ​ |

Co-Managers

| ​ | Huntington Capital Markets | ​ | ​ | Fifth Third Securities | ​ | ​ | Zions Capital Markets