Waste Connections, Inc.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934 (Amendment No. )

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Preliminary Proxy Statement

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Definitive Proxy Statement

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Definitive Additional Materials

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Soliciting Material under §240.14a-12

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11.

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Who We Are

Waste Connections, Inc. is an integrated solid waste services company that provides non-hazardous waste collection, transfer and disposal services, including by rail, along with resource recovery primarily through recycling and renewable fuels generation. We serve approximately nine million residential, commercial and industrial customers across 46 states in the U.S. and six provinces in Canada. We also provide non-hazardous oilfield waste treatment, recovery and disposal services in several basins across the U.S. and Canada, as well as intermodal services for the movement of cargo and solid waste containers in the Pacific Northwest. We view our environmental, social and governance (“ESG”) efforts as integral to our business, with initiatives consistent with our objective of long-term value creation and focused on reducing emissions, increasing resource recovery of both recyclable commodities and clean energy fuels, reducing reliance on off-site disposal for landfill leachate, further improving safety and enhancing employee engagement. Visit wasteconnections.com/sustainability for more information and updates on our progress towards targeted achievement.

2025 by the Numbers

Our Values

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(1)

All references to “Net income” in this Proxy Statement refer to the financial statement line item “Net income attributable to Waste Connections”. This Proxy Statement includes certain measures that do not have a standardized meaning and are not defined by GAAP and, therefore, may not be comparable to similar measures used by other companies. We present adjusted EBITDA, a non-GAAP financial measure, supplementally because it is widely used by investors as a performance and valuation measure in the solid waste industry. We also present adjusted free cash flow, a non-GAAP financial measure, because it is widely used by investors as a liquidity measure in the solid waste industry. Adjusted EBITDA and adjusted free cash flow are also important factors used by our Board’s Compensation Committee in setting executive compensation and aligning pay with performance. In addition, we present Leverage Ratio (total debt to EBITDA), a non-GAAP ratio, supplementally because it is used for the purposes of calculating financial covenants under our revolving credit agreement with Bank of America, N.A. Management also uses Leverage Ratio as one of the principal measures to evaluate and monitor the indebtedness of the Company relative to its ability to generate income to service such debt. These measures are not a substitute for, and should be used in conjunction with, GAAP financial measures. This section should be read in conjunction with information presented in our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, under the heading “Non-GAAP Financial Measures”, and in the Appendix to the Compensation Discussion and Analysis section of this Proxy Statement, which together include a reconciliation of the non-GAAP financial measures used in this Proxy Statement to GAAP financial measures.

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Ronald J. Mittelstaedt

President, Chief Executive Officer and

Director

Dear Fellow Shareholders,

You are invited to attend the Annual Meeting (the “Meeting”) of Shareholders of Waste Connections, Inc. (“Waste Connections” or the “Company”) on Friday, May 15, 2026, at 8:00 a.m. (Central Time). The Meeting will be held at our principal administrative offices located at 3 Waterway Square Place, Suite 110, The Woodlands, Texas 77380.

We’re proud of our accomplishments in 2025, beginning with historic record levels of performance in safety, our most important operating value. In addition, we achieved continuous improvement in employee retention to multi-year highs and delivered outsized margin expansion, while integrating another active year of solid waste-focused acquisitions and investing in human capital and technology-driven initiatives.

Most notably, we provided consistent, projectable results in an otherwise uncertain and challenging macroeconomic environment, validating the resilience of our strategy, the quality of our assets and the integrity of Waste Connections’ operating model regardless of the economic or political backdrop. At Waste Connections, we’re committed to a differentiated strategy that has driven industry-leading results and served us well since the Company’s inception 28 years ago.

Our 2025 financial and operating performance, human capital and ESG updates, and the matters to be acted upon at the Meeting, are described in the accompanying Notice of Meeting and Management Information Circular and Proxy Statement. As always, we look forward to connecting with our shareholders and responding to any questions you may have about the Company.

Thank you for your ongoing support and continued interest in Waste Connections.

RONALD J. MITTELSTAEDT

President, Chief Executive Officer and Director

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Notice of 2026 Annual

Meeting of Shareholders

Meeting Logistics

Meeting Agenda

By Order of the Board of Directors

PATRICK J. SHEA​

EXECUTIVE VICE PRESIDENT,

GENERAL COUNSEL AND SECRETARY

APRIL 2, 2026

IMPORTANT NOTICE REGARDING THE

AVAILABILITY OF PROXY MATERIALS

This Notice of Meeting and the accompanying Management Information Circular and Proxy Statement and related solicitation materials in respect of the Meeting and our 2025 Annual Report to Shareholders (which includes our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which was filed with the U.S. Securities and Exchange Commission and the securities commissions or similar regulatory authorities in Canada on February 12, 2026), are available at investors.wasteconnections.com.

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Management Information Circular and Proxy Statement

for the 2026 Annual Meeting of Shareholders

About this Management Information Circular and Proxy Statement

We sent you this Management Information Circular and Proxy Statement (this “Proxy Statement”) because our management is soliciting your proxy to vote your Common Shares (as defined below) at the Annual Meeting (the “Meeting”) of shareholders of Waste Connections, Inc. (“Waste Connections,” the “Company,” “we,” “us,” or “our”) to be held at the Company’s principal administrative offices located at 3 Waterway Square Place, Suite 110, The Woodlands, Texas 77380 on May 15, 2026, at 8:00 a.m. (Central Time).

This Proxy Statement includes information that we are required to provide to you under the rules of the U.S. Securities and Exchange Commission (“SEC”) and applicable corporate and securities laws in Canada, and that is designed to assist you in voting your Common Shares in the capital of the Company (“Common Shares”).

We will bear the costs of soliciting proxies from our shareholders. In addition to soliciting proxies by mail, our directors, officers, and employees, without receiving additional compensation, may solicit proxies by telephone, in person or in any other manner permitted by applicable laws. We may also engage the services of a professional proxy solicitation firm to aid in the solicitation of proxies from certain brokers, bank nominees and other institutional owners. Our costs for such services, if retained, will not be material.

Under the SEC rules and applicable Canadian securities laws that allow companies to furnish proxy materials to shareholders over the Internet, we have elected to deliver our proxy materials (defined below) to the majority of our shareholders over the Internet. This delivery process allows us to provide shareholders with the information they need electronically, which is more environmentally friendly and reduces our costs to print and distribute these materials. On or about April 2, 2026, we will mail to our shareholders a Notice of Internet Availability of Proxy Materials (the “proxy notice”) containing instructions on how to access this Proxy Statement for the Meeting and our 2025 Annual Report to Shareholders (which includes our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, which was filed with the SEC and the securities commissions or similar regulatory authorities in Canada on February 12, 2026) (referred to collectively as the “proxy materials”). The proxy notice will also provide instructions on how to vote online or by telephone and will include instructions on how to receive a paper copy of the proxy materials by mail. On or about April 2, 2026, we will also commence mailing this Proxy Statement and a proxy card to certain shareholders.

We are permitted under applicable securities laws to deliver a single proxy notice to one address shared by two or more United States shareholders. This delivery method is referred to as “householding” and helps reduce our printing costs and postage fees. Under this procedure, we deliver a single package containing proxy notices to multiple United States shareholders who share an address. If you do not wish to participate in householding in the future and prefer to receive separate proxy notices, please contact: Broadridge Financial Solutions, Attention: Householding Department, 51 Mercedes Way, Edgewood, NY 11717, telephone 1-800-542-1061. If you are currently receiving multiple proxy notices and wish to receive only one proxy notice for your household, please contact Broadridge Financial Solutions. If you wish to receive a separate copy of this Proxy Statement, our 2025 Annual Report to Shareholders, and our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, please send a written request to our Secretary or Investor Relations at our principal administrative offices located at 3 Waterway Square Place, Suite 110, The Woodlands, Texas 77380.

Cautionary Note Regarding Forward-Looking Statements

This Proxy Statement contains forward-looking statements within the meaning of the safe harbor provisions of the U.S. Private Securities Litigation Reform Act of 1995 (“PSLRA”), including “forward-looking information” within the meaning of applicable Canadian securities laws. These forward-looking statements are neither historical facts nor assurances of future performance and reflect our current beliefs and expectations regarding future events and operating performance of the Company. These forward-looking statements are often identified by the words “may,” “might,” “believes,” “thinks,” “expects,” “estimates,” “continues,” “intends,” “anticipates,” “will,” or other words or phrases of similar meaning. All of the forward-looking statements included in this Proxy Statement are made pursuant to the safe harbor provisions of the PSLRA and applicable Canadian securities laws. Forward-looking statements involve risks and uncertainties. Important factors that could cause actual results to differ, possibly materially, from those indicated by the forward-looking statements include, but are not limited to, risk factors detailed from time to time in our filings with the SEC and the securities commissions or similar regulatory authorities in Canada. You should not place undue reliance on forward-looking statements, which speak only as of the date of this Proxy Statement. We undertake no obligation to update the forward-looking statements set forth in this Proxy Statement, whether as a result of new information, future events, or otherwise, unless required by applicable securities laws.

Management Information Circular and Proxy Statement for the 2026 Annual Meeting of Shareholders

Currency Exchange Rate Data

Unless otherwise indicated, all dollar amounts in this Proxy Statement are expressed in U.S. dollars. The following table shows the average of the exchange rates for each period indicated. The information is based upon the average daily exchange rates provided by the Bank of Canada.

Financial Statements

A more detailed description of the Company’s fiscal year 2025 operating and financial performance, including a reconciliation of non-GAAP financial measures, and a graphical representation of the five-year Total Shareholder Returns or TSRs for the Company, S&P 500, S&P/TSX 60 (“TSX 60”) and the Dow Jones U.S. Waste & Disposal Services (“DJ Waste”) Indices, can be found on pages 52 to 76 and page 51, respectively, of our Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the SEC and the securities commissions or similar regulatory authorities in Canada on February 12, 2026, and available on our website at https://investors.wasteconnections.com, on SEDAR+ at www.sedarplus.ca, on EDGAR at www.sec.gov, and in print, free of charge, to any shareholder who requests in writing a copy by contacting our Secretary or Investor Relations at our principal administrative offices located at 3 Waterway Square Place, Suite 110, The Woodlands, Texas 77380.