(Mark One) ☑QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934For the quarterly period ended March 31, 2026Or☐TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACTOF 1934For the transition period fromtoCommission file number 1-34370 WASTE CONNECTIONS, INC.(Exact name of registrant as specified in its charter)Ontario, Canada(State or other jurisdiction of incorporation or organization)98-1202763(I.R.S. Employer Identification No.)6220 Hwy 7, Suite 600WoodbridgeOntario L4H 4G3Canada(Address of principal executive offices)(905) 532-7510(Registrant’s telephone number, including area code)Securities registered pursuant to Section 12(b) of the Act: Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the SecuritiesExchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports);and (2) has been subject to such filing requirements for the past 90 days. YesNo◻ Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuantto Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit suchfiles). Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reportingcompany, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reportingcompany” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one): If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period forcomplying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.◻ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). WASTE CONNECTIONS,INC.FORM10-Q TABLE OF CONTENTS PART I – FINANCIAL INFORMATION (unaudited)Item 1.Financial StatementsCondensed Consolidated Balance Sheets1Condensed Consolidated Statements of Net Income2Condensed Consolidated Statements of Comprehensive Income3Condensed Consolidated Statements of Equity4Condensed Consolidated Statements of Cash Flows6Notes to Condensed Consolidated Financial Statements7Item 2.Management’s Discussion and Analysis of Financial Condition and Results ofOperations35Item 3.Quantitative and Qualitative Disclosures About Market Risk53Item 4.Controls and Procedures55PART II – OTHER INFORMATIONItem 1.Legal Proceedings56Item 2.Unregistered Sales of Equity Securities and Use of Proceeds56Item 5.Other Information56Item 6.Exhibits57Signatures58 PARTI– FINANCIAL INFORMATIONItem1. Financial StatementsWASTE CONNECTIONS,INC.CONDENSED CONSOLIDATED BALANCE SHEETS(Unaudited)(In thousands of U.S. dollars, except share and per share amounts) WASTE CONNECTIONS,INC.CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME(Unaudited)(In thousands of U.S. dollars, except share and per share amounts) Shares used in the per share calculations: WASTE CONNECTIONS,INC.CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME(Unaudited)(In thousands of U.S. dollars) WASTE CONNECTIONS, INC.CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS(Unaudited)(In thousands of U.S. dollars) Payments for acquisitions, net of cash acquired(63,087)(380,417)Capital expenditures for property and equipment(296,596)(212,455)Proceeds from disposal of assets1,779969Other2,203(11,308)Net cash used in investing activities(355,701)(603,211) WASTE CONNECTIONS, INC.NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS(Unaudited)(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE AMOUNTS ORAS OTHERWISE NOTED) 1.BASIS OF PRESENTATION AND SUMMARY The accompanying condensed consolidated financial statements relate to Waste Connections,Inc. andits subsidiaries (the “Company”) for the three-month periods ended March 31, 2026 and 2025. In theopinion of management, the accompanying balance sheets and related interim statements of net income,comprehensive income, cash flows and equity include all adjustments, consisting only of normal recurringitems, necessary for their fair statement in conformity with U.S. generally accepted accounting principles(“GAAP”). Preparing financial statements requires management to make estimates and assumptions thataffect the reported amounts of assets, liabilities, revenues and expenses. Examples include accounting forlandfills, self-insurance accruals, income taxes, allocation of acquisition purchase price, contingentconsideration accruals and asset impairments. An additional area that involves estimation is when theCompany estimates the amount of potential exposure it may have with respect to litigation, claims andassessments in accordance with the accounting gui