Waste Connections, Inc. 10-Q

Item 5. Other Information Rule 10b5-1 Trading Plans. During the quarter ended June 30, 2025, none of our directors or officers adopted or terminated a " Rule 10b5-1 trading arrangement" or " non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K. 61 Table of Contents Item 6. Exhibits Exhibit Number Description of Exhibits 3.1 ​ Articles of Amendment (incorporated by reference to Exhibit 3.1 of the Registrant’s Form 8-K filed on May 26, 2017) 3.2 ​ Articles of Amalgamation (incorporated by reference to Exhibit 3.2 of the Registrant’s Form 8-K filed on June 7, 2016) 3.3 ​ Articles of Amendment (incorporated by reference to Exhibit 3.1 of the Registrant’s Form 8-K filed on June 7, 2016) 3.4 ​ By-law No. 1 of the Registrant (incorporated by reference to Exhibit 3.3 of the Registrant’s Form 8-K filed on June 7, 2016) 4.1 ​ Amendment No. 1 to Revolving Credit Agreement, dated as of May 23, 2025 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on May 27, 2025) 4.2 ​ Tenth Supplemental Indenture, dated as of June 4, 2025, by and between Waste Connections, Inc. and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.2 to the Company’s Current Report on Form 8-K filed with the SEC on June 4, 2025) 10.1 ​ Separation Benefits Plan Participation Letter Agreement by and between Waste Connections US, Inc. and Derek Tan, effective May 19, 2025 (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed with the SEC on May 20, 2025) 10.2 ​ Separation Benefits Plan Participation Letter Agreement by and between Waste Connections US, Inc. and Matthew S. Black, effective May 19, 2025 31.1 ​ Certification of Principal Executive Officer pursuant to Exchange Act Rules 13a-14(a)/15d-14(a) 31.2 ​ Certification of Principal Financial Officer pursuant to Exchange Act Rules 13a-14(a)/15d-14(a) 32.1 ​ Certification of Principal Executive Officer pursuant to 18 U.S.C. §1350 32.2 ​ Certification of Principal Financial Officer pursuant to 18 U.S.C. §1350 101.INS ​ The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document 101.SCH ​ XBRL Taxonomy Extension Schema Document 101.CAL ​ XBRL Taxonomy Extension Calculation Linkbase Document 101.LAB ​ XBRL Taxonomy Extension Labels Linkbase Document 101.PRE ​ XBRL Taxonomy Extension Presentation Linkbase Document 101.DEF ​ XBRL Taxonomy Extension Definition Linkbase Document 104 ​ Cover Page Interactive Data File – The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document. ​ ​ 62 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ​ ​ ​ ​ WASTE CONNECTIONS, INC. ​ ​ Date: July 24, 2025 BY: /s/ Ronald J. Mittelstaedt ​ ​ Ronald J. Mittelstaedt ​ ​ President and Chief Executive Officer ​ ​ Date: July 24, 2025 BY: /s/ Mary Anne Whitney ​ ​ Mary Anne Whitney ​ ​ Executive Vice President and Chief Financial Officer ​ ​ ​ 63