144 0001130416 XXXXXXXX LIVE 0001318220 WASTE CONNECTIONS, INC. 001-34370 6220 Hwy 7, Suite 600 Woodbridge A6 L4H4G3 (905) 532-7510 JAMES AND MICHELLE LITTLE REV LIV TRUST Officer Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

2000 370650.00 258063121 11/11/2024 NYSE Common 02/14/2023 Restricted stock vesting under a registered plan Issuer N 2000 02/14/2023 Not Applicable Y Sales that were executed on November 11, 2024 are being reported on this Form 144 filed on November 12, 2024 given the EDGAR system was not accepting filings on November 11, 2024 in observance of the federal holiday. 11/11/2024 /s/ James Little, Trustee