☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 1‑34370 WASTE CONNECTIONS, INC. Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10‑Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 (Exact name of registrant as specified in its charter) Ontario, Canada (State or othe ...

Company Overview - Waste Connections is the third largest solid waste company in North America, with an enterprise value of approximately $25 billion and assets of around $12 billion[5] - The company focuses on secondary and exclusive markets, leading to sector-leading EBITDA and free cash flow margins[5] - Waste Connections has consistently delivered positive shareholder returns, with 2018 marking the 15th consecutive year of such performance[5] Financial Performance and Outlook - In 2018, Waste Connections reported revenue of $4.923 billion, a 6.3% year-over-year increase, with solid waste pricing growth of approximately 4.5%[26] - Adjusted EBITDA for 2018 was $1.566 billion, representing 31.8% of revenue, a 30 bps increase year-over-year[26] - Adjusted free cash flow for 2018 reached $879.9 million, or 17.9% of revenue, with an EBITDA to FCF conversion rate of 56.2%[26] - The company anticipates 2019 revenue of $5.310 billion, with an adjusted EBITDA of $1.705 billion, or 32.1% of revenue[29] - Waste Connections projects adjusted free cash flow of $950 million for 2019, which is about 17.9% of revenue and over 55% of EBITDA, expecting double-digit adjusted free cash flow per share growth[29] Capital Allocation - Waste Connections actively engages in M&A, with approximately $360 million in total annualized revenue from acquisitions in 2018[26] - The company returned $211.5 million to shareholders through buybacks and dividends in 2018, increasing the quarterly cash dividend by 14.3%[26]

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) þ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR ¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from ___________ to ___________ Commission File No. 1-34370 WASTE CONNECTIONS, INC. (Exact name of registrant as specified in its charter) Ontario, Canada (State or oth ...