quarter of 2022, which included $25.1 million primarily in impairments and other operating items and transaction-related expenses. Net income in the third quarter was $229.0 million, or $0.89 per share on a diluted basis of 258.2 million shares. In the year ago period, the Company reported net income of $236.9 million, or $0.92 per share on a diluted basis of 257.9 million shares.
Adjusted net income(b) in the third quarter was $303.1 million, or $1.17 per diluted share, versus $284.9 million, or $1.10 per diluted share, in the prior year period. Adjusted EBITDA(b) in the third quarter was $671.2 million, as compared to $588.1 million in the prior year period. Adjusted net income, adjusted net income per diluted share and adjusted EBITDA, all non-GAAP measures, primarily exclude impairments and acquisition-related items, as reflected in the detailed reconciliations in the attached tables.
Nine Months Year to Date Results
For the nine months ended September 30, 2023, revenue was $5.986 billion, up from $5.343 billion in the year ago period. Operating income, which included $91.3 million primarily attributable to impairments and other operating items, executive separation costs, and transaction-related expenses, was $1.012 billion, as compared to operating income of $930.2 million in the prior year period, which included $38.5 million primarily attributable to impairments and other operating items and transaction-related expenses.
Net income for the nine months ended September 30, 2023 was $636.0 million, or $2.46 per share on a diluted basis of 258.1 million shares. In the year ago period, the Company reported net income of $641.3 million, or $2.49 per share on a diluted basis of 258.1 million shares.
Adjusted net income(b) for the nine months ended September 30, 2023 was $795.8 million, or $3.08 per diluted share, compared to $755.5 million, or $2.93 per diluted share, in the year ago period. Adjusted EBITDA(b) for the nine months ended September 30, 2023 was $1.867 billion, as compared to $1.657 billion in the prior year period.
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(a) All references to "Net income" refer to the financial statement line item "Net income attributable to Waste Connections"
(b) A non-GAAP measure; see accompanying Non-GAAP Reconciliation Schedule
Q3 2023 Earnings Conference Call
Waste Connections will be hosting a conference call related to third quarter earnings on October 26th at 8:30 A.M. Eastern Time. A live audio webcast of the conference call can be accessed by visiting investors.wasteconnections.com and selecting “News & Events” from the website menu. Alternatively, conference call participants can preregister by clicking here. Registered participants will receive dial-in instructions and a personalized code for entry to the conference call. A replay of the conference call will be available until November 2, 2023, by calling 877-344-7529 (within North America) or 412-317-0088 (international) and entering Passcode #5793196.
Waste Connections will be filing a Form 8-K on EDGAR and on SEDAR (as an "Other" document) prior to markets opening on October 26th, providing the Company's fourth quarter 2023 outlook for revenue, price plus volume growth for solid waste, and adjusted EBITDA(b).
About Waste Connections
Waste Connections (wasteconnections.com) 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. The Company serves approximately nine million residential, commercial and industrial customers in mostly exclusive and secondary markets across 44 states in the U.S. and six provinces in Canada. Waste Connections also provides non-hazardous oilfield waste treatment, recovery and disposal services in several basins across the U.S., as well as intermodal services for the movement of cargo and solid waste containers in the Pacific Northwest. Waste Connections views its Environmental, Social and Governance (“ESG”) efforts as integral to its business, with initiatives consistent with its 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. For more information and updates on our progress towards targeted achievement, visit wasteconnections.com/sustainability.