million, or $1.19 per share on a diluted basis of 258.8 million shares. In the year ago period, the Company reported net income of $229.0 million, or $0.89 per share on a diluted basis of 258.2 million shares.
Adjusted net income(b) in the third quarter was $350.0 million, or $1.35 per diluted share, versus $303.1 million, or $1.17 per diluted share, in the prior year period. Adjusted EBITDA(b) in the third quarter was $787.4 million, as compared to $671.2 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, 2024, revenue was $6.659 billion, up from $5.986 billion in the year ago period. Operating income was $1.267 billion, which included $38.2 million primarily attributable to transaction-related expenses, impairments and other operating items and fair value changes to equity awards. This compares to operating income in the prior year period of $1.012 billion, which included $91.3 million primarily attributable to impairments and other operating items, executive separation costs and transaction-related expenses.
Net income for the nine months ended September 30, 2024 was $813.6 million, or $3.15 per share on a diluted basis of 258.6 million shares. In the year ago period, the Company reported net income of $636.0 million, or $2.46 per share on a diluted basis of 258.1 million shares.
Adjusted net income(b) for the nine months ended September 30, 2024 was $938.7 million, or $3.63 per diluted share, compared to $795.8 million, or $3.08 per diluted share, in the year ago period. Adjusted EBITDA(b) for the nine months ended September 30, 2024 was $2.170 billion, as compared to $1.867 billion in the prior year period.
Updated 2024 Outlook
Waste Connections also updated its outlook for 2024, which assumes no change in the current economic environment or underlying economic trends. The Company’s outlook excludes any impact from additional acquisitions that may close during the year, and expensing of transaction-related items. The outlook provided below is forward looking, and actual results may differ materially depending on risks and uncertainties detailed at the end of this release and in our periodic filings with the U.S. Securities and Exchange Commission and the securities commissions or similar regulatory authorities in Canada. Certain components of the outlook for 2024 are subject to quarterly fluctuations. See reconciliations in the attached tables.
| - | Revenue is estimated to be approximately $8.9 billion, up $150 million from our original outlook. |
| - | Net income is estimated to be approximately $1.082 billion, and adjusted EBITDA(b) is estimated to be approximately $2.910 billion, up $50 million from our original outlook. |
| - | Capital expenditures are estimated to be approximately $1.150 billion, in line with our original outlook. |
| - | Net cash provided by operating activities is estimated to be approximately $2.342 billion, and adjusted free cash flow(b) is estimated to be approximately $1.200 billion, in line with our original outlook. |
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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