EXHIBIT 99.1 Table of Contents Fourth Quarter 2023 Supplemental Financial and Operating Data Page Income Statements 15 Wellhead Volumes and Prices 16 Balance Sheets 17 Cash Flow Statements 18 Non-GAAP Financial Measures 19 Adjusted Net Income (Loss) 20 Net Income Per Share 27 Adjusted Net Income Per Share 31 Cash Flow from Operations and Free Cash Flow 35 Net Debt-to-Total Capitalization Ratio 36 Proved Reserves and Reserve Replacement Data 37 Reserve Replacement Cost Data 38 Income Statements In millions o ...