KOSMOS ENERGY LTD. Supplemental Quarterly Financial Information (Unaudited) Quarter Ended March 31, June 30, September 30, December 31, (In thousands, except per share data) 2017 Revenues and other income . . . . . . . . . . . . . . . . . . $151,966 $ 146,524 $151,242 $ 187,104 Costs and expenses . . . . . . . . . . . . . . . . . . . . . . . . 158,630 131,252 216,162 308,647 Net loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (28,841) (8,467) (63,405) (122,079) Net loss per share: Basic(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (0.07) (0.02) (0.16) (0.31) Diluted(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (0.07) (0.02) (0.16) (0.31) 2016 Revenues and other income . . . . . . . . . . . . . . . . . . $ 62,133 $ 45,676 $ 66,629 $ 210,917 Costs and expenses . . . . . . . . . . . . . . . . . . . . . . . . 123,148 169,544 118,890 268,337 Net loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (58,993) (108,324) (59,763) (56,700) Net loss per share: Basic(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (0.15) (0.28) (0.15) (0.15) Diluted(1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (0.15) (0.28) (0.15) (0.15) (1) The sum of the quarterly earnings per share information may not add to the annual earnings per share information as a result of rounding. 155