Berkshire Hathaway (NYSE: BRK-A) (NYSE: BRK-B) reported that operating earnings, a figure which excludes volatile investment gains and derivative fluctuations, declined 11% to $4.1 billion in the second quarter compared to the year-ago period. Net income, which includes investment gains, fell 15% to $4.3 billion. A drop in insurance underwriting profit led the decline in operating earnings and net income.