Stock options granted at the depths of the financial crisis have yielded billions of dollars for employees at some of the biggest U.S. banks, while others saw the promise of massive payouts vanish as shares of their firms languished. Goldman Sachs Group Inc., Wells Fargo & Co. and JPMorgan Chase & Co. employees reaped about $12.5 billion from stock options exercised in the decade since the collapse of Lehman Brothers Holdings Inc., as some bank stocks rebounded smartly. At Morgan Stanley, Bank of America Corp. and Citigroup Inc., millions of options were canceled or expired worthless amid fallout from the worst ... (full story)