Exxon Offers $31 Billion For XTO By: MarketMinute.com Stock News December 14, 2009 at 12:56 PM EST XTO Energy Inc. (NYSE: XTO) was the target of a $31 billion all-stock offer by Exxon Mobil Corp. (NYSE: XOM). Shares of XTO surged $6.19 to $47.69 while Exxon stock tumbled $3.18 to $69.64. Related Stocks: Exxon Mobil