Shares in Exxon Mobil have fallen more than 5 percent since the oil company announced its agreement to buy XTO Energy on Dec. 14. Exxon said it would pay $31 billion for the company and would take on $10 billion of XTO debt.

Exxon will create a new unit to produce oil and gas from unconventional sources, based in XTO’s Fort Worth offices in Texas.

14 Dec 2009 -

Stepping on the gas