Goldman Sachs (GS) said Wednesday morning that it earned nearly $2.9 billion in the last three months of 2012, more than $1 billion more than analysts were expecting. Earnings per share more than tripled from a year ago to $5.60, which was also a lot more than analysts were expecting. For all of 2012, Goldman said it earned $7.2 billion, up from $2.5 billion a year earlier. The stock rose nearly 2% in pre-market trading.