MasterCard has announced financial results for the fourth quarter of 2012. The company reported net income of $605 million, up 18%, and earnings per diluted share of $4.86, up 21%, in each case versus the year-ago period. Net revenue for the fourth quarter of 2012 was $1.9 billion, a 10% increase versus the same period in 2011. Adjusted for currency, net revenue increased 12%. Worldwide purchase volume during the quarter was up 13% on a local currency basis versus the fourth quarter of 2011, to $727 billion. As of December 31, 2012, the company’s customers had issued 1.9 billion MasterCard and Maestro-branded cards.