Zuckerberg Gains $3.2 Billion as Facebook Soars on Mobile

Facebook Inc.’s three billionaire co-founders added $4.5 billion to their collective net worth yesterday after the world’s largest social-networking company closed at a record.

Mark Zuckerberg, the company’s 29-year-old chief executive officer, gained $3.2 billion, elevating his fortune to $27.4 billion, according to the Bloomberg Billionaires Index. He added $12.4 billion to his net worth in 2013.