Shares of H&M surged 17% on Monday boosting the wealth of Chairman Stefan Persson after reports that he was considering taking the Swedish fashion retailer private. Persson, the 70-year-old son of the company's founder, saw his fortune increase by nearly $2 billion to $15.9 billion. His younger sister Lottie Tham's wealth surged by almost $250 million to $2.6 billion.