400 Richest Americans Saw Wealth Grow 13 Percent To $1.7 Trillion In 2011: The collective wealth of the 400 richest Americans totaled $1.7 trillion in 2011, a 13 percent jump from a year ago, as the stock market reached its highest mark in a decade and real estate rebounded, Forbes announced Wednesday. Microsoft founder Bill Gates led the list of America’s wealthiest with a net worth of $66 [...]/p