Koch Brothers, Walton Heirs, Warren Buffett, Bill Gates and Other US Billionaires Lost More Than $17B In Thursday Stock Market Rout

The U.S. stock market had its worst day in months on Thursday, falling more than 300 points and wiping out all of the month's previous gains. U.S. billionaires also felt the pain, and according to calculations by Bloomberg News, the wealthiest Americans lost $17.2 billion of nominal wealth when the dust had settled. Here, according to Bloomberg, is how some of the wealthy fared.