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.

Bill Gates lost $1 billion.

Warren Buffett lost $1.2 billion

Charles Koch lost $682 million

David Koch lost $682 million

Larry Ellison lost $660 million

Christy Walton lost $604 million

Jim Walton lost $537 million

To read more about American billionaires' losses, click here.