A day trader who bought hundreds of oil contracts was told he owed $9 million after a trading platform issue meant it failed to show oil's historic plunge below $0
The platform he used, Interactive Brokers, could not display negative prices.
"It's a $113 million mistake on our part," Thomas Peterffy, founder and chairman of Interactive Brokers told Bloomberg in an interview.
He added that customers who suffered losses as a result of the issue will get their money back.