While CME doesn’t specify how much money it makes from individual contracts, UBS analysts estimate that about 14% of its revenue this year will come from energy, which includes oil, natural gas and other contracts. Last year CME posted $4.9 billion in total revenue.
“If the ETF is tied to the futures and the futures go negative while the ETF can’t, there will be dislocations,” Mr. Duffy said. “People should know that before they invest in these instruments.”
https://www.wsj.com/articles/negative-oil-prices-pose-headache-for-futures-giant-cme-11587547802