https://www.nasdaq.com/articles/global-markets-oil-skids-on-oversupply-fears-u.s.-stock-futures-jump-2020-04-05
The Top 30 Volume stocks were mainly blue chips and many of them were flashing consistently in the Top Volume for sometime as many traders/institutions were trading all the blue chips. In times like this, it's only the blue chips reigns while nothing else matters. Study the Top Volume as there are plenty of stocks for trading in/out. I already fished out a few, have you?
Ronald K - Market Psychologist - A Stock Market Opportunist