Crude Oil spirals below zero in devastating day for global industry

The move was so violent and shocking that many traders struggled to explain it. They grasped wildly at possible causes all day long — had some big firm got caught wrong-footed? Or were inexperienced retail investors flummoxed by a market quirk? — but had no tangible evidence of anything to point to.

Read moreCrude Oil spirals below zero in devastating day for global industry