A professional trader who relies on exchange-traded funds (ETFs) to hedge a position or to gain exposure on an intraday...

A brokerage account whose holder is required to immediately make cash payments on purchases and deliveries on sales of securities,...

A brokerage account whose holder is required to immediately make cash payments on purchases and deliveries on sales of securities,...

A regulatory response to a case of extreme volatility in trading.This is meant to stop trading (and irrational buying or...