A mode of trading that involves taking a long position in the volatility of a basket or index of underlying...

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...