A pattern day trader (PDT) is a regulatory designation for traders who execute four or more day trades over a five-business-day period in a margin account.

Follow the latest Supreme Court news stories and headlines. Get breaking news alerts when you download the ABC News App and subscribe to Supreme Court notifications.

Discover how bridge loans work, their benefits, and risks. Learn how they provide immediate cash flow for real estate deals or business expenses.

Charles Robinson has been a senior writer for Yahoo Sports since 2004, specializing in NFL and investigative reporting. Follow him on Twitter @CharlesRobinson.