all or none An order for options or other securities that tells the broker to fill it only if it can be filled in full.
alligator spread Trader jargon for a position idea that looks great based on market conditions except for the fact that brokerage commissions will eat all the profits.
alpha The Greek letter used in many asset pricing models to represent investment performance that did not come from market risk but rather from the investment manager’s skill.
American option An option that can be executed at any time between its purchase date and its expiration date.
arbitrage Literally means “riskless profit”; used to take advantage of a mispricing in the market by buying the underpriced asset and simultaneously selling the overpriced ...