Speculator

Speculator: "A person who trades (i.e. derivatives, commodities, bonds, equities or currencies) with a higher-than-average risk, in return for a higher-than-average profit potential. Speculators take large risks, especially with respect to anticipating future price movements, or gambling, in the hopes of making quick, large gains. Investopedia Says... Speculators are typically sophisticated, high risk-taking investors with expertise in the market(s) to which they are trading and will usually use highly leveraged investments such as futures and options."