What is a Day Trader? A day trader is a speculator who clears the price before the last trading time on the same trading day in a commodity transaction. Day trader Right! A day trader is a speculator who clears the price before the last trading time on the same trading day in a commodity transaction. Introduction IN OTHER LANGUAGES English Čeština Dansk Deutsch Svenska Français Italiano Nederlands Norsk Polski Português Español 日本語 한국어