Dow Futures is a stock market index futures contract traded on the Chicago Mercantile Exchange`s Globex electronic trading platform. Dow Futures is based off the Dow 30 stock index. The Dow 30 is a price-weighted average of 30 significant stocks traded on the New York Stock Exchange (NYSE) and the NASDAQ. There are three types of Dow futures, the E-mini Dow, DJIA and Big Dow DJIA. The E-mini is the most popular.