Free version of Ninja Trader already does that with a free connection to Yahoo. If you must have the data in MT4, then export it from NT and import it into MT4.
However, there are several MT4 brokers that have stock CFDs - ODL, FxPro, BroCo, (Delta?) probably more.
I'm looking for this too. If there aren't any brokers out there that support MT4, does anyone have recommendations for platforms like MT4 that support advanced technical analysis? I'm really in love with the MT4 platform, but if I could find something for analyzing stocks as well that would be amazing.
I don't necessarily need something that will allow me to trade -- just something to analyze real-time data with.