BALTIMORE ( Stockpickr) -- Economic fundamentals re-entered the picture for investors this week as the euro-zone debt crisis continues to heat up. While exuberant investors pushed equities higher last week, moving broad-based indexes to 52-week highs, this week's downgrade of Portuguese sovereign debt and the still-unfolding issues in Greece are starting to take their toll on the market.But that shouldn't keep us from profitable trades. As we do every Thursday, let's take a look at how Wall Street's biggest names are trading technically. Technical analysis uses a stock's price movements to determine where shares are headed in the future. Technical charts are used every day by proprietary trading floors, the street's biggest financial firms and individual investors to get an edge on the market. And according to some sources, skilled technical traders can bank gains as much as 90% of the time. Every week, Stockpickr analyzes the technicals for some of Wall Street's highest-volume stocks and takes a look at how to trade them. Here's this week's look at how some of the biggest names on Wall Street are trading technically.