Market Cap Leaders: GE at Risk of Falling Out of Top 20

As General Electric continues to fall, the company that once boasted a half trillion dollar market cap, is now at risk of falling out of the Top 20 biggest companies in the S&P 500 . Although up on the open this morning, GE had a market cap of $70.6 billion as of yesterday's close, just behind Intel and ahead of Hewlett-Packard .

Leading the list are Exxon Mobil , Wal-Mart and Microsoft . Here are the Top 25 biggest companies in the S&P as of yesterday's close, according to data from Thomson Reuters: