Apple Online StoreWal-Mart has dropped to fourth most valuable U.S. company as they were passed by new #3 Apple Inc. in morning NASDAQ trading.

Wal-Mart (WMT) currently has a market value of US$205.31 billion.

Apple (AAPL), currently up $1.21, or 0.54%, per share to $226.71, now has a market value of $205.58 billion.

#1 on the list is Exxon Mobil (XOM) at $315.10B, followed by Microsoft (MSFT) at $256.36B. #5 is Berkshire Hathaway (BRKA) at $202.87B.