Apple's market cap -- a measure of the value of a company -- is now below $400 billion.
The company passed the milestone as Apple's shares fell 2 percent in trading this morning and the decline continued through the day to a closing price of $420.05, a drop of 2.4 percent from Friday's closing price. At that share price, Apple's market cap is now $394.45 billion. The company's valuation hasn't been that low since late 2011.
Apple's share price has been on a steady decline over the last several months. … Read more