Billionaire investor Carl Icahn reported that he had increased his stake in Motorola to 144.1 million shares from 115.6 million shares the prior quarter. Meanwhile, George Soros raised his stake in Wall Street firm Lehman Brothers to 9.5 million shares.

For the first time in a long time, it looked as if oil was going to stay out of the market headlines.  No such luck. 

Shoe maker Crocs slashed its first-quarter and full-year earnings and sales outlooks on Monday, citing fewer retail orders and costs from a Canadian factory closure, sending its shares down 27 percent.

Downgrades in the financial sector dragged stocks lower today, causing a three-digit drop in the Dow.  To help investors protect their portfolios, CNBC enlisted the help of market experts.

Crocs shares skidded in after-hours trading after the maker of colorful plastic shoes reported a huge jump in profit but issued a weaker-than-expected outlook for 2008.