Check out which companies are making headlines after the bell Monday:
Lululemon - The yoga apparel maker said it expects same-store sales to grow "in the high single digits" and raised its fourth-quarter earnings guidance to 74 cents a share, in line with Wall Street estimates. But the company said it expects to report sales of between $475 million and $480 million, missing current expectations for $489 million. Shares tumbled in extended-hours trading.
(Read More: Stocks End Flat; Apple Near $500, Dell Soars)
Dell - The company continued to edge higher in extended-hours trading after surging nearly 13 percent in the regular trading session amid market buzz that the computer hardware maker is in talks with private-equity firms over a potential buyout.
JPMorgan - The investment banking giant has been ordered to take steps to correct poor risk management that led to its trading loss last year of more than $6 billion. Shares dipped in extended-hours trading.
Apple - The tech giant edged higher in extended-hours trading after tumbling near $500 a share in the regular session following reports that the company cut orders for parts on its iPhone 5 due to weak demand. (Read More: Apple Trades Near $500 as Investors Dump Shares)
RadioShack - The consumer electronics retailer said it has ended its partnership with Target, which allowed RadioShack to manage Target's post-paid mobility business in 1,500 Target stores. Shares of RadioShack gained in extended-hours trading.
Brocade - The networking hardware and software company named Lloyd Carney as its CEO effective immediately. Carney previously served as the CEO of Micromuse, a software company that was acquired by IBM in 2005.
Palo Alto Networks - Jefferies initiated coverage of the network security company with a "hold" rating and a $59 price target.
American Water Works - The utilities company said its CFO Ellen Wolf to retire in the first half of 2013. Shares were unchanged in extended-hours trading.