1. Reliance Steel & Aluminum ( RS) Company Profile: Reliance Steel provides metals processing services and operates more than 200 metals service centers in the U.S., Canada, China, Mexico and several other countries. SAC Capital's Investment: Cohen's fund bought 1.2 million shares of Reliance Steel in the fourth quarter, which had a market value of $61.5 million as of Dec. 31. Share Price Performance: After the stock fell 5% in 2011, Reliance Steel shares have rebounded nearly 10% in 2012. >>To see these stocks in action, visit the 10 Best New Stock Ideas by Steven Cohen portfolio on Stockpickr. -- Written by Robert Holmes in Boston. >To contact the writer of this article, click here: Robert Holmes. >To follow Robert Holmes on Twitter, go to http://twitter.com/RobTheStreet. >To submit a news tip, send an email to: firstname.lastname@example.org.