1. Praxair ( PX) Company Profile: Praxair produces gases and high-performance surface coatings. SAC Capital's Investment: Praxair was Cohen's biggest new buy in the third quarter. His hedge fund picked up 1.1 million shares that were worth $106 million as of Sept. 30. Share Price Performance: Praxair shares are up 6% this year and more than 8% since Sept. 30 >>To see these stocks in action, visit the 10 Investments Billionaire Steven Cohen Is Making Now 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: email@example.com.