Today’s daily gainers are WuXi PharmaTech (Cayman) Inc. (ADR) (NYSE:WX), CVR Refining LP (NYSE:CVRR), Towerstream Corporation (NASDAQ:TWER) and daily losers are Mercury Systems Inc (NASDAQ:MRCY), Micron Technology, Inc. (NASDAQ:MU), The Gap Inc. (NYSE:GPS).

CVR Refining

CVR Refining is today’s top performing stock

The company with today’s best performance is the oil company CVR Refining LP (NYSE:CVRR). The stock was up +8.26%, trading at $24.18. The only stockholder with CVRR stakes, among the billionaires tracked by iBillionaire, is Carl Icahn who holds six million shares. The investor has started this position during 2013 Q1, when he bought four million shares. Over the last quarter Icahn acquired another two million shares, having paid an average price of $28.72.

Following CVR Refining is Wuxi PharmaTech (Cayman) Inc. (ADR) (NYSE:WX). The health stock increased +8.19% today, reaching $29.14. This was a well-received news for Julian Robertson, who holds 829,000 shares, representing 2.38% of his fund. Robertson has made a big gain with this position (+80.61%), since he paid an average price of $16.05 per share.

Last but not least is Towerstream Corporation (NASDAQ:TWER), a telecommunication company, which climbed +6.40% to $2.73. The company represents 0.01% of George Soros’ fund. The billionaire bought 197,000 shares at an average price of $2.37 during last quarter.

Daily Losers

Today’s daily loser is the tech company Mercury Systems Inc (NASDAQ:MRCY), which dropped -12.18%, hitting $9.08. The billionaire affected by this movement is George Soros who owns 1.2 million shares, representing 0.13% of his portfolio. The stockholder has been decreasing his position in this stock, from March 2012 to June 2013 he sold a 33% of his stakes. Soros has paid an average price of $12.94 per share.

The second stock with a major lost is Micron Technology, Inc. (NASDAQ:MU), another tech firm. Today the company performed -8.46%, trading at $16.88. Many of our billionaires has MU stakes, for instance Seth Klarman bought 41.5 million shares (14.79% of his fund) at an average price of $11.72 during last quarter. With 4.2 million assets, MU represents 1.63% of Richard Chilton’s portfolio. Unlike Klarman, Chilton has been holding MU shares for more than 2 years. Nowadays, the billionaire holds 5.5 million shares, acquired at an average price of $8.52.

Finally, the last firm joining our daily loser list is The Gap Inc. (NYSE:GPS), which dipped -7.09%, reaching $36.08, since the retail company reported a decline in its sales in the third quarter. The billionaire Edward Lampert owns 10.3 million shares, representing 14.47% of his holdings. Lampert paid an average price of $19.40 per share. Another investor with a position in GPS is Steve Mandel, who holds 19.1 million shares (3.89% of his fund), having paid $23.48 per share.