Rishi Bajaj, Toby Symonds and Steve Tesoriere are bullish on Vocus, Inc. (NASDAQ: VOCS ). As reported in a recent filing with the Securities and Exchange Commission, their fund, Altai Capital, has increased its holding of the stock by a little under 1 million shares, taking it to 2.5 million shares. This new position accounts for 11.6% of the total number of Vocus shares outstanding and, given the current market price of $13.34 per share, Altai's stake is worth approximately $32.8 million. Ahmet Okumus is also keeping an eye on Vocus, Inc. (NASDAQ:VOCS). According to its latest 13F report, Okumus Fund Management, holds 4.9 million shares valued at $56 million, the largest position among the hedge funds we track. Jim Simons and his fund, Renaissance Technologies, also have a stake in this company, but have chosen to limit their exposure. During the previous quarter, Renaissance almost halved its position to 259,700 shares reportedly worth $3.0 million.