Compuware Corporation NASDAQ: CPWR, Norwegian Cruise Line Holdings Ltd NASDAQ: NCLH and ACADIA Pharmaceuticals Inc. NASDAQ: ACAD are among today's top gainers on the stock market midday. Posting notable losses are CONN’S, Inc. NASDAQ: CONN, Adecoagro SA NYSE: AGRO and Allied Nevada Gold Corp. NYSEMKT: ANV. Compuware Climbs Compuware Corporation ( CPWR) reached midday with a +12.33% gain following news that it has agreed to a $2.5 billion private equity firm buyout. Billionaire hedge fund manager John Paulson has held 14.25 million CPWR shares since the fourth quarter of 2013. Norwegian Cruise Line Holdings Ltd ( NCLH) surged +11.98% after announcing plans to buy Prestige Cruises which operates Oceania and Regent Seven Seas in a deal valued at $3 billion. NCLH is up +4.6% year-to-date. Up 9.17%, ACADIA Pharmaceuticals Inc. ( ACAD) had a strong start to the day and week as well. Today, the company announced that the FDA has granted breakthrough therapy designation to one of its products. The biopharmaceutical company has been in the Farallon Capital portfolio since the first quarter of the year. Its price has climbed +27.93% over the past three months. Conn’s Inc. Plummets on Missed EPS Mark The share price of CONN’S, Inc. ( CONN) plummeted -30.78% early in the day after the company missed second quarter EPS expectations by $0.25. A home appliances and consumer electronics retailer, Conn's is down -60.35% YTD. Billionaire investor David Einhorn initiated a position in the company in Q1 and increased it slightly to 3.5 million shares in Q2. Adecoagro SA ( AGRO) posted a loss of -7.41% midday. The South American agricultural company, which operates in Argentina, Brazil and Uruguay, is a long-time George Soros pick. As of the second quarter of this year, the billionaire holds 25.9 million AGRO shares. Despite today's decline, the company's share price is up +8.28% YTD. It hit oversold territory late last month. Allied Nevada Gold Corp. NYSEMKT:ANV dipped -6.94% early in the day. The gold company has been in John Paulson's portfolio across several quarters, and George Soros initiated a position in Q2 2014.