Penn Virginia (PVA) – Billionaire George Soros owns almost 9% of PVA and the company has officially put itself up for sale, hiring an investment bank to find a buyer for the company.Whiting Petroleum (WLL) – Billionaire John Paulson owns more than 6% of Whiting Petroleum. Paulson is an expert at M&A and merger speculation, and Whiting has also officially put itself up for sale, hiring consultants and investment banks to sell the company or assets. ...