Many corporations review their business portfolio periodically to determine which operations continue to fit their core strategies. As part of this review, the parent conducts a financial analysis to determine if the business is worth more to shareholders if it is sold and the proceeds either returned to the shareholders or reinvested in opportunities offering higher returns. Weighing the future of certain current businesses with other perceived opportunities, General Electric announced in late 2006 that it was selling its silicone and quartz business for $3.4 billion to private equity firm Apollo Management. GE`s portfolio of companies has been undergoing change since the current CEO, Jeffrey Immelt, took control in September 2001. Since then, GE has completed transactions valued at more than $100 billion in buying and selling various operating units.