Berkshire Hathaway, the insurance-focused conglomerate owned by Warren Buffett, increases its stakes in Wal-Mart Stores and Wells Fargo during the third quarter.

A rash of insider activity is often a clue to that company's prospects.

NRG Energy paid about $10 million for Bluewater Wind, an energy company that holds the only power purchase agreement for an offshore wind farm in the U.S.

Berkshire Hathaway’s deal to buy Burlington Northern Santa Fe is basically a huge bet on coal, a fuel that powers Warren Buffett’s power plants and plays a major role in the railroad business.

The top performing mid cap stocks in September 2009 contained a few surprises from sectors that had been left for dead by investors.

Plug-in cars, charging stations point toward lower emissions, cleaner air

Companies to focus on making switch to electric vehicles easier