Warren Buffett's Berkshire Hathaway quietly made a $8.2 billion acquisition that taps into the electric-vehicle boom

• Warren Buffett's Berkshire Hathaway paid $8.2 billion to acquire Pilot Travel Centers in January.
• The investor's company raised its stake in the truck-stop chain from 38.6% to 80%.
• Pilot has partnered with GM and Volvo to develop charging networks for electric vehicles.

Warren Buffett's Berkshire Hathaway quietly made a multibillion-dollar acquisition in January, the company's annual report shows. The deal promises to boost its exposure to the booming electric-vehicle industry.