Warren Buffett’s Berkshire Hathaway revealed a new stake in troubled insurer UnitedHealth last quarter, according to a regulatory filing, a surprising buy because of the company’s current reputation, but perhaps not considering his history of bargain investing. The…

Lyft said Thursday its co-founders, Logan Green and John Zimmer, are stepping down from the ride-hailing services provider’s board, following the completion of a two-year transition plan. Green and Zimmer began serving as the chair and vice chair…