berkshire hathaway inc companiesberkshire hathaway inc portfolioberkshire hathaway inc sharesberkshire hathaway inc stockberkshire hathaway inc holdingsberkshire hathaway inc tickerberkshire hathaway inc logoberkshire hathaway inc nyseberkshire hathaway inc bberkshire hathaway inc del cl b newberkshire hathaway b stocksberkshire hathaway inc dividend