The affably-named "Oracle of Omaha" has delivered a cumulative return of more than 5,400,000% for Berkshire Hathaway's Class A shares (BRK.A) since becoming CEO in the mid-1960s. Portfolio concentration has been an unsung hero for Warren Buffett and Berkshire's shareholders.
Read MoreWaymo is ramping up efforts to gain access to a lucrative robotaxi use case: pickups and drop offs at the San Francisco International Airport, according to emails viewed by TechCrunch and obtained through a Freedom of Information Act request.
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