 says his children will manage the estate. Warren Buffett on Friday made his biggest annual donation to date, giving $5.3 billion worth of Berkshire Hathaway shares to five charities. The Oracle of Omaha has pledged to give away the fortune he built at Berkshire. The Omaha, Nebraska-based conglomerate he started running in 1965. Buffett has been making annual donations to the five charities since 2006.