[Buffett to Donate 12 Million Class B Shares to Four Foundations, Worth Nearly $6 Billion] According to Golden Finance, on July 14, Berkshire Hathaway announced that Warren Buffett will convert shares. Buffett plans to convert 8,000 Class A Berkshire shares into 12 million Class B shares. Buffett will donate 12 million Class B shares, worth nearly $6 billion, to four foundations.