Warren Buffett has donated another $4.64 billion of Berkshire Hathaway stock to five charities, boosting his total giving since 2006 to more than $51 billion. The annual donation made on Wednesday is the 92-year-old Buffett’s largest, and consisted of about 13.7 million of Berkshire’s Class B shares. Buffett is donating 10.45 million shares to the…

Amazon founder Jeff Bezos said that he plans to give away most of his wealth during his lifetime to causes such as climate change and humanity projects, but withheld from divulging specific details. “The hard part is figuring out how to do it in a leveraged way,” Bezos said during a recent CNN interview. “It’s…