Carlos Barria / Reuters
- Warren Buffett has made giving away Berkshire Hathaway stock a Thanksgiving tradition.
- He just donated $866 million worth of shares to his family's foundations, echoing last year's gift.
- Buffett discussed wealth and philanthropy, and revealed fresh details about his estate planning.
Warren Buffett's new Thanksgiving tradition is a little more elaborate than picking up a pumpkin pie for dinner. The famed investor donated close to $900 million worth of his company's stock to four of his family's foundations on Tuesday, topping his nearly $800 million gift last November.