Buffett is the world's fifth richest person, with a $120.5 billion fortune, according to Forbes magazine.

Warren Buffett said on Tuesday he has donated about $866 million of Berkshire Hathaway stock to four family charities, and told shareholders "I feel good" as he moves nearer the sunset of his storied investing career.

In a regulatory filing, the company said Buffett donated 1.5 million Class B shares of Berkshire to the Susan Thompson Buffett Foundation. Named for his late first wife, the organization works in reproductive health.

Buffett donated another 900,000 Class B shares, divided evenly among charities run by his children, Howard, Susan and Peter: the Howard G. Buffett Foundation, the Sherwood Foundation and the NoVo Foundation.

The donations supplement the $759 million of Berkshire stock that Buffett donated to the charities at this time last year, also just before the U.S. Thanksgiving Day holiday.

Buffett also issued a rare letter to shareholders, again pledging that more than 99% of his wealth would go to charity, with his children serving as executors of his will. He said Berkshire was "built to last" and would remain in good hands.

Warren Buffett said on Tuesday he has donated about $866 million of Berkshire Hathaway stock to four family charities, and told shareholders "I feel good" as he moves nearer the sunset of his storied investing career.  - (Reuters)