June 28 (Reuters) - Warren Buffett has donated another

$5.3 billion of Berkshire Hathaway ( BRK/A ) stock to five

charities, his biggest annual donation since he began making

them in 2006.

The annual donation announced on Friday consists of about 13

million of Berkshire's Class B shares.

Buffett is donating 9.93 million shares to the Bill &

Melinda Gates Foundation.

He is also donating 993,035 million shares to the Susan

Thompson Buffett Foundation, named for his late first wife, and

695,122 shares to each of three charities led by his children

Howard, Susan and Peter: the Howard G. Buffett Foundation, the

Sherwood Foundation and the NoVo Foundation.

Buffett, 93, plans to give away more than 99% of the fortune

he built at Omaha, Nebraska-based Berkshire, the conglomerate he

has run since 1965.

Despite having given away more than half of his Berkshire

shares, Buffett is still worth $134.3 billion, making him the

world's eighth richest person, according to Forbes magazine.