Updated on Friday, July 03, 2009, 11:59 IST

New York, July 03: Billionaire investor Warren Buffett has donated about USD 1.5 billion of Berkshire Hathaway Inc stock, in connection with his 2006 pledge of his holdings to charitable causes.

According to a regulatory filing, Buffett on Wednesday donated 428,688 Berkshire Class B shares to the Bill and Melinda Gates Foundation, and 87,884 shares to four family charities.

Following the donations, Buffett still held 350,000 Class A and 1,501,532 Class B shares of Berkshire, together worth about USD 36.1 billion based on Wednesday closing prices.

Buffett said he still has a 25.8 percent stake in Berkshire, and 31.6 percent of the company's voting power. A Class B share is worth about 1/30th of a Class A share.

Buffett, 78, has built Omaha, Nebraska-based Berkshire into a conglomerate with close to 80 businesses that sell such things as insurance, clothing, ice cream and paint, and which owns tens of billions of dollars of common stock.

Forbes magazine in March called Buffett the world's second-richest person, trailing only Bill Gates, who is also a Berkshire director. Gates co-founded Microsoft Corp.

Bureau Report