Buffett's firm becomes Bank of America's biggest shareholder
World's fourth richest person Warren Buffettâs Berkshire Hathaway has become the biggest shareholder of US' second largest bank, Bank of America, with a 6.6% stake. Berkshire became its largest shareholder by exercising its right to acquire 700 million shares at a steep discount. Notably, Berkshire is also the largest shareholder in US' third largest bank, Wells Fargo.