Warren Buffett's Berkshire further sold shares in Bank of America for $0.863 billion, bringing the group's shareholding ratio close to the 10% regulatory threshold. According to regulatory filings, Berkshire Hathaway further reduced its holdings in the three trading days ending Tuesday and currently holds 10.5% of the shares in the second-largest bank in the US. As long as it remains above the 10% threshold, the company must disclose the transaction within a few days. Buffett, now 94, began reducing his holdings of this huge investment in mid-July. Even after months of sell-off, based on Tuesday's closing price, Berkshire's remaining shares in Bank of America are still worth 32.1 billion US dollars, making it the largest shareholder.