(Reuters) - Warren Buffett's Berkshire Hathaway ( BRK/A ) has trimmed its stake in Bank of America ( BAC ) once again, making the total sales since mid-July nearly $7 billion.

The conglomerate, run by one of the world's most revered investors, disclosed late on Thursday it sold 18.7 million shares of the second-largest U.S. bank between Sept. 3 and Sept. 5 to rake in roughly $760 million.

Berkshire continues to be BofA's biggest shareholder with a stake of about 11.1%, according to LSEG data. Per regulatory requirements, Berkshire Hathaway ( BRK/A ) has to keep reporting sales regularly until its holding falls below 10%.

Buffett started investing in the bank in 2011, when Berkshire bought $5 billion of preferred stock. That purchase signaled his confidence in CEO Brian Moynihan's ability to restore the lender to health following the 2008 financial crisis.

Shares of Bank of America ( BAC ) were last down 1% in premarket trading. The stock is up around 18% this year, compared with a near 21% gain in the S&P 500 Banks Index, which tracks large-cap banks.

(Reporting by Manya Saini in Bengaluru)