You'll need to add money to the account and then search within the brokerage's platform using the symbol "BRK.B." You cannot buy Berkshire Hathaway stock directly from Berkshire Hathaway the company ...
Shares of Berkshire Hathaway Inc. (BRK.B) have gained 23.8% year to date, outperforming the industry’s 22.6% growth, the Finance sector’s rise of 18.2% and the S&P 500 composite’s rise of 19.3%.
Bank of America (NYSE: BAC) is the third-largest stock position in Berkshire Hathaway's (NYSE: BRK.A) (NYSE: BRK.B) portfolio, even after the conglomerate sold some of its position in recent months.