What is BRK? Berkshire Hathaway (Warren Buffett). Sorry should have said BRK-A https://uk.finance.yahoo.com/q?s=brk-a&ql=1 or BRK-B. A single share of BRK-A is expensive, around $215,380 recently. There are around 1500 BRK-B shares per A share i.e. more affordable $143 per share. Generally they're the same, but with A shares there are certain other privileges http://moneymorning.com/2014/12/05/whats-the-difference-between-berkshire-a-and-b-shares/