At the end of 2017, Berkshire Hathaway's Class A shares, the ones that have existed since 1964,

traded for approximately $297,600 per share.

The stock has produced an overall gain of 2,404,748% in the 1964-2017 time period.

This implies that Berkshire Hathaway's stock price was just $12.37

at the time Buffett took over the company.
And it also means that a $10,000 investment would have bought 808 shares of the company,
which would be worth more than $240 million as of the end of 2017.

-Berkshire's 2017 annual report