Berkshire Hathaway (NYSE: BRK.A)(NYSE: BRK.B) has proven to be one of the most profitable investments in history. Since 1980, the shares have risen more than 2,000-fold! A $100 investment would now be worth about $250,000.

Now, with a market cap of $900 billion, most of Berkshire's biggest gains are likely behind it. But that hasn't stopped the stock from doubling the return of the S 500 during the past three years.

But what should investors be thinking right now? Is Berkshire stock a buy, sell, or hold?

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Source Fool.com