Is Berkshire Hathaway Stock a Buy?

Berkshire Hathaway (NYSE: BRK.A) (NYSE: BRK.B) stock just went on a historic run.

Over the past 12 months, the stock price has surged by 25%. Over the past five years, meanwhile, shares have more than doubled in value.

Berkshire's stock price rarely rises this quickly over such a short amount of time. Is the stock still a buy? The answer might surprise you.