The market's current valuation for it is roughly reasonable to slightly low.

What's really attractive isn't how much it might rise in the short term,  

but that you're buying an extremely difficult-to-replicate portfolio of assets at a still reasonable price.

Many stocks rise on stories.

Berkshire Hathaway proves itself over time.

It's not necessarily exciting.

But it's highly likely to let you sleep soundly.

If we use the BRK.B share price to understand, it can roughly be viewed like this:

Below $450: Quite comfortable  

Around $470: Reasonable to slightly low  

Around $500: Basically reasonable  

Above $530: Starting to get not cheap  $Berkshire Hathaway B(BRK.B.US)$Apple(AAPL.US)$Alphabet - C(GOOG.US)Can be called a "slow bull"