Subject: Re: How high will this thing go?
Latest P/B is 1.6. IIRC, BRK's P/B generally swings between 1.35 and 1.55 and its well beyond that now.

About a year ago Berkshire traded at $420.56, a P/B of 1.74 (book was $242.28).

How high is it going to go?

Using current book $279.20 multiplied by 1.74 the price could reach $485.81. That's the price I'd sell. Or write covered calls for (although I haven't done that yet).