The company (mark: BRK. A, BRK. B) has proven its status as a haven this year. Class A shares fall 5% to $428,800, versus a 21% drop in the S&P 500 It is sitting on a mountain of cash — more than $100 billion — and its earnings have been strong, rising 56% in the second quarter thanks to an increase income from higher short-term interest rates and a larger equity portfolio.