 Investors are impressed by Berkshire Hathaways BRK.A , Financial BRK.B , Financial announcement on Monday that it will acquire Alleghany Corp. Y , Financial for 848.02 per share in an 11.6 billion blockbuster deal. The offering price is an over 25 premium to Alleghanys closing price last week and a 16 premium to its 52-week high closing price. 