I must be incredibly naive but isn't the function of the market maker on the NYSE to provide an orderly market in the stock? How do less than 18,000 shares move a stock with millions of shares outstanding by over 4%?? Particularly on a day when AM Best affirms Fairfax's ratings, cites all the improvements (cash, commuted reinsurance treaties, cleanup of C&F's property cat exposure, etc.) and declares the outlook stable. This happens all the time with Fairfax stock.