Butterfield Bank closed down a cent at $1.35 as 20,000 shares traded on the Bermuda Stock Exchange yesterday.Butterfield Preference Shares closed up a $1 at $1234.00.Some 600 shares in Ascendant Group also changed hands, closing unchanged at $11.45.Overall the BSX ended at 1,116.28, down 4.72 or 0.42 percent.