Some 157,200 Butterfield Bank shares traded on the Bermuda Stock Exchange yesterday.The Bank’s shares closed unchanged at $1.39.Argus Group shares fell 16.2 percent for the day, or 69 cents, to close at $3.56 as some 8,800 shares changed hands.Ascendant Group also declined, dropping 20 cents to $11 on a volume of 2,000 shares.And KeyTech shares rose 20 cents to close at $5.75 on a volume of 2,000.Overall the BSX ended the day down 11.66 or 1 percent at 1,157.53.