The Bermuda Stock Exchange fell 0.30 percent or 3.21 to close the week at 1,063.65.Butterfield Bank shares traded most, with some 804,011 changing hands, closing unchanged at $1.23.Five-hundred BF&M shares traded last week, closing Friday at $16, while Argus fell 10.29 percent, or 35 cents, to close at $3.05. Some 1,600KeyTech shares traded, rising 25 cents, to close at $6.