The Bermuda Stock Exchange finished the week at 1,071.60, up 12.82, or 1.19 percent.Butterfield Bank traded heaviest, with 101,779 shares changing hands last week, closing unchanged Friday at $1.23.KeyTech finished the week up 8.1 percent, at $6.00 as 42,923 of the company’s shares traded.Ascendant Group rose nearly 3 percent, closing at $12.40 as 2,624 shares traded.Argus Group declined 2.8 percent, or 10 cents, to close the week at $3.50 on a volume of 4,000.Bermuda Commercial Bank shares closed up 10 percent on the BSX Friday, ending the day at $11.00 as 200 of them changed hands.