KeyTech tumbled 30 cents (5.45 percent) on the Bermuda Stock Exchange, to close at $5.20 with 5,000 shares trading, while Ascendant Group jumped 60 cents (4.58 percent) to close at $13.68 with 2,200 shares trading.Butterfield Bank fell six cents (5.00 percent) to close at $1.14 with 9,400 shares trading and Argus dropped one cent (.24 percent) with 19,900 shares trading to close at $4.15.Overall, the BSX closed at 1039.77, down 27.11 points (2.54 percent) with 36,500 shares trading worth $146,640.85