KeyTech had a big day on the Bermuda Stock Exchange, shooting up 70 cents (13.2 percent) to close at $6 with 577,700 shares trading. Butterfield Bank also rose five cents (4.16 percent) to close at $1.25 with 82,738 shares trading hands. Argus dropped five cents (1.19 percent) to close at $4.15 with 4,000 shares trading.Overall, the BSX closed at 1,096.77, up 31.47 points (2.95 percent) with 664,438 shares trading worth $3,577,861.84.