KeyTech tumbled 75 cents (12.09 percent) on the Bermuda Stock Exchange yesterday with 300 shares trading to close at $5.45. Ascendant Group also fell five cents (.37 percent) with 200 shares trading to close at $13.20.Butterfield Bank jumped five cents (4.20 percent) to close at $1.24 with 36,000 shares trading. Bermuda Aviation traded 91 shares to close at $2.85 and BF&M traded 200 shares to close at $15.01, both with no change in share price.Overall, the BSX closed at 1076.73, up 13.97 points (1.31 percent) with 36,791 shares trading worth $52,193.60.