KeyTech shares fell five percent ($0.34) in trading on the Bermuda Stock Exchange yesterday to close at $5.81 a share. 500 shares traded.Shares of Butterfield Bank also traded yesterday with more than 88,000 shares changing hands. The stock closed the day unchanged at $1.27.Overall, the BSX fell 4.21 points (0.38 percent) to close at 1.091.99.