Butterfield Preferred shares dropped $14 (1.13 percent) on the Bermuda Stock Exchange (BSX) yesterday to close at $1,216. Butterfield Bank gained one cent (.80 percent), trading 52,031 shares to close at $1.25.Ascendant Group and KeyTech both traded shares to close at $11.50 and $5.75, respectively, both with no change in share price.Overall, the BSX closed at 1,073.01, up 4.74 (.44 percent), trading 54,431 shares worth BD$84,013.44 and 129 US shares worth US$160,500.