Butterfield Bank was the only trader on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 40,785 shares to close at $1.50.Overall the Index remained unchanged at 1,231.57.Some 40,785 shares worth $61,177.50 changed hands on the BSX.The BSX Insurance Index, however, fell four points (0.43 percent) to end the day at 923.