Butterfield Bank was the biggest trader on The Bermuda Stock Exchange (BSX) yesterday.The bank traded 3,400 shares as it opened and closed at $1.43.The Ascendant Group Ltd also saw 100 shares change hands, but its share price remained unchanged at $13.80.The Index, as a whole, also stood firm at 1,209.26 with 2,500 shares worth $6,242 transacted.The BSX Insurance Index, meanwhile, fell seven points (0.72 percent) to 970.