The Bermuda Stock Exchange (BSX) closed unchanged yesterday as no common shares changed hands.The Royal Gazette/BSX index ended the day at 1,243.69.Butterfield Bank’s preference shares closed at $1,250, up 1.6 percent, or $20, as 418 shares changed hands.The BSX Insurance Index, meanwhile, fell 58 points, or 6.30 percent, to close at 862.00.