Butterfield Bank was the lone stock to trade on the Bermuda Stock Exchange.The bank remained unchanged on $36 as 1,440 shares changed hands.Butterfield’s US-listed shares remained unchanged on $36.58 on volume of 155,512 shares on the New York Stock Exchange.The Royal Gazette/BSX Index was unmoved on 2,340.73, as BSX trading turnover totalled $52,408.60.For the week, the index gained 78.31 points, or 3.34 per cent, driven mainly by a 4.3 per cent increase in Butterfield’s stock price over the five days and an 8.9 per cent rise in shares of insurer BF&M Ltd.The BSX Insurance Index gained 3.69 points, or 0.21 per cent, to close on 1,720.37.