Shares of Argus Group Holdings Ltd gained 4.4 per cent in Bermuda Stock Exchange trading.The insurer advanced nine cents to close on $2.15 as 14,300 shares changed hands.The only other stock to trade was LOM Financial Ltd, which remained unchanged on $2.72 as 10,000 of its shares were traded.Butterfield Bank’s US-listed shares surged $2.14, or 8.32 per cent, to close on $27.86 on the New York Stock Exchange, as 337,257 shares traded. Butterfield last traded at $24.30 on the BSX.The Royal Gazette/BSX Index added 1.8 points, or 0.1 per cent, to close on 1,780.2. For the week, the index dropped 7.1 per cent, driven mainly by a 10 per cent fall in Butterfield Bank shares.The BSX Insurance Index gained 62.44 points, or 4.22 per cent, to close on 1,542.2.