Argus Group Holdings Ltd was the only stock to trade on the Bermuda Stock Exchange.The insurer remained unchanged on $2.25 as 10,000 shares changed hands.The Royal Gazette/BSX Index closed unchanged on 1,595.52.Butterfield Bank’s US-listed shares surged $2.64, or 11.64 per cent, to close on $22.45 on the New York Stock Exchange. A total of 405,902 of the bank’s shares traded.Butterfield last traded at $20 on the BSX.The BSX Insurance Index gained 61.07 points, or 5.45 per cent, to close on 1,181.69.