Shares of Argus Group Holdings Ltd gained 7 per cent in Bermuda Stock Exchange trading.The insurer, the only stock to trade on the BSX, climbed 15 cents to close on $2.30 on the trading of 58,900 shares.The Royal Gazette/BSX Index added three points, or 0.15 per cent, to close on 1,955.71.The BSX Insurance Index fell 51.58 points, or 3.39 per cent, to close the day on 1,472.05.The US-listed shares of Butterfield Bank fell $1.33, or 4.81 per cent, to close at $26.32 on the New York Stock Exchange, as 238,250 shares traded. Butterfield last traded on the BSX at $28.05.