Insurance sector rivals BF&M Ltd and Argus Group Holdings Ltd moved in opposite directions on the Bermuda Stock Exchange last week.BF&M was the biggest climber on the domestic board, as its share price gained 85 cents, or 6.1 percent, to close at $14.85 on Friday, on the trading of 4,500 shares over the five days of trading.Argus suffered the biggest drop, as its shares tumbled 14 percent. Five thousand Argus shares changed hands, as the price fell 81 cents to $4.99.The most heavily traded stock of the week was West Hamilton Holdings Ltd. But the developer remained unchanged on $8, despite the volume of 40,000 shares traded.Butterfield Bank saw trading activity, as did its preference shares, but neither changed in value over the week.Ascendant Group also remained unchanged on $15 after 4,000 shares traded and Bermuda Commercial Bank Ltd stayed on $10 after 685 shares changed hands.The Royal Gazette / BSX Index fell 7.96 points, or 0.7 percent, to close on 1,144.82. Volume for the week topped 63,000 shares, while turnover was a little short of $500,000.