Argus Group Holdings Ltd. fell 25.45 percent ($1.4) on The Bermuda Stock Exchange (BSX) yesterday.The insurer traded 4,813 shares to close at $4.10.Butterfield Bank was the only other trader, seeing 78 preference shares change hands, but its share price held firm at $225.Overall the Index dropped 25.49 points (2.18 percent) to 1,144.04, with 4,813 shares worth BD$19,792.15 and 469 shares worth US$100,565.70 transacted.The BSX Insurance Index, however, rose two points (0.19 percent) to 1,032.