Argus Group Holdings Ltd was the biggest trader on The Bermuda Stock Exchange (BSX) yesterday.The insurer traded 4,500 shares but its share value held firm at $4.50.Keytech Ltd also saw 2,000 shares change hands as its share price remained unchanged at $5.60.Overall the Index fell 5.49 points (0.51 percent) to 1,064 with 6,500 shares worth $31,450 transacted.The BSX Insurance Index, however, rose seven points (0.71 percent) to 999.