Argus Group Holdings Ltd and Butterfield Bank were the biggest losers on The Bermuda Stock Exchange (BSX) last week.Argus fell 9.8 percent (45 cents) to $4.15 with 500 shares traded, while Butterfield dropped six percent (eight cents) to $1.26 as 12,462 shares changed hands.But BF&M Ltd rose 0.9 percent (13 cents) to $14.73 with 3,878 shares transacted and the Ascendant Group Ltd traded 1,900 shares while its share price remained unchanged at $14.50.Overall the Index declined 49.38 points (4.42 percent) to 1,115.39 as 18,740 shares worth BD$102,867.70 and 29,418 shares worth US$301,404.50 changed hands.The BSX Insurance Index, however, was up seven points (0.74 percent) at 958.