Argus Group shares jumped on the Bermuda Stock Exchange yesterday, closing at $4.73, up $1.13, or 31.38 percent.Some 1,573 Argus shares traded.Butterfield closed unchanged at $1.40 as 258,853 shares changed hands. And KeyTech dropped 5 cents, or 0.86 percent, to finish at $5.70 as 5,900 changed hands.Overall the BSX closed at 1,167.85, up 19.68 or 1.7 percent