Argus and KeyTech tumbled last week on the Bermuda Stock Exchange while Ascendant and Butterfield Preferred made gains.Argus fell five percent (20 cents) trading 98,584 shares to close at $3.80. Argus’s market capitalisation now stands at $81.7 million. KeyTech also fell 20 cents (3.66 percent) with 900 shares trading to close at $5.25.Two other companies moved in the opposite direction.Butterfield Preferred climbed $10 (.81 percent) to $1230 on low volume with only ten shares trading. Ascendant Group also climbed five cents (.37 percent) to $13.25 with 2,300 shares trading. Butterfield Bank traded 92,200 shares to close at $1.30 with no change in share price.Overall, the BSX slid 5.65 points (.51 percent) last week to close at 1,099.52. Share volume topped 194,000 while total turnover was more than $540,000.