Butterfield Bank was the biggest mover on the Bermuda Stock Exchange (BSX) last week.Some 163,650 shares in the Bank traded hands, closing down 3 cents for the week at $1.17.In other movers, West Hamilton Holdings ended the week at $6 on a trading volume of 11,000 shares.BF&M was up 1.3 percent, or 20 cents, finishing the week at $14.95 as 1,000 shares were exchanged.Argus was unchanged at $4.55 on a volume of 37 shares.Overall for the week the BSX closed down 1.16 percent or 12.49 at 1,069.48 on a total share volume of 175,747.