Bank of Butterfield rose 2 cents, or 1.7 percent, on the Bermuda Stock Exchange yesterday, closing at $1.21 on a volume of 46,307 shares.Butterfield Preference shares also traded. Some 225 of them changed hands, closing up $5 at $1,225.KeyTech closed up 13.8 percent, or 75 cents, at $6.20 as 11,600 shares were traded.Some 62,700 Argus Group shares traded, but closed unchanged at $3.90.Bermuda Aviation Services closed down 15 cents, or 5 percent, as 500 shares changed hands, finishing at $2.85.The BSX closed up 1.72 percent, or 18.12, to finish the day at 1,074.26.