The Bermuda Stock Exchange ended the week down 25.86, or 2.27 percent, at 1,135.83.Butterfield Bank declined a cent to $1.37 as 189,487 shares changed hands.Butterfield’s Preference shares closed at $1,202.01, up 0.2 percent, as 110 shares changed hands.KeyTech shares were unchanged at $6 as 10,183 shares changed hands.Argus Group shares fell 23.7 percent to $3.61 as 2,700 shares changed hands.Ascendant Group shares were unchanged at $11 as 153 shares changed hands.