The Bermuda Stock Exchange closed down slightly yesterday, 2.07 or 0.19 percent to close at 1,087.82.Bank of Butterfield Preference Shares fell 0.8 percent or $10.00 to close at $1,230.Shares of BRF&M finished the day down 1.9 percent or 30 cents to close at 15.55 as 6,400 shares changed hands.