The Royal Gazette/Bermuda Stock Exchange Index gained 9.34 points yesterday to close at 3,637.59. Butterfield Bank closed unchanged at $43.50 after investors traded 10,000 shares. LOM (Holdings) Limited also closed unchanged at $2.90 on the trading of 4,800 shares. Investors of Belco Holdings Ltd. traded 1,000 shares, pushing up the stock price $1 to $41.