The VN-Index treaded water on Wednesday, closing down less than a tenth of a percent after a rally over the last week pushed the index to a fresh nine-year high. HT1 (-3.8%) slumped to a two-year low and extended a 24% plunge over the last month after reporting poor Q2 results last week. STB (-3.5%) fell after the bank's former Vice Chairman was arrested and charged in connection with losses at the bank.