The VN-Index opened higher this morning and for most of the session it looked like the market was going to rise for a third straight day. However, after peaking above 630 in the afternoon, the index slumped to close at the low of the day, down 1.91 points, or 0.3%, to 625.11. GAS (-2.4%) was once again the top contributor by a wide margin, accounting for 1.45 points.