The Athens stock exchange closed the session at its lowest level of the day, with the overall index down 0.64 percent to 2,602.41 points. Early gains were erased as sales in the banking sector and in refineries turned negative. Meanwhile, European markets and Wall Street posted gains during the same period. Trading turnover remained below 255 million euros. The combination of sector losses and broader market advances defined the day's movement. Investors observed the shift as the index slipped.