Stocks gained for the third session in a row on the Athens Stock Exchange (ASE) on Thursday, as investors continued to focus on medium- and small-capitalization firms. Sixty-five stocks closed at 52-week highs. The ASE general index closed at 3,767.91 points, a gain of 13.20 points or 0.35 percent. On a weekly basis, it gained 2.84 percent. The ASE was closed yesterday. The FTSE/ASE-20 index of blue chips gained 0.23 percent to close at 2,072.35 points, while mid-caps and small-caps gained 0.96 percent and 1.79 percent, respectively. The new FTSE/Athex International index gained 0.27 percent to close at 5,154.33 points. Among blue chips, significant gains were made by metals group Viohalco (up 7.40 percent to 7.84 euros), casino and hotel operator Hyatt (3.66 percent to 11.32 euros), telecommunications equipment manufacturer Intracom (2.08 percent to 5.90 euros), Duty Free Shops (1.83 percent to 15.62 euros) and refiner Hellenic Petroleum (1.33 percent to 12.16 euros). Of the 328 traded shares, 204 gained, 79 declined and 45 ended unchanged. Turnover reached 278.18 million euros, including 33.98 million in prearranged trades. The most heavily traded stocks, by value, were OTE (33.11 million euros), Alpha Bank (29.55 million), Cosmote (20.10 million) and OPAP (17 million).