Greek stocks retreated 2.33 percent yesterday, declining for a second consecutive session, on across-the-board losses. The Athens bourse’s benchmark general index fell 95.52, or 2.3 percent, to 4,000.98 points. The FTSE/ASE 20 index of the country’s biggest companies shed 2.6 percent to 2,129.83. National Bank, the country’s largest company based on market capitalization, ended 2.66 percent lower at 32.90 euros. Piraeus Bank also took heavy losses, retreating 4.17 percent to close at 20.70 euros. A total of 202 shares fell, versus 41 that rose, leaving 28 stocks unchanged. Turnover reached 215.8 million euros.