Greek stock market crashes 20% on reopening

The Greek stock market crashed more than 20 percent Monday as it reopened for the first time in five weeks.

Banking stocks were among the biggest losers. The country's four biggest lenders - Piraeus, Alpha Bank, the National Bank of Greece and Eurobank - were all down 30 percent, according to CNNMoney.

The country's financial crisis caused officials to suspend all trading at the end of June.

Read more from CNNMoney.