Greece's battered banking stocks have rebounded after a three-day rout that wiped 63 per cent from their market value, helping the broader Athens market to recover.

Investors also picked up cheap shares after what was essentially a crash.

The Athens bourse's banking index reversed early losses and was 13 per cent higher by mid-morning with all of its constituent stocks in positive territory.

They were led by a nearly 22 per cent jump in National Bank, Greece's largest lender.

"The market seems to have found an equilibrium after its deep plunge. Buyers are having the upper hand despite the negative start, and this has helped sentiment across the board," said Takis Zamanis, chief trader at Beta Securities.

The broader market -- of which banking stocks make up around 20 percent -- was up 3.7 per cent.