It would have taken a lot of shares to make much profit, though. Dromeas closed at 0.147 euros, a 28.9 percent increase from its previous close of 0.114 euros.

The company announced on July 29 - during the five weeks the stock market was closed - that it had won an international tender to supply all EU offices over a five-year period. It had won a similar tender in 2009.

Greek stocks <.ATG> unofficially closed with losses of 16.2 percent on Monday, the first day of trade after the five -week shutdown.

(Reporting By Michele Kambas, editing by Larry King)