(Bloomberg) -- Shutting down the Greek market has trained attention on ETFs tracking its stocks, adding an element of speculation to their prices as long as the Athens bourse is closed.

In the U.S., owners of the Global X FTSE Greece 20 ETF will have less information in deciding how much the security is worth. It tumbled 17 %. In Europe, the Lyxor ETF FTSE Athex 20 plunged on one exchange and was halted on two others. Trading on the Athens Stock Exchange was suspended until July 6 as the country moves to avert the collapse of its banking system.

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