Trading will resume on the other exchanges and in the over-the-counter market once trading has resumed on the primary listing market.

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He added that NYSE Arca, which many trading venues declared self-help against that day, is the primary listing venue for ETFs.

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The company's executives are thinking about joining them, and shifting their primary listing from Toronto to Hong Kong in the process.

ECONOMIST: Stock exchanges

If the primary listing market has not reopened within 10 minutes from the initiation of the trading pause, the other exchanges may resume trading.

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According to a Bloomberg report yesterday, the owners of Polyus Gold and another outfit Polymetal International Plc are considering merging the Russian gold miners as Polyus seeks a primary listing in London.

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Didata hopes to move its primary listing to London later this year, because it is easier to raise money there, and because its employees in Asia and Europe do not want their share options denominated in rand.

ECONOMIST: South African software