Even before some individual stocks collapsed to just a penny a share, data from the NYSE Euronext's electronic ARCA exchange started to appear questionable, say traders.

交易员说，甚至在某些个股跌至每股仅一美分前，纽约泛欧交易所集团(NYSE Euronext)的ARCA电子交易平台传输的数据看起来已开始出现问题。

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In its latest release, NYSE Euronext says its NYSE Arca exchange should be considered the primary market under its proposed scenario to open for trading without the floor.

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LimeInside currently offers co-location at the New York Stock Exchange, Nasdaq OMX Group, NYSE Arca and BATS. This service will be extended to Direct Edge, the newest exchange, and the rest of the New York Stock Exchange in a few weeks, Wecker says.

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The New York Stock Exchange, which has historically dominated the trading market, has about 25% of the trading volume between NYSE Classic and NYSE Arca, on June 15, according to BATS Exchange data.

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