Tranda Wecker, the twins' biological mother, then appointed a child law specialist to represent her at the UK hearings.

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Mr Wecker said he was pursuing custody because the situation had changed since he first agreed to give up the girls.

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The babies, who were born in St Louis last June to Tranda and Aaron Wecker, were put up for adoption through an internet agency after the couple separated.

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Firms tag all of their trades with a unique identifier for each trade by customer, by stock and time, among other things, Lime Brokerage CEO Jeff Wecker says.

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They were adopted first by the Allens, then two months later taken by Tranda Wecker and the Kilshaws to Arkansas where the couple adopted them under the state's lenient adoption laws.

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She said she now wants the twins back but her estranged husband, Aaron Wecker - the natural father of the twins - has also applied to a court in Missouri for custody.

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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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