Dark pool universe continues to morph

What's the hottest broker-dealer-owned dark pools service right now? Most people would say Goldman Sach's Sigma X, whose stature as a trading venue is growing, pushing the service into the ranks of BATS Trading and Direct Edge ECN. It certainly has been active. The latest: it just inked a deal with ABN AMRO that will give the Dutch bank's clients direct access to Sigma X. Goldman Sachs seems bent on inking more and more partners at different levels. It just signed a deal to connect Sigma X to Fidelity's Cross Stream dark pool service, for example. Fidelity also inked a deal with UBS's PIN ATS. Of course, Sigma X and PIN ATS are linked already (the linkages can get a little recursive and, frankly, confusing). Volume seems to be exploding, and all dark pools are angling to get more algo flow, more flow from dark pool partners and more from specific institutional clients directly.  

For more:
- here's an article on Sigma X and ABN AMRO from Financial News Online

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