Wall Street Brokerages Look To Shed Light on Dark Pools (Donna Kardos)

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Dark Pool Scenario

Goldman Sachs Group Inc., Morgan Stanley and UBS AG announced a series of deals that will allow their clients to share access to all three firms' pools of non-displayed liquidity as they try to address the growing complexity of market fragmentation amid so-called dark pools.

The moves come as dark pools -- the secretive electronic trading networks that match buyers and sellers anonymously -- are booming in popularity as big institutional investors look for ways to trade blocks of stock without triggering ripples in the share price, as can happen on traditional stock markets such as the NYSE and Nasdaq Stock Market.

But all that darkness is causing nightmares on Wall Street because there are now so many that using them is increasingly frustrating and time-consuming.

The deals announced Tuesday allow algorithmic-trading orders of each firm to interact with the U.S. equity liquidity found in three of the nation's largest broker-dealer-operated dark pools -- Goldman Sachs' SIGMA X, Morgan Stanley's MS POOL and UBS' PIN ATS.