The dramatic rise in dark pool trading for stocks may plateau, according to a Tabb Group senior analyst. The finding comes as the consulting company delivered their monthly report on equity trading, which showed a slight decline in dark pool trading in February.
“Over the last 6 years we have witnessed a significant increase in volume on (non-exchange) dark Alternative Trading Systems (ATSs), but this could reach a plateau,” said Sayena Mostowfi, senior analyst in equities at Tabb Group. “The firms that had plans to create alternative trading systems have already done so,” thus the volume rise in dark pool trading could slow.
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Tabb Group noted that reported volume in alternative trading platforms dropped to 874 million shares from 915 million shares in January. This came as overall industry average daily volume increased to 7 billion shares in February, up slightly from 6.9 billion in January. The top dark pools, who voluntarily report their volume were respectively: Barclays PLC (NYSE:BCS) (LON:BARC), UBS AG (NYSE:UBS), Morgan Stanley (NYSE:MS), Citadel and Goldman Sachs Group Inc (NYSE:GS). However, Mostowfi noted that some ATSs did not report their volume and the list could change slightly. A new FINRA rule requiring alternative trading systems to report volume, due to take hold May 12, would be beneficial for the market, Mostowfi said. The new rule will not apply to single dealer platforms.
Dark pool growth relation to stock market volatility
Mostowfi noted that when stock market volatility increases, trading volume on dark ATSs decreases. “Traders are sometimes concerned about resting their orders (off-exchange) and missing a market move.” She noted that during “normal” market conditions, some institutional investors prefer dark pools because of counterparty trust. “Some investors perceive if they have a large order, and execute a small portion of that order on a public exchange, other market participates can pick up on the signals there is a large order coming that will impact market prices and trade accordingly,” she said.
The dark pools with over 50% of their reported volume in large cap stocks included ConvergEx Millennium, Deutsche Bank Super X, Goldman Sachs Sigma X, Instinet CBX & VWAP Cross and Knight Match. The largest mid-cap exchanges by percentage of volume were Liquidnet Negotiated & H20 marketplaces.
In terms of large block trades, the leading exchanges were Liquidnet Negotiated & H20 platforms followed by Instinet VWAPX and BIDS.