The widening popularity of day-trading is also a concern, because it has greatly increased the volatility of the exchange.
Google mistakenly released disappointing quarterly earnings during the trading day, fueling general investor concern over online advertising sales and the shift to mobile.
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Meanwhile, in a sign of regulators' growing concern about evolving electronic trading, the SEC staff is also studying rules for so-called dark pools, private electronic-trading networks that match buyers and sellers anonymously.
"We do think the Volcker rule address a core concern we had with proprietary trading by banking entities, " says Barr.
Its bonds were trading at distressed levels today, indicating a mounting concern whether it can pay debts.
Wall Street players have lately expressed concern that too much regulation of high-speed trading could crimp markets.
Trading standards officials said it regards teenagers as the main cause of concern, often breaking the law by setting fireworks off in public places.
Neu was enormously successful in hugely growing the value of the privately held family concern, Hugo Neu, from a simple scrap metal trading business into one of the largest automobile crushing operations in the U.S. He then profited from taking all that crushed metal and made it available for the needs of emerging nations for raw materials for their economies.
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Apple shares fell 1.5% in after hours trading on Wall Street, although analysts said the lower numbers should not be of too much concern.
"The concern is that those who are pushing into prime brokerage are either aggressively lending" or cutting trading commissions to get the business, he said.
Bart Chilton, a Democratic commissioner of the Commodities Futures Trading Commission, said it is a headache for regulators to determine whether industry lobbying is based on a legitimate concern or is simply a delaying tactic.
However, the economic environment and trading circumstances create material uncertainties which may cast significant doubt on the Group's ability to continue as a going concern in the future.
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