By Bradley Hope 

After years of fighting for more trading to come back onto stock exchanges, Nasdaq OMX Group Inc. is considering joining the dark side.

The exchange operator has approached several of the biggest banks with a proposal to take over the operation of their "dark pools," and is planning to ask the Securities and Exchange Commission for permission to do so, according to Nasdaq Chief Executive Robert Greifeld.

Dark pools, lightly regulated private trading venues mostly operated by large banks, have come under scrutiny over the past year as regulators seek more details about whether they adequately police trades and disclose enough information to clients.

The company's new business venture would mark a change of tune of sorts for Nasdaq. Mr. Greifeld--along with the New York Stock Exchange--traditionally has been a critic of the amount of trading on dark pools, arguing that such trading hurts the ability of markets to operate efficiently and facilitate accurate pricing for stocks.

Mr. Greifeld has repeatedly pushed for the SEC to consider implementing a so-called trade-at rule, which would force more trading off of dark pools and onto exchanges. He wrote in an editorial in The Wall Street Journal in July 2014 that "no one can argue against the healing power of transparency in the price-discovery process."

Mr. Greifeld said in an interview that the new initiative was a response to the needs of the company's customers and not a strategic change.

Banks' "costs are skyrocketing and our job is figuring out how we can help them solve that problem," he said.

Nasdaq still would like to see more trading return to exchanges but meanwhile is trying to position itself as a technology partner for banks dealing with growing regulatory scrutiny and technology costs, he said.

Nasdaq's efforts come as its chief rival, New York Stock Exchange owner Intercontinental Exchange Inc., is trying to force more trading back onto exchanges through a new proposal circulating among banks and institutional investors.

Banks are under pressure to rethink how they handle stock trades in these private trading venues, especially amid probes from regulators looking for irregularities or preferential treatment of certain investors.

Also, new regulations approved last year are expected to increase the cost of running these venues.

"What we've learned in the past two or three years is that any kind of glitch or error can be the source of a very large reputational risk," said Sayena Mostowfi, a senior analyst at TABB Group in New York. "It might be appealing to find an expert to run those systems."

Nasdaq's pitch is simple: Using its technology, surveillance software and regulatory expertise, it can manage dark pools on behalf of banks.

Banks still would be able to trade at lower prices than they do on exchanges, and bank customers still could trade anonymously.

A final business product hasn't been completed, and plans may change, the company said.

UBS AG, Credit Suisse Group AG and Deutsche Bank AG operate the three largest dark pools in the U.S., according to data from the Financial Industry Regulatory Authority.

Dark pools originally were designed to help investors trade large blocks of stock while minimizing any impact on the price caused by those orders and reducing costs by avoiding exchange fees.

But over time they have grown in size and seen the average size of trades decline, making them more similar to exchanges but without the intense regulation exchanges are subjected to by the SEC and Finra.

The New York attorney general last year accused Barclays PLC of fraud and misleading customers related to its dark pool, known as Liquidity Cross. Barclays later denied it misled its clients and said the New York case was "based on clear and substantial factual errors."

Other exchanges and nonbank dark-pool operators are expected to try to get in on the business of operating dark pools for banks, too, but Nasdaq is among the first to aggressively pitch banks on the idea, according to people familiar with the presentations.

ICE has privately been trying to persuade banks to agree to a plan where trading fees are slashed in exchange for a rule that would require more trading to take place on exchanges.

So far, it has persuaded Credit Suisse to support its plan and is trying to persuade other banks and investors to sign on to its proposals.

BATS Global Markets Inc., the third major exchange operator, has put forward a letter with much more moderate proposals.

Nasdaq has planned a pilot project that would lower the trading fees on 14 stocks starting in February.

Lowering access fees, which some argue will reduce costs for brokers and increase trading, is an important part of the ICE proposal as well.

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