The next salvo in a push by providers of exchange-traded funds to capture a bigger part of the $7 trillion U.S. stock mutual funds market has taken place.

The operator of the New York Stock Exchange filed a request with the Securities and Exchange Commission on Thursday to adopt a new rule that would permit so-called "nontransparent" ETFs to list and trade on its platform.

The ETFs would be listed on the Arca trading platform of the NYSE Euronext, a unit of IntercontinentalExchange Group Inc.

As it stands now, ETF sponsors must report securities held in each portfolio on a daily basis. Officials at NYSE Euronext, the exchange's parent, are now asking for permission to trade ETFs that only have to report quarterly, much like traditional mutual funds, according to a copy of the filing on the exchange's website. An NYSE official confirmed to The Wall Street Journal that it had been transmitted to the SEC.

"We're finally seeing some real momentum in the move to gain regulatory approval for nontransparent ETFs," said Kathleen Moriarty, an ETF pioneer who is now an attorney at Katten Muchin Rosenman LLP in New York. She was on the team that developed the SPDR S&P 500 ETF, the first exchange-traded fund, which launched in 1993.

Proponents of the change argue that nontransparent ETFs would allow managers engaged in actively picking stocks and other securities to compete much more effectively with traditional mutual funds. To date, the ETF industry is overwhelmingly focused on passive investing that follows an index. Funds not linked to a benchmark represented 0.01% of the nearly $1.2 trillion in U.S.-listed stock ETF assets through last week, according to fund researcher Lipper. By contrast, some 76% of stock mutual fund assets are actively managed.

The NYSE's request comes a day after Precidian Investments, of Bedminster, N.J., filed the first proposed prospectus detailing how such ETFs might work. The document lays out guidelines for three proposed U.S. stock portfolios--one covering large caps, another investing in domestic mid caps and the last taking a multi-cap approach. The funds would use a custodian and a blind trust to help shield key information about holdings until the end of each quarter.

The NYSE filing describes ETFs much in the same manner as Precidian's system. Rival exchange operator Nasdaq OMX Group Inc. has also been working with other fund sponsors interested in bringing to market nontransparent ETFs, those familiar with the situation have told The Wall Street Journal. They expect a request laying out trading rules for a different set of nontransparent ETFs to be filed sometime in the first quarter, perhaps in coming weeks.

Other industry leaders have also filed with the SEC to move in the same direction, although those plans haven't reached the stages of submitting a formal prospectus or definite trading rules, according to analysts. Those include BlackRock Inc., State Street Corp., Eaton Vance and T. Rowe Price.

Write to Murray Coleman at murray.coleman@wsj.com

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