The Nasdaq Stock Market Inc. announced that, effective Tuesday, it has become operational as an exchange in Nasdaq-listed securities.

As a result, Nasdaq is now operating as an independent self-regulatory organization, separate from the National Association of Securities Dealers. Nasdaq plans to become operational as an exchange in other exchange-listed securities on Oct. 1.

At the same time, NYSE Group Inc. said that companies transferring their listing to the New York Stock Exchange from NYSE Arca will not pay an initial listing fee, nor will they be subject to a prorated annual fee for the first partial calendar year.

“NYSE Group believes that NYSE Arca’s affiliation with the exchange through their common parent is attractive to companies considering a listing on NYSE Arca, especially to companies whose ultimate objective is to list on the exchange,” it said.