National Stock Exchange, Inc. (NSX(R)) announced that assets in U.S. listed Exchange-Traded Funds (ETF) and Exchange-Traded Notes (ETN) totaled approximately $798 billion at May 2010 month-end, an increase of almost 34% over May 2009 month-end when assets totaled $594.3 billion. At the end of May 2010, the number of listed products totaled 995, compared to 829 listed products at the end of May 2009.

May 2010 net cash inflows from all ETFs/ETNs totaled approximately $6.3 billion, with year-to-date net cash inflows reaching $27.6 billion.

This data is included in the full NSX May 2010 Month-End ETF/ETN Data Report released by the Exchange, which has become a key industry source for ETF/ETN data. These Data Reports are published following the end of each calendar month.

To view the full reports go to: http://www.nsx.com/content/market-data. NSX also publishes a product-by-product breakdown of the 995 products on which the data is based. The complete list can be accessed at: http://www.nsx.com/content/etf-product-list.

The NSX monthly statistics include shares of open-end exchange-traded products, encompassing U.S. listed shares of investment companies, grantor trusts, ETNs and commodity pools.

NSX is the cost-effective provider of exchange services, committed to aligning its interests with those of its customers. Acknowledged for its proven high-performance, low-latency technology, NSX is also a recognized resource for Exchange-Traded Fund (ETF) data. For more information on NSX, visit www.nsx.com.

SOURCE National Stock Exchange, Inc.

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