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) -- Shares of

Nielsen Holdings

(NLSN) - Get Nielsen Holdings Plc (NLSN) Report


Demand Media


are surging in their first day trading on the New York Stock Exchange.

Nielsen's shares opened at $24.75, above its

initial offering price range of $20 to $22 per share


Shares of the media ratings company are trading up more than 10.5% to $25.43 on volume of 45.4 million.

Nielsen's offering is one of at least seven U.S. IPOs scheduled for this week,


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data shows.

Demand Media, an online content company, also debuted on the NYSE today. The company's common stock opened at $23.50, well above

its initial offering price of $14 to $16 a share


The stock reached a high of $25 in morning trading and is currently up almost 35% to $22.88. So far over 9.3 million shares have traded hands.

--Written by Theresa McCabe in Boston.

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Disclosure: TheStreet's editorial policy prohibits staff editors and reporters from holding positions in any individual stocks.