CSN files 2009 Form 20-F


NOTICE TO THE MARKET

Companhia Siderúrgica Nacional – CSN, [BM&FBovespa: CSNA3, NYSE: SID], company that combines steel, mining, cement, logistics and energy businesses, informs the filing of its Form 20-F (the “2009 Form 20-F”) for the fiscal year ended December 31, 2009 with the U.S. Securities and Exchange Commission (the “SEC”). The 2009 Form 20-F will be available on both the SEC‘s website at www.sec.gov, as well as on the Company‘s website at www.csn.com.br/ir.

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