Indicate by check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.  

NOTICE TO THE MARKET

COMPANHIA SIDERÚRGICA NACIONAL, pursuant to paragraph 6 of article 12 of CVM Instruction 358/2002, as amended, hereby announces that, on this date, it received the following communication from Rio Purus Participações S.A., its indirect controlling shareholder, stating that the shareholding structure set forth in item 4 of the communication sent on December 1, 2015 contains incomplete names and typing errors in the “Percentage Share” column:.

“RIO PURUS PARTICIPAÇÕES S.A., a private legal entity constituted in the form of a closely-held corporation, whose articles of incorporation are filed with the São Paulo State Registry of Commerce under Corporate Registry Inscription no. 35-3.0035514-8, with headquarters at Rua Henrique Schaumann, 270/278, Sobreloja, Sala Rio Purus, CEP 05413-010, in the city and state of São Paulo and inscribed in the Finance Ministry’s roll of corporate taxpayers (CNPJ) under no. 60.078.060/0001-59, herein represented by its articles of incorporation (henceforth simply “Rio Purus”), in reference to the communication sent yesterday (the “Communication”), hereby declares that the shareholding structure set forth in item 4 of the Communication contains incomplete names and typing errors in the “Percentage Share” column, and asks that you instead consider the table below, which corrects that sent yesterday:

In relation to all of the above, we request that you take all the appropriate measures arising from the information contained herein.

We remain at your disposal for any further information you may need”.

São Paulo, December 2, 2015

Companhia Siderúrgica Nacional

Gustavo Henrique Santos de Sousa

Executive Officer