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:

“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”), hereby announces the following:

1.     As resolved by a Rio Purus Extraordinary Shareholders Meeting held on November 19, 2015, all the preferred shares issued by Rio Purus were converted into common shares. As a result of said conversion, Rio Purus’ capital stock is now represented by one billion, four hundred and four million, two hundred and forty thousand, five hundred and ninety-five (1,404,240,595) registered common shares with no par value.

2.    Due to the death of Dorothéa Steinbruch on November 11, 2015, all the shares held by her (702,191,372 common shares) are now registered in the name of Estate of Dorothéa Steinbruch, until the distribution of the estate, when they will be bequeathed to her heirs. In addition, the usufruct she retained over a further 702,046,223 common shares¹ ceased to exist, the ownership of said shares being transferred to her eleven (11) grandchildren with the institution of lifetime usufructs in favor of her three (3) children, all of which under the terms and conditions set forth in the provisions of the Foundation created by Dorothéa Steinbruch regarding the destination of part of her estate.

3.    It is worth noting that the lifetime usufruct constituted in favor of Benjamin Steinbruch, Elisabeth Steinbruch Schwarz and Ricardo Steinbruch over the 702.046.223 common shares includes the possession, use, management and reception of any benefits arising from said shares, including all their inherent political and ownership rights.

4.    Given the above, the capital stock of Rio Purus is now distributed as follows:

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 1, 2015

Companhia Siderúrgica Nacional

Gustavo Henrique Santos de Sousa

Executive Officer