Apresentação oi

As filed with the Securities and Exchange Commission on April 30, 2013

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 20-F
REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934
OR

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 2012
OR

⌧

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
OR

SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission file number: 001-15256

OI S.A.
(Exact Name of Registrant as Specified in Its Charter) N/A
(Translation of Registrant’s Name into English)

The Federative Republic of Brazil
(Jurisdiction of Incorporation or Organization)

Rua do Lavradio, No. 71, 2nd floor – Centro 20230-070 Rio de Janeiro, RJ, Brazil
(Address of Principal Executive Offices)

Alex Waldemar Zornig Investor Relations Officer Rua Humberto de Campos, 425 8º andar Leblon, Rio de Janeiro, RJ, Brazil 22430-190 Tel: [phone] [e-mail] (Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to section 12(b) of the Act:
Title of Each Class Name of Each Exchange on which Registered

Common Shares, without par value, each represented by American Depositary Shares Preferred Shares, without par value, each represented by American Depositary Shares

New York Stock Exchange New York Stock Exchange

Securities registered or to be registered pursuant to Section 12(g) of the Act: None Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act: None The total number of issued shares of each class of stock of Oi S.A. as of December 31, 2012 was: 599,008,629 common shares, without par value 1,198,077,775 preferred shares, without par value Indicate by check mark if the