ˆ200F4SiTSmCf0j!ZMŠ 200F4SiTSmCf0j!ZM NY8690AM021467 OI S.A. RR Donnelley ProFile11.9.13 NCR keebj0nm19-May-2016 17:10 EST 171431 FS 1 8* FORM 20-F NYC HTM ESS 0C Page 1 of 2 As filed with the Securities and Exchange Commission on May 20, 2016 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, 2015 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 The Federative Republic of Brazil (Translation of Registrant’s Name into English) (Jurisdiction of Incorporation or Organization) Rua Humberto de Campos, 425 Leblon, Rio de Janeiro, RJ, Brazil 22430-190 (Address of Principal Executive Offices) Flavio Nicolay Guimarães Investor Relations Officer Rua Humberto de Campos, 425 8º andar Leblon, Rio de Janeiro, RJ, Brazil 22430-190 Tel: +55 21 3131-2918
[email protected] ˆ200F4SiTSmCf0j!ZMŠ 200F4SiTSmCf0j!ZM NY8690AM021467 OI S.A. RR Donnelley ProFile11.9.13 NCR keebj0nm19-May-2016 17:10 EST 171431 FS 1 8* FORM 20-F NYC HTM ESS 0C Page 2 of 2 (Name, Telephone, E-mail and/or Facsimile number and Address of Company Contact Person) Securities registered or to be registered