425

Filed by Oi S.A.

Pursuant to Rule 425 of the Securities Act of 1933

Subject Company: Oi S.A.

Commission File No.: 001-15256

THE FOLLOWING ARE MATERIALS MADE PUBLIC BY OI S.A. RELATING TO THE PROPOSED MERGER OF SHARES (INCORPORAÇÃO DE AÇÕES) BETWEEN TELEMAR PARTICIPAÇÕES S.A. (“TMARPART”) AND OI S.A. (“OI”).


EXHIBIT INDEX

 

Exhibit
Number

  

Description of Document

1    Material Fact, dated September 8, 2014 (English translation).