PHAROL, SGPS, S.A.

Regulatory Filings • Feb 27, 2016

Announcement | Lisbon 27 February 2016

Notice to the Market disclosed by Oi

PHAROL, SGPS S.A. hereby informs on the Notice to the Market disclosed by Oi, S.A., according to the company's announcement attached hereto.

PHAROL, SGPS S.A.

Public company Share capital Euro 26,895,375 Registered in the Commercial Registry Office of Lisbon and Corporation no. 503 215 058 PHAROL is listed on the Euronext (PHR). Information may be accessed on Bloomberg under the symbol PHR PL.

Luis Sousa de Macedo Investor Relations Director ir@pharol.pt Tel.: +351 212 697 698 Fax: +351 212 697 949

Oi S.A. Corporate Taxpayers' Registry (CNPJ/MF) No. 76.535.764/0001-43 Board of Trade (NIRE) No. 33.300.29520-8 Publicly-Held Company

NOTICE TO THE MARKET Ratings

Oi S.A. (BOVESPA: OIBR3, OIBR4; NYSE: OIBR.C, OIBR) (the "Company" or "Oi") discloses to its shareholders and the market in general that Standard & Poor's announced today its review of the credit rating attributed to the Company, downgrading the long-term global scale credit rating from BB- to B+ and the long-term domestic scale credit rating from brA- to brBBB-, with negative CreditWatch.

Additionally Oi informs that Fitch announced today its review of the credit rating attributed to the Company, downgrading the long-term global scale credit rating from BB to B and the long-term domestic scale credit rating from AA- to BBB-, with negative Rating Watch.

Rio de Janeiro, February 26, 2016

Flavio Nicolay Guimarães Chief Financial Officer and Investor Relations Officer Oi S.A.