NOTICE TO THE MARKET - Change in the Annual Calendar of Corporate Events

RIO DE JANEIRO, May 11 /CNW/ - HRT Participações em Petróleo S.A. (the "Company" or "HRT") announces that the disclosure of its Quarterly Information (ITR) for the first quarter of 2011, previously scheduled for May 12, 2011, as disclosed in its annual calendar of corporate events, has been postponed to May 14, 2011. This postponement is due to the suspension of the Board of Directors' Meeting that began on May 10, 2011, which, among other matters, would examine said ITR. The meeting was suspended during the examination of the contracting of 2D seismic acquisition, prior to the deliberations on the ITR, and will resume on May 13, 2011.

As a result, it became necessary to postpone the conference call with analysts to May 18, 2011 at 10:00 a.m. (ET) in English and 12:00 noon (ET) in Portuguese that had originally been scheduled for May 13, 2011.

The Company also announces that the updated annual calendar of corporate events, reflecting the above-mentioned changes, is available for consultation on the CVM-IPE-System (filing System for the Brazilian Securities and Exchange Commission). This update can be accessed on the websites of the Securities and Exchange Commission of Brazil - CVM (www.cvm.gov.br), the BM&FBOVESPA S.A. - Securities, Commodities and Futures Exchange (www.bmfbovespa.com.br) and the Company (www.hrt.com.br/ir).

About HRT

HRT Participações holds one of the largest independent oil and gas exploration and production companies in Brazil. The HRT Group is comprised of three main subsidiaries: IPEX (Integrated Petroleum Expertise Company Serviços em Petróleo Ltda.), HRT O&G Exploração e Produção de Petróleo Ltda. and HRT Netherlands B.V. The Company retains a 55% interest in 21 exploratory blocks in the Solimões Basin. HRT also operates ten exploratory blocks on the Namibian coast, two of them in the Walvis Sub-basin and eight in the Orange Sub-basin. HRT's team includes PhDs and Masters in geochemistry, geophysics, biology and engineering, most of which are former employees of Petrobras and Agência Nacional do Petróleo, Gás Natural e Biocombustiveis ("ANP") the Brazilian petroleum agency. HRT is committed to minimizing environmental impacts and improving health, security and overall quality of life in the communities where we operate.

For further information, please contact HRT's Investor Relations department or visit our website at www.hrt.com.br/ir.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.


SOURCE HRT Participações em Petróleo S.A.

For further information:

Marcio Rocha Mello - CEO and Investor Relations Officer
+55 21 2105-9700
ri@hrt.com.br

Eliana Rodriques - IR Manager 
+55 21 2105-9745
eliana.rodrigues@hrt.com.br

Profil de l'entreprise

HRT Participações em Petróleo S.A.

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