Notice to the Market - Cancellation of the Special Shareholders´ Meeting to take place on September 13, 2011 and Announcement of Convocation for a new Special Shareholders´ Meeting to take place on October 07, 2011

RIO DE JANEIRO, BRAZIL, Sept. 2, 2011 /CNW/ - HRT Participações em Petróleo S.A. (the "Company" or "HRT") (BM&FBOVESPA: HRTP3) (TSXV: HRP), announces that, on August 10, 2011, the BM&FBOVESPA S.A. - Bolsa de Valores, Mercadorias e Futuros ("BM&FBOVESPA") required that the Company implemented new alterations to the Company By-Laws which are listed below, with the objective to adapt the Company By-Laws to the new dispositions of the Novo Mercado Listing Rules ("Novo Mercado"). The said alterations to the By-Laws are:

(a)      Insertion of a new sole paragraph in the Article 1 in compliance with section 1.1 of the new rules of the Novo Mercado;
       
(b)      Amendment to the Article 15 in compliance with section 4.7 of the new rules of the Novo Mercado;
       
(c)      Amendment to the Article 22, XXIX in compliance with section 4.8.1 of the new rules of the Novo Mercado;
       
(d)      Amendment to the Article 38, §2º in compliance with section 5.3 of the new rules of the Novo Mercado;
       
(e)      Amendment to the Article 46 (ii) in compliance with section 8.2(ii) of the new rules of the Novo Mercado;
       
(f)      Amendment to the Article 49 in compliance with section 10.2 of the new rules of the Novo Mercado;
       
(g)      Amendment to the Article 50 in compliance with section 11.2 of the new rules of the Novo Mercado;
       
(h)      Deletion of Article 53, due to its inapplicability in light of the new rules of the Novo Mercado;
       
(i)      Amendment to the Article 54 in compliance with section 12.5.2.1 of the new rules of the Novo Mercado;
       
(j)      Amendment to the Article 59 in compliance with section 13.1 of the new rules of the Novo Mercado;

Pursuant to the Board Meeting held on August 31, 2011, the Board of Directors of the Company analyzed the requirement made by BM&FBOVESPA and, in order to attend the request, the Board decided to cancel the Special Shareholders´ Meeting convened to take place on September 13, 2011 and to convene a new Special Shareholders´ Meeting to take place on October 07, 2011, at 11a.m. ("Shareholder´ Meeting on October 07, 2011").

The Announcement of Convocation for the Shareholder´ Meeting on October 07, 2011, containing the agenda that will be submitted for shareholder´s approval was published today in the Brazilian newspapers named Diário Oficial do Estado do Rio de Janeiro and Brasil Econômico. The Announcement of Convocation and the Management Proposal in connection to the Shareholder´ Meeting on October 07, 2011 are available for consultation on the following websites: Brazilian Securities and Exchange Commission, Comissão de Valores Mobiliários - CVM (www.cvm.gov.br); São Paulo Stock Exchange - BM&FBOVESPA (www.bmfbovespa.com.br) and the Company´s website (www.hrt.com.br/ri).

For further information, contact HRT`s Investor Relations Department.

About HRT

HRT Participações holds one of the largest independent oil and gas exploration and production companies in Brazil. The HRT Group comprises eight main subsidiaries: IPEX (Integrated Petroleum Expertise Company Serviços em Petróleo Ltda.), HRT O&G Exploração e Produção de Petróleo Ltda., HRT Netherlands B.V., HRT África Petróleo S.A., HRT América Inc., BN47 Serviços Aéreos Ltda., Ranger Participações Ltda. and UNX Energy Corp. The Company retains a 55% interest in 21 exploratory blocks in the Solimões Basin. HRT also operates ten exploratory blocks at the Namibian coast, where it retains interest in two of them, in the Walvis Sub-basin, and in other eight, in the Orange Sub-basin. HRT's team includes PHDs and masters in geochemistry, geophysics, biology and engineering, most of them former employees of Petrobras and ANP (Brazil petroleum agency). HRT is committed to minimizing any possible environmental impacts in the sites where it acts. Our commitment to the local communities is towards health conditions, security and quality of life. For more information, please visit the Company's website: www.hrt.com.br/ir

Disclaimer

This news release contains forward-looking statements. All statements other than statements of historical fact contained in this news release are forwardlooking statements, including, without limitation, statements regarding our drilling and seismic plans, operating costs, acquisition of equipment, expectations of finding oil, the quality of oil we expect to produce and our other plans and objectives. Readers can identify many of these statements by looking for words such as "expects", "believe", "hope" and "will" and similar words or the negative thereof. Although management believes that the expectations represented in such forward-looking statements are reasonable, there can be no assurance that such expectations will prove to be correct. By their nature, forward-looking statements require us to make assumptions and, accordingly, forward looking statements are subject to inherent risks and uncertainties. We caution readers of this news release not to place undue reliance on our forward-looking statements because a number of factors may cause actual future circumstances, results, conditions, actions or events to differ materially from the plans, expectations, estimates or intentions expressed in the forward-looking statements and the assumptions underlying the forward-looking statements.

The following risk factors could affect our operations: the contingent resource and prospective resource evaluation reports involving a significant degree of uncertainty and being based on projections that may not prove to be accurate; inherent risks to the exploration and production of oil and natural gas; limited operating history as an oil and natural gas exploration and production company; drilling and other operational hazards; breakdown or failure of equipment or processes; contractor or operator errors; non-performance by third party contractors; labour disputes, disruptions or declines in productivity; increases in materials or labour costs; inability to attract sufficient labour; requirements for significant capital investment and maintenance expenses which HRT may not be able to finance; cost overruns and delays; exposure to fluctuations in currency and commodity prices; political and economic conditions in Namibia and Brazil; complex laws that can affect the cost, manner or feasibility of doing business; environmental, safety and health regulation which may become stricter in the future and lead to an increase in liabilities and capital expenditures, including indemnity and penalties for environmental damage; early termination, non-renewal and other similar provisions in concession contracts; and competition. We caution that this list of factors is not exhaustive and that, when relying on forward-looking statements to make decisions, investors and others should also carefully consider other uncertainties and potential events. The forward-looking statements herein are made based on the assumption that our plans and operations will not be affected by such risks, but that, if our plans and operations are affected by such risks, the forward-looking statements may become inaccurate.

The forward-looking statements contained herein are expressly qualified in their entirety by this cautionary statement. The forward-looking statements included in this news release are made as of the date of this news release. Except as required by applicable securities laws, we do not undertake to update such forward-looking statements.

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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