SAO PAULO--Brazilian shares opened higher Friday, led by TIM Participacoes SA (TIMP3.BR, TIM), after a report the mobile phone company will be the target of a takeover offer by other telecommunications companies.

The benchmark Ibovespa stocks index rose 0.4% to 50526 points.

Italy's Il Sole 24 Ore newspaper said Telefonica SA of Spain, Oi SA and Claro are seeking to buy TIM, which is Brazil's second-biggest mobile phone company. Tim shares rose 5.9% to BRL12.83 and Oi shares advanced 4.9% to BRL3.67.

Other Brazilian blue-chips were mixed.

Retail bank Itau fell 0.1% to BRL31.49 and rival Bradesco fell 0.9% to BRL28.66. Iron-mining giant Vale fell 0.6% to BRL3175 and oil company Petrobras declined 0.4% to BRL16.68. Power company Cemig rose 1.6% to BRL13.99 and steel-maker CSN gained 1.5% to BRL14.25.

Write to Jeffrey T. Lewis at jeffrey.lewis@wsj.com

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