In New York, ADRs of the Brazil's state-run run oil company were trading down 3.19% at midday on the news. Shares of parent company Dryships were trading down 3.3% at midday in New York, while Ocean Rig's Nasdaq listing was trading down 0.25%.

The contract would have hired five rigs capable of drilling in 3000 metres of water, the Brazilian state-run company said in a news release late Thursday.

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