Pentwater weighs legal action over Rio Tinto-Turquoise Hill deal

 Pentwater Capital Management, the second-largest shareholder of Turquoise Hill Resources, said on Friday it opposes Rio Tinto's acquisition of the Canadian miner, and was weighing legal options to thwart the deal.

The activist investor added that it now owns 11.67% of Turquoise Hill's shares, after buying a further 1.73% stake on the open market.