Activist investor Palliser Capital doubled down on its call for a review of Rio Tinto’s dual listing in London and Sydney, adding that it now has the backing of more than 100 shareholders.

The U.K.-based hedge fund said Thursday it plans to move a resolution at the miner’s next annual general meeting which would direct the board to conduct an independent review into whether unification of Rio Tinto’s structure is in the best interests of its shareholders, and to share the review with the market.