Norway’s $2.7 trillion sovereign wealth fund will vote against a push to collapse Rio Tinto’s dual-company structure and unify in an Australian entity as proposed by activist British hedge fund Palliser Capital.

But other big global pension funds are supportive of the plan, including those representing Californian teachers and public servants, which would end a structure in place since 1995. London shareholders are voting on the motion, which would force Rio to launch a strategic review of its structure, on Thursday. Investors on the ASX will vote at the start of May.