Palliser Capital, an activist investor with a stake of approximately $250 million in Rio Tinto, is advocating for the company to abandon its dual listing in London and focus solely on its primary listing in Sydney.

As part of its growth initiatives, Rio Tinto aims to reach one million tons of copper production by 2030, highlighting its focus on materials essential for the global energy transition.

Stausholm maintains that the dual listing benefits the company, despite Palliser's claims that the arrangement is outdated and inefficient.

The investor argues that the current dual listing structure has led to a staggering loss of $78 billion in shareholder value and a $56 billion decline in book value due to barriers in mergers and acquisitions.

Palliser believes that consolidating under a single Australian listing could potentially add around $43 billion to Rio Tinto's market value.

This push for a primary listing shift comes amid a broader trend of companies relocating their main listings from London, with BHP's transition to Sydney in 2022 serving as a key example.

The disparity in share prices is notable, as Rio's Australian shares trade at an 18% premium to its London shares, contributing to an estimated $22 billion in lost value.

The company is also pursuing significant projects like the Oyu Tolgoi copper mine and the Simandou iron ore project in Guinea, alongside expanding its lithium business through the acquisition of Arcadium.

However, CEO Jakob Stausholm has resisted calls to unify the listings, citing potential costs of approximately $5 billion in taxes and arguing that the current structure allows for better dividend availability in Australia.

The London Stock Exchange, historically a hub for mining companies, faces the potential loss of Rio Tinto, following BHP's earlier departure, which would leave only Glencore and Anglo American as major mining players.

In response to the declining number of listed companies, UK regulators are reviewing London's listing rules to attract more IPOs, while Prime Minister Keir Starmer has called for reduced regulatory burdens to stimulate growth.

This situation reflects a wider trend across Europe, where companies feel undervalued and are seeking better opportunities elsewhere, further complicating the landscape for London as a financial center.