The Obstacles to Rio Tinto’s Proposed Acquisition of Glencore
Deal Overview
Acquirer: Rio Tinto plc (London, UK) and Rio Tinto Limited (Melbourne, Australia), together the Rio Tinto Group.
Target: Glencore plc.
Total Transaction Size: Estimated combined market cap of approximately ~US$207 billion at the time.
Transaction Structure: An all-share scheme of arrangement merger was discussed, although no formal structure was announced as discussions were only exploratory.
Public Announcement: Early 2026 media reports revealed discussions of a merger. Official confirmation came on 8 January 2026.
Completion: No formal agreement was signed and discussions ended before a binding deal was reached.
This report provides a timeline of events and analyses the principal legal and regulatory issues that would likely have arisen had the transaction proceeded. The analysis relies primarily on company announcements, stock exchange filings and regulatory guidance, supplemented by reporting from major financial publications including Reuters and the Financial Times. Important information gaps remain as the deal was not consummated.
Company Details: Acquirer
Rio Tinto, founded in 1873 and headquartered in London, is one of the world’s largest diversified mining companies. At the time of the merger discussions, the company had a market cap of approximately ~US$142 billion and was led by Chief Executive Jakob Stausholm.
The company operates a portfolio of large-scale, long-life mining assets and is widely regarded as a Tier 1 producer. Its business is dominated by iron ore operations in the Pilbara region of Western Australia, although it also produces copper, aluminium and lithium.
In recent years, Rio Tinto has sought to reposition its portfolio towards commodities linked to the global energy transition, particularly copper and lithium. The company exited thermal coal production in 2018 and increased its focus on metals associated with electrification and renewable energy supply chains.
Rio Tinto has also faced heightened environmental and governance scrutiny following the destruction of the Juukan Gorge rock shelters in 2020, an event that prompted significant reputational damage and internal governance reforms.
Company Details: Target
Glencore, founded in 1974 and headquartered in Baar, Switzerland, is a global mining and commodities trading company. At the time of the merger discussions, the company had a market cap of approximately ~US$65 billion and was led by Chief Executive Gary Nagle.
Unlike most major mining companies, Glencore operates a hybrid business model combining ownership of mining assets with one of the world’s largest commodity trading and marketing divisions.
Its mining portfolio includes significant production of copper, cobalt, zinc and coal, while its trading arm plays a central role in global metals and energy markets.
Glencore has maintained substantial exposure to thermal coal, arguing that these assets generate strong cash flows while global demand declines only gradually. This stance may contribute to a share price discount due to ESG concerns, as investors assign Glencore a lower valuation than peers that have exited coal production.
The company has also faced regulatory scrutiny in recent years and has paid out major settlements to US and UK authorities concerning bribery and market manipulation investigations.
Deal Overview
Timeline
In early 2026, Rio Tinto and Glencore confirmed that they had entered into confidential discussions regarding a potential merger. The deal was widely expected to be structured as an all-share transaction, implemented by way of a court-sanctioned scheme of arrangement.
As Glencore plc is incorporated in Jersey, the scheme would have been carried out under Articles 125–127 of the Companies (Jersey) Law 1991, broadly equivalent to Part 26 of the UK Companies Act 2006. In practice, the process mirrors a UK scheme. Glencore would have applied to the Jersey Royal Court to convene a shareholder meeting, at which approval would require both a majority in number of shareholders present and voting and those shareholders representing at least 75 per cent in value of the shares voted. If approved, the scheme would then return to court for sanction. Once sanctioned and registered, it would become binding on all Glencore shareholders worldwide, including those who voted against it or abstained.
The discussions took place within the framework of the UK City Code on Takeovers and Mergers, which applied because Glencore’s shares are listed on the London Stock Exchange.
Under Rule 2.6 of the Code, Rio Tinto was subject to a strict ‘put up or shut up’ deadline, giving it 28 days from the announcement on 8 January 2026 to either announce a firm intention to make an offer or withdraw. On 5 February 2026, Rio Tinto issued a Rule 2.8 statement confirming that it did not intend to make an offer. This triggered a six-month standstill, preventing Rio Tinto from making a further approach. (subject only to limited exceptions such as a competing bid or a material change in circumstances)
Rio Tinto stated that it had been unable to reach an agreement that would deliver sufficient value to its shareholders. Glencore likewise confirmed that no agreement had been reached. As a result, no merger agreement or draft transaction documentation was ever made public.
When the talks were confirmed in January 2026, Glencore shares rose sharply while Rio Tinto fell, reflecting market expectations of a premium for Glencore and concern that Rio might overpay. When Rio announced on 5 February 2026 that it would not proceed, Glencore shares fell by as much as 10.8%, and Rio Tinto also declined by about 1.4%. The market response suggests that the collapse was clearly negative for Glencore, but not that Rio’s shareholders positively re-rated the outcome on immediate relief from regulatory risk.
Motivation
The proposed combination would have created a meaningful degree of concentration across multiple commodity segments, with the clearest impact in copper. According to the U.S. Geological Survey, global copper mine production reached 23 million metric tonnes in 2024. Against that backdrop, Rio Tinto’s 697,000 tonnes of mined copper production and Glencore’s 951,600 tonnes of own-sourced copper output would together have represented roughly 1.65 million tonnes, or just over 7% of global supply.
Copper’s increasing importance as a strategic industrial metal helps explain the commercial rationale behind potential consolidation among large mining companies. Industry forecasts suggest that global copper demand may increase by approximately 50% by 2040, rising from roughly 28 million tonnes today to around 42 million tonnes.
Several structural factors are driving this expected growth. First, the global energy transition is expected to significantly increase copper consumption. Renewable energy infrastructure, electricity transmission networks and electric vehicles require substantial quantities of copper. Electric vehicles typically contain three to four times more copper than conventional ICE-powered vehicles.
Secondly, rapid expansion in artificial intelligence infrastructure and data centres is increasing demand for electrical transmission capacity. Large-scale data centres require extensive cabling, transformers and grid connections, all of which rely heavily on copper.
Thirdly, copper is increasingly viewed as a strategic mineral in defence and national security policy. Modern defence systems rely on advanced electronics and communications infrastructure that incorporates copper-based components.
Finally, traditional industrial demand, particularly from China, continues to underpin global consumption. China remains the largest consumer of refined copper and accounts for a significant proportion of global demand through construction, manufacturing and infrastructure investment.
Integration
A scheme of arrangement would almost certainly have been preferred over a contractual offer, as it delivers full ownership automatically. This avoids the execution risk associated with the 90% acceptance threshold required for squeeze-out under a traditional offer, which is particularly relevant given Glencore’s large and geographically diverse shareholder base.
A key obstacle in the discussions was the gap between the parties’ respective valuations and views on governance. In particular, Glencore indicated that Rio had proposed retaining both the chair and Chief Executive roles, alongside a pro forma ownership split. In Glencore’s view, this materially undervalued its contribution even before any control premium was considered. This suggests that integration issues were not limited to structure, but extended to leadership, control and the post-merger balance of influence between the two groups.
Legal & Regulatory Issues
Competition and Merger Control
Had the transaction progressed beyond preliminary discussions, it would likely have faced serious scrutiny under merger control and foreign investment regimes. That would not necessarily have made the deal unworkable, but it would have increased execution risk, timing pressure and remedy exposure.
Copper would have been the obvious focus. A combined share of a little over 7% of global mined copper output would not suggest an obvious prohibition case. But that figure would not have settled the issue. In merger control, the real question is usually not the headline global share, but the relevant product and geographic market and whether the transaction removes an important competitive constraint in any of them.
That makes market definition central. Authorities could have looked at global mined copper, copper concentrate, refined copper, or narrower regional supply markets. For a transaction of this kind, the risk would have been that a deal that appeared unobjectionable at a global level might look more concentrated in a narrower frame. particularly where the parties have significant overlapping assets, export routes or customer relationships.
The analysis would also not have stopped at mining output. Glencore’s trading and marketing arm could have widened the enquiry beyond simple asset overlap. The combination of Rio Tinto’s production base with Glencore’s trading platform may have prompted questions about market influence, customer access and information advantages, even if the merged group’s global production share remained relatively modest.
The principal theory of harm would likely have been horizontal consolidation in the copper mining and supply industries. Competition authorities may have been concerned that combining the parties’ production assets would increase concentration in relevant copper markets and weaken existing competitive constraints on price and supply.
Authorities may also have examined potential vertical concerns arising from Glencore’s commodity trading operations. Glencore operates one of the world’s largest metals marketing businesses, purchasing, transporting and selling copper concentrate and refined metal. Integrating Rio Tinto’s production assets with that network could have given the merged entity enhanced market intelligence or greater influence over supply flows. Regulators may therefore have considered whether the transaction might disadvantage competing producers or traders through preferential access to supply or commercially sensitive information.
Regional concentration would also have been relevant, particularly in Chile and Peru, where both companies operate major copper mines. Even if global market shares appeared manageable, authorities may still have considered whether the parties were close competitors in specific regional or supply markets.
Jurisdictional Review Risk
In the European Union, the Commission would have applied the SIEC test under the EU Merger Regulation. The question is whether the concentration would significantly impede effective competition in the internal market, or a substantial part of it.
That test is broader than a pure dominance test. The Regulation states that a merger may be incompatible, in particular where it creates or strengthens a dominant position and the Commission’s horizontal merger guidelines make clear that it can also catch a merger that removes an important competitive constraint without producing classic dominance. In this case, that would have kept the focus on whether the parties constrained each other in any plausible copper market and whether the structure of the deal changed competitive incentives more broadly.
In the United States, a review would likely have proceeded under section 7 of the Clayton Act. The statutory test asks whether the effect of the acquisition may be substantially to lessen competition, or to tend to create a monopoly, in any line of commerce and in any section of the country.
That standard is deliberately forward-looking. It allows challenge before harm is certain, and it allows the agencies to focus on any relevant market in which competition may be materially weakened. For this transaction, that would again have made market definition critical. A modest global share would not have precluded scrutiny if the agencies identified a narrower product or geographic market where rivalry was reduced.
In the United Kingdom, the CMA would have applied the substantial lessening of competition test under the Enterprise Act 2002. That is a flexible standard and, in practice, would have allowed the CMA to examine both direct overlap and any wider effects arising from control over supply, trading channels or customer access. Even if no single jurisdiction raised a decisive objection, the deal would still have faced the burden of parallel review and the risk of different authorities taking different views of market definition, timing and remedies.
In addition to review in the EU, UK and US, Chinese merger control may also have required close attention.
Any filing would have been reviewed by the State Administration for Market Regulation, or SAMR, under the Anti-Monopoly Law of the People’s Republic of China as a concentration of undertakings. The relevance of the Chinese review would have depended on the transaction’s effect on the Chinese market and the parties’ turnover from sales into China.
Given Rio Tinto’s substantial supply relationships with Chinese buyers and Glencore’s extensive China-facing customer base, particularly in copper and iron ore, SAMR clearance may well have presented a material execution issue. Adding a further layer of parallel review and the possibility of behavioural remedies, even if global market shares appeared modest.
Substantively, SAMR’s analysis would not have turned on any fixed market-share threshold. The review is conducted on a case-by-case basis and in strategic sectors, and is likely to focus on supply security, the distribution of influence across the supply chain and the effect of the transaction on Chinese customers.
In the mining context, that means even a transaction involving relatively modest market shares may still attract scrutiny where it could affect access to supply, pricing dynamics or the stability of resource flows into China. That approach is consistent with China’s willingness to intervene in transactions involving strategic resources when broader economic interests and domestic competitive conditions are at stake.
Foreign Investment and Strategic Minerals Scrutiny
Separate from merger control, the deal may also have engaged foreign investment and national security review. In the United States, CFIUS is authorised to review certain foreign investment transactions to assess their effect on national security. In Australia, official guidance indicates that mining investments involving critical minerals are generally subject to closer scrutiny under the foreign investment regime, even where ordinary screening thresholds still apply. For a transaction involving large copper positions and strategically important mining assets, that would have added a further layer of execution complexity.
The legal and regulatory issues would not necessarily have been obvious grounds for prohibition. The stronger point is that the deal would likely have encountered cumulative regulatory friction: multiple legal tests, multiple authorities and several plausible theories of harm, any one of which could have prolonged review or led to remedies. That is the better way to understand the regulatory risk around a near-merger of this kind.
Diligence and Governance Overhang
A Rio Tinto-Glencore merger would also have raised material diligence and governance issues. These would not necessarily have prevented a deal, but they would have increased execution risk and expanded the range of matters requiring detailed legal and regulatory review.
On Glencore’s side, the main issue would have been the continuing governance overhang arising from its recent enforcement history, including major resolutions with US and UK authorities concerning bribery and market manipulation. Importantly, the UK position cannot be treated as entirely historic: the Serious Fraud Office still lists its Glencore group investigation as open.
Advisers would therefore have needed to consider not only historic liabilities, but also any continuing cooperation obligations, residual exposure and related disclosure requirements.
Rio Tinto’s governance profile presents a different set of issues. The destruction of the Juukan Gorge rock shelters in 2020 continues to affect the company’s stakeholder position, particularly in relation to Indigenous relations, cultural heritage management and social licence. In the mining sector, these issues can influence project approvals, community relations and overall transaction certainty.
Accordingly, if the merger had advanced, these matters would likely have shaped due diligence, risk disclosure, integration planning and the negotiation of provisions relating to litigation, remediation and stakeholder management. They are best understood not as automatic barriers to completion, but as factors that would have added materially to execution complexity and pricing.
House View
The attempted merger between Rio Tinto and Glencore should not be read simply as a failed transaction. It is better understood as a marker of where mining M&A is heading. The deal fell away, but the forces behind it did not. Consolidation pressure is rising, copper is becoming more strategic and scale is increasingly being used as protection as much as a route to growth.
Three conclusions stand out:
First, consolidation pressure is real. The capital needed to bring large copper projects into production has risen sharply and the investment burden is now concentrated at the top end of the market. The International Energy Agency estimates that copper carries the largest mining capital requirement among the major transition minerals through 2040. That helps explain why scale is becoming more attractive, and why the Rio-Glencore talks sit comfortably within a wider pattern of miners looking for size, diversification and project depth.
Second, copper has taken on a more strategic role than in previous cycles. It is still an industrial metal, but it now sits much more closely to energy policy, industrial strategy and infrastructure security. The IEA says copper alone could reach the scale of today’s iron ore market by 2040 in net-zero scenarios, which helps explain why control of supply is drawing more attention from governments as well as investors.
Third, scale is becoming a defensive attribute. Export restrictions on critical raw materials have increased more than fivefold since 2009, according to the OECD, with a marked acceleration in 2023. That does not address strategic concerns in mining, but it does show that resource security is now being managed more actively across borders and supply chains. In that environment, larger and more diversified mining groups are better placed to absorb disruption, political intervention and shifts in state policy.
For Rio Tinto, the collapse of the talks sharpens the case for internal delivery and selective acquisitions rather than another transformative merger. The strategic logic still points towards more copper and battery materials, but by cleaner and more controllable routes. In practical terms, that means increasing copper output from Oyu Tolgoi, extracting value from existing lithium investments and looking at copper-heavy deals that are easier to execute and easier to defend. That approach fits a market in which growth still matters, but execution risk and political sensitivity matter more than before.
Glencore’s position remains more complicated. It has valuable copper exposure and a trading platform few peers can match, but its coal portfolio still shapes how the market values it and how counterparties assess its strategic options. That leaves coal as both a source of cash and a structural complication. From a legal and market perspective, simplification remains the variable to watch. If Glencore can more clearly separate, ring-fence, or reduce its coal exposure, it will improve its room for manoeuvre in any future strategic process.
Ultimately, although the deal collapsed, the commercial and strategic pressures that drove it, namely copper scarcity, consolidation economics and defensive scale, remain firmly in place and are likely to continue reshaping the sector through more targeted and more executable transactions.
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