At the very end of March 2026, base metals markets are undergoing a sharp divergence as copper prices soften while aluminum remains supported by supply constraints. This shift follows a period of record volatility and reflects a broader transition from synchronized bullish momentum to fragmented, asset-specific drivers. Rising inventories and macroeconomic uncertainty are beginning to weigh on copper, while geopolitical risks continue to underpin aluminum markets. The result is a more complex trading environment where traditional correlations across base metals are breaking down.
Natalie Scott-Gray, Giles Plumb and Paul Ridd have extensive experience managing copper trading flows through volatile macro cycles. Their roles are to provide direct insight into how inventory shifts, fund positioning, and currency moves are influencing price action in real time.
Key Themes from the Discussion
Copper inventories rise from roughly 90,000 to 300,000 tonnes, shifting spreads from backwardation into contango.
Aluminum remains supported by Middle East supply disruption despite broader bearish sentiment across base metals.
Breakdown in copper and aluminum correlation reflects competing forces of supply risk and weakening macro demand.
Copper Inventories Rise and Pressure Market Structure
Copper market structure is shifting toward oversupply as visible inventories increase and spreads move into contango. Giles Plumb notes that "we've now got about 300,000 tons available" compared to significantly lower levels previously, highlighting the scale of the build in London Metal Exchange stocks. This transition from backwardation to contango reflects weakening near-term demand and reduced urgency for physical supply. Consequently, copper prices are becoming more sensitive to macro drivers such as currency strength and liquidity conditions rather than purely fundamental tightness. As inventories continue to build, copper markets may face further downside pressure unless demand conditions improve.
Aluminum Supply Risk Sustains Divergence From Copper
Aluminum prices remain supported by geopolitical supply risks even as broader base metals sentiment weakens. Paul Ridd explains that "aluminum... has been the metal that stands out" due to Middle East supply exposure and logistical constraints affecting a significant portion of global production. This supply-driven resilience contrasts sharply with copper’s inventory-driven weakness, resulting in a breakdown of the typical positive correlation between the two metals. As a result, aluminum markets are increasingly reacting to regional disruptions and supply chain risks rather than global demand signals. This divergence highlights how localized supply shocks can override broader macro trends, creating uneven performance across the base metals complex.
Base Metals Correlation Breakdown Signals Market Fragmentation
Base metals markets are entering a more fragmented phase as traditional correlations weaken under competing macro and supply forces. Giles Plumb observes that "Ali is behaving as erratically as copper does", underscoring how both metals are now highly reactive to headlines rather than stable macro trends. This shift is driven by a combination of geopolitical uncertainty, investor positioning, and conflicting signals between supply tightness and demand risks. Consequently, traders can no longer rely on historical relationships between metals to guide positioning or hedging strategies. Instead, market participants must assess each metal independently, as divergence becomes a defining feature of the current environment.
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--- Expert: Giles Plumb, StoneX Head of Base Metals Trading
--- Expert: Paul Ridd, Stonex Base Metals, Sales & Trading
Base Metals
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