Commodity weekly: October underscores a year of dramatic sector rotation

Elsewhere, agriculture has delivered a mixed performance, with sugar among the strongest gainers, while grains have suffered renewed selling pressure as the speculative long positions built up during August continue to unwind. Wheat and corn have been weighed down by harvest-related supply pressure, shifting trade expectations and the liquidation of previously elevated speculative positions. Sugar, meanwhile, has benefited from weather-related supply concerns and strong speculative interest, although the recent sharp depreciation of the Brazilian real has weighed on several major Brazilian agricultural exports, including sugar, soybeans, coffee and cotton. A weaker real improves the competitiveness of Brazilian produce in international markets, adding downward pressure to US dollar-denominated prices.

Precious metals have experienced an ongoing sharp reversal, with silver and platinum among October's biggest losers, while gold has also weakened. The sector has faced pressure from spikes in bond yields and shifting interest-rate expectations, which have increased the opportunity cost of holding non-yielding assets. At the same time, concerns about global growth and the sustainability of AI-related investment have weighed disproportionately on silver and platinum, given their industrial demand exposure. Elevated speculative positioning following earlier rallies has amplified the correction, with technical breaks triggering additional long liquidation and momentum-driven selling.

Industrial metals, meanwhile, have held up relatively well despite concerns about slowing economic growth, softer Chinese demand and uncertainty surrounding US trade policy. Copper has been particularly influenced by rising exchange-monitored inventories and speculation over potential US tariffs on refined imports, while longer-term demand expectations linked to electrification and infrastructure investment continue to provide some underlying support.

The scale of this year's rotation is even more striking when viewed against last year's performance. Precious metals, which topped the commodity rankings in 2025 with gains of around 80%, have become this year's laggard, currently down approximately 11%. Conversely, energy, which lost around 10% last year, has surged by almost 100% year-to-date, driven primarily by war-related supply disruptions and sharply higher prices for crude oil and refined products.

These dramatic reversals highlight both the opportunities and risks associated with commodity investing. Individual commodity markets are driven by very different combinations of supply constraints, weather, geopolitics, inventory developments and investor positioning. In my opinion, this strengthens the case for broad commodity exposure rather than relying on a narrow selection of markets, as diversification can help smooth the impact of sharp sector-specific reversals, even though it cannot eliminate the risk of losses across the asset class.

The broader lesson from 2026 is that commodity performance is rarely uniform. War has reshaped energy markets, weather and harvest cycles have influenced agriculture, while inflation, bond yields, growth expectations and speculative positioning have driven sharp adjustments in metals. With these forces likely to remain influential, sector rotation may continue to be as important as the overall direction of the commodity market.