Unlike commercial inven - tories, the SPR is explicitly a policy instrument. Originally, it was designed as an emer - gency buffer, and it has evolved into a market-stabi - lisation tool during periods of heightened volatility and geo - political uncertainty. Several characteristics distinguish the SPR as cen - tralised ownership, explicit policy intent, high transpar - ency through pre-announced actions, strong institutional credibility, and close integra - tion with financial markets. Together, these features have allowed the SPR to influence markets well before any phys - ical barrel movement (see Figure 3 ). In volumetric terms, SPR
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US SPR China SPR
Before adjustment After adjustment
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Releases from US SPR and high China inventories are affective factors
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2016: OPEC cut 1.2M b/d (Algiers A ccord)
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End of 2025: OPEC voluntary cut 2.2M b/d additional cuts announced
2025: OPEC Eight countries maintain cut ~5.85M b/d total reduction
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2014: OPEC no cut despite glut
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2020: OPEC cut 9.7M b/d during COVID-19
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Figure 1 Comparison of historical oil price responses with major OPEC production adjust - ments, highlighting the growing role of inventories in moderating and reshaping price outcomes. The lines between markers represent the path between the main adjustments via OPEC actions and do not necessarily reflect actual price patterns
inventories directly influence crude intake. Operating simul - taneously across these mechanisms, inventories serve as market state variables that shape how other fundamentals are interpreted and priced. Ignoring them risks misreading both the direction and the timing of market adjustment (see Figure 2 ). The inventory channel The inventory channel can be understood as a three-stage transmission process linking production and consump - tion fundamentals to observable market behaviour. Firstly, changes in production or consumption alter supply-de - mand balances. Secondly, those imbalances are absorbed into, or released from, inventories. Thirdly, inventory levels, changes, and expectations influence prices, futures curves, refinery margins, and observed demand. What distinguishes the current market environment is that the inventory mediation stage is no longer neutral. Strategic decisions regarding when to store, release, or signal inven - tory changes can materially influence price formation even when underlying flow imbalances remain unchanged. This framework helps explain why prices may stay sub - dued despite production cuts, why volatility can rise in peri - ods of stable supply, and why refining margins can diverge from crude balances. It also clarifies how market sentiment can shift ahead of physical data. The inventory channel does not replace flow-based anal - ysis, but it reframes it. Thus, production still matters, while its impact on prices is progressively filtered through the pre - vailing inventory environment. SPR and the expectation-driven channel The US SPR occupies a unique position in global oil markets. Although its physical volume is modest relative to global consumption, its transparency, credibility, and policy-driven nature give it outsized influence on price formation.
releases are insufficient to rebalance global supply and demand. Instead, their influence operates through expecta - tions. Oil prices reflect anticipated balances, risk premia, and policy responses, not just physical flows. Announcements regarding releases, refilling plans, or policy shifts can mate - rially move prices even when volumes are limited. These signals affect futures curves, compress or steepen time spreads, and alter volatility. Clear and predictable policy communication dampens uncertainty, while ambiguous or politicised signals tend to amplify it. The SPR actions are also interpreted as macro-pol - icy signals, as energy prices play a central role in inflation expectations. This can further magnify their market impact. China as a structural inventory actor China’s influence on oil markets operates through a funda - mentally different mechanism. While the US acts through transparent signalling, China exerts influence through phys - ical absorption and release, often with limited visibility. This makes China central to the realised balance channel. Over the past two decades, China has become the world’s largest crude importer and one of its largest holders of inven - tories. This rise coincided with rapid refinery expansion and an increased willingness to use stockpiling as both a policy and commercial tool. As a result, China’s inventory behav - iour shapes global balances in ways that often become visi - ble only after they have already affected the market. Blurred boundaries Unlike the clearly defined SPR, China’s inventory system blends strategic and commercial stocks. Strategic storage exists alongside inventories held by state-owned enter - prises, independent refiners, and trading entities. The bound - ary between policy stockpiling and commercial optimisation is often indistinct. This structure enables quiet accumulation during periods of low prices, allows commercial inventories
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PTQ Q3 2026
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