Aramco: Strait of Hormuz Closure Could Trigger Global Oil ‘Catastrophe’

Executive summary

Saudi Aramco warns that a prolonged closure of the Strait of Hormuz would create a global oil-market catastrophe, with immediate and sustained supply shocks that could push prices materially higher and amplify volatility across equities and fixed income. The company expects to restore roughly 70% of its usual crude export capacity by rerouting flows through the east–west pipeline to Yanbu, but long-term closure of the strait would exceed available pipeline capacity and emergency stock buffers.

> "There would be catastrophic consequences for the world’s oil markets, and the longer the disruption goes on … the more drastic the consequences for the global economy."

Key facts and quick data

• Current transit disruption: tanker traffic through the Strait of Hormuz fell from roughly 100 vessels per day to single digits after military strikes in the region.
• Immediate supply gap: an estimated ~20 million barrels per day (bpd) of crude supply has been removed from the global market while the strait remains closed.
• Aramco mitigation capacity: the east–west pipeline to Yanbu has a full capacity of 7 million bpd. Aramco plans to ramp shipments to that level within days.
• Expected allocation at full pipeline capacity: ~2 million bpd to Saudi western refineries and ~5 million bpd for export markets (about 70% of the kingdom’s typical exports).
• Price action: Brent crude traded near a weekly high close to $119/bbl, later pulling back to about $85/bbl (a roughly 14% decline) after signs the conflict could de-escalate. Pre-attack benchmark levels were near $72/bbl.
• Security escalation: statements from regional militias have threatened vessels transiting the route, contributing to the sharp drop in tanker transits.

Market reaction: equities, commodities and volatility

• Equities: relief and re-risking moves lifted major European indices—FTSE 100 (FTSE) +1.6%, DAX (DAX) +2.4%, CAC (CAC) +1.8%—with early gains also visible in US markets (US) as conflict expectations shifted.
• Commodities and volatility: Brent and other crude benchmarks spiked on the initial supply shock, then retraced on de-escalation signals; energy-sector volatility and cross-asset intraday swings remain elevated.

Mitigation capacity and limits

• Pipeline rerouting provides immediate mitigation but is constrained: the 7m bpd east–west pipeline can offset a large share of lost exports in the near term, but it cannot replace the full volume historically moved through Hormuz if the closure persists beyond weeks.
• Stored inventories: floating and onshore stocks are being used to fill the gap, but inventories are finite and cannot substitute for continuous flows over the medium term.
• Structural shortfall risk: with ~20m bpd of seaborne crude at risk and only ~5m bpd of export capacity freed for global markets via Yanbu, a prolonged closure would leave a material, multi-million-barrel-per-day deficit.

Emergency reserves and policy levers

• IEA emergency buffer: IEA member countries hold more than 1.2 billion barrels of public oil reserves plus roughly 600 million barrels of industry stocks held under government obligation; the IEA requires members to hold at least 90 days of emergency crude supplies.
• Non-IEA buffers: estimates indicate China may hold up to 1.4 billion barrels in reserves, representing additional global buffer capacity outside the IEA framework.
• Policy actions: coordinated releases of strategic petroleum reserves (SPRs) are a historically used tool but are finite and have been deployed only a limited number of times. Multilateral leaders have requested scenario planning for possible releases; an actual coordinated release would be an intervention to address acute shortages but not a long-term substitute for lost flows.

Implications for professional traders and institutional investors

• Price sensitivity and triggers:
• Watch daily tanker transit counts and Aramco pipeline throughput versus the 7m bpd target.
• Inventory reports from OECD and large non-OECD holders and observed changes in global floating storage will drive price moves.
• Positioning and risk management:
• Consider reducing net-long exposure if de-escalation signals strengthen; conversely, maintain stop and contingency plans for size increases if transits or pipeline flows deteriorate.
• Energy risk can spill into equities (FTSE, DAX, CAC, US), FX and sovereign credit spreads; implement cross-asset hedges where correlation regimes shift.
• Volatility and liquidity:
• Expect elevated intraday volatility in energy futures, energy-sector equities and related derivatives while the strait remains contested.
• Options strategies should account for higher implied vols and the potential for abrupt directional moves.

Data watchlist (priority)

• Daily tanker transit counts through the Strait of Hormuz and port call data.
• Aramco east–west pipeline throughput and ramp progress toward 7m bpd.
• Brent and regional crude spreads, global floating storage metrics.
• IEA inventory and emergency reserve deliberations; OPEC+ production statements.
• Insurance and freight-rate signals (shipping risk premia).

Bottom line

A sustained closure of the Strait of Hormuz would represent a material supply shock: roughly 20 million bpd removed from seaborne crude flows cannot be fully replaced by the 7m bpd east–west pipeline and finite strategic reserves. Short-term mitigation can blunt the initial shock, but persistent disruption would sustain upward pressure on prices, increase volatility across markets and create broader economic downside. Traders and institutional investors should prioritize real-time supply metrics, pipeline throughput updates and IEA reserve deliberations when sizing exposure and structuring hedges.