Hormuz Oil Flow Drop: Investor Price Impact

Iranian attacks on tankers have slashed ship-to-ship oil transfers in the Gulf of Oman to near zero, cutting total Hormuz throughput to roughly 14 million barrels per day – about two-thirds of pre-conflict volumes.

For energy investors, the sharp drop in transfer activity threatens to reverse weeks of painstaking progress in restoring Gulf export flows, with direct implications for oil price volatility and the earnings of tanker operators exposed to the region.

Key Takeaways

Supertanker crossings fell from eight daily to just two this week.
Satellite data shows only one tanker pair transferring oil on July 18.
U.S. says combined waterway and bypass flow near 14 million bpd.

Market Reaction & Context

The slowdown marks a sharp reversal from the cadence established since early May, when a U.S. military-assisted ship-to-ship (STS) transfer operation helped move tens of millions of barrels out of the Gulf, dampening what officials called the largest-ever disruption in oil and gas supplies ¹. Ship broker Clarksons said on Monday that supertanker crossings through the Strait of Hormuz averaged just two per day over the past week, down from five the prior week and eight daily crossings recorded in late June and early July ¹.

Each supertanker carries a maximum of two million barrels, meaning the week-on-week decline alone represents a potential loss of up to six million barrels of daily shipping capacity through the strait. The figures add urgency to concerns already flagged when the Strait of Hormuz crisis began jeopardizing oil recovery earlier this month.

Detailed Analysis

Since hostilities began in late February, STS transfers have served as the primary mechanism for getting Gulf crude past the strait’s hazards. Under the arrangement, tankers shuttle cargoes through the waterway via makeshift routes hugging either the Iranian or Omani coastline, handing off loads to vessels waiting in open water beyond the strait ¹.

The latest satellite imagery reviewed by Reuters from July 18 showed just one pair of tankers conducting an STS transfer off Oman’s coast, down from three pairs visible on July 11 ¹. Two maritime sources told Reuters that only two or three STS transfers were believed to have taken place in the preceding days – a fraction of the pace seen earlier in the summer.

Iran’s Revolutionary Guards declared on Monday that two oil tankers had “exploded” and been immobilised after attempting to transit via what they called an “unsafe” route ¹. The attacks have rattled shipping companies, with several now refusing to participate in the U.S. military-guided transit scheme, according to sources who spoke to Reuters last week. This dynamic echoes broader energy supply risk concerns that have intensified since drone attacks began intensifying oil supply concerns across global markets.

Satellite outages and restricted public ship-tracking data have complicated independent verification of flow volumes. The gap between official U.S. figures and publicly available tracking data is now itself a market variable investors must account for ¹. The revocation of Iran oil licenses earlier in the conflict added a further layer of complexity to the sanctions and supply picture.

Outlook & Management Quote

U.S. Energy Secretary Chris Wright pushed back on public tracking data, saying the figures he had seen were “incorrect.” Speaking on ABC News on Sunday, Wright said the seven-day trailing average showed just under seven million barrels per day flowing through the waterway, with a roughly equal volume moving through bypass pipelines ¹.

“So, we’re at a little under 14 million barrels a day… That’s two-thirds of pre-conflict traffic, dramatically up from where we were back in March,” Wright said.

Wright added that Washington would continue to assure traffic through the strait “without Iran’s cooperation.” Whether shipping companies accept the security assurances – or continue to pull back from U.S.-escorted transits – will be the pivotal near-term variable for oil supply continuity.

Conclusion

The near-collapse of STS transfer activity exposes how fragile the U.S.-engineered workaround remains in the face of sustained Iranian interdiction. For deal-focused energy investors, tanker stocks with Hormuz exposure face elevated event risk, while any renewed escalation could swiftly tighten the crude supply outlook and support oil prices. The combination of restricted strait crossings, a dwindling STS pipeline, and official data that diverges sharply from public tracking feeds creates a high-uncertainty environment that markets will struggle to price with precision.

Not investment advice. For informational purposes only.