Overview of the current Iranian crude situation
Recent data from AXS Marine (up to 15 August 2026) shows that the principal obstacle to the movement of Iranian crude is no longer the lack of demand in Asia but the accumulation of cargoes at the Strait of Hormuz. While Asian on‑water inventories have been contracting, Iranian barrels are gathering in the Gulf region, creating a distinct supply‑side bottleneck.
Inventory trends in Asian waters versus the Gulf
Iranian crude held in Asian waters peaked at 44.4 million barrels in December 2025 and fell to 22.8 million barrels by February 2026 – a 48 % drop in just two months. The decline was short‑lived; inventories began to climb again from March onward, reaching 46.0 million barrels by the end of July, surpassing the previous December high.
The resurgence coincided with the U.S. sanctions waiver that opened on 22 June. Although the waiver lasted only three weeks, it accelerated a refill that had already started, achieving in one month what the prior four months had achieved cumulatively.
Regional dynamics
During the same period, total crude on‑water volumes in Asia fell 23.6 % between January and July 2026. Both floating storage (down 30.6 %) and crude in transit (down 19.0 %) moved in tandem, indicating that barrels were not simply changing state but genuinely disappearing from the market.
July marked a brief surge in cargo movements – up 22.4 % on June – but August saw a sharp slowdown, confirming that the bottleneck is now centred on the strait rather than on downstream demand.
Floating‑to‑transit ratio highlights prolonged dwell time
Dividing floating storage by crude in transit provides an approximate “dwell time” indicator. For three years the ratio hovered around 0.50. Since October 2025 it has averaged 0.63, the highest level recorded in the past three years. Eight of the eleven months since October 2025 have posted ratios of 0.61 or higher, a stark contrast to the single month in the preceding 33‑month window that reached this level.
Geographical split at Hormuz
On 15 August, 39.8 million barrels were located east of Hormuz in the Gulf of Oman, while 37.1 million barrels remained west of the strait – a total of 76.9 million barrels on 47 vessels, seven‑in‑ten of which were VLCCs.
West of Hormuz, cargoes sit on larger parcels: 21 hulls (17 VLCCs) averaging 1.77 million barrels each. East of the strait the cargoes are broken into smaller units – 26 hulls averaging 1.53 million barrels. Within Asia, the fleet grew from 18 to 34 hulls during the waiver window, with the average parcel shrinking to 1.35 million barrels, reflecting a shift toward ship‑to‑ship redistribution rather than bulk storage.
What the August slowdown really means
In August, floating storage fell 7.6 % while crude in transit dropped 18.9 %. The floating‑to‑transit ratio rose, but the increase stems from a sharper fall in transit volumes, not from a buildup of storage. The data therefore points to a temporary pause in movements rather than a new, larger stockpile.
For shippers, charterers, and traders, the key takeaway is that the strategic chokepoint has shifted. With the Strait of Hormuz now the primary constraint, timing of sailings, charter selections, and contingency planning around the strait will dominate operational decisions for Iranian crude through the remainder of 2026.