The world's oil stockpiles could approach all-time lows by the end of May due to the Strait of Hormuz closure, according to UBS.

Global demand is facing constraints because supply from the Persian Gulf has been effectively cut off by Iran's blockade of the Strait of the Hormuz.

Consumers have tapped surplus oil-on-water and near-record stocks to mitigate supply losses from Hormuz's near-closure. But such draws are becoming unsustainable.