Over
that time, 80% of the small number of oil tankers exiting the strait
have been Iranian — or belong to countries with which it is on cordial
terms, the figures show. ...
Out of the 110 individual ships that left the gulf this month, more than
36% were sanctioned Iranian ships or part of the so-called dark fleet
serving Tehran, data compiled by Bloomberg show. For oil tankers, 21 out
of 35 that have exited had direct Iranian ties — but most of the
remainder went to nations with whom Tehran has a friendly relationship.
Until this war, one long-held assumption around Hormuz was that Iran would never attempt to close the strait, for fear of risking its own exports, a vital economic lifeline. In fact, ship-tracking data suggest that Tehran’s oil has continued to flow — almost entirely to China — even as other ships are stranded and producers in the region have been left scrambling for alternatives or forced to stop producing as storage fills up.
Iran exported roughly 1.8 million barrels a day this month, a nearly 8%
increase from its average over 2025, according to figures from data
intelligence firm Kpler as of March 26. That likely facilitated hundreds
of millions of dollars of oil revenue for Tehran, a Bloomberg News
analysis shows. ...
More.