At least three Iranian tankers carrying nearly five million barrels of crude oil have exited the U.S. Navy blockade in the Strait of Hormuz, marking the first outbound shipment from Iran in two months as a landmark U.S.-Iran nuclear deal moves toward formal signing in Geneva on Friday.

Market Context

The developments come after Washington and Tehran signed a Memorandum of Understanding on Monday to end nearly four months of hostilities that effectively shut the Strait of Hormuz—the corridor through which roughly one-fifth of the world's oil flowed prior to the conflict. The U.S. Navy has maintained a blockade of Iranian ports, while Iran targeted vessels linked to nations it deemed adversaries, stranding hundreds of ships and sending shockwaves through global energy markets.

Analysis

Two supertankers—Diona and Hero 2—both owned by the National Iranian Tanker Company (NITC) and under U.S. sanctions, successfully navigated the Navy blockade perimeter carrying a combined 3.8 million barrels of Iranian crude, according to shipping data from Kpler. A third Iran-linked tanker transporting one million barrels exited the blockade line on Wednesday.

The maritime sector is treating these movements with "wary disbelief rather than celebration," according to Lloyd's List Intelligence analysts, who noted that while a pause in hostilities will free stranded mariners and boost tanker and bulk markets, industry participants view this as a fragile reprieve rather than a return to normality.

"Their apparent departure from the blockade suggests that other Iranian-trading tankers are also preparing to resume trading," said Michelle Wiese Bockmann, senior maritime intelligence analyst at Windward. The prospect of reopening has prompted some shipowners—battered by months of surging freight costs and war-risk insurance premiums—to begin repositioning vessels toward Gulf ports in anticipation of a surge in restocking demand.

However, most operators remain cautious. Insurers are holding firm on elevated war-risk premiums, demanding "solid evidence" that the waterway will remain safe before easing coverage terms. The U.S. Navy has reminded the industry that "nothing has changed and will not until the agreement is signed," said Tim Wilkins, managing director of Intertanko.

For now, traffic through the strait is expected to remain minimal with both blockades remaining in effect until Friday's formal signing ceremony. BIMCO chief shipping analyst Niels Rasmussen noted that most shipowners "appear to be cautiously awaiting more details before planning new transits" and will seek reassurance that passages are not only permitted but safe.

Key Numbers

- 4.8 million barrels: Total crude oil carried by three Iranian tankers exiting the blockade this week

- 3.8 million barrels: Combined cargo on supertankers Diona and Hero 2, both NITC-owned and U.S.-sanctioned

- 118 laden tankers: Estimated number that could exit the region within 15 days after deal signing, per Kpler

- ~20%: Share of global oil flow that transited Strait of Hormuz before hostilities began

- 30+ ships: Number already at anchor near UAE ports as owners position for potential surge in demand

What to Watch

Friday's formal signing ceremony in Geneva will be the pivotal catalyst. If the agreement holds, expect a coordinated release of stranded vessels and a sharp normalization of freight rates that have spiked on war-risk premiums. Monitor Baltic Dirty Tanker Index readings in coming weeks for signs of sustainable demand recovery versus one-time backlog clearance. Energy sector investors should watch for U.S. Treasury guidance on sanctions waivers affecting NITC and related entities, as well as International Energy Agency projections on Iranian production resumption timelines.

Lloyd's List Intelligence analysts cautioned that the anticipated traffic surge is likely a "one-time event rather than a durable recovery," suggesting traders should differentiate between structural demand improvement and temporary logistical normalization when positioning in maritime equities.