The Strait Is Closed Again: Why the Third Hormuz Cycle Is the Most Dangerous for Canadian Portfolios

The pattern has repeated three times in eight weeks, and each repetition is teaching the market something important. When the Strait of Hormuz opened on April 17, the TSX erased all of its crisis losses in a single session. When Iran closed it again on April 18, citing the U.S. refusal to lift its naval blockade, those gains began unwinding immediately. By Tuesday close the TSX was at 33,808, down 551 points, with crude oil holding near $90/barrel. The market is no longer treating Hormuz reopenings as durable events. That repricing of resolution risk is the most significant geopolitical development of the week, and it has direct implications for how Canadian advisors should be framing portfolio positioning conversations with clients.

Why the Third Closure Changes the Strategic Picture

The first two Hormuz closures, in late February and again in mid-March, could reasonably be characterized as Iran establishing its leverage before negotiations. The third closure is different in kind, not degree. It occurred after a formal reopening declaration, after tanker traffic had begun to normalize, and after global oil markets had already priced in significant relief. Iran reversed course within 24 hours of the reopening announcement, and did so in direct response to a specific U.S. action: the continued maintenance of a naval blockade around Iranian ports. This sequence reveals the precise shape of the negotiating impasse.

Iran’s position, based on statements from its foreign ministry, is that the Strait remains closed until the U.S. naval presence outside Iranian ports is removed. The U.S. position, maintained through this week, is that the naval presence stays until Iran provides verifiable security guarantees for commercial shipping. These are not positions that split the difference easily. Each side’s demand is the precondition the other side refuses to accept. Without a mediating framework that breaks this deadlock, either through a direct U.S.-Iran agreement or through a third-party guarantee backed by a party Iran trusts, such as China or Russia, the open-close cycle will continue.

The Fertilizer Shock: The Secondary Risk Nobody Is Pricing

Oil gets the headlines, but fertilizer may be the more consequential long-duration disruption. The Strait of Hormuz is central to the global fertilizer trade: over 30% of global urea, the most widely used nitrogen fertilizer, is exported from Gulf states through the strait. Qatar, Saudi Arabia, and the UAE are major urea producers, and their shipments to Asia, South America, and North America have been severely disrupted since late February. The Food Policy Institute in London has warned that global fertilizer prices could average 15% to 20% higher during the first half of 2026 if the disruption continues.

The timing is acute. Spring planting season in North America runs from approximately April through June. Corn, the primary feedstock for U.S. beef, poultry, and dairy, requires nitrogen fertilizer at planting. If farmers reduce planted acreage or apply reduced fertilizer rates due to price or supply constraints, the yield impact flows through to food prices with a six-to-nine-month lag. The IEA has flagged fertilizer as a category without internationally coordinated strategic reserves, meaning there is no mechanism analogous to the Strategic Petroleum Reserve to buffer a supply shock. If the Hormuz closure persists through May, food inflation that begins appearing in late 2026 and into 2027 is a plausible secondary consequence that is not yet priced into markets or inflation forecasts.

What a Durable Resolution Requires

The conflict’s resolution path runs through a specific set of conditions. The U.S. must be willing to draw down its naval presence outside Iranian ports, which requires either a negotiated security framework or a unilateral decision by the Trump administration that Iran’s strategic leverage has been sufficiently degraded. Iran must be willing to provide shipping security guarantees that are verifiable and credible to insurers, who are the practical gatekeepers for tanker movement: a declaration without insurer sign-off does not restore traffic. A third-party mediator with credibility in Tehran is the missing piece that has not yet entered the public negotiations.

For Canadian advisors, the practical implication is that the conflict’s duration should be measured in months, not weeks. The open-close cycle will likely continue through the spring, with crude prices remaining elevated in the $85 to $100 range absent a genuine breakthrough. Canadian energy producers benefit directly from that range. The broader Canadian economy faces a continued inflation headwind, a delayed rate cut trajectory, and the emerging fertilizer-to-food transmission risk that markets have not yet fully incorporated. Advisors with clients asking when this ends should be honest: the structural conditions for resolution are not yet in place, and positioning for a prolonged period of elevated energy prices is the more prudent planning framework.