• UBS (UBS) warns escalating Iran conflict threatens major market bets, with disruption in the Strait of Hormuz as the critical factor.
  • Tanker traffic through the strait has halted, surging oil prices and stranding hundreds of vessels.
  • High equity valuations leave markets exposed to reversals in popular trades like large vs. small cap and growth vs. value.

Oil tanker traffic through the Strait of Hormuz's main lanes stopped on March 1 amid Iranian IRGC warnings and attacks on vessels, with shipping activity down 40-70% and over 240 ships clustered nearby, mostly non-crude laden. At least three tankers were hit, including one ablaze off Oman, prompting Maersk (MAERSK-B.CO) and others to suspend transits; container ships (170 vessels, 450,000 TEUs) are also stranded inside the Gulf. Brent crude jumped 10-13% to around $82 per barrel, with fears of $100+ if prolonged.

UBS strategist Bhanu Baweja highlighted the risks in a recent note, cautioning that even partial supply blockages could hit oil and global markets hard, as supply is useless if it can't reach buyers. "The strait handles about 20% of global crude and significant LNG, so disruptions strand supplies from key exporters like Saudi Arabia and Iraq," Baweja said, according to people familiar with the matter. Efforts to reroute via Africa's Cape add weeks and costs, inflating global freight rates and overwhelming bypass pipelines.

Without a swift resolution, the crisis could force a reassessment of popular financial trades. UBS flags that today's high equity valuations leave markets more exposed, with potential reversals in bets on large vs. small cap and growth vs. value. Bond steepener positions and expectations of a weaker dollar also face risks from rising energy costs, which could spur inflation and tighter monetary policy. "How long shipping is disrupted will drive market impact," Baweja emphasized, noting that risks are higher than in recent Iran-Israel tensions.

The political backdrop adds urgency. US-Israel joint strikes on February 28 reportedly killed Iran's Supreme Leader Ali Khamenei, prompting Iranian missile and drone retaliation on Israel and US Gulf bases. IRGC radio warnings claim the strait is "closed," though not formally declared, according to sources monitoring the situation. The US advises against transit; UK officials note no official closure but high volatility from miscalculations and interference. Insurance rates have spiked, barring US- and Israel-linked ships from the area.

In the short term, vessel-by-vessel routing decisions will dictate supply flows, with prices potentially hitting $100 per barrel if the blockade lasts days or weeks. Traders and insurers see multiplied premiums, while energy importers in Europe and Asia face higher fuel costs and potential shortages. A spokesperson for Maersk declined to comment on specific transit plans but confirmed suspensions are in place. Attempts to reach Iranian officials for clarification were unsuccessful.

This crisis echoes historical flashpoints like the 1980s Tanker War but has escalated faster due to the leadership vacuum in Tehran. As container lines also halt Red Sea transits, stranding over 750 Gulf ships in total, the global supply chain faces unprecedented strain. Bottom line: markets are on edge, with the duration of disruption set to determine whether this becomes a fleeting spike or a sustained shock.