
CNBC· June 20, 2026
Iran Shuts Strait of Hormuz Again, Threatening Oil Markets
Iranian military forces have once again blocked the Strait of Hormuz, a narrow waterway through which roughly 20% of the world's oil supplies pass. The official justification cited Israel's ongoing military campaign in Lebanon. The closure came just as U.S. Vice President JD Vance was heading to Switzerland for diplomatic talks, immediately casting doubt on their prospects. Oil prices reacted sharply upward as market participants priced in the risk of Middle Eastern supply disruptions. For investors in energy assets and oil company equities, the situation remains highly uncertain. An escalation of the conflict could also disrupt global supply chains and amplify inflationary pressures.