Oil Prices Surge and Stocks Fall as US Threatens Strait of Hormuz Blockade
- Global energy markets experienced a sharp surge on April 13, 2026, as the United States military began implementing a blockade of Iranian ports.
- Central Command announced that the blockade of all maritime traffic entering and exiting Iranian ports would take effect on April 13, 2026, at 10 a.m.
- Military clarified that it will not impede vessels transiting to and from non-Iranian ports.
Global energy markets experienced a sharp surge on April 13, 2026, as the United States military began implementing a blockade of Iranian ports. The move follows the collapse of peace negotiations between the U.S. And Iran in Pakistan over the preceding weekend.
U.S. Central Command announced that the blockade of all maritime traffic entering and exiting Iranian ports would take effect on April 13, 2026, at 10 a.m. ET. The military stated that the blockade would be enforced impartially against vessels of all nations departing or entering Iranian coastal areas, including ports on the Gulf of Oman and the Arabian Gulf.
The U.S. Military clarified that it will not impede vessels transiting to and from non-Iranian ports. However, President Donald Trump stated via a social media post that he ordered the Navy to interdict any ship in international waters that has paid a toll to Iran to transit the Strait of Hormuz.
Energy Market Impact
Crude oil prices reacted immediately to the escalation. U.S. Crude oil futures for May delivery rose over 8% to $104.8 per barrel by 12:49 a.m. ET on April 13, 2026. The international benchmark Brent for June delivery increased 7.38% to $102.2.
Other energy commodities also saw significant price spikes. Wholesale gas prices rose 6%, while heating oil, which serves as a proxy for jet fuel prices, jumped 10% in early trading.
The volatility follows a period of extreme price fluctuations. Brent crude had topped $119 in March 2026 but fell below $92 a barrel during the previous week after the U.S. And Iran announced a two-week ceasefire following more than six weeks of war.
Financial Market Contraction
Equity markets declined sharply in response to the blockade and the resulting energy crisis. Stock futures indicated a 1% drop for the S&P 500 and a 1.3% slide for the Nasdaq 100. Dow futures tumbled by more than 500 points.
Asian markets also traded lower as the impact of the blockade on Iranian ports became clear to global investors.
Strategic Context of the Strait of Hormuz
The Strait of Hormuz is a critical conduit for approximately one-fifth of the world’s oil and natural gas supplies. Market analysts from JPMorgan Chase identified the reopening of the strait as the most time-sensitive priority for the market.
The global supply chain is facing a critical window. According to JPMorgan Chase, the last tanker to clear the strait on February 28, 2026, is expected to reach its destination around April 20, 2026. This date marks the point at which pre-closure barrels are expected to be fully exhausted from the global supply chain.
Shipping volume through the strait had already plummeted before the current blockade. While hundreds of ships passed through daily before the war began on February 28, 2026, most days since then have seen fewer than 10 ships pass. Last week, only 24 ships passed through the strait out to the ocean.
Military and Diplomatic Developments
The current blockade is a response to the failure of ceasefire talks. President Trump announced the move on Truth Social, stating:
Donald Trump
Effective immediately, the United States Navy, the Finest in the World, will begin the process of BLOCKADING any and all Ships trying to enter, or leave, the Strait of Hormuz
The Wall Street Journal reports that the President is also considering limited strikes on Iran. This follows a period where Tehran had imposed a de facto blockade of the Strait of Hormuz after U.S.-Israeli strikes on Iran.