With the United States moving to blockade the Strait of Hormuz after failing to secure a cease-fire agreement with Iran, the three major indexes on the New York stock market were mixed. All three opened lower early in the session, but the Standard & Poor's (S&P) 500 index and the Nasdaq composite turned higher.
As of 12:43 p.m. on the 13th (local time) at the New York Stock Exchange, the Dow Jones Industrial Average was down 28.51 points, or 0.060%, at 47,888.06. The S&P was up 22.66 points, or 0.33%, at 6,839.55, and the Nasdaq composite was up 121.49 points, or 0.53%, at 23,024.38.
The United States began the blockade of the Strait of Hormuz at 11 p.m. on the 13th Korea time. It was a response to the collapse of cease-fire talks between the United States and Iran held on the 11th–12th.
U.S. President Donald Trump, in line with this, wrote on the social media (SNS) platform Truth Social, "If any one of the Iranian vessels approaches our blockade line (the waters subject to the blockade), we will immediately neutralize it at sea with the lethal weapons used to seize narcotics-smuggling ships." U.S. Central Command warned that the blockade of the Gulf of Oman and the Arabian Sea east of the Strait of Hormuz applies to all vessel traffic regardless of flag, and that any vessel entering the blockade area without permission or departing from that area will be subject to interdiction, diversion, or seizure.