U.S. stocks jumped Friday after Iran declared the Strait of Hormuz “completely open” to commercial shipping, removing one of the biggest overhangs that had weighed on markets for weeks.
The move, announced on X by Iranian Foreign Minister Seyed Abbas Araghchi, came hours after a fragile 10-day ceasefire between Israel and Lebanon took hold and amid fresh signals from President Donald Trump that the wider conflict with Iran could be winding down fast.
The Dow Jones Industrial Average surged 702 points, or 1.5 percent. The S&P 500 rose 0.8 percent, and the Nasdaq Composite climbed 1 percent. At the open, the gains were already solid, with the Dow ahead 515 points (1.1 percent), the S&P 500 up 0.6 percent, and the Nasdaq gaining 0.9 percent. For the full week, the major indexes posted their strongest showing in some time: the Dow added 1.4 percent, the S&P 500 climbed 3.3 percent, and the Nasdaq jumped 5.2 percent.
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Smaller companies stole the show. The Russell 2000 punched through to a fresh all-time high early in the session, trading above 2,750 and eclipsing its previous record of 2,735 set back on January 22. The index has now roared back about 14 percent from its March 30 lows, outpacing the broader market and signaling that investors are suddenly far more willing to embrace riskier, domestically focused names now that the immediate threat of prolonged energy chaos has receded.
The diplomatic sequence that triggered the rally unfolded quickly. Trump announced Thursday that Israel and Lebanon had agreed to the ceasefire, effective at 5 p.m. Eastern. He followed up at an event in Las Vegas by saying the Iran conflict “should be ending pretty soon” and describing developments as “going along swimmingly.”
That echoed his earlier comments this week that the fighting was “very close to over” and that Tehran wanted to “make a deal very badly.”
Araghchi’s post on X made it official: “In line with the ceasefire in Lebanon, the passage for all commercial vessels through Strait of Hormuz is declared completely open for the remaining period of ceasefire, on the coordinated route as already announced by Ports and Maritime Organization of the Islamic Rep. of Iran.”
Oil prices reacted violently to the news. U.S. crude for May delivery plunged 9.8 percent to $85.37 a barrel. Brent for June fell 9.1 percent to $90.38. The drop was the clearest sign yet that investors had been pricing in the risk of a sustained blockade in the narrow waterway that normally carries roughly one-fifth of the world’s oil and natural gas.
With that threat lifted, at least temporarily, the market’s focus shifted back toward lower input costs across the economy.
The implications stretch well beyond energy. Airlines, trucking companies, chemical makers, and consumer-goods producers all stand to benefit from cheaper fuel. So do households, where lower gasoline prices could quickly translate into more disposable income. On the policy front, the Federal Reserve now has a little more breathing room; persistent high energy costs had been complicating the inflation picture and keeping rate-cut expectations in check. A sustained drop in oil could help tilt the balance toward easier monetary policy later this year.
The rally also highlights how quickly sentiment can flip in a geopolitically charged market. For weeks, the Middle East flare-up had kept a lid on risk appetite, pushing investors toward defensive sectors and safe-haven assets. Friday’s news flipped the script. Money flowed back into cyclicals, small-caps, and growth names that had lagged during the uncertainty. The fact that the Russell 2000 led the charge is telling: smaller companies tend to suffer most when energy prices spike and global trade routes seize up, so their outsized rebound shows just how much relief is now priced in.
Still, traders are under no illusion that the situation is resolved. The ceasefire is temporary, and the Hormuz opening is explicitly tied to its duration. Any spark, whether a breakdown in Lebanon talks or a new escalation involving Iran, could send oil and volatility right back up. Markets have seen these hopeful moments before, only for them to unravel.
For now, though, the dominant mood is one of cautious optimism. Investors are betting that diplomacy has momentum and that the worst of the supply shock is behind them.
The week’s gains leave the major indexes comfortably in positive territory and close to recent highs. After a period of whipsaw trading driven by Middle East headlines, Friday’s session felt like a release valve. For one day at least, Wall Street could celebrate the simple fact that one of the world’s most critical energy arteries is open again—and the economic clouds that had been gathering are starting to part.