Oil jumped nearly 7% and shipping through the Strait of Hormuz was restricted after the US fired on and seized an Iranian‑flagged cargo vessel, forcing traders to price a middle ground between full-scale war and stable peace. The S&P 500 fell 0.24% to 7,109.14 and the Nasdaq slipped 0.26% to 24,404.39 — snapping a 13-day winning run — while West Texas Intermediate rose to $89.61 a barrel and Brent to $95.48.

Market moves and the immediate shock

Stocks retreated on Monday as investors digested weekend events in the Gulf. The S&P 500 closed down 0.24% at 7,109.14 and the Nasdaq Composite fell 0.26% to 24,404.39, snapping its 13-session winning streak — the longest such run since 1992. The Dow Jones Industrial Average slipped 4.87 points to 49,442.56.

Two pieces of data stood out: small caps extended their rally, with the Russell 2000 gaining 0.58% to a new closing record at 2,792.96, and software names outperformed, with the iShares Expanded Tech-Software ETF rising more than 1% during the session.

Energy markets reacted more violently than equities. West Texas Intermediate crude climbed 6.87% to $89.61 a barrel, and Brent rose 5.64% to $95.48 after reports that the U.S. had fired on and taken custody of an Iranian‑flagged cargo vessel in the Gulf of Oman. The brief reopening of the Strait of Hormuz late last week had given markets hope, only for that optimism to evaporate when shipping was restricted again.

Why investors say they're recalibrating

Traders and strategists describe a market that has shifted from panic to tentative accommodation. David Wagner, head of equities and portfolio manager at Aptus Capital Advisors, said the conflict is now "in the rearview mirror for the market," and pointed to corporate earnings as giving equities some protection from geopolitical shocks.

Mastheads

Still, other voices warned against complacency. Matt Gertken, chief geopolitical strategist at BCA Research, said markets are running on the assumption that political leaders can dial tensions up and down at will. He added that Iran's response has been different now that it has been directly attacked, and that Tehran may tolerate more pain than markets expect.

From airstrikes to ceasefire and back

The current phase follows a fast-moving sequence of events that has tested investor nerves. U.S. airstrikes on Iranian targets began at the end of February, prompting an immediate market selloff that took the S&P roughly 8% lower through March 30. Since that low, the market staged a strong rebound — the S&P has climbed more than 12% from the late‑March trough, and international equities have recovered much of their losses.

A two‑week ceasefire between Washington and Tehran was agreed on April 7 and briefly eased pressure on oil flows when Iran said the Strait of Hormuz was reopened. Those gains were fragile. By the weekend vessel traffic through the strait was once again restricted, with Iranian state media saying U.S. forces had not met their obligations. The ceasefire is due to expire this week, adding another time point for traders to watch.

How the new normal shapes portfolios

Investors are reacting in different ways. Some treat the environment as a temporary shock to be ridden out; others hedge or trim exposure. Typical moves include:

  • Leaning into equities on the view that corporate profits and valuations still support higher prices.
  • Trimming exposure to geopolitically sensitive sectors such as transport and tourism.
  • Buying energy-related assets as a hedge against higher oil prices.
  • Increasing allocations to defence contractors or related plays as a geopolitical hedge.

Wagner argued the earnings outlook for the S&P 500 gives markets insulation and room to climb, pointing to valuation expansion and profit growth as possible drivers.

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The two‑week ceasefire is due to expire this week, a concrete near‑term milestone markets can price into portfolios as investors decide whether to treat this as another temporary shock or a persistent new norm.

This article was created with AI assistance.