Stock Market Updates: S&P 500, Nasdaq, Dow Futures Slide as Trump Rejects Iranian Peace Proposal

Moderna just had one of its biggest weeks in years. And a deadly cruise ship outbreak lit the fuse.

The trigger was a hantavirus outbreak aboard the Dutch cruise ship MV Hondius. The World Health Organization confirmed seven cases and three deaths linked to the Andes virus strain, known for its limited human-to-human transmission. That was enough to send biotech traders into overdrive.

On May 8, Moderna confirmed to the media that the company has partnered with the U.S. Army Medical Research Institute of Infectious Diseases to conduct early-stage research on a hantavirus vaccine, and crucially, noted that the work began before the cruise ship outbreak. That confirmation changed everything for the stock.

Shares surged approximately 14% in Friday afternoon trading alone. Including recent gains, Moderna stock is now up nearly 80% versus the start of this year. That is a remarkable run for a company still recovering from its post-COVID revenue collapse.

Moderna's Phase 1 study of its investigational hantavirus vaccine candidate showed it was well-tolerated, with no serious safety signals and strong antibody responses across all dose levels. Hantavirus causes severe Hantavirus Pulmonary Syndrome with a fatality rate exceeding 30%, representing a significant unmet medical need.

But analysts are pumping the brakes hard. Experts say a hantavirus vaccine is likely a decade away without a "Warp Speed" level of government funding. The consensus rating on Moderna sits at "Hold" only, with the mean price target of nearly $47, implying potential downside of over 11% from current levels.

Insider activity raises its own red flag, insiders sold $8.8 million worth of shares in the last three months alone. That is not typically the behavior of people expecting a sustained rally.

Public health officials from the CDC have stressed that the overall risk to the American public remains very low and that the outbreak will not evolve into a pandemic. Six exposed passengers returned to U.S. soil. States are monitoring. But no widespread spread has occurred.

Analysts concluded that the hantavirus-driven rally in vaccine stocks is likely event-driven, not a long-term trend. Moderna caught a genuine headline. Whether the stock can hold these levels without hard commercial data is the real question now.

Two major forces are colliding this week. Trump is flying to China. And America's inflation data is about to land. Both carry enormous market weight.

President Trump is scheduled to meet Chinese President Xi Jinping in Beijing in May 2026, his first visit to China in eight years. The summit arrives amid one of the most turbulent periods in modern U.S.-China trade relations. The stakes are almost impossible to overstate.

The rocky road to this point included Liberation Day tariffs in April 2025, both countries raising levies beyond 100%, China restricting rare earth exports, a 90-day Geneva truce that quickly unraveled, and a sixth round of talks in Paris described by both sides as "constructive." That is a lot of damage to repair in one Beijing summit.

The most substantive policy outcome being floated is a move toward a so-called "Board of Trade", a managed trade framework that would identify roughly $30 billion worth of U.S. products China would import, matched by an equivalent value of Chinese goods entering the United States. Think of it as structured trade, not free trade. A significant philosophical shift.

Under a recent deal framework, the U.S. agreed to scale back tariffs while China committed to targeting illicit fentanyl trafficking, resuming American soybean purchases, and pausing rare earth export curbs. Small wins. But real ones.

Now inflation enters the room. April's CPI report drops Tuesday morning, and economists expect headline inflation to jump from 3.3% in March to 3.8%, driven primarily by the oil shock. Core CPI, which strips out food and energy, is expected to tick up to 2.7% from 2.6%. That is moving in the wrong direction.

March CPI already surged 0.9% month-over-month, the largest single-month increase since June 2022, driven by a 21.2% jump in gasoline prices tied directly to the Iran conflict. April is expected to pile on further.

Wells Fargo warned that rising energy prices are now feeding into transportation costs, and that will start showing up in food prices. Shelter costs are also expected to spike due to data distortions from last year's government shutdown.

Trump's tariffs now amount to the largest U.S. tax increase as a share of GDP since 1993, hitting an average of $1,500 per household in 2026. That burden is landing on consumers already squeezed by $4-plus gasoline. Trump heads east looking for a deal. The CPI arrives Tuesday with the tab.

Nintendo walked into Monday morning carrying bad news. And markets felt it immediately.

Nintendo shares fell 5.54% in Tokyo as investors digested the game developer's announcement that it will raise Switch 2 prices even as it expects a decline in console sales. The combination was brutal. Higher prices. Lower volumes. That is not a recipe investors celebrate.

The numbers behind the warning are stark. Nintendo forecasts fiscal 2027 net sales of 2.05 trillion yen, down 11.4% year over year. Net profit is expected to decline 26.9% to 310.0 billion yen. Switch 2 hardware sales are projected at 16.50 million units, a 16.9% drop from the current year. The company also announced a dividend cut to 162 yen from 219 yen. That dividend cut particularly stings long-term holders.

What is driving all of this? Nintendo attributed the softer outlook to higher memory and materials costs, tariffs, and elevated shipping expenses tied to the Iran conflict, estimating those pressures would create a 100 billion yen hit to its business. The Iran war is now reaching into video game pricing. That is how far the disruption runs.

In Japan, the Switch 2 price will rise to 59,980 yen from 49,980 yen starting May 25. In the U.S., prices climb to $499.99 from $449.99 beginning September 1. European pricing moves to 499.99 euros from 469.99 euros on the same date. Global price hikes across every major market at once.

Nintendo is currently trading at 6,980 yen, down sharply from its previous close of 7,667 yen, hitting a 52-week low of 6,895 yen intraday. The stock has now shed nearly 40% over the past year.

On Wall Street, the mood was equally cautious. S&P 500 futures and Nasdaq 100 futures were both marginally lower. Dow futures slid 81 points, or 0.16%. The pullback follows a strong week; the S&P 500 and Nasdaq rallied more than 2% and 4%, respectively, last week, with both indexes recording their sixth straight winning weeks, a first for each since 2024.

Oil is back in focus, too. West Texas Intermediate futures jumped 3.94% to $99.18 per barrel, and Brent crude rose 3.49% to $104.83, after President Trump rejected Iran's latest peace proposal over the weekend. No deal. More pressure. The Strait of Hormuz stays closed, and energy markets are pricing that reality in fast.

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Oil markets surged after reports that Donald Trump rejected an Iranian peace proposal amid escalating Middle East tensions. Brent crude briefly approached $100 per barrel, while West Texas Intermediate rose above $96, driven by fears of supply disruptions near the Strait of Hormuz, a key route for nearly 20% of global oil shipments. Traders are also reacting to existing OPEC+ production cuts and potential sanctions on Iran, which could further tighten supply. Analysts warn Brent may test $100 if instability persists. Rising oil prices are lifting energy stocks but pressuring airlines and transport sectors, while also raising global inflation concerns and delaying potential interest rate cuts. Investors are closely watching geopolitical developments, OPEC decisions, and US crude inventory data for direction.

Oil jumped, futures slipped, and markets opened the week in defensive mode after Donald Trump reportedly dismissed Iran’s latest peace proposal as “totally unacceptable,” reviving fears of a prolonged Middle East conflict and renewed inflation pressure on the global economy.

According to reports from Yahoo Finance and The Edge Markets, Dow futures fell nearly 280 points in early trading. In contrast, S&P 500 futures slipped around 0.6%, and Nasdaq futures declined close to 0.7% as investors reacted to the sharp rise in crude prices. Brent crude surged above $108 per barrel, while WTI crude moved toward the $104 mark amid fears of supply disruption through key oil transit routes.

The market reaction was immediate because energy prices are once again threatening the Federal Reserve’s inflation path. Traders now fear that another sustained oil rally could delay potential rate cuts that equity markets had been pricing in for the second half of 2026.

Technology and consumer discretionary stocks led premarket losses, with chipmakers and airline shares seeing early pressure. Airlines remain particularly exposed as higher fuel costs directly impact operating margins. Treasury yields also moved higher, signaling that bond markets are reassessing inflation expectations after weeks of relative calm.

Investors are now watching whether geopolitical tensions spill into broader regional instability. Analysts cited in the reports noted that, even though recent US economic data have remained resilient, markets are becoming increasingly headline-sensitive as election politics, energy markets, and Federal Reserve policy begin to intersect simultaneously.

The latest updates also suggest traders may remain cautious through the week unless diplomatic signals improve or oil prices stabilize.