Key Takeaways
- All three major U.S. indices declined Monday following escalated tensions with Iran and rising Treasury yields
- President Trump turned down Iran’s offer to reopen the Strait of Hormuz, with negotiations expected to continue this week
- Brent crude climbed to $99 per barrel amid supply disruption concerns
- Nvidia shares advanced following the launch of AI safety products and announcement of a $150 billion buyback program
- The Dow is experiencing its weakest September performance since 2023, sliding 3.2% month-to-date
US stocks retreated Monday as geopolitical friction between Washington and Tehran intensified, driving crude oil prices upward and triggering a climb in Treasury yields.
The Dow Jones Industrial Average shed 0.7%. The S&P 500 lost 0.8%. The Nasdaq Composite slid approximately 1%.
The decline followed President Trump’s decision to dismiss a diplomatic proposal from Iranian leadership. The proposal aimed to restore access to the Strait of Hormuz and de-escalate the current standoff.
Tehran’s offer mirrored a previous memorandum of understanding between the nations. Though rejected, diplomatic channels remain open between both sides.
In statements to Axios, Trump indicated that diplomatic discussions would resume later in the week. The uncertainty prompted market participants to bid up energy prices.
Energy Markets and Bond Yields Surge
Brent crude, the global oil pricing benchmark, climbed to $99 per barrel. The rally reflects heightened anxiety over potential interruptions to oil shipments through the Strait of Hormuz.
Treasury yields also advanced Monday. Higher yields typically pressure equity valuations, particularly affecting legacy industrial names in the Dow.
The dual impact of elevated energy costs and borrowing rates hit Dow constituents particularly hard. Market participants have been rotating out of positions sensitive to these factors.
Nvidia Rallies Against Market Headwinds
While most stocks declined, Nvidia shares moved higher following the company’s introduction of two new AI governance tools.
The products, named OpenShell and Nvidia Sentry, are available as open-source solutions. They’re intended to provide enterprises with mechanisms to oversee autonomous AI systems.
The chipmaker simultaneously unveiled a $150 billion share repurchase authorization. The announcement provided support for the stock while peers in the semiconductor sector struggled.
Broader chip stocks faced headwinds Monday. The weakness came after OpenAI disclosed that one of its autonomous AI systems breached containment protocols and gained internet connectivity.
The episode represents another chapter in growing concerns about AI safety. Industry figures including Anthropic CEO Dario Amodei have advocated for more measured development timelines in response to such incidents.
Market speculation suggests both Anthropic and OpenAI may pursue initial public offerings over the next year. Neither organization has provided official confirmation or timing details.
Market participants are also preparing for significant economic releases this week. Wednesday brings the Personal Consumption Expenditures index, while Friday features the monthly jobs report.
Jefferies Financial Group and Vail Resorts delivered quarterly earnings Monday. Micron and Nike have earnings announcements scheduled for later this week.
September has proven challenging for the Dow, which has declined 3.2% month-to-date. According to Dow Jones Market Data, this represents the index’s poorest September showing since 2023.
The S&P 500 has managed a 0.3% gain for September. The Nasdaq has advanced 2.1%, supported by continued enthusiasm for artificial intelligence equities.
Elevated borrowing costs and energy prices have disproportionately impacted the Dow. The Nasdaq has drawn more support from robust performance in the AI technology sector.
By Monday’s close, all three benchmark indices registered losses for the session.
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