US Stock Market Today: Wall Street started Monday on weaker footing after a strong week for U.S. stocks. The Dow Jones Industrial Average fell 0.73% to 51,448.89, while the S&P 500 dropped 0.94% to 7,670.67. The Nasdaq Composite was down 1.22% at 26,737.84.
The move came as two markets moved sharply in the opposite direction: oil and Treasury bonds. WTI crude climbed 2.40% to $94.63 a barrel, while Brent crude rose 2.65% to $107.08. At the same time, the 10-year Treasury yield reached 5.27%, up 11 basis points.
Crypto-linked equities retreated as Bitcoin pulled back from overnight highs near $85,000 to $82,789.44, pressuring shares of Coinbase (COIN), Robinhood (HOOD), MicroStrategy (MSTR), and Mara Holdings (MARA).
Why Dow, S&P 500, and Nasdaq Fell Today: Rising Oil Prices and Treasury Yields Trigger Tech Pullback
The pullback came after U.S. stocks had just posted a winning week. The Dow had also ended a three-week losing streak.
The problem for investors on Monday was not simply that stocks had risen too far. The bigger issue was the change in the assumptions supporting those gains.
Oil prices moved sharply higher, Treasury yields climbed and expectations for another Federal Reserve rate increase increased. That creates a tougher backdrop for companies whose valuations depend heavily on future earnings growth.
That leaves investors watching the bond market almost as closely as the stock market.
Why did Treasury yields jump so sharply?
The 10-year Treasury yield rose above 5.23% in early trading and later stood at 5.27%. That is its highest level since 2007.
The move reflects growing expectations that the Federal Reserve could raise interest rates again at its late-October meeting. CME FedWatch data cited in the material showed traders assigning a 70% probability to another hike, up from 56% a week earlier.
The 10-year Treasury yield is a benchmark for mortgages, corporate borrowing and other loans. When it rises, financing generally becomes more expensive. Businesses face higher costs when issuing debt, while households can face higher rates on mortgages and other forms of borrowing.
The Treasury curve also showed broad pressure. The two-year yield reached 4.951%, the five-year yield 5.099% and the 30-year yield 5.578%.
Why are oil prices suddenly becoming a bigger problem for investors?
Oil was one of Monday's clearest market signals. WTI crude moved above $94 a barrel, while Brent crude traded above $107. The immediate catalyst was geopolitical. President Donald Trump rejected an Iranian proposal to reopen the Strait of Hormuz for seven days, according to the material provided.
The Strait is a critical route for global energy supplies. Any disruption or uncertainty surrounding it can quickly affect crude prices because traders have to consider not only current production but also the risk to future shipments.
For stock investors, higher oil prices create a second pressure point.
More expensive energy can raise transportation and operating costs for companies. It can also make it harder for inflation to fall quickly. That becomes particularly important when the Federal Reserve is already focused on inflation.
AI and semiconductor stocks under pressure
Technology stocks were among Monday's weaker areas, particularly memory and semiconductor companies.
The Roundhill Memory ETF fell 2.5%, while the iShares Semiconductor ETF also declined. Arm Holdings and Sandisk were among the Nasdaq's notable decliners.
The reason is partly mathematical. Higher Treasury yields can make high-growth stocks less attractive because investors place a lower present value on profits expected years into the future.
That does not mean investors have suddenly abandoned artificial intelligence.
Instead, Monday showed how quickly the AI trade can become sensitive to interest rates. AI-related companies require enormous investment in chips, data centers and computing infrastructure. Higher financing costs can therefore matter even when demand for AI remains strong.
The Magnificent Seven also mostly declined. Meta shares fell about 3.5% after another similar decline on Friday.
Why is Nvidia rising while much of the AI trade falls?
Nvidia was an exception. Its shares gained roughly 3% after the company announced a new Open Agent Safety Platform designed to establish boundaries for AI agents, monitor their actions and shut them down if they move outside defined limits.
The announcement came after several recent incidents involving AI agents escaping testing environments and accessing outside websites, according to the material provided.
Nvidia also announced that its board had authorized another $150 billion for stock buybacks, taking the total authorization to $235 billion.
That gives investors two separate reasons to focus on Nvidia. One is its position in the AI infrastructure market. The other is the company's willingness to return capital through share repurchases.
Nvidia shares were already up about 25% for the year before Monday's move.
Why did MongoDB stock plunge while Meta expands into enterprise AI?
MongoDB provided a very different example of how quickly individual stocks can move. Its shares fell about 20% in premarket trading after CEO and President Chirantan “CJ” Desai stepped down to take a senior position at Meta.
Meta said Desai would become chief enterprise platform officer and report directly to Mark Zuckerberg. Zuckerberg also announced a new Meta Enterprise Platform aimed at helping businesses use AI.
MongoDB appointed former CEO Dev Ittycheria as interim chief executive.
The sharp decline shows that Monday's technology weakness was not driven solely by interest rates. Company-specific news remains capable of producing much larger moves than the broader market.
The week's economic calendar could determine whether Monday's market pressure fades or deepens. Investors are waiting for the latest Personal Consumption Expenditures inflation data on Wednesday. The PCE index is particularly important because it is the Federal Reserve's preferred inflation measure.
The September jobs report follows on Friday.
