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Stock Market Today, Oct 15: Hot CPI, Chip Rout
StockCram Editorial4 min readHotter-than-expected September CPI and a global chip selloff gave Wall Street its worst day since July, while 10-year Treasury yields jumped to 5.30%.
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- •US stocks had their worst day since July on Wednesday, October 14, as a hotter-than-expected inflation report and a tech selloff pushed the S&P 500 down 1.11% to 7,718.94 and the Nasdaq down 1.88% to 26,692.87, while the Dow slipped just 0.09% to 51,621.48.
- •September consumer prices rose 3.7% from a year earlier, above the 3.6% forecast, and traders raised the odds of an October Fed rate hike to 46% from about 20%.
- •South Korea's Kospi fell 7.57% to 5,554.22 on Thursday as Samsung Electronics and SK Hynix dropped about 10% each, which spread the chip rout across Asia and Europe.
- •The 10-year Treasury yield jumped to 5.30% after the inflation report before easing, and the Fed's next decision on October 28 follows its September hike to a 3.75%–4.00% range.
Deep DiveToday's Market Movers
September inflation runs hotter than expected, raising bets on more Fed rate hikes
What Happened
The Bureau of Labor Statistics said the September Consumer Price Index (CPI) rose 0.6% from August and 3.7% from a year earlier, above the 3.6% yearly rate economists expected and up from 3.4% in August. Core CPI, which leaves out food and energy, rose 0.3% on the month and 2.6% on the year, against forecasts of 0.2% and 2.5%. Gasoline jumped 9.1% in September and made up over half of the monthly increase.
Why It Matters
Higher inflation gives the Fed more reason to keep raising rates, and that makes borrowing costlier for companies and households. Traders put the odds of an October hike at 46%, up from about 20% before the report. For background on how the Fed weighs monthly data against annual figures, read why the Fed might raise rates in 2026, or see our explainers on CPI and core inflation.
Market Impact
Equities
S&P 500 fell 1.11% to 7,718.94; Russell 2000 fell 1.93% to 2,729.53
Rates
10-year Treasury yield jumped about 9 basis points to 5.30% right after the report, then pulled back
FX
US dollar rose after the report, then gave back those gains by Thursday as yields eased
Commodities
Gasoline drove the price jump; Brent crude was near $108.70 a barrel Wednesday morning
Chip stocks lead a global tech rout; Nasdaq sinks 1.9% and Korea's Kospi plunges 7.6%
What Happened
South Korea's Kospi index closed down 7.57% at 5,554.22 on Thursday after Samsung Electronics and SK Hynix fell roughly 10% each, which triggered a market-wide trading halt. The selloff followed a Wednesday in the US when the Nasdaq Composite lost 1.88% and information technology was the weakest S&P 500 sector at -3.00%. Bloomberg reported MSCI's Asia Pacific index slid 2.7%, its lowest level since July.
Why It Matters
Chip and AI stocks have driven much of this year's market gains, so sharp drops there pull whole indexes down. Rising borrowing costs make the huge spending on AI data centers look more expensive, which feeds the debate in are we in another AI bubble?
Market Impact
Equities
Nasdaq Composite fell 1.88% to 26,692.87; tech was the worst S&P 500 sector, down 3.00%; Kospi closed down 7.57% at 5,554.22
Rates
Treasuries rallied on Thursday as investors sought safer assets
FX
Dollar weaker on Thursday as investors moved into bonds
Commodities
No clear direction tied to the chip selloff
CoreWeave drops about 15% as AI debt worries grow
What Happened
CoreWeave, an AI data-center company backed by Nvidia, fell 15.46% on Wednesday as its bond yields climbed. Nebius Group fell 10.08% and Nvidia fell 3.16% in the same session. Investors worried about how companies will pay for costly AI buildouts when Treasury yields are above 5%.
Why It Matters
Firms that borrow heavily to expand are the most exposed when interest rates rise. Their stock and bond moves are an early sign of how much stress higher rates are putting on the AI boom.
Market Impact
Equities
CoreWeave fell 15.46%, the weakest Nasdaq 100 stock; Nvidia fell 3.16%
Rates
Higher yields on CoreWeave's bonds signaled investors want more pay to lend to it
FX
No notable move
Commodities
No notable move
Treasury yields stay near multi-year highs as traders price in more hikes
What Happened
The 10-year Treasury yield rose 9 basis points to 5.304% after the CPI report, then fell back as stocks sold off and investors moved into bonds. The 2-year yield, which tracks Fed policy closely, rose to about 4.808% at one point, its highest since September 29. The Fed raised its rate to a 3.75%–4.00% range in September, its first hike since 2023.
Why It Matters
Yields set the cost of mortgages, car loans and business debt. When they rise, stocks that promise profits far in the future usually look less valuable. See our guides to bond yield and basis points.
Market Impact
Equities
Higher yields weighed most on small caps and growth stocks
Rates
10-year yield touched 5.30% Wednesday, then eased to about 5.1% by Thursday; 2-year near 4.81%
FX
Dollar gave back its post-CPI gains on Thursday as yields slid
Commodities
Little direct effect
Oil stays above $100 as the Iran war keeps energy prices high
What Happened
Brent crude traded near $108.70 a barrel on Wednesday morning, up 1.31% from a day earlier and about 74% above its level a year ago. TheStreet linked the hot CPI report to the effects of the months-long Iran war. Gasoline's 9.1% jump in September made up over half of the monthly rise in consumer prices.
Why It Matters
Energy prices touch almost every cost in the economy, so they keep inflation high and make the Fed's job harder. For more on how the conflict affects supply, see oil prices during war and the Strait of Hormuz.
Market Impact
Equities
Energy costs add to pressure on consumer and industrial shares; industrials fell 0.96%
Rates
Energy costs feed inflation and support bets on higher rates
FX
No clear effect
Commodities
Brent was about $108.70 a barrel Wednesday morning, up $1.41 from a day earlier and about $46 above a year ago
Historical Perspective
Similar Event
In 2022, when the Fed was raising rates to fight high inflation, a hotter-than-expected CPI report on September 13, 2022 hit stocks hard.
What Happened Then
The S&P 500 fell about 4.3% that day, its worst single day since 2020, as investors expected more rate hikes. Growth and tech stocks fell the most, which is a pattern similar to Wednesday's selloff. Learn more with our guide on what the stock market is.
What to Watch Next
- →October 15, 8:30 a.m. ET: Producer Price Index for September, a measure of wholesale prices (prior: +0.4% for August; forecasts near +0.5% to +0.6%)
- →October 15, 8:30 a.m. ET: US retail sales for September (prior: about +1.1% to +1.2% for August; forecast +0.3%)
- →October 15, 8:30 a.m. ET: Weekly initial jobless claims (prior: 197,000; forecasts of 195,000 to 200,000)
- →October 28: Federal Reserve interest rate decision (prior: 25-basis-point hike to 3.75%–4.00% on September 16)
Analysis Confidence
Conviction Level:★★★★★
Key Uncertainties
Reports differ on the exact closing level of the 10-year yield and on the price of oil. The Thursday data on producer prices, retail sales and jobless claims had not been seen when this was written. The chip selloff is moving fast, so figures can change quickly.
Sources
- • CNBC (2026-10-14)
- • The Washington Post (AP market data) (2026-10-14)
- • TheStreet (2026-10-14)
- • Bloomberg (2026-10-15)
- • The Korea Herald (2026-10-15)
- • Charles Schwab (2026-10-14)
- • Quartz (2026-10-14)
- • Yahoo Finance (2026-10-14)
- • Fortune (2026-10-14)
- • FXStreet (2026-10-15)
- • Kiplinger (2026-10-14)