A 4.48 percent weekly decline hit the Nasdaq Composite after inflation readings came in above forecasts, pushing Treasury yields upward and prompting investors to reconsider whether artificial-intelligence companies carrying heavy debt loads can produce returns that justify the scale of capital they have deployed. On Friday, the technology-weighted index shed 2.14 percent of its value, with companies tied to AI infrastructure recording some of the steepest declines.
Shares of CoreWeave shed 13.65 percent in Friday's session and 25.21 percent across the full trading week, while Nebius Group posted a 12.18 percent drop on the same day and a 25.15 percent retreat over the five-day period. Palantir Technologies stock lost roughly 7.22 percent of its value by the end of Friday's trading session, a movement that unfolded despite the company posting financial results that held firm.
The sell-off pointed to wider market stress: AI-related companies had attracted considerable capital on the strength of rapid-growth projections, yet a combination of elevated borrowing costs and unresolved questions about the profitability of AI infrastructure spending has begun to weigh on that investment rationale. Fresh inflation data added weight to expectations that borrowing costs may stay at elevated levels for an extended stretch, a prospect that weighs on tech firms whose stock valuations hinge on projected future earnings and whose growth ambitions demand access to substantial outside capital.
The Dow Jones Industrial Average, by contrast, posted a 0.67 percent weekly advance, with Friday's session wrapping up at 52,000. Broad-market equities tracked by the S&P 500 gave back 1.95 percent, settling at 7,659, while smaller companies grouped under the Russell 2000 index absorbed a steeper retreat of 3.05 percent. Heading into the weekend, traders left both the S&P 500 and the Nasdaq sitting close to where each index had struggled most across the five-day stretch.
Wednesday's session saw the 10-year Treasury yield push past the 5.30 percent mark before pulling back toward the 5.20 percent range. Demand for government bonds picked up on Thursday, pulling the 10-year yield down by nearly 13 basis points to 5.05 percent, as uncertainty surrounding the financial health of AI infrastructure companies drew investors toward the asset class. Yields on the 30-year Treasury note dipped as well, settling at 5.43 percent.
Volatility in bond yields laid bare how tightly stock valuations are now tethered to the market's read on inflation and the prevailing cost of borrowing. When bond yields climb, the discounted worth of companies' anticipated profits shrinks while the expense of funding large-scale infrastructure and industrial ventures grows.
Regan Capital's Dallas-based chief investment officer, Skyler Weinand, described the most recent Consumer Price Index data as reinforcing his position that price pressures had not eased, adding in remarks to a news outlet that the uptick in inflation pointed toward the Federal Reserve embarking on a cycle of rate increases. His forecast calls for the central bank to hold rates steady in October, then resume tightening from December onward through June 2027.
Life360's newly appointed lead economist, Elizabeth Renter, attributed September's uptick in consumer prices primarily to energy costs — a pressure felt at the petrol pump and passed along through airfare as airlines absorbed steeper jet-fuel bills — and noted that while pump prices had eased somewhat over July and August, that relief proved brief, with the latest inflation data pointing toward a greater probability of another rate increase by the Federal Reserve.
Montis Financial's chief investment officer, Dennis Follmer, put forward the view that a 10-year Treasury yield holding above the 5 percent threshold may reflect a lasting structural shift rather than a passing deviation from prior norms. The Waltham, Massachusetts-based firm oversees $1.4 billion in assets, and Follmer told a prominent broadcast outlet that for an extended period the Treasury benefited from large rate-insensitive purchasers — among them China, Japan, and the Federal Reserve — yet with those buyers no longer active in that role, government debt instruments now face pressure to deliver returns that can compete in the open market, a challenge compounded by an expanding supply of new issuances tied to elevated federal expenditure, which Follmer argued gives bondholders grounds to demand higher yields.
Firms supplying the foundational technology that underpins the sector's growth absorbed a disproportionate share of that selling pressure. Shares in CoreWeave, a US-based cloud infrastructure provider, retreated as investors weighed whether the heavy capital demands of AI-driven operations could generate adequate returns. GuruFocus data place CoreWeave's return on invested capital at negative 0.45 percent, a figure that falls well short of the firm's estimated weighted average cost of capital, put at 8.97 percent by the same source.
Nebius Group — a company whose business model centres on building end-to-end infrastructure for the AI sector worldwide and whose financial profile mirrors that of comparable peers — recorded losses of its own during the period. Oracle's share price retreated 8.33 percent on Wednesday, a move analysts tied to broader investor questions about whether the capital requirements of artificial intelligence infrastructure can be met by large technology firms operating under persistently high interest rates. Shares in CoreWeave fell by 15.46 percent across that trading session.
Clark Bellin, president and chief investment officer at Bellwether Wealth in Lincoln, Nebraska, described the current reporting period as carrying particular weight for markets, noting that corporate profit growth has underpinned a large portion of this year's equity gains and that investors are watching closely to see whether that earnings trajectory holds.
Revenue and profit targets set by analysts were cleared by Goldman Sachs and Citigroup on both counts, whereas JPMorgan fell short across those same two measures. Quarterly figures from Wells Fargo cleared the bar analysts had set for profit, though the bank's top-line revenue landed below what those same forecasts had anticipated. A 5.60 percent drop in Citigroup stock on Tuesday dragged the Invesco KBW Bank ETF lower by 1.39 percent.
Banking and credit card earnings disclosures, according to Brett Kenwell — an investment strategist at eToro — carry the potential to illuminate how households are faring financially at a point when wage growth has struggled to keep pace with rising prices. Shares of Johnson & Johnson dropped 5.73 percent on Tuesday, a decline that came even as the company posted strong quarterly earnings, with pharmaceutical names in the defensive sector lending some support to the Dow amid a broader pullback in technology stocks.
Trading on Wednesday saw the Nasdaq give back 1.88 percent and the Russell 2000 shed 1.93 percent, with the broader S&P 500 posting a more modest loss of 1.11 percent. Trading on the blue-chip index ended with narrow advances, as money flowed out of growth-oriented holdings and into healthcare names such as Johnson & Johnson and Merck.
Overnight, South Korea's Kospi index shed 7.57 percent, dragging semiconductor shares into the red at the open — though bargain-hunting activity trimmed a portion of those early losses as the session wore on. Gains in three technology-sector names — Salesforce at 4.57 percent, ServiceNow at 6.4 percent, and Microsoft at 1.08 percent — were enough to nudge the Nasdaq into positive territory by the closing bell. Broader gains landed with the Russell 2000, which climbed 1.24 percent, while the Dow posted a 1.08 percent advance and the S&P 500 edged up by 0.33 percent.
Trading Economics data showed Brent crude climbing past the $106-per-barrel threshold on Monday, 12 October, a gain of over one percent that pushed the benchmark to its strongest position in more than a fortnight. Shares of Applied Materials retreated 6.69 percent on the session, with Lam Research and KLA each giving back roughly 4 percent, a combined drag that pulled the Philadelphia Semiconductor Index 1 percent lower.
Follmer expressed continued confidence in equities heading into the fourth quarter, pointing to what he described as a re-gathering economic momentum and the likelihood of a third straight quarter in which profit growth outpaces already-high analyst forecasts, while adding that a year-end advance in stock prices would be hard to rule out absent an unforeseen slowdown in earnings.
