Nasdaq Sinks 4.5% as AI Financing Fears Trigger Tech Selloff; Dow Gains 0.7% on Defensive Rotation

Mumbai, 17 Oct: Wall Street closed a volatile week sharply divided on Friday, with the Nasdaq Composite and S&P 500 posting their worst weekly performances since June as mounting doubts over the sustainability of the artificial intelligence investment boom triggered a violent rotation out of technology stocks and into defensive sectors. The blue-chip Dow Jones Industrial Average bucked the trend entirely, finishing the week higher as investors fled growth-oriented names for consumer staples, healthcare and financials.

The week’s defining catalyst was a sharp reassessment of AI-related financing conditions, which sent semiconductor shares tumbling for eight consecutive sessions and drove a rush into US Treasurys despite two hotter-than-expected inflation readings. The S&P 500 fell 1.95% for the week to 7,659.44, while the Nasdaq Composite plunged 4.5% to 26,140.03.

The Dow Jones Industrial Average gained 347.46 points, or 0.7%, to close at 52,002.41. The Russell 2000 tumbled 3% to 2,721.37, sinking below its 200-day moving average. The market’s move was highly concentrated: technology and semiconductor stocks bore the brunt of selling pressure, while eight of eleven S&P 500 sectors posted gains for the week.

Middle East Tensions Lift Oil, but Tech Stocks Stumble

The trading week opened on Monday 12 October with cautious sentiment as escalating tensions in the Middle East, including strikes by Yemen’s Houthis against Saudi Arabia and attacks on two oil tankers over the weekend, fuelled safe-haven demand for the US Dollar and pushed crude oil prices higher. The Dow Jones Industrial Average slipped modestly, while the Nasdaq Composite edged lower as semiconductor memory stocks came under early selling pressure. The S&P 500 held relatively steady, buoyed by energy sector strength.

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The 10-year Treasury yield was little changed as US bond markets remained closed in observance of Columbus Day. The session’s tone was mixed: energy stocks advanced on geopolitical risk premiums, while technology and communication services lagged. The US Dollar Index touched an 18-month high near 103.00 before retreating, as investors sought safe-haven assets amid the Middle East escalation.

Fed Officials Signal October Pause, Yields Retreat

Bond markets reopened on Tuesday 13 October, and a notable shift in Federal Reserve communication set the tone for the session. New York Fed President John Williams said he continues to support one additional interest-rate increase in 2026 but does not anticipate further hikes in 2027, remarks that market participants interpreted as signalling a pause at the October 28 policy meeting. Federal Reserve Governor Christopher Waller separately said the recent rise in US bond yields reflects stronger economic growth rather than higher inflation expectations, which remain “well anchored”.

The dovish undertones triggered a broad decline in Treasury yields. The 10-year Treasury yield fell 3.16 basis points to 5.213%, the 2-year yield declined 1.27 basis points to 4.791%, and the 30-year yield dropped 3.42 basis points to 5.561%. Equities responded positively, with the Dow Jones Industrial Average rising while the Nasdaq Composite also gained ground as rate-sensitive growth names recovered some of the previous session’s losses. Crude oil prices retreated modestly as the dollar strength eased.

Hot CPI Print Spooks Markets, Tech Leads 3% Decline

Wednesday 14 October brought the week’s pivotal macroeconomic event: the September Consumer Price Index report, which exceeded consensus expectations across the board. The headline CPI rose 0.6% month-over-month and 3.7% year-over-year, surpassing forecasts of 3.6% annual inflation. Core CPI, which excludes volatile food and energy prices, increased 0.3% month-over-month against expectations of a 0.2% rise, while core inflation on an annual basis reached 2.6% versus forecasts of 2.5%.

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The hotter-than-expected inflation reading initially spiked market-implied odds of an October rate hike above 50%, though pricing subsequently settled at approximately 37%. However, the more consequential market reaction was a sharp selloff in technology stocks. Information technology was the worst-performing S&P 500 sector on the day, falling 3.00%, while healthcare led with a gain of 2.44% and consumer staples rose 2.21%. The Nasdaq Composite dropped 1.88% and the S&P 500 fell 1.11% as the 10-year Treasury yield briefly climbed to 5.278% before reversing.

The session’s divergence was stark: capital flowed decisively out of AI-linked names and into defensive sectors that generate cash flows independent of the data centre buildout. The CBOE Volatility Index ticked higher but remained contained, rising 0.95 points to 16.22.

PPI Jumps 1.3%, Retail Sales Beat; Yields Drop, Dow 556

Thursday 15 October delivered a second consecutive inflation surprise, with the September Producer Price Index surging 1.3% month-over-month, more than double the expected 0.6% increase and the largest single-month gain since March 2022. On an annual basis, headline PPI accelerated to 6.3%, the highest reading in over three years and well above the 5.3% consensus estimate. Core PPI, excluding food and energy, rose 0.7% month-over-month and 5.0% year-over-year, both representing significant accelerations from the prior month.

Retail sales for September also exceeded expectations, rising 0.8% month-over-month against forecasts of a 0.3% gain, following an upwardly revised 1.3% increase in August. Initial jobless claims for the week ending October 10 rose marginally to 199,000, slightly below the 200,000 consensus estimate, while continuing claims fell to 1.71 million.

Despite the inflationary data, Treasury yields declined sharply. The 10-year yield fell 10.5 basis points to 5.085%, as investors focused on the surge in neocloud borrowing costs, which threatened to slow the AI infrastructure buildout and, by extension, broader economic activity. The Dow Jones Industrial Average surged 556.21 points, or 1.08%, to 52,177.69, led by consumer, healthcare and financial stocks. The S&P 500 added 0.33% to 7,744.06, while the Nasdaq Composite managed a marginal gain of 0.08% to 26,713.03.

Tech Rout Deepens, VIX Spikes Above Long-Term Average

The week concluded on Friday 16 October with an intensification of the technology selloff, as the Nasdaq Composite fell 2.1% to 26,140.03 and the S&P 500 dropped 1.1% to 7,659.44. The Dow Jones Industrial Average shed 175.28 points, or 0.3%, to 52,002.41, though it retained its weekly gain. The CBOE Volatility Index surged above its long-term average in afternoon trading, reaching 17.02, while the Nasdaq-focused VXN jumped to 22.89, underscoring the growing divide between mega-cap technology weakness and broader market resilience.

Semiconductor stocks extended their historic rout. The Philadelphia Semiconductor Index sank more than 12% over the week, marking its eighth consecutive daily decline and its longest losing streak since 2006. Short sellers amassed an estimated $32 billion in gross paper gains over the seven-day period, according to S3 Partners data. Crude oil prices continued their ascent, with WTI crude jumping 4.17% weekly to $97.65 per barrel, while the 10-year Treasury yield eased to 5.09%, poised for back-to-back weekly declines for the first time since June.

S&P 500 Falls 1.95% as Tech Wreck Offsets Defensive Gains

The S&P 500 opened the week at 7,812.01 and closed at 7,659.44, a weekly decline of 152.57 points, or 1.95%. The index reached a weekly high of 7,812.01 on Monday and a weekly low of 7,659.44 on Friday. In the final session, the index opened at 7,744.06, reached an intraday high of 7,780.12, and an intraday low of 7,650.88, before closing at 7,659.44.

The decline was driven almost entirely by the information technology sector, which plunged 6.24% for the week. Microsoft fell 7.2%, Nvidia dropped 5.8%, and Apple declined 4.1%, together accounting for a substantial portion of the index’s weekly loss. These moves were triggered by the broad reassessment of AI financing conditions and the hot CPI and PPI prints. Defensive sectors provided a partial offset: consumer staples gained 5.53%, healthcare rose 4.38%, and energy advanced 2.38%. The S&P 500’s move was highly concentrated, with eight of eleven sectors posting gains while the index itself declined, a testament to the outsized weight of technology in the benchmark.

Nasdaq Composite Plunges 4.5% on AI Financing Fears

The Nasdaq Composite opened the week at 27,372.24 and closed at 26,140.03, a weekly decline of 1,232.21 points, or 4.5%. The index reached a weekly high of 27,372.24 on Monday and a weekly low of 26,140.03 on Friday. In the final session, the index opened at 26,713.03, reached an intraday high of 26,890.45, and an intraday low of 26,100.22, before closing at 26,140.03.

Technology, semiconductor and AI-related stocks bore the brunt of the selling. Nvidia fell 5.8% for the week, Microsoft dropped 7.2%, and Meta Platforms declined 6.1%. Growth stocks were pressured by rising real yields, even as nominal Treasury yields declined, and by mounting scepticism over the durability of the AI capital expenditure cycle.

Interest-rate expectations remained a key driver: the market-implied probability of an October rate hike settled at 37% after the CPI release, but the more significant factor was the surge in neocloud borrowing costs, which threatened to slow the AI infrastructure buildout. Treasury yields declined over the week, with the 10-year yield easing to 5.09%, providing little support to growth stocks given the sector-specific nature of the selloff.

Russell 2000 Tumbles 3% Below 200-Day Moving Average

The Russell 2000 opened the week at 2,805.54 and closed at 2,721.37, a weekly decline of 84.17 points, or 3%. The index reached a weekly high of 2,805.54 on Monday and a weekly low of 2,721.37 on Friday.

Small caps underperformed the broader market, sinking below their 200-day moving average as interest-rate sensitivity and domestic economic expectations weighed on sentiment. The hotter-than-expected CPI and PPI prints raised concerns that borrowing costs would remain elevated for longer, disproportionately affecting smaller companies with higher debt burdens.

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Financial conditions tightened modestly, and risk appetite diminished as investors rotated into large-cap defensives. Small caps did not participate in the defensive rotation, as the sectors that led the market higher—consumer staples and healthcare—are dominated by large-cap names. The Russell 2000’s decline reflected both rate sensitivity and a broader risk-off tone in equity markets.

S&P 100 Slips 1.8% as Mega-Cap Tech Weakness Dominates

The S&P 100 opened the week at 3,512.45 and closed at 3,449.23, a weekly decline of 63.22 points, or 1.8%. The index reached a weekly high of 3,512.45 on Monday and a weekly low of 3,449.23 on Friday.

Mega-cap technology weakness was the dominant factor, with the Magnificent Seven collectively declining 5.4% for the week. Defensive positioning provided a partial offset, as consumer staples and healthcare constituents gained ground.

The index’s decline was less severe than the Nasdaq Composite’s because it includes a broader mix of sectors, including financials and healthcare, which helped cushion the fall. The divergence between the S&P 100 and the Nasdaq Composite underscored the concentration of selling pressure in technology and AI-linked names.

Dow Composite, Transports and Utilities Diverge on Yield Moves

The Dow Jones Composite Average opened the week at 13,245.67 and closed at 13,412.89, a weekly gain of 167.22 points, or 1.26%. The index reached a weekly high of 13,412.89 on Thursday and a weekly low of 13,245.67 on Monday.

The Dow Jones Transportation Average opened the week at 16,890.34 and closed at 16,712.45, a weekly decline of 177.89 points, or 1.05%. The index reached a weekly high of 16,890.34 on Monday and a weekly low of 16,712.45 on Friday. Transportation stocks were pressured by rising oil prices, which increased fuel costs, and by concerns that slower AI infrastructure spending could weigh on freight demand.

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The Dow Jones Utility Average opened the week at 1,045.67 and closed at 1,078.34, a weekly gain of 32.67 points, or 3.12%. The index reached a weekly high of 1,078.34 on Thursday and a weekly low of 1,045.67 on Monday. Utilities benefited from the decline in Treasury yields and from defensive positioning, as investors sought stable cash flows amid the technology selloff.

The divergence between these indices reflected the interplay of Treasury yields, energy prices and defensive positioning. Utilities and the broader Dow Composite benefited from falling yields and defensive rotation, while transportation lagged due to higher oil prices and growth concerns.

Philadelphia Semiconductor Index Sinks 12% in Longest Losing Streak Since 2006

The Philadelphia Semiconductor Index (SOX) opened the week at 6,845.23 and closed at 6,023.45, a weekly decline of 821.78 points, or 12%. The index reached a weekly high of 6,845.23 on Monday and a weekly low of 6,023.45 on Friday.

The semiconductor sector experienced its longest losing streak since 2006, driven by mounting concerns over AI-related financing conditions. Nvidia fell 5.8%, AMD declined 9.2%, and Broadcom dropped 7.6% for the week. The selloff was triggered by fears that rising debt levels at AI-focused neocloud companies could slow the data centre buildout, reducing demand for semiconductors.

Trade and tariff developments remained a background concern, but the primary driver was the reassessment of AI investment sustainability. Treasury yields declined over the week, but this provided little support to semiconductor stocks given the sector-specific nature of the selloff.

NYSE Composite Falls 1.2% but Shows Broader Participation Than Nasdaq

The NYSE Composite Index opened the week at 18,945.67 and closed at 18,718.34, a weekly decline of 227.33 points, or 1.2%. The index reached a weekly high of 18,945.67 on Monday and a weekly low of 18,718.34 on Friday.

The NYSE Composite showed broader participation than the Nasdaq, with eight of eleven S&P 500 sectors posting gains. The index’s decline was driven primarily by technology and industrial stocks, while consumer staples, healthcare and energy provided support.

Breadth was relatively healthy, with more than 60% of NYSE-listed stocks advancing for the week, reflecting the defensive rotation within the market. The NYSE Composite’s decline was less severe than the Nasdaq Composite’s because it includes a larger proportion of value-oriented and defensive sectors.

S&P MidCap 400 and SmallCap 600 Decline on Rate Concerns

The S&P MidCap 400 opened the week at 3,245.67 and closed at 3,178.45, a weekly decline of 67.22 points, or 2.07%. The index reached a weekly high of 3,245.67 on Monday and a weekly low of 3,178.45 on Friday.

The S&P SmallCap 600 opened the week at 1,456.78 and closed at 1,423.56, a weekly decline of 33.22 points, or 2.28%. The index reached a weekly high of 1,456.78 on Monday and a weekly low of 1,423.56 on Friday.

Both indices were pressured by rising rate concerns following the hot CPI and PPI prints. Domestic economic expectations remained relatively stable, but credit conditions tightened modestly, and risk appetite diminished. Mid-cap and small-cap stocks underperformed large caps, as the defensive rotation favoured larger, more liquid names with stable cash flows. Interest-rate sensitivity was a key factor, with smaller companies more vulnerable to higher borrowing costs.

Volatility Indices: VIX Spikes to 17.02, VXN Jumps to 22.89

The CBOE Volatility Index (VIX) opened the week at 15.27 and closed at 17.02, a weekly gain of 1.75 points, or 11.46%. The VIX reached a weekly high of 17.02 on Friday and a weekly low of 15.27 on Monday.

The CBOE Nasdaq Volatility Index (VXN) opened the week at 19.45 and closed at 22.89, a weekly gain of 3.44 points, or 17.69%. The VXN reached a weekly high of 22.89 on Friday and a weekly low of 19.45 on Monday.

The CBOE S&P 500 3-Month Volatility Index (VIX3M) opened the week at 18.12 and closed at 19.45, a weekly gain of 1.33 points, or 7.34%.

Volatility expectations increased across the board, with the VXN rising more sharply than the VIX, reflecting the concentrated selling pressure in technology and semiconductor stocks. The VIX’s move above its long-term average of approximately 17 indicated rising demand for protection, though it remained below the levels seen during previous market dislocations. The divergence between the VIX and VXN underscored the sector-specific nature of the selloff.

S&P 500 Sector Performance: Consumer Staples Gains 5.53%, Tech Plunges 6.24%

Consumer Staples led all sectors with a weekly gain of 5.53%, benefiting from the rotation into defensive, cash-generative businesses. Coca-Cola advanced nearly 7% in October and 31% year-to-date, while Kimberly-Clark gained 7% for the week and Nike added 6.6%.

Healthcare was the second-best performer, rising 4.38% for the week. The sector benefited from the same defensive rotation, with Eli Lilly gaining more than 3% on Thursday and UnitedHealth rising over 2%.

Energy advanced 2.38% as crude oil prices surged on Middle East supply concerns. Communication Services rose 1.63%, while Materials gained 1.40%. Real Estate added 0.82% and Utilities rose 0.51%, both supported by the decline in Treasury yields. Financials were essentially flat, posting a marginal gain of 0.01%.

Consumer Discretionary declined 0.50%, Industrials fell 2.35%, and Technology was by far the worst performer, plunging 6.24% for the week. The technology sector’s decline was driven by the semiconductor rout and broader concerns about AI capital expenditure sustainability.

The week’s clear rotation theme was out of growth and into value, with the spread between consumer staples and technology exceeding 11 percentage points. Rate-sensitive sectors benefited from falling yields, while AI-linked names faced mounting scepticism about the durability of the investment cycle.

Biggest Gainers and Losers: Defensive Stocks Shine, Tech Giants Slide

Among major index constituents, the largest weekly gains were concentrated in defensive sectors. Coca-Cola rose 7.0%, Kimberly-Clark gained 7.0%, Nike added 6.6%, Eli Lilly advanced 5.2%, and UnitedHealth gained 4.8%. These moves were driven by the rotation into consumer staples and healthcare, as investors sought stable cash flows amid the technology selloff.

The largest weekly declines were concentrated in technology and semiconductor stocks. Nvidia fell 5.8%, Microsoft dropped 7.2%, AMD declined 9.2%, Broadcom dropped 7.6%, and Meta Platforms declined 6.1%. These moves were triggered by the reassessment of AI financing conditions and the hot inflation prints, which raised concerns about the sustainability of the AI investment cycle.

Magnificent Seven: Apple, Microsoft, Nvidia Lead Mega-Cap Declines

Apple declined 4.1% for the week, pressured by the broad technology selloff and rising real yields. Microsoft fell 7.2%, hit by concerns over AI capital expenditure sustainability and the neocloud financing squeeze. Alphabet dropped 5.3%, while Amazon declined 4.7%. Nvidia fell 5.8%, extending its losing streak amid the semiconductor rout. Meta Platforms declined 6.1%, and Tesla fell 3.9%.

The Magnificent Seven collectively declined 5.4% for the week, materially influencing the major indices. The group’s weakness accounted for a substantial portion of the S&P 500 and Nasdaq Composite declines, underscoring the outsized weight of mega-cap technology in the benchmarks. The selloff was driven by the reassessment of AI financing conditions and the hot inflation prints, which raised concerns about the durability of the AI investment cycle.

Federal Reserve, Bond Market and Rate Expectations: Yields Fall for Second Week

Federal Reserve communication during the week reinforced market expectations that the central bank will hold interest rates steady at its October 28 meeting. On Tuesday 13 October, New York Fed President John Williams said he continues to see one more rate hike as appropriate in 2026 but does not anticipate further increases in 2027. Federal Reserve Governor Christopher Waller said the recent climb in US bond yields primarily reflects stronger economic growth rather than elevated inflation expectations, which he described as “well anchored”.

The FOMC minutes from the September 15-16 meeting, released on 7 October, showed unanimous support for the 25-basis-point tightening delivered at that meeting, with most participants indicating that another tightening would likely be appropriate before year-end. However, the minutes provided no clear signal on the timing of any further move, and markets subsequently priced the October meeting as a likely pause.

In the Treasury market, yields declined across the curve for a second consecutive week. The 2-year Treasury yield fell 5.5 basis points to 4.734%, marking its largest one-week decline since 7 August and its third consecutive weekly decline. The 5-year yield declined to approximately 5.00%, while the 10-year yield eased to 5.09%, down roughly 26 basis points from the 24½-year high of 5.3645% reached the prior week.

The 30-year yield held near 5.42%. The 2s10s spread remained slightly inverted, though the decline in shorter-dated yields was more pronounced than at the long end, resulting in a modest steepening of the curve.

In currency markets, the US Dollar Index retreated from its 18-month high near 103.00 to close the week around 101.60, posting its first weekly decline after three consecutive weeks of gains. EUR/USD strengthened to approximately 1.1253, gaining 0.56% on Friday. GBP/USD rose to 1.3275, up 0.62%, benefiting from UK economic data showing unexpected growth. USD/JPY traded near 158.00, with the yen finding some support from the broad dollar pullback. Investors will monitor the October 28 FOMC decision and the accompanying policy statement, alongside the Fed’s preferred inflation gauge, the Core PCE Price Index, due later in the month. Corporate earnings from major technology and semiconductor companies, as well as further developments in AI-related credit conditions and Middle East geopolitical tensions, remain key variables for market direction.