The evidence supports a narrower story than the headlines suggested. The October–early November drawdown was concentrated in the Nasdaq-100 and semiconductors. The S&P 500 was far more resilient, and the Dow and the defensive and financial sectors often moved on a different track. The data are not equally reliable across the window. The material through Monday, Nov 2 is well corroborated. Nov 3–4 is reasonably documented. Nov 5–6 is thin, and it often contradicts the closing data. The conclusions below are weighted accordingly.
How the drawdown built, Oct 22 – Nov 2
A slide that predates the final week
The pressure started before the last week of October. Oct 22 was the S&P 500's worst day since July, with a close at 7,663.43 7,8,46,74. The week ending Oct 30 was the index's third straight losing week 74.
Midweek gave no warning of what followed. Through Wednesday the S&P 500 was up 1.6%, the Nasdaq Composite up 2.3% and the Dow up 0.5% 25,36,49. Friday erased those gains. The S&P 500 fell 1.8%, the Nasdaq Composite 2.9%, the Dow 1.1% and the Russell 2000 1.7% 36,74. The week ended down 0.6% for the S&P 500, 2% for the Nasdaq and 0.9% for the Dow 25,36. The damage was already uneven. The technology-heavy index took roughly three times the weekly loss of the broad index.
The low on Nov 2
Monday, Nov 2 is the cleanest reading of where the damage sat. The S&P 500 fell 0.51% to 7,541.40 and the Nasdaq fell 1.07% 57. The Nasdaq-100 closed more than 10% below its Oct 6 record, which is correction territory 45,66. The Dow, meanwhile, rose 0.41% to 51,983.98 57. That divergence between growth and the price-weighted blue-chip average is the first sign that this was a sector problem and not a market-wide one.
Semiconductors were the sharpest part of it. The SOX fell 3.37% 60. A separate account has the Philadelphia Semiconductor Index falling 3.8% and settling below its late-July low 44. SOXX had fallen 10% over three days 61. AMD fell 7.52% and Intel 8.8% ahead of AMD's report 57. The selloff did not stay in the US. Korea's Kospi fell 3.6% and Taiwan closed down 3.59% 59,60, and chip stocks were also down across Europe 45. A drawdown that shows up in several regions in the same sector is a stronger signal than a one-market move.
The stock-specific catalysts
Two catalysts are named for the Friday break. Tech sold off after results from Alphabet, Amazon and Intel 74. Intel is the best-corroborated fact in the set. It fell 29% on Friday on a PC-softness forecast, which was its worst day since the 1970s. Six sources assert one version and three another 10,11,12,13,14,15,20,24,33,37,50. One source gives the drop as 28.58% 53, which is consistent with a figure of roughly 29%.
The second thread is the return on AI capex. Meta turned negative after reporting negative free cash flow and raising the floor of its capex guidance 30,35. A single X post claims Alphabet fell about 9% after hours 51. I would not lean on that claim.
Apple was the main stock-specific shock on Monday evening. The stock had slipped about 2% before its report, a figure twelve sources support 11,13,14,15,17,18,19,20,24,39,41,79. It then fell roughly 2.7–4.5% after hours, with a margin warning cited as the reason 21,56,58,80. That decline weighed on index futures 55. Management said the margin change excluding tariffs was about one point sequentially 32. The size of the Tuesday follow-through is disputed. One source gives a 1.9% decline and others about 3% 62,64,65. The direction is not in doubt, but the magnitude is.
Not an earnings failure
If the cause was not earnings, what was it? By Nov 2, 340 S&P 500 companies had reported, and 78% beat estimates 75. Some stocks still fell on results. Palantir fell 2–3% despite an adjusted earnings beat, Gartner fell 13%, Thomson Reuters 7.5% and Pfizer 1% 22,34,42,48. Of 52 reports since Oct 13, 29 saw moves smaller than the options-implied move 71. That is not the profile of a market collapsing on broad earnings disappointment.
Positioning and concentration look like the better explanation. The equal-weighted S&P 500 lagged the cap-weighted index by 3.2 points year to date through Oct 31 75. This shows how much of the index's return depended on a narrow group of mega-caps. The momentum ETF SPMO fell 10.1% in October 54. When leadership is that narrow, a hit to the leaders can dominate the index without the average stock confirming it. That is why the S&P 500 sat only about 4% below its record of 7,844.52 at the Nov 2 close 57,78, while the Nasdaq-100 was in correction. The valuation arguments circulating on social media, including an unsourced Howard Marks attribution on forward P/Es and later returns 52 and a post saying the SPY multiple is dropping 63, are interpretation and not data. I give them no weight here.
Election week: recovery, then rotation
Nov 3
On Tuesday, Nov 3 the indices recovered. The S&P 500 rose 0.36% to 7,568.92, which broke a three-session losing run. The Nasdaq Composite rose 0.83%, the Nasdaq-100 about 0.7% and the Dow fell 0.38%, or 197.26 points 28,29. The Nasdaq-100 stayed about 10% below its high 29. Some sources attribute Monday's figures to "Tuesday", such as the Nasdaq Composite dropping 1.07% and the S&P 500 falling 0.51% 78. These are date-labelling errors, not a real conflict. Commentary at the time flagged oversold conditions in the Nasdaq-100 and bearish momentum in the S&P 500 78. That is a mixed internal picture: a bounce inside a damaged trend, not a repaired one.
Nov 4
Wednesday, Nov 4 was the most striking session, because the futures and the cash market disagreed. Futures first reacted to early projections of a Democratic Congress, with Nasdaq-100 futures down as much as 2.2% 46. The cash session then reversed. By midday the Dow was up about 1,500 points, the S&P 500 up 1.8% and the Nasdaq up 2.0% 43,67. The S&P 500 closed up 1.58% 46. The Dow closed up 1,569 points, or 3.03%, at 53,356.12, its best day since April 2025 23. The closing figures for the Dow come from several sources and can be treated as firm.
The composition of the rally matters more than its size. Consumer Staples SPDR rose 3.4% while Energy SPDR fell 4.7% 46. Crude oil fell sharply, with figures of nearly 8% and US crude down 4.3% to $91.99 that morning 43,69. Within technology the split was clear. Microsoft rose roughly 6–6.7%, Alphabet about 4%, and Visa and JPMorgan also rose 43,68,69. Micron fell 7.21%, Intel 4.26%, Chevron about 3.6–3.9% and Tesla about 2–3.3% 16,27,31,68. Data-center-linked stocks fell 40. The leadership was different from what led October's decline. Capital moved toward staples, financials and the software and platform names, and away from energy and the chip and data-center complex.
Not every level is settled, even here. Brent is given as down 1.12% on Election Day but also as about $107 and up 2% 29,60. The year-to-date gain for the S&P 500 is cited as 10%, 11.8%, 12% and 13% 1,2,3,4,30,35,66,82. This probably reflects different dates, not a true disagreement.
What cannot be trusted: Nov 5–6
The Nov 5 evidence conflicts sharply with the Nov 4 closing data. Unverified Reddit commenters cite the Russell 2000 down about 5%, SPY down about 5.6% and the S&P 500 down about 10.5% over two sessions 83. Other single-source claims cite $NDX down 6.4% in a day, QQQ losing 6.5% in a Nov 5 selloff, QQQ at −5.28% open-to-close on Nov 5, and semiconductors down 10–15% 70,72,73,81. A different dataset shows SPY closing at 735.29, up 2.29 38. By Nov 6 the Nasdaq-100 had rebounded 1.35%, the VIX was down 19.92% and S&P 500 futures were up 0.6% 26,81.
I cannot reconcile a 10.5% two-day S&P 500 loss with the Nov 6 rebound or with a record of 7,844.52 78, so I treat the extreme Nov 5 numbers as unconfirmed. Commenters also disagreed on whether the selloff was AI-specific or broad 83. That disagreement is itself informative, because it is the same question this note is trying to answer. The only calm volatility reading, a VIX of 16.34, comes from sources dating back to September and says little about this window 5,6,9,47,76,77.
Implications and what would change the read
The read
The weight of the evidence points to a market under strain from AI-related earnings and capex worries, not from a general earnings failure. This is my interpretation of the data above. Chips and megacap technology fell (Intel, Meta, Apple's margins), while the Dow, staples and financials held up or led. That is consistent with a growth-to-defensive shift, at least in October and early November. The Nov 4 rally was driven by a different set of sectors from those that led the decline. In Dow Theory terms, the averages did not confirm one another on Nov 2. The Nasdaq-100 was in correction while the Dow rose, and the S&P 500 was about 4% from its record. That is the profile of a sharp secondary reaction concentrated in leadership, not of a broad primary reversal. Even so, the moves inside a single session were large enough to suggest a fragile, event-driven tape in which index levels and sector leadership can change within hours.
What we can say about durability
The Nov 5–6 data are not reliable enough to judge whether the Nov 4 reversal held. A patient reader should wait for confirmation. Three things would tilt the read toward the more bearish scenario: the Nasdaq-100 failing to reclaim its prior range, chip weakness spreading beyond semiconductors, or the S&P 500 following the Nasdaq-100 lower. The opposite outcome, with the Dow, staples and the platform names holding gains while semiconductors stabilize, would favor treating October as a concentrated shakeout.
Takeaways
- The damage was narrow. The Nasdaq-100 entered correction territory on Nov 2 and the harm was concentrated in semiconductors. The S&P 500 was only about 4% below its record at that close 57,78.
- Nov 4 was a rotation. The Dow's 3.03% gain and the staples-over-energy leadership are well documented 23,46. Tech split between Microsoft and Alphabet gains and chip losses.
- Apple and Intel are the best-corroborated stock shocks. They matter because they connect hardware demand and tariff-related costs to the broader tech weakness 11,12,13,14,15,17,18,19,20,24,39,41,79.
- Treat Nov 5–6 with caution. Reports of a 5–10% index decline rest on unverified commenters and single posts, while the closing-price data show a modest S&P 500 rebound by Nov 6 38,81.
