The Dow fell 600 points today — and it was still the only major index to finish the week green. The S&P lost 0.5% on the week. The Nasdaq lost 0.7%. And buried in that data is the number that tells the whole story of October: the S&P 500 Excluding AI index is now outperforming the S&P 500 itself.
The Close
Ugly close to a wild week. The Dow dropped 1.2% — about 650 points — to roughly 52,215. The S&P 500 fell 0.5% to about 7,625. The Nasdaq slipped 0.2% to about 25,960.
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| Dow Jones | 52,215 | −1.2% | ||
| S&P 500 | 7,625 | −0.5% | ||
| Nasdaq | 25,960 | −0.2% | ||
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| Energy | +2.6% | |||
| Technology | +0.5% | |||
| Real Estate | +0.1% | |||
| Utilities | −0.7% | |||
| Materials | −0.7% | |||
| Health Care | −1.1% | |||
| Industrials | −1.3% | |||
| Financials | −1.3% | |||
| Consumer Disc | −1.7% | |||
| Comm Services | −1.8% | |||
| Consumer Staples | −1.9% | |||
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The selling was broad. Eight of eleven sectors closed red. Consumer staples fell 1.9% — the worst sector, one day after being the best. Financials and industrials each dropped 1.3%.
Energy was the one bright spot, up 2.6% as oil rose on Middle East tensions. Tech gained 0.5% — the only other sector with a real bid.
For the week: the Dow gained 0.4%. The S&P lost 0.5%. The Nasdaq shed 0.7% — its second straight losing week. The Dow is the only index that hasn't given back its October gains.
What The Market Is Pricing In
CNBC ran a number this week that stopped me cold. The S&P 500 Excluding AI index — all the stocks in the S&P that aren't part of the AI trade — closed Thursday up 12.4% on the year. The regular S&P 500 was up roughly 12%. The non-AI stocks are now beating the AI stocks.
That gap closed entirely in October. At the start of the month, AI names were carrying the index. Now the rest of the market has caught up — not because it rallied, but because the AI trade fell apart. Non-AI stocks are up 6.6% in October while the full S&P is down 0.4%.
When one group of stocks carries an index for months and then gives back its lead in a few weeks, it tells you the market is recalibrating what it's willing to pay for that theme. On Wall Street they call this a thematic unwind — when a trade that everyone owned at the same time gets sold at the same time. AI was the most crowded trade of 2026. Now it's unwinding.
The S&P 500 Excluding AI is up 12.4% this year — the S&P 500 with AI is up 12%. The premium that carried the market for eight months evaporated in three weeks. That's not a rotation. That's a repricing of what AI is worth at 5.33% on the 10-year.
The Dow's 600-point drop today is a separate story. Oil rose on Middle East escalation. The stocks that benefited from lower energy prices last week gave those gains back today. The selloff spread from tech to everything — which is what happens when a market that was already nervous gets a new reason to sell.
I saw a version of this thematic unwind in 2000 when the dot-com premium evaporated over the course of a single quarter. The broader market held up while the internet stocks gave back two years of gains in four months. The timeline today is compressed — three weeks instead of four months — but the pattern is the same: a crowded trade unwinds when the cost of holding it rises.
What's Next
Three things I'm watching next week:
01 — Amazon earnings — Thursday, October 29
The biggest AI spender left to report. Amazon's AWS margins and capex guidance will tell you whether the capex backlash that hit Meta extends to the cloud. If AWS revenue accelerates and margins hold, Amazon breaks the four-for-four pattern. If capex guidance rises without a matching revenue increase, it confirms it.
02 — PCE inflation — Friday, October 30
The Fed's preferred inflation measure arrives next Friday. After the CPI came in hot at 3.7% on October 14, the PCE will tell you whether the inflation story looks the same through the Fed's lens. Core PCE above 0.3% month over month keeps the October hike alive.
03 — The Dow-Nasdaq gap
The Dow gained 0.4% this week while the Nasdaq lost 0.7%. Watch whether that gap widens or narrows. If the Dow keeps outperforming, the market wants earnings and dividends over growth and promises. If the Nasdaq catches a bid, the thematic unwind may be near its end.
The AI premium that carried the S&P 500 for most of 2026 is gone. What replaces it — earnings discipline, value, dividends — is the story of the next three months.
That's it for today. Have a good weekend. I'll be back on Monday after the close.
