What happened in the market
The AI high ground suddenly looked slippery. Over three weeks, doubts piled up that the profits from AI will justify the borrowing boom behind it, and the rout peaked Friday when the Nasdaq 100 slid 3.5% for its biggest one-day fall since early June.
Semiconductors led the stumble. Intel plunged 29% after a weak sales outlook - its steepest drop in more than four decades - dragging peers such as Nvidia and Broadcom lower. Amazon and Alphabet also fell after reaffirming aggressive AI investment while their main businesses soften, and the pullback broadened to drag other major indexes lower as investors moved to safety.
This is not the first AI shakeout, and buying dips has worked before. But since the Nasdaq 100 started falling early this month, rising rates have tightened the screws and amplified doubts that AI will deliver the hoped-for profit windfall.
Where investors moved their money
Diversification got a second wind. A mix of Treasuries, high-grade credit, defensive equities and commodities logged its best monthly return since late 2020. The largest long-duration Treasury ETF, TLT, rose more than 5% for its strongest month in over a year, helping a basic 60-40 portfolio gain more than 1% in October.
On the stock side, utilities and consumer staples - sectors seen as less tied to the business cycle - each climbed more than 10% in October. An equal-weight version of the S&P 500, which reduces the pull of the biggest names, advanced nearly 5%, its best monthly edge over the market-cap-weighted index since 2009. Energy rallied with crude, and low-volatility shares beat high-volatility names by the widest margin since 2002.
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Finding assets untouched by AI sentiment is harder than it sounds. Heavy borrowing to chase AI leadership is set to push global bond issuance to a record in 2026, and that deluge competes with US government debt for investor cash, influencing Treasuries too.
Who gained and who lost
Momentum cut both ways. From the month's outset through last Friday, hedge funds fell 3.3%, and JPMorgan client data indicate long-short funds had their weakest showing versus the broader market since early 2021. "Momentum investing works both ways - especially when it is so over-owned, as is the current situation," said Mark Freeman, Socorro Asset Management LP's chief investment officer. "Given the increase in yields, investors now have the option of looking outside of just equities."
Yet retail dip-buying showed up. The Direxion Daily Semiconductor Bull 3X ETF (SOXL) drew a record 7 billion dollars of inflows this month, while the ProShares UltraPro QQQ (TQQQ) attracted 2 billion dollars. Chip stocks led the October downdraft in technology after Alphabet and Meta disclosed negative cash flows, highlighting the perils of taking on lots of debt to cement AI leadership.
What pros are saying - and the portfolio takeaway
"Investors are spooked because the promise of the free cash flow now is further away," added Sarah Ketterer, CEO of Causeway Capital Management.
Correlations are the other headache. "To make sure that we have a better balance between the AI and non-AI trade, that was one of the bigger things that we had to deal with over the last couple of months." The bottom line: when rates rise and a theme gets crowded, leadership can flip fast - and bonds plus defensive sectors can cushion your portfolio when it does.
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