AI Stock Selloff: How Did Your Portfolio Hold Up?
The $3 trillion market rout from the ai stock selloff, the midterm shakeup and what diversification really delivered.
Wall Street entered November wondering whether the retreat from AI stocks signaled a healthy rotation. November 5 delivered a less comfortable answer: When the biggest technology stocks stumble, much of the market can fall with them.
Last week delivered one of Wall Street’s sharpest wake-up calls since the 2020 pandemic crash. The S&P 500 plunged 4.4%, the Nasdaq sank 5.5%, and the Dow dropped 3.4%, pushing the Nasdaq into correction territory. Nearly $3 trillion in S&P 500 market value vanished in a single session according to Dow Jones Market Data. With consumer sentiment already under pressure and investors heading for the exits, it’s little wonder CNN’s Fear & Greed Index needle is sitting in “Extreme Fear.”
The mid-term elections gave investors another reason to question a boom already facing expensive infrastructure, elevated financing costs and uncertain returns. The Democratic blue- sweep raised concerns about data-center restrictions. Margin calls and forced selling magnified the damage. Politics lit a match, but the market had been accumulating kindling for months.
When Everything Falls, Diversification Still Matters
Last Thursday put diversification to a real-world test. The equal-weighted S&P 500 ETF (RSP) lost about 2.9%, compared with 4.4% for the traditional index. The broad investment-grade bond ETF (AGG) edged higher on a provisional price basis. Crude oil moved up nearly 3% for its own reasons. Different assets did not all respond to the same headlines, although diversification did not prevent equity losses.
November 5, 2026 market performance. Sources: Yahoo Finance, historical market data; WTI crude oil, December futures settlement. Index and ETF returns reflect daily price changes, excluding dividends.
Diversified, or Just Diversified on Paper?
An S&P 500 index fund, a Nasdaq fund and a handful of popular AI stocks may look like three different investments while behaving like one crowded trade. Investors can own dozens of ticker symbols without realizing how much of their financial future depends on the same handful of companies. It’s like playing roulette and repeatedly betting on the same few numbers, even though the wheel offers 36 numbers plus zero.
The problem isn’t owning tech. It’s allowing yesterday’s biggest winners to dictate tomorrow’s retirement risk. The 10 largest S&P 500 stocks account for roughly 40% of the index, leaving the other 490 companies to share the remaining 60%. (source: S&P DJ Indices data) Broaden the definition to tech-related companies, and their combined influence approaches 45%. In a market-cap-weighted index, the biggest winners automatically gain more influence as their share prices rise. Owning more funds doesn’t necessarily mean owning more diversification, especially when those funds keep buying the same stocks.
In our clients’ all-weather strategic allocated portfolios, we look beyond the index’s default weights. Sector ETFs allow us to adjust exposure across the S&P 500’s 11 sectors, while smaller companies, international equities, alternatives, commodities, and high-quality bonds add different sources of return and risk. Periodic rebalancing keeps a successful position from quietly becoming an oversized bet.
None of this is a magic shield. Diversification can cushion a shock, not repeal one. The aim is to participate in innovation without making a family’s financial plan depend on the next earnings report from a handful of companies.
The $5 Trillion Paradox: October’s Rotation
To understand why November 5 rattled investors, rewind a few weeks. Yahoo Finance estimated that 47 major AI, chip and technology stocks lost about $5 trillion in market value from October 6 through October 30, while 625 other large U.S.-listed companies gained roughly $1.3 trillion. The market was beginning to find new leaders.
Illustration 1. AI-related losses versus gains elsewhere, Oct. 6–30. Source: Yahoo Finance
Nine of the S&P 500’s 11 sectors rose in October’s final week even as the index slipped. Energy, healthcare, financials and utilities drew fresh interest. We have argued that market leadership could broaden into 2027 without requiring the Magnificent Seven to collapse. Corporate earnings, not a change in fashion, must ultimately support that shift.
Illustration 3. Selected October sector returns before November’s reversal. Source: Nasdaq Market Intelligence Desk, Nov. 2, 2026.
November 5 exposed the limit of that optimism. All 11 sectors fell as investors sold what they could to raise cash. October showed that leadership could broaden. Thursday showed that a rush for liquidity can temporarily overwhelm even a sensible rotation.
The Blue Sweep Meets the Blue-Collar Buildout
Democrats’ midterm victories intensified scrutiny of data-center electricity bills, water use and local permitting. Communities can welcome investment and still object when a project strains their grid. The politics, however, are more complicated than a simple anti-AI storyline.
The same facilities employ skilled trades, construction contractors and local suppliers while generating orders for power equipment and utilities. Politicians must weigh those jobs against household costs and community concerns. Congress can influence the rules, but many practical decisions rest with state and local authorities. A delayed project can defer chip orders and raise financing costs without ever being canceled.
The Technology Can Win While Its Stocks Lose
Our recent “$10 Trillion AI Infrastructure Gamble” newsletter made a distinction worth repeating: AI can succeed spectacularly while some investors financing it do not. This is not necessarily another dot-com bust.
Microsoft, Alphabet, Amazon and Meta generate substantial profits and cash flow, unlike many internet hopefuls of 2000. But even profitable companies can overpay, overbuild or earn disappointing returns on enormous investments.
The financing divide matters. Cash-rich tech leaders have room to adjust spending. Leveraged operators buying expensive computing capacity have less room for error when borrowing costs stay high or projects slip. A stock falling 20% in a day may reveal a sudden change in expectations, not an equivalent collapse in the underlying business. It also does not automatically make the stock cheap.
A slower buildout could eventually improve industry discipline. In the meantime, it could hurt demand for chips, electrical equipment and construction. The irony is that what makes the AI industry healthier later may unsettle markets now.
What Matters After the ai stock Selloff?
We are watching three tests:
- Can earnings growth spread beyond the largest tech companies?
- Will AI spending produce returns that justify the capital committed?
- And will credit spreads and hiring suggest that market stress is reaching the real economy?
Those answers matter more than the next declaration that AI is either unstoppable or finished.
The Bottom Line: Seven Tech Stocks Are Not a Financial Plan: The blue sweep may change the pace of the AI buildout and led to the AI Stock Selloff. Higher interest rates make expensive mistakes harder to hide. Neither necessarily signals the end of the bull market. But when a handful of companies carry so much of the market’s weight, investors should know exactly how much they’re depending on them.
We remain constructive on AI’s long-term potential and cautious about concentration masquerading as diversification. The goal isn’t to abandon technology or predict the next correction. It’s to build a portfolio that can participate when innovation delivers and remain resilient when expectations disappoint.
The next chapter of this bull market may reward investors who own more than yesterday’s winners, without having to sell them all to get there.
For more information on our firm or to request a no-obligation investment and retirement check-up with Jon Ulin, CFP®, please call us at (561) 210-7887 or email jon.ulin@ulinwealth.com.
Note: Information provided on tax and estate planning is not intended to be a substitute for specific individualized tax or legal advice. We suggest that you discuss your specific situation with a qualified tax or legal advisor. This material was prepared with the assistance of AI. All content has been reviewed, edited, and approved by Ulin & Co Wealth Management prior to use.
You cannot invest directly in an index. Past performance is no guarantee of future returns.
Diversification does not ensure a profit or guarantee against loss. The information given herein is taken from sources that are believed to be reliable, but it is not guaranteed by us as to accuracy or completeness.
This is for informational purposes only and in no event should be construed as an offer to sell or solicitation of an offer to buy any securities or products. Please consult your tax and/or legal advisor before implementing any tax and/or legal related strategies mentioned in this publication as NewEdge Advisors, LLC does not provide tax and/or legal advice. Opinions expressed are subject to change without notice and do not take into account the particular investment objectives, financial situation, or needs of individual investors.
CFP Board owns the certification marks CFP®, CERTIFIED FINANCIAL PLANNER®, and CFP®
