In December 1972, a fund manager on Wall Street could have told you with a straight face that Polaroid, Avon Products, and Xerox were the safest investments in America. These were the Nifty Fifty! A collection of 50 companies so dominant, so inevitable, that the prevailing wisdom was to buy them at any price and never sell. Polaroid traded at 90 times earnings. Avon fetched 65 times. Nobody even blinked.

By October 1974, Polaroid had fallen 91%. Avon dropped 86%. Polaroid was still growing. Avon was still profitable.

The problem wasn't the companies.

The biggest problem was the concentration of investment into a narrow slice of the market at prices that assumed perfection in perpetuity. When sentiment shifted, there was no margin of safety left and nowhere to hide.

I bring this up because of a number that most investors know inherently, or have thought about but haven't fully internalized.

As of today, information technology represents roughly 31% of the S&P 500 by weight. Add in the tech-adjacent names classified under communication services and consumer discretionary, (here I’m talking about Alphabet, Meta, Amazon, Tesla etc.), and the top ten stocks alone account for close to 40% of the index. If you own an S&P 500 index fund, you are still making a concentrated bet on one corner of the market whether you intended to or not.

For the past 15 years, that bet worked. Technology stocks carried the index. According to FactSet data through late February, tech-driven companies accounted for roughly 66% of the S&P 500's total year-over-year earnings growth in Q4 2025. The AI capex cycle was real, Nvidia's results were extraordinary, and the market obviously rewarded concentration with more concentration.

But this shifted in early 2026. Technology is the worst-performing S&P 500 sector year-to-date. The Nasdaq is down over 2% while the equal-weight S&P 500 has begun outperforming the cap-weighted version, which is a reversal that S&P Dow Jones Indices flagged in late January.

Energy is up nearly 22% YTD. Materials are up over 16%. Consumer staples, the most boring corner of the market, have gained more than 15%. The sectors that investors ignored for two years are now leading, and the sector they couldn't get enough of is dragging.

This is what the early stages of a rotation look like. And if history is any guide, rotations that begin with this kind of breadth divergence tend to persist for 12 to 18 months.

The math of concentration risk is straightforward but worth stating plainly. If technology is 31% of your equity portfolio and the sector declines 20%, which has happened three times in the past 25 years, that single sector costs you 6.2% of total portfolio value.

In the 2022 bear market, the Nasdaq fell 33%. Applied to a 31% tech weight, that's a 10% hit to an otherwise diversified portfolio from one sector alone. You don't need a catastrophe to see a significant drop in this case. You just need a repricing from expensive to fair value.

The valuation gap makes this particularly relevant right now. The S&P 500 trades at approximately 21.6 times forward earnings. Strip out the mega-cap tech names and that multiple compresses meaningfully.

Meanwhile, financials trade around 15 times forward earnings with net interest income expanding and investment banking activity recovering. Healthcare, perpetually underloved, sits at roughly 16 times forward earnings with GLP-1 drugs creating a genuine secular growth story. Energy companies are trading at single-digit multiples while generating record free cash flow.

I'm not arguing that technology is broken. Nvidia's Blackwell architecture is sold out. The hyperscalers have committed over $500 billion in 2026 capital expenditures. AI infrastructure spending is real and accelerating. But there is a difference between a sector with strong fundamentals and a sector that deserves a third of every dollar invested in American equities. The former can be true while the latter is still a big problem.

What I'm doing in my own positioning is simple. I've been trimming tech exposure from roughly 30% to closer to 20% of equities, redeploying into three areas:

Financials (XLF) - the combination of rate normalization and deregulation creates a multi-quarter tailwind.

Healthcare (XLV) - offers both defensive characteristics and genuine growth through the GLP-1 and biotech pipeline.

Materials (XLB) - The gold and copper rallies reflect structural demand that extends well beyond a single quarter.

This isn't a call to sell all your technology stocks. But you should look honestly at what you own, recognize that passive indexing has created a historically unusual concentration in one sector, and ask whether that concentration is intentional or accidental.

For most investors, it's accidental. And accidental concentration is the kind that hurts worst, because you don't realize how exposed you are until the sector that carried you starts to lag.

The Nifty Fifty investors of 1972 learned the lesson that even great companies become bad investments when too much capital crowds into too narrow a space. The companies didn't fail. The portfolio construction did. I think that lesson is worth revisiting right now.

The Earnout Investor provides analysis and research but DOES NOT provide individual financial advice. Jamie Dejter may have a position in some of the stocks mentioned. All content is for informational purposes only. The Earnout Investor is not a registered investment, legal, or tax advisor, or a broker/dealer. Trading any asset involves risk and could result in significant capital losses. Please, do your own research before acquiring stocks.