Five tech giants now make up half of the S&P 500

Five companies drive half the S&P 500 while Spain's Ibex stays in the basement

An article argues the stock market is at the peak of a bubble. The discussion that thesis sparks quickly turns to a figure contributed by one participant: the S&P 500's market cap is heavily shaped by a handful of tech companies. By this calculation, Apple, Microsoft, Amazon, Alphabet and Meta account for around 50% of the index. If those five are overvalued — and some argue they are — the rest of the market is buried under their weight. Meanwhile, the Ibex 35, which five years ago hovered around 9,500 points, now sits near 8,800. Not much of a bubble there.

What it means for the market to be at the peak of a bubble

The peak thesis doesn't hold equally across all markets. In Spain the index has been losing altitude for half a decade, so the overvaluation argument loses its footing. Where it does bite is on Wall Street, and above all on the Nasdaq. There the conversation shifts: some point out that the Hang Seng dropped 25% in 2021 and a few already anticipate a similar path for the S&P 500. The KWEB fund went from 100 to 34, according to comments in the thread. The question isn't whether there's froth, but where it is.

The most common answer points to concentration. If five companies are worth half the index, the S&P 500 stops being a market thermometer and becomes a bet on five balance sheets. Excluding those tech names, many companies have traded sideways or declined for years, and now sit at reasonable multiples. There is value out there, but you have to look for it.

Why inflation changes the bubble math

With the money printers running at full estimulante ilegal, stocks aren't rising as fast as money is being devalued. A stock trading 300% higher than five years ago may be reflecting accumulated inflation rather than value creation, according to one opinion in the thread. That's where the fine calculation comes in: if a stock falls 10% and official inflation eats another 7%, the real loss exceeds 17%. The purge some consider healthy — another 15% or 20% — hasn't arrived yet.

The debate over cash also has substance. Holding liquidity with 7% annual inflation is a silent bleed. Hence Microsoft spending some 60 billion to buy Activision: better to pay for assets than watch the balance sheet evaporate, as one comment put it. For the small investor, the alternative is to keep a fixed percentage in cash — 20% is the most repeated figure — and deploy it when sales come, rather than exiting entirely to wait for the collapse.

When to get in: the question nobody can answer

The problem for those who wait is that the bottom doesn't send warnings. Whoever sold in September keeps watching their old portfolio barely move. Whoever has been waiting since then for a bigger drop sees wild swings and no clear entry point. The DCA strategy — buying at intervals no matter what — gains ground precisely for that reason: it removes the decision of timing the market.

The calendar circulating in the analyses places the sharp correction at the end of the first quarter of 2022. It's a bet, not a fact. And it's worth remembering the usual bias: we've spent a decade hearing that the S&P 500 is at all-time highs and about to crash. Someday it will.

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Spain's Ibex hasn't lifted its head since 2008, and when the S&P 500 rises, the Spanish index barely trinc; when it falls, it sinks deeper. That persistent gap says more about the real economy than any candlestick chart.