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Hi Investor,
Halfway through FY27, small caps are up 24.6%, mid caps 12.5% — while the Nifty 50 has managed just 1.3%. A gap this wide has happened only 6 times in 21 years, and 4 of the last 5 times, it marked the start of a big rally.
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AI Is Taking Over the US Stock Market
Something very unusual is happening in the US stock market. The AI boom is now becoming so large that a small group of AI-related companies controls a huge part of the market. The top 10 companies, including the big AI stocks along with Broadcom, AMD and Micron, now make up around 41% of the total US market value.

This level of concentration is starting to look similar to some of the biggest market bubbles seen in history.
History Shows a Warning
The current 41% concentration is not completely new. The biggest concentration in history happened in the railroads during the 1800s, when they reached around 63% of the market. Japan reached about 44% in the 1980s. The dot-com boom reached around 41%, while the Nifty 50 craze of the 1970s also went close to 40%. Even the bubble of the 1920s reached about 36%. This shows that when one theme becomes too large, the market can enter a very important zone.
AI Has Entered the Danger Zone
The AI theme is now also at around 41% of the US market. This does not mean that the AI boom has to end right away. It can still go higher. The share could even rise to 60% or 70%. Nobody knows how far it can go. But history shows that many big market bubbles have reached their peak when one sector or theme controls roughly 40% to 60% of the market. That is why the current level deserves attention.
Investors Need to Be Careful
For investors who are heavily invested in US AI stocks, some caution may now be needed. The AI story can continue to grow, but the risk is also getting bigger as more and more of the market depends on the same group of companies. When such a large part of the market is tied to one theme, even a change in confidence can have a big effect on the overall market.
India Could Benefit
There could also be an interesting effect outside the US. If the AI boom loses some of its strength and investors become less confident about AI stocks, India could become a major beneficiary. India has been losing out compared with the strong performance of AI-related stocks. If money starts moving away from AI, some of that global money could move towards India instead. This could create an “anti-AI” trade where India benefits as investors look for other markets.
The Big Question Ahead
The important point is not that AI must crash. The AI story can continue for much longer and the market can become even more concentrated. But with AI stocks already making up around 41% of the US market, investors are entering a zone where history gives a reason to be careful. If confidence in AI stays strong, the rally may continue. But if that confidence changes, India could be one of the markets that benefits the most.
