The 40% concentration rule in the economic bubble has been activated for the first time since the dot-com bubble burst.

If history repeats itself, the entire market could be at risk.
Whenever the top 10 stocks account for 40% or more of the total market, a major crash has occurred shortly afterward.
This pattern has held true for nearly 200 years of market history.
In 1929, the top 10 stocks accounted for 44% of the market. Then came the Great Crash.
In 1965, this figure reached 40%. The "Go-Go" bubble burst.
In 2000, it reached 41%. Then the dot-com bubble burst.
Today, the top 10 stocks again make up 40% of the market.
Alone, Apple, Microsoft, Amazon, NVDA, and Google account for 25%.
This level of concentration is only seen at the peaks of the biggest bubbles in history.
And each time, the entire market suffers, not just the leading stocks.
In 2000, while the Nasdaq index fell 80%, the S&P 500 still declined 50%.
In 2008, as leading banks experienced sharp declines, the S&P 500 dropped up to 58%.
When the peak becomes too heavy, it drags everything down.
The 40% concentration is a clear and consistent warning sign.
That doesn’t mean a crisis will happen tomorrow.
But it does mean that market risk levels are extremely high.