5 key investing lessons from recent AI-market mania


AI Hand holding crystal ball.
Getty Images; Jenny Chang-Rodriguez/BI
  • China’s DeepSeek Al shocked Wall Street this week, sparking a large decline in Nvidia and other tech stocks.

  • The episode highlights the dangers of market concentration and impacts everything from bonds to crypto.

  • Here are five lessons for investors to take away from the DeepSeek-fueled crash.

A new AI model from China rattled US markets this past week.

DeepSeek represented a breakthrough for the AI industry, delivering results on par with OpenAI’s best model while using significantly less computing power.

The implications have been substantial. Nvidia stock shed nearly $600 billion in market value in a single day as investors worried about future demand for its GPU chips, which are the main fuel source for large language models.

Suppose large language models from OpenAI, Anthropic, and Meta adopt some of the techniques utilized by the open-sourced DeepSeek and become more efficient. Will they need as much computing power as initially thought?

On the flip side, AI adopters, particularly software companies, surged on the prospect that the cost of AI technologies would decrease significantly, leading to higher profit margins.

But there are even broader lessons investors can take from this week’s black swan event, and they impact everything from bonds to stocks and even crypto.

The concentration of a handful of mega-cap tech companies dominating the stock market has crept up to historic levels over the past few years.

According to Goldman Sachs data, the top five stocks in the S&P 500 made up about 29% of the index as of December 31, and they’re all highly exposed to similar technology trends.

“Concentration in several large names is a concern when the drivers of success are the same for most of the names,” Chris Fasciano, chief market strategist at Commonwealth Financial Network, told Business Insider.

Concentration is a double-edged sword. It can work great in bull markets, but a simple disruption to investors’ overarching narrative could lead to a painful decline, as seen on Monday, when the index tracking mega-cap tech stocks plunged 3%, compared to a slight gain for the equal-weighted S&P 500.

The concentration speaks to the idea that investors may not be as diversified as they believe.

“This is an underappreciated consideration,” Steve Sosnick, chief strategist at Interactive Brokers, told BI.

“It is common — and understandable — for investors to believe that they are adequately diversified when they buy an S&P 500-linked fund,” Sosnick said, but that’s not the case based on the extreme concentration levels.


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