Earnings growth, a key driver of stock market performance, has been showing a concerning trend of concentration. According to a recent report by TS Lombard, earnings growth outside of technology and energy has essentially flatlined, with fewer sectors contributing to the overall earnings growth of the market. This trend raises an interesting question: why are investors selling technology stocks despite the sector’s continued growth?

To understand this phenomenon, it’s important to examine the underlying factors driving the concentration of earnings growth. One possible explanation is the increasing dominance of a few large technology companies, which have been the primary drivers of earnings growth in recent years. These companies have been able to maintain their market share and continue to grow their earnings through a combination of innovation, scale, and strategic acquisitions.

However, this concentration of earnings growth may have implications for investors. As fewer sectors contribute to the overall earnings growth of the market, the overall performance of the stock market may become more reliant on the performance of a smaller number of companies. This could lead to a higher level of volatility and risk, as the fate of the market becomes more tied to the fortunes of a smaller number of companies.

Furthermore, the concentration of earnings growth may also lead to a lack of diversification in investor portfolios. As investors increasingly focus on a smaller number of companies for earnings growth, their portfolios may become less diversified, which can increase risk and reduce potential returns.