This week’s chart illustrates how the Technology and Communication Services sectors have grown to represent nearly half of the S&P 500. Today, these sectors account for approximately 48% of the index’s market capitalization and 47% of its expected earnings, both near record highs. While this level of concentration can raise concerns, the chart also demonstrates that the increase in market weight has been largely supported by a corresponding rise in earnings.
This is an important distinction from the late-1990s tech bubble, when market capitalization surged far ahead of underlying profits. In other words, many of today’s largest technology companies are not simply benefiting from investor enthusiasm, they are generating an outsized share of the market’s earnings. That does not mean these stocks are inexpensive or free of risk, but it does provide stronger fundamental support for their market leadership.
As technology continues to play an increasingly important role across the economy, sustained earnings growth will be a key factor in determining whether these companies can maintain their leadership position.