Key Takeaways:
Technology, media, and telecom stocks now control nearly half the S&P 500 — a concentration unseen in market history.
The S&P 500's technology weighting has reached 9 percentage points above the dot-com bubble peak, with TMT companies now controlling nearly half the index's total market capitalization.
"The index is effectively a tech proxy wearing a broad-market label, and that creates a diversification problem most passive investors don't realize they have," said Priya Mehta, equity market structure analyst at Edgen.
Information Technology alone accounts for roughly 35% to 38% of the S&P 500, while Communication Services contributes another 10% to 11%. Including Amazon and Tesla — classified in Consumer Discretionary but deeply tied to the digital economy — pushes the effective tech exposure even higher. The concentration sits about 20 percentage points above levels seen during the late 1960s.
The risk is not that tech companies are overvalued in isolation — it is that a correction in a handful of AI-driven mega-caps could now move the entire S&P 500 far more dramatically than similar pullbacks would have in prior decades. The S&P 500 fell 1% on July 17, led by technology and semiconductor names, as profit-taking and valuation reassessment weighed on the sector, according to Seeking Alpha data.
CapEx Surge Creates a Divergence
Tech sector capital expenditures have surged nearly 876% since 2019, compared with only 62% growth across the rest of the index, as companies pour money into data centers, advanced chips, and AI infrastructure. Deutsche Bank Research analysts Luke Templeman and Galina Pozdnyakova noted in a June report that the spending spree is expected to pressure free cash flow at Alphabet, Amazon, Apple, Meta Platforms, and Microsoft through 2028 as asset efficiency declines.
The divergence extends beyond spending. Non-tech S&P 500 companies are projected to deliver approximately 13.2% earnings per share growth in 2026, ahead of forecasts for Europe and Japan, while technology leads at roughly 23.7%. Many traditional companies have spent recent years strengthening balance sheets — cash holdings have grown at roughly 8% annually since 2019, outpacing inflation, while net borrowing has remained limited.
Valuation Gap Opens Opportunity
Equal-weighted S&P 500 funds such as the Invesco S&P 500 Equal Weight ETF trade at a significant discount compared with the traditional market-cap-weighted index, reflecting the valuation gap between mega-cap tech and the rest of the market. Non-tech companies remain far cheaper than the Nasdaq-100 on a forward earnings basis, according to Deutsche Bank.
Energy and Real Estate sectors have outperformed in recent sessions as investors rotate away from technology, while Technology and Consumer Discretionary have lagged, data from the week ending July 17 show. The rotation suggests some market participants are already positioning for a broadening of the rally beyond AI winners.
For investors, the lesson is not to abandon technology — AI could remain one of the most important growth trends of the decade. Instead, the structural shift may warrant balancing exposure through equal-weighted funds or selectively adding high-quality companies outside the tech sector. The S&P 500 may currently look like a tech index in disguise, but underneath the surface is a broader market that could be waiting for its turn.
This article is for informational purposes only and does not constitute investment advice.
