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S&P 500 tech weighting climbs to 35% as big‑tech stocks drive 85% of recent gains; equal‑weight ETF offers lower P/E and diversification.
The S&P 500’s tech weighting has risen to 35%, meaning a traditional cap‑weighted ETF now places a large bet on a handful of megacap names such as Nvidia, Apple and Microsoft【1】. This concentration has sparked a surge in interest for the equal‑weight version, which trades up 0.6% while the cap‑weighted index slipped 0.1% on the same day【2】.
| At a glance | |
|---|---|
| Tech weight in S&P 500 | 35% (up from prior months)【1】 |
| Big‑Tech contribution to S&P advance (May) | 85% of gain【2】 |
| Equal‑weight ETF (RSP) price move | +0.6% on Monday【2】 |
| Forward P/E of RSP | 17, about 15% lower than cap‑weighted S&P【1】 |
The surge in AI‑related earnings and a strong first‑quarter earnings season have propelled the “Magnificent Seven” and other semiconductor names to dominate the index. Data shows the bottom 480 stocks in the S&P 500 collectively lost market value this year through mid‑May, while the top gainers—led by Alphabet, Nvidia and Apple—added the bulk of the index’s rise【2】. The divergence between index direction and breadth is at a record pace not seen since 1928, according to market‑breadth charts cited by analysts【2】.
The Invesco S&P 500 Equal‑Weight ETF (RSP) holds the same 500 constituents but gives each an equal share, reducing tech’s sector weight to 16% and balancing exposure across industrials, financials and healthcare【1】. Its forward P/E of 17 is roughly 15% cheaper than the cap‑weighted S&P, offering a modest valuation edge【1】. The macro backdrop—ongoing geopolitical tension, sticky inflation that could push rates to 4%, and a labor market showing signs of stagnation—adds weight to a defensive tilt, according to the same source【1】.
The growing tech concentration means a traditional S&P 500 ETF is increasingly a bet on a few megacap stocks, while the equal‑weight alternative offers a lower‑priced, more balanced exposure. Whether investors shift toward diversification will hinge on upcoming inflation numbers and the Fed’s rate path.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 3 outlets · Jun 23, 2026 · How we report
The current top 10 concentration of approximately 40% exceeds the 27% concentration observed during the dot-com bubble of 2000.
Equal-weight S&P 500 strategies, such as the Invesco S&P 500 Equal Weight ETF (RSP), allocate approximately 0.2% to each constituent to reduce concentration.
Because the current top 10 companies are closely linked by AI-related themes, a sector-specific reset could impact a large portion of the index simultaneously, unlike past periods where leaders spanned diverse industries.