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Tag Archives: market concentration

May 20, 2026

The Market Measure: In the Shadows of Giants

How has index concentration shifted historically and why might a diversified, cap-weighted benchmark like the S&P 500 already be tracking tomorrow’s market giants? S&P DJI’s Ben Vörös sits down with Tim Edwards to discuss Tim’s latest research, In the Shadows of Giants, and examine whether the dominance of a few large companies may be a signal of risk…

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Nov 25, 2024

The S&P 500 Top 20 Select Indices: A Deep Dive into Mega-Cap Performance

In the first part of this blog series, we introduced the S&P 500® Top 20 Select Indices, including their construction and relevance to the equity market. Now, let’s delve deeper into the indices’ historical performance and relative performance to other similar indices. Perhaps unsurprisingly, the S&P 500 Top 20 Select Indices all had similar cumulative…

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Nov 25, 2024

Introducing the S&P 500 Top 20 Select Indices

The S&P 500® is widely regarded as the best single gauge of U.S. large-cap equities. Among the 500 companies in the index, the largest names have drawn the most attention due to their outperformance in recent years. To address the increasing interest in mega-cap stocks in the S&P 500, S&P DJI recently launched the S&P…

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