S&P 500 Hits Record as Top 10 Stocks Hold Nearly Twice the Weight of 402 Firms

• The S&P 500 hits a record as the Top 10 stocks and Big Tech stocks, led by Nvidia, account for nearly 40% of the index, highlighting rising market concentration
• Nvidia carries the largest individual weight in the index at about 8.46%, giving its performance a significant impact on the broader market
• The growing concentration means moves in a small group of mega-cap companies can have a bigger effect on the S&P 500

The S&P 500 has now hit a new record, a milestone by closing on the 7818.93 level. The index gained 0.58% on October 6, as technology stocks, particularly the AI stocks, continue to support the index and broader market momentum. The new high further indicates how influential tech stocks have become in contributing to the S&P 500 index’s growth as of late. The top 10 companies are now contributing heavily to its surge, outlining the stark market concentration by covering nearly 40% of the S&P 500 weight.

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Big Tech Stocks Cover A Giant Part Of The S&P 500

Nearly 40% of the S&P 500 index is made up of its 10 largest companies, which continue to contribute heavily to the index. In essence, this development has been explained in a recent post by the Kobiessi letter. The KL post says that the market concentration has shrunk as diversification on the S&P 500 continues to decline.

The index now comprises Nvidia with the largest weight of 8.46%, followed by Apple at 7.30%. Microsoft is standing at 5.77%, with Alphabet’s two share classes accounting for 5.42% combined. Amazon also has nearly 3.69% weight on the S&P 500 index.

The KL post outlines the same narrative, adding how every $1 invested in the S&P 500, nearly 41 cents goes to the 10 largest stocks first.

“Diversification is dying. For every $1 invested in the S&P 500, ~41 cents now goes to just the 10 largest stocks. Nvidia, $NVDA, alone accounts for 8 cents, followed by Apple, $AAPL, at 7 cents, Microsoft, $MSFT, and Alphabet, $GOOGL, at 6 cents each, and Amazon, $AMZN, at 4 cents. The next 5 mega-cap names, Broadcom, $AVGO, Meta, $META, Tesla, $TSLA, Micron, $MU, and AMD, $AMD, represent another 10 cents combined. By comparison, the next 10 largest firms account for just 10 cents combined. The top 10 stocks now represent almost 2x the allocation of 402 other companies in the index, which together account for just 23 cents of every $1. Big Tech effectively is the market.”

Broadcom, Meta, Micron, AMD, and Tesla are also adding to the index weight. The largest companies collectively account for roughly 40% of the S&P 500.

This roughly entails how the index core anatomy is made up of a handful of large companies, impacting its surge and spikes as of late.

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Nvidia Leads The Index

Nvidia has become one of the most important companies for the index. The company’s size and role in the AI infrastructure arena are helping shape up the index by contributing nearly 8% of the S&P 500 index.

This concentration, however, does not mean that the rest of the market is falling. Rather, it simply signals how the market-weighted S&P 500 gives much more influence to the largest companies.

At the same time, this further highlights a concentration issue, as KL earlier outlined. This level of market concentration would also mean that these handful of companies have the power to sway the index. The index diversification is closing in hard and fast.

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