Statistics · 2026 · Stocks
Stock Market Concentration Statistics (2026)
57.2% of the combined market cap across WealthyBud’s 103-stock large-cap universe sits in its 10 biggest names — but that is WealthyBud’s own 103-stock basket, not the S&P 500. In the S&P 500, the 10 largest companies by index weight held 40.4% in State Street’s SPDR S&P 500 ETF (SPY) holdings file for October 1, 2026. A smaller basket of the same mega-caps produces higher top-N shares than the full index.
Key takeaways
- The top 10 of WealthyBud’s 103 priced large-caps hold 57.2% of the group’s combined $49.09T market cap, as of 2026-10-02.
- NVIDIA CORP (NVDA) alone accounts for 11.5% of that total — 29.7 times the median covered company’s market cap of $190.2B.
- Just 7 of WealthyBud’s 103 covered stocks combine for half of the group’s total market cap.
- Six of the seven “Magnificent Seven” names have a priced market cap in WealthyBud’s data and hold 47.0% of the covered total; Tesla, Inc. (TSLA) is not covered.
- In the S&P 500, the 10 largest companies by index weight held 40.4% in the SPY holdings file for October 1, 2026.
- The full Magnificent Seven held 34.5% of the S&P 500 by index weight in the same file.
How concentrated is WealthyBud’s covered stock universe?
The 10 largest of WealthyBud’s 103 priced large-cap stocks hold 57.2% of the group’s combined $49.09T market cap, and the single largest, NVIDIA CORP, holds 11.5% on its own. This is WealthyBud’s own 103-stock large-cap basket, not the full stock market or the S&P 500.
1. Combined market cap of WealthyBud’s 103 covered large-caps: $49.09T
All 103 tracked large-cap stocks carry a combined market capitalization of $49.09T as of 2026-10-02 (WealthyBud data · 103 large-caps · 2026-10-02).
2. NVIDIA CORP (NVDA) alone holds 11.5% of the total
NVIDIA CORP is the single largest covered company by market cap, $5.65T, representing 11.5% of the group’s combined market cap on its own (WealthyBud data · 103 large-caps · 2026-10-02).
3. Top 5 covered companies hold 43.3% of combined market cap
WealthyBud’s 5 largest covered companies by market cap together account for 43.3% of the full basket’s combined $49.09T (WealthyBud data · 103 large-caps · 2026-10-02).
4. Top 10 covered companies hold 57.2%
Widening to the 10 largest covered companies raises the share to 57.2% of combined market cap — a jump of 14.0 points from the top 5 alone (WealthyBud data · 103 large-caps · 2026-10-02).
5. Top 20 covered companies hold 69.1%
The 20 largest covered companies combine for 69.1% of total market cap, meaning the other 83 priced companies WealthyBud tracks share the remaining 30.9% (WealthyBud data · 103 large-caps · 2026-10-02).
Which stocks make up the top 10 by market cap?
WealthyBud’s top 10 by market cap span 4 GICS sectors: Information Technology (6), Communication Services (2), Consumer Discretionary (1), Health Care (1). The 10 combined hold 57.2% of the covered universe’s total market cap, as of 2026-10-02.
| Rank | Ticker | Company | Market cap | Share of covered total |
|---|---|---|---|---|
| 1 | NVDA | NVIDIA CORP | $5.65T | 11.52% |
| 2 | AAPL | Apple Inc. | $4.86T | 9.90% |
| 3 | GOOGL | Alphabet Inc. | $4.20T | 8.55% |
| 4 | MSFT | MICROSOFT CORPORATION | $3.82T | 7.79% |
| 5 | AMZN | AMAZON COM INC | $2.70T | 5.50% |
| 6 | META | Meta Platforms, Inc. | $1.86T | 3.78% |
| 7 | AVGO | Broadcom Inc. | $1.69T | 3.45% |
| 8 | MU | Micron Technology, Inc. | $1.21T | 2.47% |
| 9 | LLY | ELI LILLY AND COMPANY | $1.08T | 2.19% |
| 10 | AMD | ADVANCED MICRO DEVICES INC | $1.03T | 2.10% |
6. It takes only 7 of the 103 covered stocks to reach half the group’s market cap
Ranking WealthyBud’s covered stocks from largest to smallest, the 7 biggest combine for at least half of the $49.09T total — the remaining 96 priced stocks share the other half (WealthyBud data · 103 large-caps · 2026-10-02).
7. NVIDIA CORP is 29.7 times the median covered company’s market cap
The median market cap among WealthyBud’s 103 priced stocks is $190.2B, versus $5.65T for NVIDIA CORP alone — a 29.7x gap between the largest company and the typical one (WealthyBud data · 103 large-caps · 2026-10-02).
All 103 tracked companies carry a priced market cap, so none is excluded from the figures above; a company with several share classes counts the market value of all of them (WealthyBud data · 2026-10-02).
How much of the S&P 500 sits in its top 10 stocks?
In State Street’s SPDR S&P 500 ETF (SPY) holdings file for October 1, 2026, the 10 largest companies held 40.4% of the S&P 500 by index weight, with Alphabet Inc. (GOOGL/GOOG) counted as one company across share classes. That is 16.8 points below WealthyBud’s own top-10 share. 7 of those 10 companies are Magnificent Seven members.
| Rank | Ticker | Company | Index weight |
|---|---|---|---|
| 1 | NVDA | NVIDIA CORP | 8.45% |
| 2 | AAPL | Apple Inc. | 7.30% |
| 3 | MSFT | MICROSOFT CORPORATION | 5.76% |
| 4 | GOOGL | Alphabet Inc. | 5.41% |
| 5 | AMZN | AMAZON COM INC | 3.69% |
| 6 | AVGO | Broadcom Inc. | 2.47% |
| 7 | META | Meta Platforms, Inc. | 2.42% |
| 8 | MU | Micron Technology, Inc. | 1.88% |
| 9 | AMD | ADVANCED MICRO DEVICES INC | 1.52% |
| 10 | TSLA | Tesla, Inc. | 1.51% |
8. S&P 500 top-10 weight (October 1, 2026): 40.4%
The 10 largest company weights in the SPY daily holdings file sum to 40.42% as of October 1, 2026 (WealthyBud data · 501 index companies, fund weights used as index weights).
9. NVIDIA CORP and Apple Inc. held 15.75% of the S&P 500 on October 1, 2026
NVIDIA CORP carried 8.45% and Apple Inc. carried 7.30% of index weight in the SPY holdings file for October 1, 2026 — the two largest S&P 500 weights combined for 15.75% (WealthyBud data · 501 index companies).
10. WealthyBud’s top-10 share (57.2%) is above the S&P 500’s (40.4% as of October 1, 2026)
The gap is 16.8 points. The two figures differ in pool (103 priced large-caps versus 501 index companies), in method (market-cap shares versus fund weights) and in date (2026-10-02 prices versus the October 1, 2026 holdings file) (WealthyBud data).
Screen all 103 covered stocks by market cap, valuation and Investor Score
How big is the “Magnificent Seven” in each dataset?
The “Magnificent Seven” — Nvidia, Apple, Microsoft, Amazon, Alphabet, Meta and Tesla — are a media label for seven mega-cap stocks, not an index. 6 have a priced market cap in WealthyBud’s dataset and hold 47.0% of its covered total. In the S&P 500, all seven held 34.5% by index weight in the SPY holdings file for October 1, 2026.
11. 6 of the Magnificent Seven hold 47.0% of WealthyBud’s covered total
NVDA, AAPL, GOOGL, MSFT, AMZN, META are the Magnificent Seven names with a priced market cap in WealthyBud’s dataset; together they carry $23.09T, or 47.0% of the $49.09T covered total (WealthyBud data · 2026-10-02).
12. All 6 tracked Magnificent Seven names carry a priced market cap
NVDA, MSFT, GOOGL, META, AAPL, AMZN each have a market cap in WealthyBud’s data, so none is excluded from the figures above; multi-class companies such as Alphabet count all share classes (WealthyBud data · 2026-10-02).
13. Tesla, Inc. (TSLA) is not among WealthyBud’s 103 covered large-caps
Tesla, Inc. (TSLA) is part of the commonly cited Magnificent Seven but is not among the 103 companies WealthyBud tracks, so it contributes nothing to WealthyBud’s basket figures; the index-weight figures include all seven.
14. Magnificent Seven share of the S&P 500 (October 1, 2026): 34.5%
All seven — with Alphabet’s two share classes counted as one company — held a combined 34.54% of index weight in the SPY holdings file for October 1, 2026, the figure WealthyBud’s Magnificent Seven statistics also use.
15. WealthyBud’s 6 priced Magnificent Seven names (47.0%) outweigh the full seven’s S&P 500 weight (34.5% as of October 1, 2026)
6 of the 7 names hold a bigger share of WealthyBud’s basket (47.0%) than all 7 hold of the S&P 500 by index weight (34.5%). The pools, methods and dates differ, as for the top-10 comparison above.
- NVIDIA CORP (NVDA) carries a market cap of $5.65T, 11.5% of the covered total.
- Apple Inc. (AAPL) carries a market cap of $4.86T, 9.9% of the covered total.
- Alphabet Inc. (GOOGL) carries a market cap of $4.20T, 8.5% of the covered total.
- MICROSOFT CORPORATION (MSFT) carries a market cap of $3.82T, 7.8% of the covered total.
- AMAZON COM INC (AMZN) carries a market cap of $2.70T, 5.5% of the covered total.
- Meta Platforms, Inc. (META) carries a market cap of $1.86T, 3.8% of the covered total.
What this means for investors
WealthyBud’s concentration numbers are not S&P 500 numbers. WealthyBud tracks 103 large-caps, not the 500 in the S&P 500, so its top-10 share is above the index figure — 57.2% versus 40.4% on October 1, 2026.
The index is concentrated too. The Magnificent Seven alone held 34.5% of the S&P 500 by index weight on October 1, 2026, and all seven are among its 10 largest companies.
Share-class handling changes any concentration count. WealthyBud adds every share class of a company into one market cap and one index weight, while SPY’s holdings list Alphabet’s Class A and Class C shares as separate lines; compare like with like before setting one source against another.
For diversification-minded investors, a market-cap-weighted basket — WealthyBud’s 103 stocks or the S&P 500 itself — concentrates risk in whichever handful of companies investors have bid up the most.
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