How Much of the S&P 500 Is in the Top 10 Stocks Right Now?

"I own the S&P 500, so I'm diversified across 500 companies." True in count, less true in money. A big part of every dollar goes to a short list of names.

What people on X are asking

In August 2026 a widely followed markets newsletter reported that the top 10 US stocks account for 40% of the S&P 500's market cap, and that they also earn a record 38% of the index's profits. In May 2026 another account claimed the 10 largest stocks were a record 41% of the S&P 500, 14 points above the 2000 dot-com peak. And in July 2025 a third account put the figure at 37.3%, near a record, with Nvidia alone at 7.83%. Each was roughly right for its date; the share moves with prices every day.

What people in the thread said

• @VinceVoraAlpha replied that today's top 10 earn about 38% of profits on 40% of market value, whereas in 2000 they earned about 15% on 27%, so the concentration is "bought, not just believed". We have not verified the 2000 earnings figures; the argument is that profits, not only prices, are concentrated.
• @BlessedSilvanus pointed out that 40% of market value against 38% of earnings is a two-point premium: the concentration is mostly, but not entirely, justified by profits. That is a useful way to read the figures, if the earnings share is right.

These are community comments, summarised in our words; the data and sources below come first.

The fact-checked answer

The list, from the fund's own file. SPY is the oldest and largest S&P 500 ETF, and State Street publishes its full holdings daily. We downloaded the file dated November 9, 2026 and combined share classes so that each company counts once.

The 10 largest companies in SPY, November 9, 2026

Computed by UXS from State Street's SPY daily holdings (as of Nov 9, 2026). SPY held 504 securities and a small cash balance; counting share classes separately, the top 10 lines total 37.3%. Tap a column header to sort.

Rank	Company	Weight	Cumulative weight
1	Apple	7.86%	7.86%
2	Nvidia	6.64%	14.50%
3	Microsoft	6.21%	20.71%
4	Alphabet (Class A + C)	4.68%	25.39%
5	Amazon	4.02%	29.42%
6	Broadcom	2.33%	31.75%
7	Meta Platforms	2.17%	33.92%
8	Eli Lilly	1.73%	35.65%
9	Berkshire Hathaway	1.64%	37.30%
10	Tesla	1.64%	38.93%

Why the numbers on X differ. Three things change the headline. First, the date: the leaders' weights move daily. Second, share classes: counting Alphabet's A and C shares as two lines pushes Tesla out of the top 10 and gives 37.3% instead of 38.9%. Third, the measure: some analysts use the index's float-adjusted weights, others total market value. Kiplinger, for example, put the top 10 at 37% in late August 2026, with Micron in the list instead of Eli Lilly.

What it means for your risk. Weight translates directly into impact:

• If Apple falls 20%, an S&P 500 fund falls about 1.6% from that alone.
• If all 10 leaders fall 20% and the other 491 companies are flat, the index falls about 7.8%.
• The top 20 companies are 49.3% of the fund, so half of your money is in 4% of the names.

That is not necessarily bad: these companies are large because they earn a lot. But it means an S&P 500 fund is partly a bet on a handful of technology and communication businesses. Our page on why equal weight has lagged covers the alternative, which caps every company at about 0.2% at each rebalance.

Quick poll

Does the S&P 500's concentration change how you invest?

• No, it reflects where profits are
• I add an equal-weight or small-cap fund
• I avoid buying more tech funds on top
• I am not sure what I own

Save my answer

What each answer means

• No, it reflects where profits are: A reasonable view; weights follow market value and earnings.
• I add an equal-weight or small-cap fund: Diversifies away from the leaders, with different risks.
• I avoid buying more tech funds on top: Sensible: many tech and growth funds hold the same names.
• I am not sure what I own: Check your funds' top 10 holdings; overlaps are common.

Your answer is stored only in this browser (localStorage). UXS does not collect, count or publish votes, so no totals are shown.

Check for overlap. If you hold an S&P 500 fund plus a Nasdaq-100 fund plus a tech fund, you may own the same ten companies three times. Compare the S&P 500 and Nasdaq-100 and the total market alternative before adding more.

Decision helper

Related reading: what market cap is, what market breadth is and what a company needs to join the S&P 500.

Common mistakes

• Assuming 500 stocks means 500 equal bets.
• Stacking several funds that hold the same leaders.
• Comparing top-10 figures from different dates or methods.
• Treating concentration alone as a reason to sell everything.

FAQ

What percentage of the S&P 500 is the top 10?

About 38.9% in SPY's holdings on November 9, 2026, counting share classes together.

What is the largest stock in the S&P 500?

In the November 9, 2026 file it was Apple at 7.86%, ahead of Nvidia at 6.64%.

Is the S&P 500 more concentrated than in 2000?

Posts cite about 27% for the top 10 at the 2000 peak, well below today's level.

Why do different sources give different numbers?

Dates, share-class treatment and weighting methods all differ.

How much would the index fall if the top 10 fell 20%?

About 7.8%, if the other companies were unchanged.

Should I worry about S&P 500 concentration?

Know it and avoid doubling up through overlapping funds; it is a feature of cap weighting.