On November 10, 2026, NVIDIA was 6.30% of the S&P 500, the second-largest company in the index after Apple (7.84%). Put $100 into an S&P 500 index fund and $6.30 of it goes to NVIDIA — more than the index's 209 smallest companies combined, and about 90 times the weight of the median member.
Six weeks earlier, on September 24, the same file put NVIDIA at 8.19% and in first place. The index rules did not change in between; NVIDIA's share price fell faster than the rest of the market. That swing is the point of this guide: a company's weight in your fund is its price, and it moves every trading day.
That is not a flaw in your fund. It is what market-cap weighting does when a handful of companies become the most valuable in the world. But it changes what "I own the whole market" means, and it changes it again the moment you add a Nasdaq fund or a few NVIDIA shares of your own.
This guide works from the full daily holdings file of the SPDR S&P 500 ETF (SPY), all 503 stocks, and answers three questions: how big NVIDIA and the chip trade really are inside the index, what a sharp NVIDIA drop would do to it, and how much NVIDIA your own portfolio holds once funds and shares are added together.
The snapshotOne company, one-sixteenth of the index
The top ten names hold 37.1% of the index; the other 493 companies share the remaining 62.9%.
Show these figures as a table
| Value (% of the S&P 500) | |
|---|---|
| Apple — 7.84% | 7.84 |
| NVIDIA — 6.30% | 6.3 |
| Microsoft — 6.10% | 6.1 |
| Amazon — 4.10% | 4.1 |
| Alphabet A — 2.60% | 2.6 |
| Broadcom — 2.43% | 2.43 |
| Meta — 2.18% | 2.18 |
| Alphabet C — 2.09% | 2.09 |
| Eli Lilly — 1.77% | 1.77 |
| Berkshire Hathaway — 1.67% | 1.67 |
Source: CalculatorAI · calculatorai.app · State Street SPY daily holdings, as of 2026-11-10 · drafts/nvidia-sp500-weight-numbers.mjs
Three numbers put the 6.30% in context:
- The top three are 20.2%. Apple, NVIDIA and Microsoft together are more than a fifth of an index that is meant to represent the whole U.S. large-cap market.
- The median company is 0.070%. Half of the S&P 500's members each weigh less than that. For most of the 500, a 50% crash would move the index by three hundredths of a percent.
- The weight moves fast. Vanguard's June 30 fact sheet for VOO — the same index — put NVIDIA at 7.5%. On September 24 it was 8.19% (the figure in our framework for choosing ETFs in 2026); on November 10, 6.30%. NVIDIA's share of the fund fell by almost two points in six weeks without the fund selling a single NVIDIA share.
The shock mathWhat an NVIDIA drop does to the index
The effect of a single stock on the index is its weight times its move. Nothing more complicated is needed to see the exposure:
stock weight × stock returnold weight × (1 + return) ÷ (1 + index return)Σ (fund share of your portfolio × company weight in fund) + shares you own directlyIf NVIDIA fell 30% in a day and every other stock stood still, the S&P 500 would fall 1.89% — the size of one of the S&P 500's worse days in a typical year. A 50% NVIDIA fall, everything else flat, would take 3.15% off the index and leave NVIDIA at 3.25% of it. At September's 8.19% weight the same 30% fall would have cost the index 2.46%: the smaller the weight, the smaller the hit.
−20%
- S&P 500 move
- −1.26%
- NVIDIA weight after
- 5.10%
- On $100,000 in an index fund
- −$1,259
−30%
- S&P 500 move
- −1.89%
- NVIDIA weight after
- 4.49%
- On $100,000 in an index fund
- −$1,889
−50%
- S&P 500 move
- −3.15%
- NVIDIA weight after
- 3.25%
- On $100,000 in an index fund
- −$3,149
| NVIDIA move | S&P 500 move | NVIDIA weight after | On $100,000 in an index fund |
|---|---|---|---|
| −20% | −1.26% | 5.10% | −$1,259 |
| −30% | −1.89% | 4.49% | −$1,889 |
| −50% | −3.15% | 3.25% | −$3,149 |
Source: CalculatorAI · calculatorai.app · drafts/nvidia-sp500-weight-numbers.mjs
"Everything else flat" is the kind assumption. NVIDIA rarely falls alone. Its suppliers, its customers and the other chip makers tend to move with it, which is why the more useful question is how big the whole chip trade is.
The wider betAbout 15% of the index is chips
We identified 19 semiconductor companies in the November 10 file — chip designers, manufacturers, equipment makers and materials suppliers. Together they are 14.6% of the S&P 500, down from 18.3% on September 24. NVIDIA is 6.30%, Broadcom 2.43%, AMD 1.30%, Micron 1.26%, Applied Materials 0.46%, Intel 0.44% and Lam Research 0.43%; a dozen smaller names make up the rest.
NVIDIA falls 30%, the rest hold
The index loses 1.89%. Painful for NVIDIA holders, a routine bad day for an index fund.
All 19 chip stocks fall 30%
The index loses about 4.4% before any knock-on effect on the software and cloud companies that buy their chips. That is the scale of the AI-hardware bet inside a 'diversified' fund.
One-seventh of a broad index in one industry is exactly the kind of hidden concentration our diversification explainer warns about: it is not visible in the ticker list, only in the weights.
Why it happensMarket-cap weighting has no ceiling
The S&P 500 weights each company by the market value of the shares available to the public. The index committee decides who is in; the market decides how much each one counts. When NVIDIA's value grows faster than the market's, its weight grows with it, and the index has no single-stock cap that trims it back.
That is also the case for the method. An index fund never has to guess which company will lead. It held NVIDIA at little more than 1% of the index at the end of 2022 and grew the position automatically, at almost no trading cost. The same rule will shrink the position automatically if the market re-rates it. What cap weighting does not do is protect you from the leader's reversal while it is the leader.
The alternative exists: an equal-weight S&P 500 fund gives each of the roughly 500 members about 0.2%, so NVIDIA would count for about 0.2% instead of 6.30%. It is a different bet — more mid-sized companies, more turnover, usually higher fees — not a free fix.
Your NVIDIAAdding QQQ moves it a little, shares move it a lot
Here is where most investors get the number wrong. The Nasdaq-100 feels like "more tech", so it is easy to assume that adding QQQ doubles up on NVIDIA. It does not: on November 9 NVIDIA was 7.10% of QQQ against 6.30% of the S&P 500, and on September 24 the two were level (8.17% and 8.19%). Nasdaq-100 rules limit how much weight its largest members can hold together, so the leaders are trimmed and the next tier — AMD at 3.78% and Micron at 3.77% — gets far more room than in the S&P 500. The same effect shows up in our VOO vs QQQ overlap analysis.
100% S&P 500
- NVIDIA exposure
- 6.30% · $6,297
- Micron + AMD
- 2.56%
- Loss if NVIDIA falls 30%
- −$1,889
70% S&P 500 + 30% QQQ
- NVIDIA exposure
- 6.54% · $6,538
- Micron + AMD
- 4.05%
- Loss if NVIDIA falls 30%
- −$1,961
60% S&P 500 + 25% QQQ + 15% NVDA shares
- NVIDIA exposure
- 20.55% · $20,553
- Micron + AMD
- 3.42%
- Loss if NVIDIA falls 30%
- −$6,166
80% S&P 500 + 20% NVDA shares
- NVIDIA exposure
- 25.04% · $25,038
- Micron + AMD
- 2.05%
- Loss if NVIDIA falls 30%
- −$7,511
| Portfolio | NVIDIA exposure | Micron + AMD | Loss if NVIDIA falls 30% |
|---|---|---|---|
| 100% S&P 500 | 6.30% · $6,297 | 2.56% | −$1,889 |
| 70% S&P 500 + 30% QQQ | 6.54% · $6,538 | 4.05% | −$1,961 |
| 60% S&P 500 + 25% QQQ + 15% NVDA shares | 20.55% · $20,553 | 3.42% | −$6,166 |
| 80% S&P 500 + 20% NVDA shares | 25.04% · $25,038 | 2.05% | −$7,511 |
Source: CalculatorAI · calculatorai.app · drafts/nvidia-sp500-weight-numbers.mjs
Two lessons from the table:
- Funds change the chip mix far more than the NVIDIA number. Moving 30% into QQQ raised NVIDIA exposure by a quarter of a point (6.30% to 6.54%) and Micron plus AMD by half (2.56% to 4.05%). You bought mostly more of the rest of the semiconductor trade.
- Direct shares dominate everything. A 20% slice in NVIDIA stock on top of an index fund puts 25.04% of the portfolio in one company, because the index fund already holds 6.30% of it. The investor thinks "20% NVIDIA"; the true figure is a quarter of the money.
The general method — look through every fund, then add direct shares — is the audit in our ETF overlap guide. Doing it once a quarter is usually enough — but as September to November showed, a leader can move two points of the index in six weeks.
What to doDecide the exposure on purpose
None of this says NVIDIA is overvalued or that you should sell. The chip selloff of November 5, 2026 shows how this concentration feels on a bad day. It says the exposure is larger than most portfolios' labels suggest, and that it should be a decision rather than an accident.
Write down a company cap
Pick the most you would hold in any one company across all accounts — 10%, 15%, 25%. Any number works; an unwritten one does not.
Count through the funds
Multiply each fund's share of your portfolio by the company's weight in that fund, then add directly owned shares. Use the fund's own daily holdings file, not last year's article.
Check the industry, not only the name
Add up the chip makers too. About 15% of the S&P 500 is semiconductors; a Nasdaq fund or a tech ETF raises that further.
Rebalance with new money first
Direct new contributions and dividends to the underweight parts before selling a winner in a taxable account. Selling realises a gain; redirecting cash does not.
Re-check after big moves
A 30% move in a top holding changes its weight by more than a quarter. Look again after a quarter like that, not on a fixed date only.
The Portfolio Tracker shows each holding's share of your total portfolio across accounts, including a direct NVIDIA position, so the direct part of the sum above is always current; the Asset Allocation Calculator helps set the target weights you rebalance toward.
Frequently asked questions
What percentage of the S&P 500 is NVIDIA?
6.30% on November 10, 2026, according to the SPY daily holdings file. It is the second-largest company in the index, after Apple at 7.84% and ahead of Microsoft at 6.10%. On September 24 it was 8.19% and in first place: the weight changes every trading day with the share price.
Is the S&P 500 too concentrated?
It is more concentrated than at most points in its history: the top ten companies hold 37.1% of the index. Whether that is "too much" depends on your other holdings. For a portfolio that already holds individual tech stocks, the overlap is the real risk, not the index itself.
Does QQQ have more NVIDIA than VOO?
Slightly. On November 9, 2026 NVIDIA was 7.10% of QQQ against 6.30% of the S&P 500 (on September 24 the two were level). QQQ holds far more Micron and AMD, so it adds much more chip exposure than NVIDIA exposure.
How much would the S&P 500 fall if NVIDIA crashed?
Its weight times its fall. With everything else unchanged, a 30% NVIDIA drop takes about 1.89% off the index and a 50% drop about 3.15%. In practice other chip and AI stocks usually fall with it, so the real move would likely be larger.
Should I sell my index fund because of NVIDIA?
Concentration is a reason to measure your total exposure, not by itself a reason to sell. Our AI bubble guide replays a 2000-style fall on sample portfolios. A brand-new mega-listing raises the same question from the other side — our look at whether to buy the Anthropic IPO on day one shows how index funds pick up a new stock and how to size a direct position on top. If the total is above the cap you would choose deliberately, redirecting new money is usually cheaper than selling, especially in a taxable account.
Sources and methodology
Index weights are from State Street's daily holdings file for the SPDR S&P 500 ETF Trust (SPY), dated November 10, 2026: 503 stocks after removing the cash line and a legacy rights entry (the September 24 file, used in the first version of this guide, supplied the 8.19% comparison). QQQ weights for NVIDIA, Micron, AMD, Apple and Microsoft are from the holdings of November 9, 2026 as published on stockanalysis.com. Vanguard's VOO fact sheet dated June 30, 2026 supplied the 7.5% comparison. All arithmetic — top-N sums, the smallest-companies count, shock scenarios and portfolio look-through — is reproduced in drafts/nvidia-sp500-weight-numbers.mjs.
The 19 semiconductor companies were identified by ticker, because the holdings file does not carry a sector field; including or excluding a borderline name such as a chip-design software company moves the 14.6% by a few tenths. Shock scenarios hold every other stock still, which understates a real sell-off: correlated names usually fall together. Educational information only, not personalised investment or tax advice.
