How Much Nvidia Do You Really Own

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How much Nvidia do you really own? For most people the honest answer is "I'm not sure," and that's fine, because it takes about ten minutes to find out. We'll walk through the arithmetic, fund by fund, with a worked example. Then we'll widen it to the bigger number: how much of your money rides on the AI spending boom as a whole, and what band you'd want to keep it in. If you came here asking whether Nvidia can bounce 20% in a month, we took that seriously in will Nvidia stock jump 20% in the next 30 days?

"You probably own more of the hot stock than you think. Your index fund owns it too." - Anonymous

What Does Everyone Already Know?

That index funds are diversified. An S&P 500 fund owns about 500 companies, so no single one should matter much. That used to be close to true. Today the ten biggest holdings are 37.5% of SPY. Here are the seven biggest, and what each did on Thursday:

Weights from State Street's SPY holdings as of Nov 4 (Alphabet = GOOGL 2.56% + GOOG 2.06%); P/E at Thursday's close; Thursday is day close vs prior close.

So when Nvidia fell about 9% on Thursday, it alone knocked roughly 0.7 points off the S&P 500 fund, about a sixth of its 4.4% fall. Your "diversified" fund was partly an Nvidia fund that day. The reason the chip names fell hardest is the AI trade unwinding: the power bottleneck and growing opposition to new data centers, which we flagged on Nov 2 in "Nvidia Stock's Real Risk Isn't China. It's Power." A Wall Street Journal article argued on Thursday that the backlash could play into the hands of Big Tech.

So, How Much Nvidia Do You Own?

Here's the formula. Take each fund you own, multiply its dollar value by its Nvidia weight, add any Nvidia shares you hold directly, and divide by your total portfolio.

• S&P 500 fund (SPY, VOO, IVV): Nvidia is 7.30% of SPY. Other S&P 500 funds hold nearly the same weights.
• Nasdaq-100 fund (QQQ): Nvidia's weight is a bit higher than in the S&P 500, about 8% in early November.
• Chip funds (SMH, SOXX): Nvidia was about 20% of SMH in late October and about 8% of SOXX on Nov 4. Chip funds took in a lot of money this past month: SOXX $6.1 billion, SMH $3.68 billion.
• Total-market and growth funds: the weight varies by fund, so check yours.

What Does That Look Like For A $5 Million Portfolio?

An illustrative example, not anyone's real account. Say you have $5 million: 60% in an S&P 500 fund, 5% in Nvidia shares you bought yourself, and the other 35% in bonds, cash and funds with no Nvidia.

You think of it as a 5% Nvidia position. It's nearly double that.

What does 9.4% mean in dollars? Thursday's fall cost this portfolio about $43,000 through Nvidia alone. A 2022-size fall, when Nvidia lost two-thirds of its value, would take about 6.2% off the whole portfolio, roughly $311,000. The question is whether that swing fits the plan you have for this money.

What's The Bigger Number?

Nvidia is one stock. The bet behind it is bigger: that the largest tech companies keep spending heavily on AI data centers. Nvidia and Broadcom sell the chips; Microsoft, Alphabet, Amazon and Meta are the biggest buyers. Add those six weights from the table and you get about 26.5% of SPY. On Thursday those six did about 1.4 points of SPY's 4.4-point fall, close to a third of it.

Here's where the numbers get interesting. The sellers and the buyers look very different underneath:

Past 12 reported months. Nvidia alone produced more free cash than the four buyers combined.

That's the connection worth seeing. Alphabet sells about $471 billion a year and kept only about 4 cents of each dollar as free cash; Amazon spent $47 billion more than it brought in. Much of that cash is going into data centers, and a big share of it lands at Nvidia: the four buyers have said they'll spend about $730 billion on capital projects in 2026. So the six aren't six separate bets. If the buyers slow their spending, the sellers' sales slow; if they keep spending, their own cash stays thin. Either way, all six feel it.

How Far Have These Fallen Before?

The last time the AI-and-tech trade cracked was 2022. Here's how far each fell from peak to bottom, and when it got back:

Every one of the six fell further than the fund that holds them, and every one came back.

That's the shape of concentrated exposure: deeper falls and, so far, full recoveries, sometimes within months, sometimes more than a year. We put the same question to the whole AI chain, from chips to power, in How Much AI Do You Really Own?

What Band Should Your AI Exposure Sit In?

There's no single right number. What matters is that you pick one before the market picks it for you.

1. Start from the market's own weight. If you simply own the S&P 500, you have about 26.5% in these six, and about 7.3% in Nvidia. That's "neutral." Anything above it is a bet you chose; anything below it is a bet against.

2. Pick a band around it. For example: total Nvidia between 5% and 10%, and the six together between 20% and 30%. If you're inside the band, do nothing. If you're above it, trim back toward the middle. Below it and you believe in the build-out, add in pieces.

3. Check it on a calendar, not a headline. Once a quarter is plenty, plus once before a big dated event. Nvidia's next report is listed for Nov 17.

In our $5 million example, the six come to about $795,000 inside the index fund plus the $250,000 of Nvidia shares: about $1.05 million, or 21% of the portfolio. That's inside both bands, near the top for Nvidia. Adding another 5% of Nvidia on the dip would push it to about 14.4%, well above the band, and that's worth knowing before you click buy.

What Can Lower Your AI Exposure Without Leaving The Market?

Selling isn't the only tool. You can move part of your stock money into stocks that don't depend on the AI build-out. One example is the Trefis Income Solution: 50 dividend stocks weighted by size, at most 5% each, each with 10 straight years of dividends and a yield in the top half. None of the six AI names is among its 50 holdings. Its yield today is about 3.0%, roughly three times the S&P 500's. On Thursday its 50 holdings fell 1.5% while the S&P 500 fell 4.4%, and in 2022 it gained 2.9% while the S&P 500 lost 18.2% (model, before fees).

It gives something up. From March 2017 to October 2026 it returned 12.9% a year against 14.6% for the S&P 500, and it trailed in 6 of 10 calendar years, including 2023: +1.4% against +26.2%. That's the trade: less of the AI boom on the way up, less of the fall on the way down.

In our example, moving 10% of the portfolio ($500,000) from the S&P 500 fund into a mix like this would bring Nvidia from 9.4% to about 8.7% and the six from 21% to about 18%.

Find your number, then pick your band. Nvidia is 7.30% of SPY and the six AI names about 26.5%; on Thursday they did about a third of the fund's fall. Nvidia produced $127 billion of free cash in the past year while Amazon's was negative: the buyers' spending is the sellers' sales. In our illustrative $5 million portfolio, 60% in an S&P 500 fund plus 5% in Nvidia shares means about 9.4% in Nvidia and 21% in the AI build-out. Add up yours this weekend, choose a band, say 5-10% for Nvidia and 20-30% for the six, and rebalance when you drift outside it.

What Should You Ask Next?

Follow this story with us: we'll update the weights after Nvidia's report and come back to how the band would have done.

Do You Know What You Really Own?

Hidden exposure is the risk you don't see until a day like Thursday. If you have $1 million or more invested, get a second opinion from a Trefis expert partner advisor in a free 15-minute call, or let Invest With Trefis build and run the plan for you.

For questions about this article or underlying research, email [email protected].