How SpaceX entering the Nasdaq-100 affects your 401(k)
You probably didn't buy SpaceX. You didn't research it, you didn't call your broker, and you didn't think much about it the day it went public.
But if your 401(k) has any Nasdaq-100 or total market index funds in it, you may already own a slice of Elon Musk's rocket company, whether you meant to or not.
That's passive investing doing what it does. Once a company joins a major index, every fund tracking that index has to buy shares automatically.
No one made an investment decision on your behalf. The index rulebook made it for them.
How SpaceX got into your 401(k) through the Nasdaq-100
SpaceX went public on June 12 at $135 a share, and it entered the Nasdaq-100 just 15 trading days later.
That's not the usual timeline. It happened because Nasdaq quietly changed its inclusion rules in May, creating what it calls a "Fast Entry" rule that lets companies ranking among the top 40 by market cap skip the typical waiting period. SpaceX was the first company ever to use it, as TheStreet reported.
Related: A SpaceX Nasdaq fast-track just left S&P 500 flat-footed
The moment it joined, every fund tracking the Nasdaq-100 was required to buy shares automatically. That's not a small universe. More than $800 billion in assets directly track the index, CNBC reported, more than half of which sits inside Invesco's QQQ, one of the most commonly held funds inside employer-sponsored 401(k) plans.
JPMorgan estimated QQQ alone generated roughly $4.3 billion in forced buying demand, according to Reuters. Across all the index funds and ETFs affected, total forced buying ran into the tens of billions, Benzinga reported.
If your 401(k) includes a Nasdaq-100 fund, a broad total market fund, or a target-date fund that holds either of those, SpaceX is probably in there now. You didn't pick it. That's the point.
What SpaceX's Nasdaq-100 weighting means for your 401(k)
Before you panic: the weighting is modest.
SpaceX came in at around 1.3%, according to a JPMorgan estimate cited by CNBC. That's partly because only a thin slice of SpaceX's total shares are actually available for trading. The rest are locked up, held by insiders who agreed not to sell for months after the IPO.
With most of the supply off the market, Nasdaq had to use a special multiplier formula just to calculate the weighting at all. If you're in a target-date fund, which holds a mix of stocks, bonds, and other assets, your actual SpaceX exposure is a fraction of that 1.3%.
That weighting will grow over time, though. SpaceX's lockup restrictions ease in stages over the coming months, and as more shares become freely tradeable, index funds have to buy more. The bigger the float gets, the more SpaceX counts in the index.
For now, the position is small. Give it a year and it probably won't be.
Why SpaceX in your 401(k) is a different kind of stock
SpaceX is not your average 401(k) holding. It's a founder-controlled, cash-burning aerospace and AI company, and it's been moving in double digits regularly since it went public.
JJ Kinahan, senior vice president at Cboe, told CNBC the day before inclusion: "We know volatility is high. There's a sense volatility may increase. Are you comfortable with a $20 expected move over the next 11 days?"
More Personal Finance:
- Dave Ramsey says one daily habit costs you $5,000 a year
- Estate plans for unmarried couples: Protect your partner, your wishes
- Estate planning for solo agers: How to protect yourself
SpaceX also isn't profitable. It posted a significant net loss in 2025 and the losses widened in early 2026.
That's actually the main reason it can't join the S&P 500 yet. While Nasdaq changed its rules to let SpaceX in early, S&P Dow Jones Indices refused to do the same and held firm on its requirement that companies show consistent profits before they can join.
SpaceX doesn't clear that bar until at least mid-2027, and only if it turns things around financially before then.
Which funds you hold determines whether any of this affects you. If your primary holdings are in S&P 500 funds like Vanguard's VOO or State Street's SPY, you don't have SpaceX yet.
But if you own QQQ, QQQM, or a total-market fund like Vanguard's VTI, you do.
Total-market funds tracking the CRSP index can add SpaceX as soon as five trading days after the IPO, making them faster than the Nasdaq-100 itself.
How to check if SpaceX is in your retirement funds
Most people don't need to panic. The weighting is small, and inside a target-date fund it's smaller still. But it's worth knowing what you actually own.
Log into your 401(k) and check which funds you hold. If you see a Nasdaq-100 fund, any QQQ equivalent, or a total-market index fund, SpaceX is in there.
If your plan's equity holdings are entirely in S&P 500 index funds, you're clear for now. Target-date fund holders have a small indirect slice but probably not enough to lose sleep over.
If the exposure does bother you, S&P 500 index funds still offer broad diversification across 500 large US companies without SpaceX, at least until mid-2027. Shifting some allocation there is a reasonable move if you'd rather not have a volatile, unprofitable rocket company sitting in your retirement savings right now.
More broadly, though, this is a good moment to pay attention to what's actually inside your funds.
Index rules changed. A company that wasn't publicly traded two months ago is now inside most Nasdaq-100 and total-market products. That can happen again. It probably will, actually, given how many large private companies are expected to go public in the next few years.
Knowing what your funds own matters more than it used to.
Related: Bank of America sets alarming SpaceX stock price target
The Arena Media Brands, LLC THESTREET is a registered trademark of TheStreet, Inc.
This story was originally published July 10, 2026 at 12:37 PM.