Study Warns AI Stock Crash Could Wipe 15% From Passive Retirement Accounts

A retiree with $100,000 sitting in a standard S&P 500 index fund, the kind of conservative, set-and-forget investment millions of Americans rely on, could lose roughly $15,500 from AI-linked stocks alone if those holdings were to fall by 50%. They would not have needed to buy a single share of any AI company directly. The exposure would have arrived automatically, by design, through the mechanics of passive index investing.

That is the central finding of a new analysis from DayTrading.com, which examined how the coming wave of AI mega-IPOs, including SpaceX, OpenAI, and Anthropic, could quietly reshape the risk profile of ordinary retirement portfolios, without the savers who hold them making any active choice to take that risk.

How Passive Investing Works, and Where It Gets Complicated

When you put money into an S&P 500 index fund, you are buying a slice of every company in that index, weighted by size. The bigger the company, the more of your money flows into it automatically. You do not pick the stocks.

This works well when the index is spread across hundreds of companies with varied risk profiles. The problem arises when it becomes heavily skewed toward a small group of companies in a single sector, particularly when new, loss-making companies with speculative valuations are added quickly and at scale. That is exactly what the DayTrading.com analysis warns is about to happen.

The Numbers Behind the Warning

The study models a scenario in which AI-linked stocks, covering semiconductors, cloud infrastructure, major platforms, and the incoming IPO cluster, represent approximately 31% of the S&P 500. A 50% correction across that group would produce the following losses in a passive account fully invested in the index:

• $100,000 account: ~$15,500 loss from AI holdings alone
• $500,000 account: ~$77,500 loss
• $1,000,000 account: ~$155,000 loss

These are not losses from picking the wrong stock. They are losses that would be distributed across every passive investor in proportion to their account size, simply because the index absorbed a cluster of highly valued, largely unprofitable companies.

Three Companies, Trillions in Valuation, and Years of Losses

SpaceX, OpenAI, and Anthropic are each preparing for IPOs at valuations that have attracted considerable attention, and considerable scepticism.

SpaceX is targeting a valuation of between $1.75 trillion and $2 trillion, despite reporting a $4.9 billion loss in 2025. Since the company was founded, it has accumulated $37 billion in total losses, more than any company going public in recorded history, according to the analysis. A planned merger with xAI adds an estimated $14 billion in annual cash burn on top of that. The implied valuation of roughly 90 times revenue stands in sharp contrast to the 3–8x revenue multiples typical of large-cap companies.

OpenAI is laying the groundwork for an IPO at approximately $1 trillion. Anthropic, the company behind the Claude AI assistant, was most recently valued at around $380 billion in a February 2026 funding round and is expected to target a public market valuation of around $500 billion.

The DayTrading.com study notes that this IPO wave is not purely a celebration of success. It is, in part, a response to a funding crunch: private capital markets can no longer absorb the capital requirements of these companies, and public markets, including the passive capital that flows automatically through index funds, represent the next available pool of money.

As Dan Buckley, Chief Analyst at DayTrading.com, puts it:

“The AI IPO wave is not simply a milestone for these companies. It is a response to an acute funding need that private markets can no longer meet alone. A retiree with $100,000 in an S&P 500 fund did not sign up to be a venture capitalist in a money-losing rocket company burning $4 billion a quarter.”

The Rule Change That Makes This Happen Faster

Under Nasdaq rules that took effect in May 2026, large new listings can join the Nasdaq-100 within approximately 15 trading days of going public. The traditional waiting period, which allowed the market time to price a company before index funds were obligated to buy it, has been removed. Within weeks of a company like SpaceX listing, hundreds of millions of dollars in passive fund capital will be automatically allocated to it, regardless of whether the market has had adequate time to assess its true value.

The DayTrading.com analysis models SpaceX’s day-one index weight at approximately 0.4% of the S&P 500, around $400 of exposure per $100,000 invested. But as insider lock-up periods expire and the publicly tradable share of the company grows, that figure could climb toward 3%, or roughly $3,000 per $100,000 invested. That would represent a material slice of an ordinary retirement account held in a single, founder-controlled company with decades of cumulative losses.

The Market Is Already More Concentrated Than It Was at the Dot-Com Peak

The incoming IPOs would land in an index that is already unusually concentrated. According to data from RBC Wealth Management, the ten largest companies in the S&P 500 now account for approximately 38% of the entire index. At the height of the dot-com bubble in 2000, that figure was 27%.

The last time US equity markets were this concentrated at the top, the decade that followed was difficult for passive investors, particularly those drawing down savings in retirement. Adding SpaceX, OpenAI, and Anthropic to an already top-heavy index would push that concentration further still.

Why This Is Relevant to Bitcoin and Crypto Investors

Many people who hold Bitcoin or other digital assets also maintain traditional retirement accounts, 401(k)s, IRAs, or equivalent wrappers, often invested in passive index funds. These two parts of a portfolio are sometimes thought of as separate: crypto is the speculative allocation, while the index fund is the “safe” part.

If the DayTrading.com analysis is correct, that distinction is eroding. The “safe” passive allocation is now absorbing more speculative, loss-making companies than at any point in recent history, and it is doing so faster than ever thanks to the new Nasdaq fast-entry rules. There is also a correlation risk: AI stocks and crypto assets have shown periods of significant co-movement during risk-off events, meaning a sharp correction in AI mega-caps would not necessarily leave Bitcoin untouched.

What Passive Investors Can Do

The DayTrading.com study does not argue that investors should sell their index funds. What it argues is that awareness matters, and that the risk profile of a passive S&P 500 fund in 2026 is meaningfully different from what it was five or ten years ago.

Check your actual holdings

 Most brokers now display the top holdings in any fund you own, and that list will change as new listings are added to the index.

Consider equal-weight alternatives

 Equal-weight versions of the S&P 500, such as the Invesco Equal Weight ETF (RSP), spread exposure more evenly across all 500 companies, reducing the concentration risk at the top.

Think about your time horizon

Someone with 20 years until retirement can ride out a correction in ways that someone already drawing down savings cannot. For near-retirees, a 15% drawdown from a single sector is real money that may be needed soon.

Speak to a financial adviser

Asset allocation decisions depend on personal circumstances that no study or article can account for.

The Wider Picture

The combination of record-high index concentration, fast-entry rules for new listings, and a cluster of loss-making companies seeking trillion-dollar valuations creates conditions in which ordinary investors may end up carrying speculative exposure they did not seek and cannot easily see. As the AI IPO wave develops across 2026, how passive investment products absorb these listings deserves more attention than it is currently receiving.

You can read the full analysis at DayTrading.com.