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I’ve been watching the rumours around the SpaceX IPO lately, and while everyone is focusing on the $1.7 trillion valuation or the prospect of finally owning a piece of a rocket company, there’s a much more interesting story happening underneath it all. It’s how the stock market is essentially rewriting its own rulebook to accommodate a company of this size.

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The rule that changes everything

If you’ve followed how companies list on a stock exchange, you know there’s usually a seasoning period. Historically, a new company had to wait several months, or even up to a year, before it could be included in a major index like the Nasdaq-100. This acted as a safety mechanism, used to give the market time to settle, and forced the company to prove it could handle public scrutiny before it became part of the indices most of us own.

But as of May 1, the Nasdaq has officially changed the game with a new “Fast Entry” rule. Under this new rule, if a company is large enough specifically, if its market cap ranks in the top 40 of the existing Nasdaq-100, it can skip the year-long wait and join the index in just 15 trading days.

SpaceX is definitely large enough at a $1.7 trillion target, and would immediately become one of the top five or six most influential companies in the entire index. We’re looking at a company that will go from being private for two decades to one that takes up a massive chunk of your portfolio, in less than three weeks. And allowing for this to happen fundamentally shifts how the price of the stock will behave.

Passive funds become forced buyers

Something else to think about is when a stock is added to the Nasdaq-100, every index fund that tracks that index (like QQQ) is required to buy it. They don’t get to look at the valuation and decide it’s too expensive. They don’t get to wait for a better entry point. They are forced buyers. By shortening the entry window to 15 days, the exchange is creating a massive wave of buying pressure almost immediately after the IPO. This provides a huge amount of liquidity, essentially a guaranteed list of buyers for investors to sell their shares to.

The rule change creates a massive dilemma for active fund managers (the people who are paid to beat the market). Professional managers are judged against a benchmark, like the Nasdaq-100. If SpaceX enters the index at a 5% weighting and the stock shoots up, any manager who doesn’t own it will underperform their benchmark significantly.

Even if an active manager thinks SpaceX is wildly overvalued, they often can’t afford to not own it. If the stock rallies and they’re sitting on the sidelines, they look like they’ve missed the biggest story of the decade, which can lead to clients pulling their money. They are essentially forced into a “FOMO trade” to protect their performance metrics. Between the passive ETFs that must buy and the active managers who are scared not to buy, you have a recipe for a price that is driven more by index mechanics than by actual business fundamentals.

Valuation won’t matter

The concern here is that SpaceX is reportedly aiming for a valuation that is 100 times its revenue. In a normal IPO, the market would spend months debating if that price makes sense. But with the Fast Entry rule, that debate is cut short. The “machines” and the benchmark sensitive managers are forced to step in before the market has really had a chance to breathe.

I’m not saying SpaceX isn’t an incredible business. They own the satellite launch market and Starlink is a cash-flow machine. But we have to recognise that the guardrails of the market are being moved. Usually, the index acts as a filter, only letting in companies that have stabilised. Now, the index is being used as a tool to absorb massive amounts of private equity almost instantly.

New era for public listings

If you’re looking at SpaceX as a discovery piece for your own portfolio, you have to look past the rockets and look at the order book. The first 15 days will be the “hype” phase, but Day 15 and beyond will be the “forced buying” phase where the passive and active funds have to pile in.

We’re entering a new era where the biggest companies in the world are being allowed to bypass the traditional checks and balances. It’s a bold move for the Nasdaq, and it’s a massive win for SpaceX insiders, but for the average investor, it means you are buying into a stock that hasn’t truly been seasoned by the open market yet.

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The rockets might be heading to Mars, but the stock is heading straight into your index fund whether you like it or not.