On Thursday, S&P Dow Jones Indices announced it will not shorten the 12-month waiting period for newly public companies to join the S&P 500, even if those companies are worth three-quarters of a trillion dollars the moment they list. The decision lands nine days before SpaceX — the most anticipated IPO in American history — is set to price at $135 a share, raising roughly $74 billion at a valuation somewhere north of $1.7 trillion.

Predictably, the response from certain quarters has been indignation. How dare a stodgy index committee, staffed by people who still use Bloomberg terminals with beige keyboards, make Elon Musk wait? Doesn’t S&P understand that SpaceX is no ordinary company? That it lands rockets on barges, that it is redefining connectivity, that it is — we are reliably informed — going to Mars?

It understands perfectly. That is precisely the problem.

The consultation S&P launched earlier this year was effectively a question about whether the rules should bend for genius. The answer was no. And the answer is worth defending, because the alternative is an index constructed around vibes.

The Profitability Rule Wasn’t the Real Fight

Much of the coverage has focused on the profitability requirement — SpaceX has been profitable, by some measures, for a few quarters now. That part is a red herring. The sharper edge of Thursday’s decision is the 12-month seasoning rule, which requires a company to have been public for a full year before index inclusion, and the refusal to waive it based on sheer market capitalization.

This matters because the entire point of the S&P 500 — what separates it from a theme ETF or a meme-stock basket — is that it does not chase the new thing. It waits. It watches a company file four quarterly reports, survive an earnings call where analysts ask actual questions, and demonstrate that its internal controls survive the scrutiny that comes with being a public company rather than a visionary’s private fiefdom.

FTSE Russell and Nasdaq both moved to accelerate index entry for large IPOs. S&P, alone, held the line. There is a reason the S&P 500 remains the benchmark that matters: because it is boring on purpose.

A History Lesson the Bulls Don’t Want to Revisit

Ask yourself what would have happened if the fast-track had existed in 2021. Rivian priced at $78 in November of that year, briefly touched a $150 billion market cap — more than Ford at the time — and would have been swept into the S&P 500 within weeks. By the following spring it was trading below $20. Index funds would have bought billions of dollars of Rivian stock near the top, automatically, because a formula said they had to.

This is not ancient history. Arm Holdings went public in September 2023 at $51, doubled in a month on AI mania, and spent most of the next year giving those gains back. The pattern is consistent enough to be a law: the companies that generate the most excitement at IPO are the ones whose early public-market pricing is least tethered to fundamentals.

“We have a checklist,” one member of the index committee’s advisory panel told me, speaking on condition of anonymity because the deliberations were confidential. “We don’t get a bonus if a stock goes up. We get blame if we put something in the index and it collapses. The incentives are not subtle.”

It is an unglamorous point. But the ordinary mechanics of institutional caution do more to protect retail investors than any amount of fintech disruption. The 401(k) holder who owns the S&P 500 through a Vanguard fund does not need her retirement savings to be a call option on the conviction that this time the visionary really has cracked it.

The Cult of the Exceptional Founder

The argument for fast-tracking SpaceX is, at bottom, an argument that the rules should not apply to people we have decided are exceptions. Musk is not a normal CEO. SpaceX is not a normal company. Therefore normal governance should step aside.

This is not a new pitch. It is the same logic that convinced SoftBank to write Adam Neumann a billion-dollar check with effectively no oversight, that persuaded Wall Street that Elizabeth Holmes was too brilliant to need peer review, that told investors Sam Bankman-Fried was playing a different game altogether. In every case, the lesson was the same: the more insistently someone argues they are exceptional, the more essential it becomes to verify the exception with time.

S&P’s rule does not prevent anyone from buying SpaceX stock. It does not prevent SpaceX from raising capital, going public, or changing the world. It merely says that the default savings vehicle for millions of Americans will not be forced to buy in until the company has demonstrated, over twelve months of public scrutiny, that its governance, its financials, and its valuation bear some relationship to reality.

Let the Hype Burn Off First

The 12-month wait is not a sanction. It is a cooling-off period — for markets, for narratives, and for the particular kind of enthusiasm that attaches to a company whose founder dominates the news cycle. By June 2027, SpaceX will have reported three quarters of results. Analysts will have modeled the Starlink revenue trajectory. The gap between what the company says and what the filings show will have either narrowed or widened. The index will know more.

Waiting to know more before making the largest passive investment vehicle in the world a compulsory buyer is not cowardice. It is the minimum viable prudence.

S&P’s committee made the correct, unsexy call. The index should reflect what has proven durable, not what is currently dazzling. If SpaceX is everything its backers claim, the S&P 500 will own it soon enough. A year is not a long time. Unless, of course, you suspect the excitement can’t survive one.

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