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S&P Dow Jones Indices said on Thursday that it would not change the requirements for entry into its major indexes, dealing a setback to Elon Musk’s SpaceX by effectively ruling out a quick path into the benchmark S&P 500 after what could become the largest initial public offering in history.

S&P Keeps Rules In Place

The index provider said in a press release late on Thursday that it would not shorten the 12-month seasoning period for newly public companies or waive existing profitability and public-float requirements based only on a company’s size. The decision diverges from changes adopted by rival index providers Nasdaq and FTSE Russell.

S&P said it will not change eligibility rules to fast-track index inclusion for megacap IPOs like SpaceX or Anthropic.

So even if SpaceX goes public at massive scale, it will likely have to wait for S&P 500 inclusion and settle for a faster path into the Nasdaq 100. pic.twitter.com/UQ8GBz2yvz

— Polymarket Money (@PolymarketMoney) June 4, 2026

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The move comes as Wall Street confronts a new reality. Some companies are reaching unprecedented valuations before they ever enter public markets, forcing index providers to decide whether rules written for a different era should bend for newly public giants.

S&P Dow Jones Indices opened a consultation earlier this year on how to treat so-called megacap companies, a process that effectively asked whether “fast entry” rules should apply to companies arriving at public markets at a scale once reserved for mature blue chips.

Fast Entry Debate Splits Wall Street Investors

The push for quicker inclusion has split investors. Critics say profitability, float and trading-history rules exist to keep benchmarks from chasing hype. Adding IPOs too quickly, they argue, could expose passive funds to greater volatility and force them to buy shares before the market has established reliable pricing.

Supporters, meanwhile, say indexes should quickly include large companies to better reflect the market investors actually own. They argue that trillion-dollar firms can become economically important long before they satisfy traditional index requirements.

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Nasdaq And FTSE Move Faster Than S&P

The outcome means SpaceX would not be eligible for the S&P 500 until at least one year after its listing. It would also need to meet existing rules on profitability and public float.

SpaceX is seeking to raise $75 billion at a roughly $1.75 trillion valuation. The company posted a $4.94 billion net loss in 2025 even as revenue rose 33% to $18.67 billion.

Nasdaq recently changed its rules so that SpaceX could join the Nasdaq-100 after 15 trading days, down from a three-month minimum. FTSE Russell adopted a similar fast-entry approach, allowing eligible large IPOs to enter after five trading days.

Photo courtesy: Shutterstock

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