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 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.
