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S&P Dow Jones Indices considers new index rules as mega IPOs loom

By Thomson Reuters Apr 30, 2026 | 5:45 PM

April 30 (Reuters) – S&P Dow Jones Indices said on Thursday it has kicked off a consultation that could result in ​major changes to rules governing the ‌entry of companies into its indexes such as the S&P 500.

As high-profile names such as Elon Musk’s rocket maker SpaceX and AI heavyweights Anthropic and OpenAI ‌prepare ​to go public, index operators ⁠are racing to address ⁠the long waiting time for newly listed large-cap companies to join flagship equity benchmarks.

Here are some details:

• S&P DJI is considering ​reducing the time a company needs to be public before being eligible for index ⁠inclusion to six months from ⁠12 months.

• It is also ​mulling excluding the profitability requirements for large-cap companies.

• “These ​megacap companies may pose unique challenges for index ‌methodologies within the relevant index families, which were originally designed for more conventional listing profiles,” S&P DJI said.

• Exchange heavyweight Nasdaq last ⁠month unveiled a new set of rules to speed up the entry of newly listed large-cap companies ⁠to its ‌flagship equity benchmark Nasdaq-100.

• Other ⁠indexes such as the FTSE Russell ​are ‌also racing to overhaul the rules ​governing their ⁠benchmark indexes.

• S&P’s market consultation is open until May 28, with potential changes, if adopted, likely to be tentatively implemented on June 8.

(Reporting by Arasu Kannagi Basil in Bengaluru; Editing by ​Sahal Muhammed)