Senator Elizabeth Warren, Democrat from Massachusetts, speaks to members of the media in the Senate Subway at the US Capitol on Tuesday, May 19, 2026 in Washington, DC, US.
El Drago Bloomberg | getty images
Sen. Elizabeth Warren, D-Mass., is raising concerns about whether recent rule changes have cleared the way for stock indexes to spacex – and potentially OpenAI and Anthropic – are to be included in the index without some specific safeguards for investors.
Letter to heads of Nasdaq, S&P dow jones indexFTSE Russell and Morningstar Indices asked companies on Thursday whether they had made or considered rule changes based on lobbying by Elon Musk, other SpaceX executives or executives of OpenAI or Anthropic, and asked about any communications between the companies and the index. CNBC is the first to report this letter.
Warren also detailed the changes or proposed changes the index was considering, including the rapid inclusion of newly listed stocks into the top index.
“Changes to your index rules to accommodate these larger companies, however, have the potential to destabilize markets and pose significant risks to U.S. investors, particularly retirees and other individuals who rely on index funds for their savings.”
SpaceX is set to begin trading on Friday in what is poised to become one of the largest public offerings in history, valuing the company at about $1.8 trillion. OpenAI and Anthropic have also filed for IPO confidentially.
Earlier this week, Warren asked the SEC to delay SpaceX’s offering because the agency did not conduct due diligence in protecting investors and the integrity of the market.
