Democratic Sen. Elizabeth Warren of Massachusetts speaks to members of the media in the Senate Subway at the U.S. Capitol on Tuesday, May 19, 2026 in Washington, DC, USA.
Al Drago | Bloomberg | Getty Images
Sen. Elizabeth Warren, D-Mass., has expressed concern about whether recent rule changes for stock indexes have cleared the way for stock indexes. space x — and potentially OpenAI and Anthropic — will be included in the index without the typical protections for investors.
A letter sent Thursday to the heads of the Nasdaq, S&P Dow Jones, FTSE Russell and Morningstar indexes asked the companies whether they had made or considered any rule changes based on lobbying from Elon Musk and others involved with SpaceX, or those associated with OpenAI and Anthropic, and asked for any communication between the companies and the indexes. CNBC first reported the letter.
Warren also detailed the changes and proposed changes the index was considering, including allowing newly listed stocks to be included more quickly in the top index.
“However, changing index rules to accommodate these large companies could destabilize markets and pose significant risks to U.S. investors, especially retirees and other individuals who rely on index funds for their savings.”
SpaceX is scheduled to begin trading on Friday, valuing the company at about $1.8 trillion, making it the largest initial public offering in history. OpenAI and Anthropic have similarly secretly filed for IPOs.
Spokespersons for the four companies did not respond to requests for comment.
Earlier this week, Warren asked the SEC to delay SpaceX’s proposal, citing concerns that the agency was not conducting due diligence to protect investors and the health of the market.
