CNBC Analysis: Potential Mergers and IPOs of SpaceX, Tesla, and Anthropic Could Reshape S&P 500, But Not in the Short Term. SpaceX CEO Musk stated on an earnings call last week that he is considering merging SpaceX with Tesla, which could become the largest M&A deal in history. Additionally, AI company Anthropic filed an S-1 document with the U.S. Securities and Exchange Commission (SEC) on Monday, indicating its intention to go public. These two developments could significantly impact the composition of the S&P 500 index, but due to the index's typical 12-month waiting period for new listings, they are unlikely to be included in the short term. Experts point out that if these companies eventually enter the S&P 500, it could increase investor exposure to Musk's companies and exacerbate the index's concentration risk, further skewing it towards the technology and AI sectors.