The two companies owned by Elon Musk are reportedly merging ahead of an IPO. But what does it all mean? Two of Elon Musk’s best-known companies look likely to be headed for a mega merger ahead of a mooted IPO. SpaceX, the South African entrepreneur’s space exploration firm, and xAI, the AI company he established in 2023 to challenge OpenAI, are reportedly in discussions ahead of a merger and initial public offerings.