Musk's $250B Bet: SpaceX Swallows xAI in History's Largest Acquisition

Elon Musk announced on February 2, 2026, that SpaceX acquired his artificial intelligence startup xAI in a transaction that values xAI at $250 billion and SpaceX at $1 trillion.

The combined entity is worth $1.25 trillion. That makes it the largest corporate acquisition in history, surpassing all previous merger and acquisition records compiled since the 1870s.

Documents viewed by CNBC show the deal structured as a share exchange. xAI shareholders receive 0.1433 shares of SpaceX stock for every share of xAI they hold. At the deal prices, xAI stock traded at $75.46 per share and SpaceX at $526.59.

The Strategic Rationale

Musk published a memo on SpaceX's website explaining the rationale. He described the combined entity as "the most ambitious, vertically-integrated innovation engine on (and off) Earth, with AI, rockets, space-based internet" and X, the social media platform.

Building orbital data centers is the main objective, Musk told investors.

SpaceX currently operates Starlink, the satellite internet service with over 6,000 satellites in low Earth orbit. NASA contracts fund moon missions while Department of Defense contracts pay for classified launches. The company's reusable rockets have cut launch costs by an order of magnitude compared to traditional aerospace.

xAI makes Grok, a chatbot competing with OpenAI's ChatGPT and Anthropic's Claude. The startup raised $20 billion at a $230 billion valuation in January 2026, one month before the acquisition. Nvidia, Cisco, and unnamed institutional backers invested in that round.

The record-setting transaction is the largest merger of all time and values SpaceX at $1 trillion and xAI at $250 billion.

— CNBC, viewing deal documents

The Numbers Behind the Deal

Bank valuation documents obtained by CNBC value SpaceX between $859 billion and $1.26 trillion. The xAI valuation range sits between $219 billion and $294 billion.

xAI burns through cash building infrastructure to compete with OpenAI and Anthropic. The deal provides the capital runway. OpenAI was last valued at $500 billion in October 2025. Anthropic signed a term sheet in January 2026 for a funding round valuing it at $350 billion.

xAI's financial position before the acquisition showed strain. The company spent aggressively on GPU clusters and data center buildouts. The $20 billion raised in January provided runway but not indefinitely.

SpaceX, by contrast, generates revenue from Starlink subscriptions, NASA contracts, and commercial satellite launches. The company is profitable on an operational basis. Combining the two entities gives xAI access to SpaceX's balance sheet and cash flow.

IPO Plans and Market Timing

The acquisition comes ahead of a planned SpaceX initial public offering. The Financial Times reported in December 2025 that SpaceX could raise up to $50 billion at a valuation as high as $1.5 trillion.

Musk called that report "accurate" shortly after it published. The FT separately reported that the IPO is planned for mid-June 2026, potentially timed to align with Musk's birthday and a planetary alignment.

The deal structure creates a unified entity ahead of that IPO. Investors who backed xAI in earlier rounds now hold SpaceX equity at the pre-IPO valuation. That simplifies the capitalization table and removes one layer of corporate structure that would have complicated a dual offering.

What the IPO means in practical terms: retail and institutional investors will be able to buy shares in an entity that includes rocket manufacturing, satellite internet, and frontier AI research. That bundle has no precedent in public markets.

Historical Context

Wikipedia's list of largest mergers and acquisitions, updated in February 2026, now shows the SpaceX-xAI deal at the top. The previous record holder was Vodafone's acquisition of Mannesmann in 1999 for $183 billion, adjusted for inflation to $353.7 billion.

AT&T appears in the historical records six times with a combined transaction value of $334.4 billion across multiple deals spanning decades. SpaceX enters the list with a single transaction exceeding that sum.

Pakistan's GDP sits below $250 billion. The country ranks 42nd globally in economic output. BHP and Australia's big four banks are the only Australian companies with larger market caps.

The AI Competition

Musk co-founded OpenAI in 2015. He left in 2018, citing disagreements over the company's direction. Microsoft partnered with OpenAI afterward, investing over $13 billion and integrating OpenAI models into its products.

Musk launched xAI in July 2023. The company released Grok in November 2023 as a chatbot available to subscribers of X Premium. Grok distinguishes itself by allowing users to generate images with fewer content restrictions than competitors.

That feature recently generated controversy. In January 2026, reports surfaced that users created sexualized images using Grok, including images depicting minors. The incident led to criticism of xAI's safety guardrails.

The acquisition gives xAI resources to scale. It also integrates xAI's models into SpaceX's operational infrastructure. Starlink's constellation generates massive amounts of data. Grok could process that data to optimize satellite positioning, predict maintenance needs, and improve signal routing.

Legal Representation

Sullivan & Cromwell advised xAI on the transaction. The law firm announced the deal on its website in February 2026, describing it as "a historic transaction that values xAI at $250 billion."

SpaceX's legal advisers were not publicly disclosed in initial reports.

What Happens Next

The IPO is planned for June 2026, giving the merged entity four months to operate as a combined business before facing public market scrutiny.

The combined company will need to demonstrate how AI and space infrastructure create synergies beyond Musk's public vision. Orbital data centers sound futuristic. The economics need to work.

SpaceX's existing business is capital-intensive but cash-generative. xAI's business is capital-intensive and cash-consumptive. The combination needs to show that the AI division adds value beyond what SpaceX would generate independently.

Early xAI investors convert to SpaceX equity at a $250 billion valuation. One month prior, xAI was valued at $230 billion. That's an 8.7% markup in 30 days.

For the public markets, the June IPO will test whether investors value the combined entity at the $1.5 trillion upper range the FT reported or closer to the $859 billion lower bound from bank valuations.

The deal creates the largest private company in history ahead of what could be the largest IPO in history. Whether it creates long-term shareholder value depends on execution after the headline fades.