A potential merger between SpaceX and Tesla Inc. could create a $5 trillion entity, rivaling Nvidia Corp. for the title of the world's most valuable company. Prediction markets are increasingly pricing in the possibility of such a transaction, driven by SpaceX's surging valuation and strategic synergies involving artificial intelligence and robotics.

SpaceX has surged nearly 50% to roughly $2.6 trillion following its recent initial public offering, significantly outpacing Tesla's $1.5 trillion market capitalization. Bloomberg columnist Liam Denning suggests that the widening valuation gap makes a merger more attractive, as SpaceX could absorb Tesla with fewer newly issued shares. An all-stock deal offering Tesla a one-third premium would value the automaker north of $2 trillion, potentially leaving Elon Musk with about 74% of the voting rights in the combined entity.

The financial mechanics of the merger are complex. SpaceX would pay approximately 138 times forward EBITDA for Tesla, a company currently described as cash-burning. Outside investors in SpaceX would see their stake diluted from roughly half the company to under a third. Morningstar has pegged SpaceX's fair value at $780 billion, significantly less than its current trading price on a 4% float.

Strategic Synergies and Risks

Beyond financial engineering, the merger is viewed through the lens of technology integration. SpaceX has already absorbed xAI at a $250 billion valuation and agreed to buy coding startup Cursor for $60 billion. Incorporating Tesla would add real-world robotics data from Full Self-Driving and the Optimus robot to SpaceX's existing Starlink orbital footprint.

For Nvidia, the primary threat lies in the vertical integration of these companies. Tesla, xAI, and SpaceX are major chip purchasers, but Musk has proposed building his own semiconductor fabrication plant, dubbed Terafab. This facility, estimated to cost roughly $25 billion, aims to produce Tesla's AI5 chips and custom silicon for satellites, reducing reliance on external suppliers.

Market Odds and Regulatory Hurdles

Prediction markets reflect growing speculation about the merger. Polymarket indicates a 69% chance that Nvidia retains its crown as the largest company by the end of 2026. Meanwhile, Kalshi traders price the probability of a SpaceX-Tesla merger before May 2027 between 45% and 55%, a rise from the mid-20s earlier in the year.

Regulatory approval remains a significant barrier. SpaceX operates as a national security asset with classified satellite work, while Tesla possesses deep manufacturing and consumer exposure in China. Regulators may hesitate to place defense infrastructure and a global automaker under a single corporate umbrella due to antitrust and national security concerns.

SpaceX (SPCX) has surged to a $2.65 trillion market cap, surpassing Amazon.com Inc., driven by a tiny 4% float of available shares and intense investor hype. This valuation stands in stark contrast to the $780 billion fair value estimate by Morningstar equity analyst Nicolas Owens. The company's rapid ascent follows its June 12 debut, where shares closed at $161, and has since climbed to $192.50, fueled by a forced wave of buying from index funds and a staggered lock-up schedule that limits supply.

Business Breakdown and Valuation

The company's revenue composition and profitability differ significantly from its "space" branding. In 2025, SpaceX generated $18.67 billion in total revenue. Starlink contributed approximately 69% of this total, delivering $4.4 billion in operating income at a 39% margin. Conversely, the rocket launch business contributed only 13% of revenue with 9% year-over-year growth. The xAI unit, absorbed in February 2026, brought in $3.2 billion in revenue but recorded $6.4 billion in operating losses. Owens' discounted cash flow model values the mature core of rockets and Starlink at $611 billion, while the AI segment adds roughly $170 billion on a probability-weighted basis.

Financial Performance and AI Spending

SpaceX posted a $4.94 billion net loss in 2025 following the xAI merger and lost another $4.28 billion in the first quarter of 2026. The AI segment remains the primary financial drain, with the company pouring $12.7 billion into AI initiatives last year. Owens estimates only a 7% chance that Starship becomes rapidly reusable and that orbital data centers prove cheaper than ground sites simultaneously. Prediction markets on Kalshi give a 39% chance of a one-megawatt data center going live in orbit before 2035.

Index Inclusion and Lock-Up Calendar

A major catalyst for the stock is the upcoming Nasdaq 100 inclusion. Following a March 2026 rule change creating a "Fast Entry" pathway, SpaceX qualifies for index addition in roughly 15 trading days. Analysts estimate passive funds could purchase close to 30% of the available float. The S&P 500, however, will not allow SpaceX to join for at least a year. Concurrently, SpaceX has implemented a staggered lock-up schedule. Insiders can sell 20% of holdings two days after the first earnings report in August, with additional tranches unlocking through day 180. Elon Musk and major backers have voluntarily extended their restrictions to 366 days.

Key Financial Metrics