Wall Street Says the Tesla-SpaceX Merger Is 90% Certain. The Math Says Be Careful

Elon Musk lost roughly $18 billion in a single day last week, and Tesla stock is now sitting near its 52-week low around $304, down more than 37% from its 2026 high. The reason isn't a bad earnings print or a recall. It's a merger that hasn't happened, that Musk himself called "absurdly fake news," and that Wall Street analysts are nonetheless pricing as 80-90% likely to happen anyway.

Photo by Craig Adderley on Pexels

If you own TSLA and you've been told the SpaceX merger is the thing that finally justifies the stock's valuation, you should look at the actual numbers before you relax.

What everyone agrees on: the size of the deal

After SpaceX's June 2026 IPO raised $75 billion at a $1.77 trillion valuation, the arithmetic of a combined Tesla-SpaceX entity became impossible to ignore. Put the two companies together and you get something in the neighborhood of a $3.5 trillion conglomerate — the fourth most valuable company on Earth, folding in cars, rockets, Starlink, and whatever xAI eventually becomes.

Wedbush's Dan Ives has put merger odds above 80%. Gene Munster raised his estimate to 90% after Musk's comments on Tesla's Q2 earnings call about "growing overlap" between the companies. JPMorgan called the combination "strategically coherent on paper." That's a lot of smart money pointing the same direction.

The number nobody's headline is leading with

Here's the part that gets buried under the excitement: BNP Paribas has an underperform rating on Tesla with a $280 price target — below where the stock trades even today — and its reasoning is specific. The firm projects roughly $216 billion in cash burn at SpaceX between 2026 and 2031. That's not a rounding error. Analysts at RBC and JPMorgan have separately floated the risk of up to $750 billion in value erosion for existing Tesla shareholders if the merger goes through on unfavorable terms.

The mechanism is straightforward: if SpaceX is burning that much cash on Starship, Starlink buildout, and Mars ambitions, and Tesla shareholders end up absorbing that burn through an all-stock deal, the "premium" being floated — RBC's Tom Narayan pegs it at 20-30% for Tesla holders — could be more than offset by taking on a much more capital-hungry business.

This is the same tension I flagged with Apple's post-earnings wipeout: a headline number (Apple "beat every estimate," Tesla "merges into a $3.5T giant") can mask a structural problem that only shows up when you follow the cash flows.

Musk's denial doesn't actually settle anything

On July 31, Musk dismissed a Wall Street Journal report that Tesla executives were told to prepare for a separation of Tesla's China business ahead of a SpaceX merger, calling it "absurdly fake news" and saying "this has never even come up in a discussion ever." TSLA jumped overnight on the denial.

But notice what he didn't deny: the merger itself. He denied a specific structural detail (the China carve-out), not the underlying combination. Fortune has even run pieces arguing SpaceX "may have missed its window" to acquire Tesla at attractive terms, given how far SpaceX's valuation has run relative to Tesla's beaten-down stock. That's a market structure problem, not a rumor problem — and it's still unresolved either way.

Photo by SpaceX-Imagery on Pixabay

Where the smart money and the crowd disagree

This is the detail that made me want to write this up rather than skip it: prediction markets are nowhere near as confident as the analysts quoted in financial media. Bettors on crypto prediction markets have priced the odds of a merger closing "before March 1, 2027" at just 41%, rising to 45% for a May 2027 deadline. Compare that to Dan Ives' 80%+ or Gene Munster's 90%.

That's a real gap between two different pools of money — one making bank-analyst-style directional bets with no capital actually at risk on the specific timeline, and one putting real dollars on a dated, binary outcome. When sell-side conviction runs that far ahead of market-based odds, it's usually a sign the sell-side is extrapolating from a CEO's off-hand comment on an earnings call more than from deal mechanics.

• TSLA price: ~$304, near its 52-week low of $297.38 (52-week high: $498.83)
• Implied combined entity size: ~$3.5 trillion
• SpaceX projected cash burn, 2026-2031: ~$216 billion (BNP Paribas estimate)
• Estimated shareholder value erosion risk: up to $750 billion (RBC/JPMorgan)
• Prediction market odds of a deal by March 2027: 41%, versus 80-90% from Wall Street analysts

My read: the stock is pricing in a narrative, not a spreadsheet

Tesla's core auto business is already dealing with declining margins this year, which is a big part of why the stock has fallen 26% in just the last four weeks even before you factor in merger noise. A merger narrative that promises a 20-30% takeover premium is an easy story to want to believe when the underlying business is struggling on its own.

But a premium on paper doesn't mean anything if what you're buying into is a business burning through capital faster than Tesla's own free cash flow can support. If I'm holding TSLA right now, I'm not selling because a merger might happen — I'm making sure I understand that the "merger premium" bulls are pricing in assumes favorable terms that aren't guaranteed, and that at least two major shops (BNP Paribas, and implicitly RBC/JPMorgan on the downside scenario) think the math could run the other way entirely.

What would change my mind: a concrete, filed deal structure with actual exchange ratios, rather than earnings-call hints and WSJ sourcing. Until that exists, the 41% prediction-market odds look more honest than the 90% analyst headline.

This is not financial advice — always do your own research before making investment decisions.