The SpaceX-Tesla merger's biggest hurdle isn't Musk. It's Tesla's shareholders

The biggest obstacle to a SpaceX-Tesla merger is not Elon Musk's ambition. It's Tesla's shareholders, who hold the power to veto a deal that would create a roughly $3.5 trillion behemoth, the largest corporate tie-up in history. Musk, CEO of both companies, endorsed the idea during Tesla's earnings call late Tuesday, calling it "a lot of merit." But his own stake makes him a "conflicted party," barring him from the independent director committees formed to explore the combination. "It's an odd kabuki dance where two groups of people are talking and I can't be in the conversation," he said. "This is definitely the kind of question where I feel like I'm tap dancing through a minefield."

The real gatekeeper is the shareholder vote. Musk controls about 85% of SpaceX's voting power but only roughly 20% at Tesla. To proceed, the deal needs support from holders of a majority of all outstanding Tesla shares, not just those voted. Unvoted shares count as "no" votes, a threshold Musk himself called "quite a high hurdle." Portfolio manager Luke Rahbari of Rational Equity Armor Fund likened the process to "herding cats," adding "it's going to take some time and money." University of Michigan finance professor Nejat Seyhun says the outcome hinges on price: "At a zero premium, probably there would be some resistance, but at 20%, 30% or 40% premium I don't think there would be any."

The strategic logic for merging is efficiency. Combining the two would let Tesla and SpaceX pool engineers, technology, and research budgets, eliminating overlapping spending as both push deeper into artificial intelligence. "The lines are getting kind of muddled already," Rahbari said, noting shared tech and data. Tesla already uses SpaceX's Starlink at some Supercharger stations, a partnership he calls "beneficial for both companies." That kind of synergy is why both Rahbari and Seyhun expect the merger to eventually happen and believe it would benefit both companies, despite the governance friction.

Financially, the timing is notable. Tesla reported quarterly earnings late Wednesday, beating top and bottom line estimates even as revenue fell from a year earlier on weakness in its core automotive business. SpaceX, meanwhile, posted its first profit as a public company this week. Investors reacted positively to the merger talk: SpaceX shares jumped nearly 8% on Wednesday, their best single-session gain since August, while Tesla rose 3.4%. The market is clearly pricing in a real possibility of a deal, even as Musk himself warned against treating it as inevitable.

"Some people out there assume that a SpaceX and Tesla merger is a certainty, and I think that would be overstating it," he told analysts on the earnings call. That caution is warranted. The vote threshold means Tesla's retail and institutional shareholders effectively get a veto, and their willingness to approve will depend on the premium and the narrative around it. A zero-premium deal would likely face resistance, but a 20% to 40% premium could smooth the path, according to Seyhun.

For boards and executives watching, the episode is a masterclass in governance friction. A founder with outsized voting control on one side and a dispersed shareholder base on the other creates a structural tension that no amount of vision can bypass. The premium offered, the communication strategy, and the patience to herd cats will determine whether this becomes the largest deal in history or a cautionary tale. The next few months will show whether Musk can turn his "tap dance" into a standing ovation.