SpaceX and Tesla Consider Merger; Conglomerate Discount May Weigh on Overall Valuation
Business Insider analysis indicates that a merger between SpaceX and Tesla would span over ten business areas including aerospace, electric vehicles, AI, and robotics, and the market may apply a conglomerate discount to the group.
The potential merger between SpaceX and Tesla is currently in the formal consideration phase by both parties and has not yet resulted in a deal. However, this possibility raises a specific valuation question: if two companies spanning aerospace, electric vehicles, AI, robotics, and other fields were to merge into a single entity, how would investors price it?
First, consider the breadth of the combined entity's businesses. On the SpaceX side, this includes space launch services for Falcon 9 and Dragon, Starlink broadband internet, the Starshield government satellite system, Starlink mobile carrier operations, and Musk's grandest ambition of colonizing Mars. The Tesla side covers electric vehicle product lines such as the Model 3, Model Y, Cybertruck, and Roadster; Robotaxi autonomous driving; Optimus humanoid robots; Powerwall and Megapack energy storage systems; frontier AI models (Grok); AI infrastructure (Colossus); AI coding tools (Cursor); social media (X); and payment applications (X Money).
When a company operates across so many industries, the market does not always grant a trust premium. There is a specific term in finance for this phenomenon: the conglomerate discount. This means that a diversified company's stock price is lower than the sum of the valuations of its individual business segments. Investors fear the company may be too complex to manage, or that consolidated financial statements could obscure true operating conditions, or that strong business units might subsidize weaker ones.
A widely cited 1995 academic paper found that from 1986 to 1991, diversified companies in the sample exhibited a discount of approximately 13% to 15%. However, a 2024 McKinsey report offered a correction to this conclusion: the discount does not occur automatically but is linked to financial transparency and business performance. In other words, if a diversified company demonstrates strong performance across its segments and provides ample disclosure, the market may not apply a discount.