Musk and Bezos are building AI-powered holding companies that combine multiple businesses under single ownership, reviving the conglomerate model with AI as the unifying force.

What happened: Elon Musk is consolidating his empire by merging X and xAI into SpaceX, and is expected to add Tesla once SpaceX has a stock to use as currency. Jeff Bezos is building Prometheus, his "physical AI" lab, with plans for what sounds like an AI-powered version of Berkshire Hathaway. Both are following a decades-long pattern by Big Tech companies—Amazon started with retail but now spans cloud, ads, logistics, healthcare, and satellites; Alphabet started with search but now has self-driving cars and human-longevity research.

Why it matters: Conglomerates have historically struggled to create real value; as Honeywell's CEO notes, "that value creation got maxed out" for industrial-scale conglomerates in the era of globalization. AI could be different: if every company becomes a wrapper for AI, there is real value in putting them all under one owner with superior management, data, or operations. However, the same AI models that let CEOs see across a sprawling empire also let analysts and activists see through one, potentially dissolving the complexity conglomerates hide behind.

What to watch: If AI commoditizes operational excellence, then domain depth becomes the only real competitive advantage, which would argue for more focus rather than less. Musk and Bezos are testing whether the conglomerate model, which never had the right tools before, can succeed with AI as its organizing principle.