SpaceX cracks top 5 on Robinhood as retail bet on $26.5T AI prize

SpaceX's entry into Robinhood's top five reflects a convergence of several factors. The company's record-breaking IPO—raising nearly $86 billion—capitalized on Elon Musk's personal brand and Robinhood's 28 million funded customers, many of whom follow Musk closely. However, the driving force behind sustained investor conviction appears to be the xAI acquisition earlier this year, which reframed SpaceX not merely as a space-launch and satellite-internet company but as a portfolio holding spanning multiple AI and infrastructure assets.

Starlink's established business—roughly 12 million subscribers with profitable margins—provides a concrete revenue foundation. The long-term bet, though, is speculative: SpaceX claims xAI has a $26.5 trillion total addressable market, a figure that depends on the company's ability to build operational space-based data centers and deploy them at a scale that captures meaningful AI compute demand. The company's regulatory filings reference ambitious projects like data centers in orbit and even asteroid mining, and Musk's incentive structure explicitly rewards a Mars colony of 1 million people. These goals are neither near-term nor certain. For retail investors on Robinhood to sustain conviction as the stock ranks No. 4, they are implicitly betting that SpaceX will achieve a significant fraction of these ambitions—and that Starship will reach operational reliability at a commercial scale.