Goldman Sachs put the note out on a Friday. It was not about Mark Zuckerberg, not exactly. It was about arithmetic — what the companies building artificial intelligence would have to sell, in a year, to cover what they are spending to build it. By 2:30 p.m. Eastern, Zuckerberg was $8.9 billion poorer, according to Forbes, the largest single-day loss anywhere on the magazine’s real-time billionaire list.
The mechanics were plain. Meta Platforms stock, of which Zuckerberg owns roughly 13 percent, fell about 4 percent to $749.26, surrendering most of a 4.5 percent gain posted the day before. His estimated fortune settled at $257.5 billion.
What the Goldman note said was this: the AI hyperscalers — it named Meta alongside Microsoft, Alphabet, Amazon and Oracle — need to generate roughly $300 billion a year in AI services revenue just to break even on their capital spending. To earn meaningful profits, the figure rises to $1 trillion. Annually. The note did not say the revenue was impossible. It asked, in the way of banks, where it was. Investors, spooked, did not wait for the answer.
September had been the month when everything worked. Meta shares had surged roughly 36 percent since the launch of Muse, the personal AI assistant that overtook ChatGPT at the top of both the Apple and Google app stores — 2.8 million downloads in its first two weeks, according to Sensor Tower. Wall Street had already handed the company some $200 billion for the app, and the bulls had their story ready. “It’s logical that AI agents will become the front door to the internet for a lot of people, which puts the balance of power in Meta’s favour,” said Rob Biederman, co-founder and managing partner at Asymmetric Capital Partners.
On Thursday the company came within less than 1 percent of a $2 trillion market capitalization, a line crossed only by Apple, Microsoft, Nvidia and Alphabet. The note arrived the next day.
The Forbes ranking told the rest of it. Zuckerberg began Friday at No. 4 and ended it at No. 6, behind Sergey Brin at $259.9 billion and Michael Dell at $275.9 billion. Dell had the opposite kind of day — up more than $10 billion, the list’s biggest winner, lifted past both Zuckerberg and Brin. The next-worst loss after Zuckerberg’s belonged to Larry Ellison, at $1.6 billion, which is to say a fifth of it.
On paper, almost nothing happened. A stock down 4 percent after a month up 36. A man worth $257.5 billion instead of $266.4 billion. What happened was that someone said the number out loud — $300 billion a year, just to break even — and the front door to the internet swung a little on its hinges.