29 January 2025 — The $600 Billion Shock: How One AI App Shook Nvidia’s Story

Over the weekend of 25–26 January, technology enthusiasts began sharing screenshots of a new Chinese AI chatbot called DeepSeek. The headline claim: it had been built for just $5.6 million — less than many American AI projects spend on a week’s electricity — and yet answers questions about as well as ChatGPT.¹ By Monday morning, DeepSeek was the most-downloaded free app on Apple’s U.S. App Store. By Monday afternoon, it had triggered the largest single-day loss of value by any company in stock-market history. Nvidia fell 17%, wiping out almost $600 billion.² The broader market took a $1 trillion haircut.

The logic is simple. For two years, the story told to investors has been that powerful AI requires enormous amounts of Nvidia’s expensive chips. The entire multi-trillion-dollar rally in AI-related shares rests on that story. DeepSeek threatens to punch a hole in it. If a modest Chinese team can produce a world-class model on a shoestring, perhaps “smarter software” can substitute for “more chips” — and the American tech giants may be about to waste vast sums on data centres they are already building.

Look carefully and the reaction is partially overdone. DeepSeek was built using Nvidia chips — a stockpile acquired before U.S. export restrictions tightened. Far from proving the chips unnecessary, it has proved them capable even in smaller numbers. Nvidia’s Monday-evening statement noted that commercial-scale use still requires “significant numbers of NVIDIA GPUs.”¹ OpenAI’s Sam Altman courteously called DeepSeek “an impressive model.”³ Trump, a week into his second term, struck a competitive note: “This should be a wake-up call for our industries that we need to be laser-focused on competing to win.”⁴ His administration has just announced a $500 billion AI initiative called “Stargate” with OpenAI, SoftBank and Oracle.

Because the big tech firms account for such a huge slice of U.S. indices, the shock has cascaded. Broadcom fell 17% on Monday. Marvell fell 19%. The Philadelphia Semiconductor Index had its worst day since March 2020. Interestingly, the Dow Jones actually rose slightly — as the Magnificent Seven have grown, the “rest” of the market has quietly become less dependent on them.

Three lessons. The fragility of a narrative matters as much as the numbers: Nvidia’s earnings are as strong as ever, yet the share price fell 17% because a story appeared threatening its dominance. Concentration cuts both ways — 30% of the “diversified” S&P 500 is effectively a bet on the same handful of stories. And panic sales are rarely the right answer: the question today is whether the long-term case has genuinely changed. For most companies, it has not.