Rocky week for AI as shares slump but no sign of crash – yet

Traders work on the floor of the NYSE in New York Traders work on the floor at the New York Stock Exchange (NYSE) in New York City, U.S., June 22, 2026. REUTERS/Brendan McDermid Photograph: Brendan McDermid/Reuters View image in fullscreen Traders work on the floor of the NYSE in New York Traders work on the floor at the New York Stock Exchange (NYSE) in New York City, U.S., June 22, 2026. REUTERS/Brendan McDermid Photograph: Brendan McDermid/Reuters Rocky week for AI as shares slump but no sign of crash – yet The markets are souring on artificial intelligence, but is this the bubble being burst? Meanwhile, California proposes a tax on billionaires Hello, and welcome to TechScape. I’m Blake Montgomery, US tech editor at the Guardian, writing to you after fending off sunburns at the beach. Today, we’re discussing a rocky week for the AI industry’s finances and how California’s proposed billionaire’s tax is changing the political posture of the state’s governor. AI is facing a financial stress test, but the bubble hasn’t popped After the share prices of Alphabet, Samsung, and SK Hynix dropped, a global stock selloff caused markets worldwide to slump. The downturn is evidence of just how much the tech sector determines the globe’s economic fate. Warnings of a cataclysmic AI-induced crash haven’t come true yet, though. Last week, the stock market started souring on artificial intelligence. With AI touching just about every major stock, global markets soon suffered a downturn, and that slump has extended into this week. Is this the beginning of the end for AI, the bubble popping? I don’t think so. The drop started on 22 June with Alphabet, which saw its worst day on the market in over a year after a slew of high-profile leaders announced departures from Deepmind, Google’s elite AI research unit. A day later in South Korea, shares of chipmakers Samsung and SK Hynix dropped by double digits. Investors worried about two factors: both companies’ $500bn spending plans and signs of weakening demand for their high-bandwidth memory products from other players in the AI sector. The two companies make up half of the value of South Korea’s Kospi (Korea Composite Stock Price) Index, much like how seven companies make up 30% of the S&P 500 index in the US – meaning that they can tilt the country’s entire stock market and economy. Their precipitous drops last week triggered a halt on trading. In the US, the downturn may seem to spell doom, but it represents only a minor decline in comparison with the chip sector’s gains this year. The share price of some chip companies has tripled, or more, since January, driving entire stock markets sharply higher in Asia. Should the selloff of chip stocks continue, it may pop the ballooning global investment in AI. However, that will require a panic far more severe than what we’ve seen so far. As my colleague Graeme Wearden reports , the Kospi index is up 125% this year, its strongest first half since at least 1990. Though they’v