The London market is nursing a nasty hangover this morning, as fears of an AI stock bubble send shivers through the Square Mile. The FTSE 100 opened sharply lower, dragged down by heavy selling in technology shares. The trigger? A stark warning from the Financial Conduct Authority that valuations in the artificial intelligence sector have become “detached from fundamentals”. This is not mere jawboning: the FCA’s executive director of markets, Clare Cole, told a gathering of asset managers yesterday that the regulator is “monitoring the build-up of leverage and speculative activity in AI-related equities with increasing concern”. Her comments landed like a bucket of cold water on a market that has been pricing in perfection for months.
The numbers are, frankly, absurd. Nvidia, the poster child of the AI revolution, now trades at over 40 times forward earnings. Its UK-listed peers are not far behind. BAE Systems, which has been riding the AI defence wave, commands a multiple that would make a growth stock blush. Even ARM Holdings, the Cambridge darling, is priced for a decade of uninterrupted miracles. The market is discounting the future with a vigour that suggests it has forgotten about competition, regulation, and the simple fact that most AI start-ups will never turn a profit. We have seen this movie before. It ended with tears in 2000, and again in 2021.
What makes this episode particularly dangerous is the sheer amount of cheap money that has been thrown at the sector. Central banks, despite tightening, have kept liquidity abundant. The Bank of England’s quantitative tightening has been tentative at best, leaving a wall of cash searching for yield. And where does it go? Into the next big thing. AI is the story du jour, and the narrative is intoxicating. But behind the headlines, the reality is more prosaic. Many AI firms are burning cash to acquire customers, capitalising R&D, and relying on dilutive secondary offerings to stay afloat. The emperor has no clothes, but the market is too busy buying lottery tickets to notice.
The gilt market has taken note. The yield on the 10-year Gilt has nudged higher this morning, reflecting a risk-off shift as investors reassess the likelihood of a sharp correction. A collapse in tech valuations would not be contained to one sector. It would spill over into broader equity markets, hurting pension funds and retail investors alike. The FCA’s warning, therefore, is not just about investor protection but financial stability. The last thing the British economy needs is a wealth effect reversal that chokes off the tentative recovery in consumer spending.
The irony is that AI is genuinely transformative. It will revolutionise productivity, streamline logistics, and even write creditable financial commentary. But that does not justify today’s valuations. The market is pricing in a future where every company is a winner, every deployment is a success, and no regulation ever bites. This is a fantasy. The history of technology investing is littered with the corpses of pioneers who were right about the trend but wrong about the timing. The internet changed the world, but the dot-com crash wiped out trillions before the real winners emerged. The same will happen with AI.
So what should the prudent investor do? First, ignore the hype. Second, look at cash flows and balance sheets. Third, remember that the best time to buy was when everyone was scared, not when everyone is euphoric. The FCA is right to sound the alarm. The question is whether the market will listen before the bubble bursts, or after.
