The market is having a moment of clarity, and it is not pretty. The AI stock bubble, inflated by promises of revolutionary productivity and endless free cash flow, is showing signs of deflation faster than a punctured Lilo. In the past 48 hours, the tech-heavy Nasdaq has shed nearly 4 per cent, with heavyweights like Nvidia and Palantir bearing the brunt. The sell-off has triggered a flight to safety, pushing the yield on the 10-year gilt up 12 basis points to 4.03 per cent. This is not a blip. This is the market waking up to the hangover after a decade of cheap money and speculative excess.
Let us be clear: the AI trade has been fuelled by a dangerous cocktail of central bank liquidity and narrative-driven investing. The Bank of England, like its counterparts, has kept rates lower for longer than prudence would dictate, flooding the system with cheap credit that inevitably found its way into long-duration tech stocks with dubious cash flows. The result? A market capitalisation for the 'Magnificent Seven' that rivals the entire FTSE 100. This was never sustainable. The share prices of these AI darlings have been divorced from earnings potential for quarters, trading at multiples that would make a Victorian railway bubble look like a prudent investment.
Now the reckoning is here. The catalyst: a surprisingly hawkish speech from the BoE's chief economist, who hinted that inflation is proving stickier than expected, requiring higher for longer rates. That is the last thing AI stocks need. Their valuations depend on discounting distant future cash flows. When rates rise, those distant cash flows become worth considerably less today. Gilt yields, the benchmark for risk-free returns, are now competing directly with equity risk premiums. Why take a punt on a speculative AI firm when you can earn 4 per cent risk-free from a gilt? The sell-off is rational. It is a correction that should have happened months ago.
The Capital Flight Index, which I track religiously, is flashing red. We are seeing outflows from tech ETFs into money market funds at the fastest pace since the 2022 sell-off. The City’s ‘smart money’ is rotating into defensive sectors: utilities, healthcare, and consumer staples. The chatter in the Square Mile is that the AI story is not dead, but it is certainly taking a breather. The 'democratisation of AI' narrative, which had retail investors piling into anything with an AI ticker, is losing its grip. When the FOMO evaporates, the floor can become a trapdoor.
The government’s fiscal stance does not help. The Chancellor’s recent spending commitments, funded by increased borrowing, are adding to the supply of gilts and putting upward pressure on yields. A higher debt servicing cost crowds out private investment and puts the BoE in a bind. If they cut rates to placate the market, they risk stoking inflation further. If they hold, they risk a full-blown crash in overvalued assets. This is the policy straitjacket that years of fiscal and monetary incontinence have created.
So, what is a sensible investor to do? I have been advising clients to reduce exposure to high-growth tech and increase allocations to inflation-linked gilts and cash. War bonds are a safe haven. Do not be seduced by the dip. The AI bubble may not burst entirely, but the air is hissing out. Price-to-earnings ratios need to compress further before this market can find a floor. The lesson from history is that when the crowd is euphoric about a new technology, the profits are made in the later stages of the cycle, not during the initial hype. Patience and a strong stomach for volatility will be rewarded.
In the short term, expect more turbulence. The AI sell-off will test the resilience of the broader market. If the FTSE 100, heavy with old-economy stocks, can hold its ground, it will be a sign that the rot is contained. But if contagion spreads, we could be looking at a longer and deeper correction. The City is urging calm, but I am urging caution. The bottom line is that markets are finally pricing in reality. It is about time.
