Yardeni Warns of Irrational Exuberance in Chip Stocks
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Prominent Wall Street bull Ed Yardeni now questions whether analyst consensus on chip-stock earnings growth reflects irrational exuberance. With Lam Research's warning triggering a broad sell-off and the SOX index down over 25% from its June high, even the most committed bulls are cooling — the earnings re-rating may just be starting.
Why is a long-time bull suddenly sounding the alarm?
Ed Yardeni — one of Wall Street's best-known bullish strategists — wrote in his latest note that analyst consensus on long-term earnings growth for chip stocks shows signs of "irrational exuberance."
His core argument: today's outsized profits rest on a supply-demand imbalance, but as capacity expands, expecting current pricing power and margins to hold looks too optimistic.
This means → when even a committed bull stops believing "chips can keep earning this much," confidence in the earnings consensus is cracking.
How much did chip stocks gain — and how much have they given back?
On the way up: the iShares Semiconductor ETF rose nearly 60% year-to-date; Micron Technology surged over 200%, making it the S&P 500's fourth-best performer; the Roundhill DRAM ETF gained 65% since its April launch.
On the way down: the Philadelphia Semiconductor Index (SOX) has fallen more than 25% from its June record high and 14% in the past month alone; the Roundhill DRAM ETF is down nearly 45% from its peak.
In plain terms = the ride up was a rocket; the ride down is just as violent — the highest flyers are falling the hardest.
Why did Lam Research's earnings call become the trigger?
Lam Research CEO Tim Archer warned on the earnings call that heading into 2027, component constraints in the supply chain will continue to limit chipmakers' and equipment firms' ability to meet end-demand.
The stock plunged more than 10% in a single session, dragging peers Applied Materials and KLA lower in tandem.
This means → the parts shortage is a double-edged sword for equipment makers — chip price increases help manufacturers, but equipment firms themselves "can't ship what they can't build," capping their own revenue.
Shouldn't a chip shortage be good for chip stocks? What is the market afraid of?
BCA Research strategist Jonathan LaBerge noted that there are no signs the chip shortage is easing, suggesting the recent pullback may be temporary.
But the market's bigger fear lies elsewhere — slowing demand. Tikehau Capital's Raphaël Thuin told *Barron's* that investor appetite for AI risk is now far lower than it was just weeks ago.
Edward Jones economist James McCann added that the market is demanding more proof of returns on heavy AI spending, while questioning whether such spending can continue as interest rates rise.
In plain terms = supply constraints do prop up prices, but if buyers start asking "is this really worth it," no price level holds without a willing buyer.
Is the earnings re-rating only just beginning?
Yardeni's warning carries weight precisely because he is a long-time bull — when the most optimistic voice starts questioning, the consensus is shifting.
This reflects a deeper issue: of the past year's chip-stock surge, how much was fundamental — and how much was the market pricing in the AI narrative ahead of proof?
This means → if AI investment returns keep failing to materialize, chip-stock earnings expectations could face a systematic downgrade — not just a short-term correction.
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