PHLX Semiconductor Index plunges 10%, marking worst day in 6 years

The Philadelphia Semiconductor Index, better known as SOX, cratered 10.26% on June 5, erasing over $1 trillion in market capitalization from chip stocks in a single trading session. It was the index’s worst day since March 2020, when pandemic panic was doing the damage.

SOX had surged nearly 70% year-to-date heading into June 5, riding a wave of artificial intelligence euphoria that sent semiconductor valuations into the stratosphere. Disappointing quarterly earnings, particularly from Broadcom, gave investors the excuse they’d been looking for to hit the sell button. Rising Treasury yields poured gasoline on the fire.

The carnage wasn’t contained to chips. The Nasdaq Composite fell 4.18%, while the S&P 500 dropped 2.64%. But semiconductor stocks bore the brunt of the punishment by a wide margin.

The damage report

Marvell Technology led the bleeding, plunging 16.74%. Micron wasn’t far behind at 13.25%. ARM Holdings dropped 12.84%, Intel shed 11.28%, and AMD fell 10.86%.

How we got here

A 70% year-to-date gain in an entire sector index isn’t normal. It’s the kind of run that happens when a transformative technology narrative, in this case generative AI, convinces the market that demand for chips will be functionally infinite.

When Broadcom’s quarterly results came in below expectations, it punctured the narrative just enough. Investors who had been riding momentum suddenly had a reason to question whether the AI spending cycle would deliver returns as quickly or as profitably as the market had assumed.

Rising Treasury yields added a second layer of pressure. Higher yields make future earnings less valuable in present-dollar terms, which hits growth stocks particularly hard.

What this means for investors

The last time SOX had a day this bad was March 2020, and that turned out to be the start of one of the greatest semiconductor rallies in history. But the setup was different then. Valuations were lower, interest rates were heading to zero, and massive fiscal stimulus was about to flood the economy.

Today’s environment is almost the mirror opposite. Valuations coming into this sell-off were stretched by virtually any historical metric. Treasury yields are elevated. And while AI spending remains robust, the quarterly earnings cycle is starting to separate companies delivering real revenue from those still trading on hope.

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