Chip Stocks Slide as Wall Street Rethinks AI Trade Without Huang

The PHLX Semiconductor Index jumped 10.6% in the first four days of the week after news broke that Nvidia's board had opened an investigation into a relationship involving former CEO Jensen Huang. By the end of that run, investors were no longer sure the gain would stick. AMD and other chip stocks slid as Wall Street reassessed what the AI trade looks like without Huang at Nvidia's helm.

The initial logic was simple. A potentially weaker Nvidia could mean more openings for its direct rivals in the chip market. Suppliers, meanwhile, might gain pricing leverage against a company that analysts have described as the "central bank of AI." For four trading days, that thesis printed money: the SOX index climbed 10.6%.

Then the mood turned.

What changed for Nvidia and its rivals?

Two developments drove the week. First, news broke over the weekend that Nvidia's NVDA board of directors had launched an investigation into whether one of former CEO Jensen Huang's relationships compromised business secrets. Second, Huang resigned as Nvidia's chief executive on Thursday morning.

At first, it looked like Nvidia's pain might be the rest of the chip sector's gain, as investors bet that a weakened Nvidia would reshuffle competitive positions across semiconductors. But now, investors aren't so sure.

The reassessment hit AMD and other chip stocks directly. Shares slid as traders unwound the idea that Nvidia's troubles automatically translate into wins for its competitors.

Analysts now warn the opposite could hold. Nvidia, they say, could scale back its status as the 'central bank of AI' — and that could have repercussions across the tech sector, not just among chipmakers. If Nvidia pulls back from its central role in supplying the AI buildout, the effects would ripple outward to companies that have leaned on its momentum.

Why does the 'central bank of AI' framing matter?

The label captures Nvidia's outsized position in the AI economy. The company's hardware and software sit at the center of the industry's spending, much as a central bank sits at the center of a financial system. Nvidia's decisions on supply, pricing and partnerships shape fortunes far beyond its own revenue line.

That is why Huang's exit carries weight beyond one company's boardroom. Huang resigned Thursday morning, days after the weekend news of the board's investigation into whether one of his relationships compromised business secrets. The combination of a leadership vacuum and an active probe has forced investors to price in uncertainty they had largely ignored.

For rivals like AMD, that uncertainty cuts both ways. A diminished Nvidia could open market share. It could also chill the entire AI trade that has lifted semiconductor valuations.

What happens next for chip investors?

The 10.6% SOX surge showed how quickly capital moved on the initial read. The subsequent slide in AMD and other chip names showed how quickly that read broke down.

Wall Street is now repricing the sector on two questions it can't yet answer: how much the board's investigation will constrain Nvidia, and whether a Nvidia that scales back its 'central bank' role leaves the broader tech sector richer or poorer.

Until those answers arrive, expect chip stocks to trade on speculation rather than fundamentals — and expect every Nvidia headline to move the whole sector with it.