Why Chipmakers Are Having a Brutal July

The sell-off in global chip stocks that began last week is getting worse. South Korea's Kospi fell more than 10% on Tuesday, prompting a brief trading halt. The Nasdaq is down again. And some of the biggest names in semiconductors have lost a third of their value in July alone, even as they remain dramatically higher for the year.

The stocks that powered markets to record highs in the first half of the year are now dragging them down.

Here's what's behind it.

Three Things Spooking Investors

For the first half of 2026, chipmakers were the darlings of global markets. The logic was this: AI needs chips, AI spending is growing fast, therefore chip companies win. SK Hynix, Samsung, Kioxia, Nvidia, Micron, and others all saw extraordinary gains.

But now, investors are asking harder questions.

AI spending is being questioned. Alphabet's share price fell 7% last week after Google reported burning through enormous amounts of cash on AI infrastructure in the second quarter. Investors are growing nervous about whether the scale of AI capital expenditure can be justified by future returns. Microsoft, Meta, Amazon, and Apple all report earnings this week, and the same question hangs over all of them.

Oversupply concerns are building. SK Hynix and Samsung have both announced plans to build two new chip plants each in South Korea, part of a combined $548 billion investment to double their DRAM production capacity over five years. More supply coming online is good news in the long run but creates a ceiling on prices in the near term, and investors are starting to price that in.

Chinese AI competition is rattling confidence. Chinese AI startup Moonshot released a large language model last week that appeared to rival systems from leading Western labs. That's significant because part of the investment case for US chip companies rests on the assumption that frontier AI development stays concentrated in the US, requiring the most advanced chips that only a few firms can produce. If Chinese labs can build competitive models using less advanced hardware, investors have to rethink how much cutting-edge chip capacity the world really needs.

The question is whether the sell-off represents a healthy correction after an extraordinary run, or the beginning of something more structural.

What to Watch This Week

The next few days will be important.

Microsoft, Meta, Amazon, and Apple all report earnings this week, and the chip trade depends heavily on how much these hyperscalers say they plan to keep spending on AI infrastructure. If they signal continued aggressive investment, that could stabilise semiconductor sentiment. If they pull back or flag concerns, the selloff could deepen.

The Federal Reserve also meets on Wednesday. Markets expect rates to stay on hold, but investors will be watching new chair Kevin Warsh's press conference closely for any signals about the path forward. A rate hike in September is currently priced in by futures markets, which adds another layer of pressure on highly valued growth stocks.

What This Means for Investors

If you hold global equity funds or technology ETFs, you're feeling this week. The chip sector has been one of the biggest drivers of returns in 2026, so a sustained sell-off has real portfolio implications.

But, the companies caught up in this selloff haven't fundamentally changed in the past few weeks. Demand for AI chips remains strong, and the buildout of data centres and AI infrastructure is continuing. What's changed is the price investors were willing to pay for future earnings, and the growing recognition that some of those prices had become difficult to justify.

Several analysts are calling this a buying opportunity. Others warn the spiral could continue through earnings season. The honest answer is that nobody knows which it is yet, and that's exactly why a diversified portfolio matters more than a view on where chips go next.