SK Hynix Posts Record AI Memory Profit But Shares Fall On High Expectations

SK Hynix has delivered the kind of AI memory earnings that would normally look impossible to criticise. Revenue jumped, operating profit hit a record and demand for high-bandwidth memory remains strong. Yet the stock still fell sharply because the AI chip market has reached a point where even record numbers can disappoint investors.

In its official Q2 2026 earnings materials, SK Hynix reported revenue of 79.3 trillion won, operating profit of 60.5 trillion won and a 76 percent operating margin. Net income reached 93.9 trillion won. Revenue rose 257 percent from a year earlier, while operating profit jumped 557 percent, driven by AI memory demand and higher prices for advanced products used in data centres.

Reuters reported via Investing.com that the results still missed market expectations, sending SK Hynix shares down nearly 10 percent. The Wall Street Journal noted that investors had expected even stronger revenue and operating profit, which shows how stretched expectations have become for companies tied to the AI buildout.

The irony is clear. SK Hynix is one of the biggest winners of the AI boom. Its high-bandwidth memory is critical for Nvidia’s accelerators and other AI systems that need fast memory beside the processor. GPUs get most of the public attention, but they cannot perform at full strength without the right memory stack. That has made SK Hynix, Samsung and Micron much more important to the AI supply chain than many casual investors understood two years ago.

The market reaction says less about weak demand and more about investor fear that AI-linked stocks have run too far. After months of gains, traders want perfect execution, stronger guidance and clearer evidence that margins can hold. SK Hynix says AI demand should remain strong, but investors are now asking whether memory pricing has reached a cyclical peak and whether Samsung, Micron or Chinese rivals such as CXMT could pressure margins later.

TechBooky’s recent article on CXMT’s huge Shanghai debut showed how China is trying to build its own DRAM champion as AI makes memory more strategic. That story sits directly beside SK Hynix’s earnings. The AI memory race is not only about near-term profits. It is becoming a geopolitical supply-chain fight involving Korea, China, Taiwan, Japan and the United States.

This also connects to the broader AI infrastructure spending story. TechBooky’s draft on Seagate’s AI storage-driven earnings showed how demand is moving beyond GPUs into storage. SK Hynix shows the same pressure in memory. Data centres need accelerators, memory, storage, networking and power at the same time, and each layer is now being judged by whether it can keep up with the AI buildout.

For SK Hynix, the earnings are still strong. The sell-off is the warning. AI infrastructure companies are no longer being rewarded just for exposure to the boom. They now have to beat very high expectations and convince investors that the cycle has more room to run. SK Hynix may still be at the centre of the AI memory story, but the market is making clear that the easy part of the rally is over.