What Happened?
A number of stocks fell in the afternoon session after a report that South Korea's SK Hynix is slowing its high-bandwidth memory (HBM) expansion rattled the AI-chip complex.
The selling started in Asia as SK Hynix and Samsung each dropped more than 12%, dragging the KOSPI down about 10% and triggering a 20-minute market-wide circuit breaker, then carried into Europe (ASML −5%, Infineon, ASM International and STMicroelectronics down 5–8%) and the U.S., where the Philadelphia Semiconductor Index opened down roughly 7% a day after closing at a record high.
The headline sounds bearish for AI, but the underlying report is a margin story, not a demand story. SK Hynix is deliberately slowing its HBM4 ramp to redirect capacity into conventional DRAM, where shortages have pushed operating margins above HBM's. Korean analysts pegged the margin gap at more than 15 points.
HBM is the memory bolted onto Nvidia's AI accelerators, so any "slowing HBM" signal instinctively sparks fears the AI build-out is cooling which is why the reflex was to sell.
The more accurate read is that all three memory makers are running the market tight (Samsung flagged a 146% DRAM ASP jump in Q1, SK Hynix mid-60%), keeping pricing power with sellers.
The bigger driver appeared like profit-taking after a parabolic run. Micron rose ~300% since the start of the year, colliding with a hawkish rate shift: traders pricing 50bps of Fed hikes by December under new Chair Kevin Warsh, making debt-funded AI capex harder to justify at record valuations. The divergence confirmed it: memory names took the brunt (Micron −11%) while logic-heavy Nvidia fell only ~3.6%. Wedbush framed the drop as a buying opportunity with enterprise demand intact.
The stock market overreacts to news, and big price drops can present good opportunities to buy high-quality stocks.
Among others, the following stocks were impacted:
- Semiconductor Manufacturing company Marvell Technology (NASDAQ: MRVL) fell 8.1%. Is now the time to buy Marvell Technology? Access our full analysis report here, it’s free.
- Analog Semiconductors company Himax (NASDAQ: HIMX) fell 7.4%. Is now the time to buy Himax? Access our full analysis report here, it’s free.
- Semiconductor Manufacturing company IPG Photonics (NASDAQ: IPGP) fell 8%. Is now the time to buy IPG Photonics? Access our full analysis report here, it’s free.
Zooming In On Marvell Technology (MRVL)
Marvell Technology’s shares are extremely volatile and have had 42 moves greater than 5% over the last year. In that context, today’s move indicates the market considers this news meaningful but not something that would fundamentally change its perception of the business.
The previous big move we wrote about was 5 days ago when the stock gained 12.7% on the news that the company highlighted several positive developments, including plans to use TSMC's next-generation 1.4-nanometer chip technology, a major shipment milestone, and its upcoming inclusion in the S&P 500 index.
A report from Nikkei Asia stated Marvell plans to use Taiwan Semiconductor's advanced manufacturing process for its future AI chips, reinforcing the company's growth narrative.
Additionally, Marvell announced it had shipped over five million coherent photonic integrated circuits, developed with Tower Semiconductor, to address component shortages in the data center market. These developments occurred ahead of Marvell's scheduled entry into the S&P 500 index. In response to the news, B. Riley raised its price target on the stock, citing the S&P 500 catalyst and a deepening collaboration with Nvidia.
Marvell Technology is up 214% since the beginning of the year, but at $281.11 per share, it is still trading 11.2% below its 52-week high of $316.43 from June 2026. Investors who bought $1,000 worth of Marvell Technology’s shares 5 years ago would now be looking at an investment worth $5,155.
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