What Happened?
A number of stocks fell in the afternoon session after the semiconductor sector pulled back amid fears that AI-driven chip demand may be cooling.
The broader Philadelphia Semiconductor Index plunged over 7%, dragging down chipmakers. The negative sentiment was amplified by a warning from a Citi analyst who questioned whether large cloud platforms would continue their high rate of spending on AI infrastructure if they could not show investors the cost was generating returns.
Additionally, reports of Meta's plan to sell access to its AI computing power sparked fears of future overcapacity in the industry. For two years the sector traded on an assumption of an insatiable GPU and memory shortage. If Meta, which guided to as much as $145 billion of capex for the year, has enough spare capacity to lease it out, the market reads that as a signal hyperscalers may have over-built, meaning future orders for GPUs, HBM and NAND could shrink.
A secondary catalyst pressured the Koreans specifically: reports that Apple was in talks to source chips from two Chinese suppliers, raising competitive and pricing fears. Underlying all of it is profit-taking.
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:
- Memory Semiconductors company Western Digital NASDAQ:WDC fell 10.4%. Is now the time to buy Western Digital?
- Analog Semiconductors company MACOM NASDAQ:MTSI fell 10.4%. Is now the time to buy MACOM?
- Processors and Graphics Chips company Lattice Semiconductor NASDAQ:LSCC fell 9.9%. Is now the time to buy Lattice Semiconductor?
Zooming In On MACOM (MTSI)
MACOM’s shares are very volatile and have had 27 moves greater than 5% over the last year. But moves this big are rare even for MACOM and indicate this news significantly impacted the market’s perception of the business.
The previous big move we wrote about was 9 days ago when the stock dropped 7.2% on the news that a report that South Korea's SK Hynix is slowing its high-bandwidth memory (HBM) expansion rattled the AI-chip complex.
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.
MACOM is up 80.7% since the beginning of the year, but at $316.09 per share, it is still trading 22.8% below its 52-week high of $409.68 from May 2026. Investors who bought $1,000 worth of MACOM’s shares 5 years ago would now be looking at an investment worth $5,054.
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