Applied Materials (AMAT) shares fall amid HBM supply-tightness pullback.

Shares of semiconductor machinery manufacturer Applied Materials fell 11.2% in the afternoon session after the company was caught in a broader sell-off among semiconductor stocks as investors took profits following a record-breaking first half for the sector. The downturn was widespread across the chip industry, which had seen the VanEck Semiconductor ETF gain 82% in the first six months of 2026, with investors appearing to use the start of the second half of the year to lock in substantial gains.

Applied Materials's shares are highly volatile, with 27 moves greater than 5% over the last year. However, moves this large are rare even for the company and indicate this news significantly impacted the market's perception of the business. The previous major move occurred 8 days prior, when the stock dropped 8.3% on reports that South Korea's SK Hynix was slowing its high-bandwidth memory (HBM) expansion, which rattled the broader AI-chip complex.

The selling initiated in Asia as SK Hynix and Samsung each dropped more than 12%, dragging the KOSPI down approximately 10% and triggering a 20-minute market-wide circuit breaker. The downturn carried into Europe, where ASML fell 5% and Infineon, ASM International, and STMicroelectronics declined 5–8%, before reaching the U.S., where the Philadelphia Semiconductor Index opened down roughly 7% a day after closing at a record high.

While the headline appeared bearish for AI, the underlying report represented a margin story rather than a demand issue. 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 percentage points. Because HBM is the memory bolted onto Nvidia's AI accelerators, any "slowing HBM" signal instinctively sparked fears that the AI build-out was cooling, explaining the reflex to sell.

The more accurate interpretation is that all three memory makers are running the market tight, with Samsung flagging a 146% DRAM ASP jump in Q1 and SK Hynix reporting mid-60% increases, keeping pricing power with sellers. The bigger driver appeared to be profit-taking after a parabolic run. Micron rose approximately 300% since the start of the year, colliding with a hawkish rate shift as traders priced in 50 basis points of Federal Reserve hikes by December under new Chair Kevin Warsh, making debt-funded AI capex harder to justify at record valuations.

The divergence confirmed the profit-taking narrative: memory names took the brunt with Micron down 11%, while logic-heavy Nvidia fell only approximately 3.6%. Wedbush framed the drop as a buying opportunity with enterprise demand remaining intact.

Applied Materials is up 139% since the beginning of the year and at $642.37 per share has set a new 52-week high. Investors who purchased $1,000 worth of Applied Materials shares 5 years ago would now be looking at an investment worth $4,657.