Lam Research warned China sales will fall; Qnity, down 9.5% with China a third of revenue, reports Nov. 4

The polishing pad is the quiet item on the wafer line. Qnity Electronics▼−0.25% — Qnity Electronics, down 0.25 percent today (NYSE: Q), the semiconductor materials business DuPont▲+0.60% — DuPont, up 0.60 percent today spun off in autumn 2025, sells the chemical mechanical planarization pads, slurries and photolithography chemistries that fabs consume on every wafer they run ³. Revenue tied to wafer output rather than to one-time equipment purchases is likely why a warning from an equipment maker hit the stock so hard this week: consumables follow what fabs actually produce, so a demand signal lands there as well as on the toolmakers. ³

Lam's warning moved the whole supply chain

The warning came from Lam Research▲+0.47% — Lam Research, up 0.47 percent today on October 21 ³. Lam posted record September-quarter revenue of $8.22 billion↗, up 54% year over year, but guided December-quarter revenue to $8.6 billion with two caveats: supply constraints were holding results back, and China sales will fall meaningfully ³. On October 22 the supply chain sold off: Applied Materials▲+1.31% — Applied Materials, up 1.31 percent today down 6%, ASML▲+0.84% — ASML, up 0.84 percent today down 3%, Marvell▲+2.12% — Marvell, up 2.12 percent today down 9.40%, Astera Labs▲+1.18% — Astera Labs, up 1.18 percent today down 10.83%, and Lam down 9.04%, all in morning trading ³. Qnity closed down 9.48% at $108.78↗ ², leaving it 36.1% below its June 22 high of $177.28. ³

Why a third of the revenue base sits in one region

The warning reaches Qnity directly through its own numbers. Asia-Pacific is close to four-fifths of revenue↗, China contributes roughly a third, and the largest customers are Samsung and TSMC▲+1.22% — TSMC, up 1.22 percent today ¹. Pads and slurries are consumed per wafer, so a Chinese pullback in wafer starts flows into Qnity's consumables revenue with a lag and no cushion. Net debt of about $3 billion sharpens the exposure. ¹

The complication: Lam said its problem was supply, not demand, and a China decline, not a global one. And Qnity's Q2 was strong ^{1 3}. Revenue rose 22% year over year to $1.43 billion, adjusted EPS of $1.19 beat the $1.07 consensus, and management raised 2026 guidance to $5.55 to 5.65 billion of revenue and $4.40 to $4.60 of adjusted EPS. ^{1 3}

But the growth did not reach the bottom line: net profit fell 34% to $124 million and operating cash flow fell 11.7% to $241 million even as revenue climbed ². Costs are rising faster than sales, which leaves less room to absorb a demand shock. ²

Apple buys the films, without a price tag

There is an American offset, though it carries no price tag. On October 20, Apple▼−0.45% — Apple, down 0.45 percent today named Qnity a partner in its American Manufacturing Program↗, producing the specialty films for the iPhone 18 Pro's variable-aperture camera system ^{4 5}. Apple pledged up to $100 million over three years to the titanium partner, Perryman; for Qnity it named no figure at all. ^{4 5}

The November 4 print settles it

Qnity reports Q3 before the open on November 4, with consensus at $1.20 adjusted EPS on $1.49 billion of revenue ^{2 3}. Two numbers in that report decide it: whether China revenue holds against Lam's warning, and whether fab utilization at its biggest customers stays high enough to keep consumables volumes growing. Anyone buying the 36%-off stock into the print should size the position for a third of the revenue base sitting in one region. ^{1 2 3}