Shares of KLA Corporation tumbled -3.96% to $175.66 on September 10, extending a slide that began after management disclosed two concrete headwinds at the Citi Global Technology Conference on September 9: shortages of critical optical components and a 100-basis-point gross-margin drag from rising memory-related costs. KLA's Conference Candor Rattles Investors — But Is a 100-Basis-Point Margin Headwind Enough to Derail a $13 Billion Backlog?
Shares slid -3.96% to $175.66 after CFO Bren Higgins used the September 9 Citi Global TMT Conference to acknowledge two tangible soft spots in an otherwise bullish narrative: supply-chain limits in optical components and higher memory costs . The sell-off compounds a painful summer for KLAC, which hit a peak of $307 in early July and has since corrected roughly 40% .
• Optical Parts Shortage Caps What KLA Can Actually Ship KLA's inspection and measurement tools rely on precision lenses and light sources that few suppliers in the world produce. Higgins has noted that supply limitations — specifically long-lead components such as optics — are constraining growth "across many of our products." If KLA cannot secure enough optical components, booked orders sit in backlog rather than converting to revenue. That matters because backlog was just under $13 billion in early August, up 60% from fiscal 2025, with visibility into shipments through 2027 and into early 2028 . A record backlog is only valuable if the factory can deliver.
• A One-Percentage-Point Hit to Gross Margins Sounds Small — It Isn't
KLA warned that higher DRAM chip costs could trim roughly 75–100 basis points from 2026 gross margins . With September quarter revenue guided at $4 billion , every percentage point of gross margin represents about $40 million in profit. Full-year 2026 gross-margin guidance stands at 62%, slightly below analyst models that had projected 62.3% . For a stock that traded at a premium valuation, even a modest margin miss resets earnings expectations downward.
• The Growth Story Remains Intact — For Now Despite the margin noise, KLA said revenue grew 12% in 2024, 17% in 2025, and is expected to rise in the low-20% range in 2026 . Advanced packaging revenue grew 70% year over year, with KLA expecting its market share to reach 7%–8% in 2026 — up from just 2% in 2023. AI-driven demand for high-bandwidth memory and leading-edge chips continues to expand the need for KLA's defect-detection tools.
• The Real Question Is Whether the Street Overreacted
One commentary noted that gross margins may come in only about 25 basis points worse than expected — and yet the stock sold off sharply . With a Goldman Sachs conference appearance on Friday, management gets another chance to steady the narrative. Investors will be watching whether optical supply improves by year-end or whether KLA's record backlog remains stuck in limbo.