KLA-Tencor (KLAC.US) experienced a sharp decline of 10% on Friday, closing at $1,513.01. The company reported fiscal second-quarter 2026 revenue of $3.3 billion and adjusted earnings per share of $8.85, both exceeding market expectations. However, the company's performance guidance for the third quarter failed to meet market expectations. KLA-Tencor's Q3 guidance projects revenue of approximately $3.35 billion, plus or minus $150 million. Non-GAAP diluted earnings per share are anticipated to be around $9.08, plus or minus $0.78. This guidance did not satisfy the market's anticipation for accelerated growth. The relatively moderate growth projection failed to demonstrate the strong acceleration expected from AI-driven demand. Market analysis widely attributes this divergence of "strong earnings but falling stock price" to investor concerns over KLA-Tencor's historically high valuation and wariness regarding the company's revenue growth rate, which has now decelerated for three consecutive quarters.