KLA-Tencor's stock experienced a significant intraday plummet of 11.60% on Friday. The sharp decline followed the release of the company's fiscal second-quarter financial results, which were reported after the previous trading session's close.

Despite reporting quarterly revenue of $3.30 billion and adjusted earnings per share of $8.85, both exceeding market expectations, the stock price declined sharply. Market analysis indicates the sell-off was driven by investor disappointment with the company's forward guidance for the third quarter, which failed to meet market hopes for accelerated growth fueled by AI-driven demand.

Additional factors contributing to the negative sentiment include investor profit-taking after the stock's rapid appreciation and concerns over KLA's historically high valuation. Analysts also noted the company's revenue growth rate has slowed for three consecutive quarters, leading the market to reassess the company's future growth resilience amid cyclical fluctuations in the semiconductor industry.