Taiwan's biggest passive-component maker, Yageo, is getting hit hard in the stock market even though the business itself looks stronger than ever, which is bad news for short-term shareholders but possibly a buying opportunity for long-term investors.

• Yageo's stock has dropped over 15% in three days, falling below a key price level, mostly because foreign investors are selling, not because the business is weakening.
• The company's sales jumped nearly 50% from a year ago, factories are running near full capacity, and a wave of price hikes for MLCC components (used heavily in AI chips) is boosting profits.
• Japanese and Korean competitors are also raising prices on AI-related parts, and analysts expect this pricing strength to continue into next year, which supports the case that Yageo's stock is undervalued compared to its Asian peers.
• The sell-off is part of a bigger storm: Taiwan's stock market has been sliding fast since hitting a record high, driven by a global tech and AI stock sell-off and heavy selling by foreign investors.
• Analysts say investors should watch two things going forward: whether demand for consumer electronics weakens, and how fast competitors can add new factory capacity, since both will decide if the price hikes keep sticking.

Outlook: If AI-related demand and pricing hold up, Yageo's business should keep improving even if its stock stays choppy in the near term, with the Taiwan market overall still at risk of more swings as AI stocks worldwide remain shaky.