YOFC's stock price plummeted 17.31% during intraday trading on Thursday, reflecting significant investor concern over the company's outlook.

The sharp decline follows the company's annual shareholder meeting held earlier this week, where management expressed cautious views on the timing of capacity expansion. CEO Zhuang Dan acknowledged that whether current favorable market conditions can be sustained is a shared concern among shareholders, stating that the supply-demand balance will determine how long the current fiber shortage persists.

Market sentiment was further pressured by news of multiple competitors launching preform expansion plans, which could intensify market competition. Analyst warnings about potential margin pressure if new entrants successfully develop high-end fiber products, combined with concerns that Corning's new GlassBridge optical interconnect platform might erode long-term demand for midstream fiber components, prompted investors to reassess the company's valuation.