YOFC shares plunged 5.12% during intraday trading on Thursday, extending a pullback as investors locked in profits following the previous session's dramatic V-shaped rally of over 16%. The sharp decline reflects weakening momentum in the communications equipment sector after a period of heightened volatility.

The sell-off was compounded by lingering uncertainty over potential US trade restrictions. Market sentiment remains cautious amid reports that the US Federal Communications Commission is considering measures to ban imports of new Chinese optical module models. While institutions have noted that a blanket restriction remains highly unlikely due to the deeply globalized optical communications supply chain, residual concerns continue to weigh on the sector, with key peers also trading lower.

YOFC, a leading Chinese provider of optical fiber preforms, cables, and related communications products, serves both domestic and international markets. The stock's retreat underscores the fragile investor confidence in the face of regulatory headlines and profit-taking after sharp gains.