On July 16, CIG Shanghai (06166.HK) declined 5.03% in regular trading, trading at 107.9 HKD/share, with turnover of approximately HKD 570 million. The optical communications sector came under broad pressure, with peer YOFC falling nearly 5% on the same day.

The pullback follows the company's H1 earnings preview released on July 14, which projected attributable net profit of RMB 310 million to RMB 359 million, representing a 157% to 197% year-over-year surge driven by robust demand for high-speed optical modules. The positive guidance had already pushed the stock up over 6% in the prior trading session on July 15, with today's retreat widely attributed to concentrated profit-taking after the catalyst was fully absorbed. Additionally, the company disclosed approximately RMB 202 million in foreign exchange losses for H1, partially eroding profitability. Sector valuations remain at historically elevated levels, sustaining selling pressure from accumulated gains.

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