Cambridge Industries Group (CIG) saw its stock price plummet 5.11% during intraday trading on Thursday, extending a recent downward trend for the optical communications company.

The decline comes as the optical communications sector faces sustained selling pressure, with investors taking profits after significant year-to-date gains that pushed valuations to relatively elevated levels. Broader industry concerns have been fueled by disappointing results from key sector peers, including YOFC's first-quarter net profit that significantly missed market expectations and optical module giant Lumentum posting revenue slightly below analyst consensus.

Despite CIG's recent strong quarterly performance with revenue up 43.98% year-over-year and net profit surging 276.44%, and the company's assurance that high-speed optical module orders remain robust with active expansion of production capacity, the stock has continued to track the broader sector adjustment that began several trading days ago.