Zhongji Innolight and Eoptolink plunged 20% in the call auction.

Zhongji Innolight (300308.SZ) and Eoptolink (300502.SZ), two leading Chinese optical-module makers, both plunged 20% during A-share call auction trading on November 6, with Zhongji Innolight quoted at 394.67 yuan and Eoptolink at 148.49 yuan. The sharp drop hit the sector's two most prominent names simultaneously at the pre-open stage, signaling a broad reassessment of optical-module stocks rather than an issue specific to one company. The move matters because both firms are core suppliers tied to AI data-center demand, making them bellwethers for the AI hardware supply chain. Investors will watch whether the auction losses carry into the continuous session and whether the selloff spreads to other optical-component and AI-infrastructure names.