Trump administration drafts ban on Chinese data center components, triggering a stock plunge in China and a rally in the US

Aug 5, 2026

The Trump administration is drafting a ban on importing next-generation Chinese optical transceiver modules, citing cybersecurity risks to U.S. AI infrastructure. The news triggered a sharp market divergence on August 4-5, 2026. U.S. optical suppliers like Applied Optoelectronics and Coherent rallied up to 20%, while Chinese exporters like Zhongji Innolight and Eoptolink plummeted around 10%. Analysts suggest the move may be a negotiating tactic ahead of bilateral talks in September.

Chinese data center component ban

▪The U.S. Federal Communications Commission is leading the formulation of the import ban to protect U.S. artificial intelligence infrastructure from cybersecurity and data leakage threats.
▪The Trump administration is drafting new regulations to ban U.S. data centers from importing next-generation Chinese-made optical transceiver modules.

US-China trade negotiation tactics

▪Jefferies stated that the proposed ban is a U.S. negotiation tactic ahead of Chinese President Xi Jinping's planned visit to the U.S. in September 2026.
▪Jefferies pointed to China's rare earth export controls, which affect the U.S. optics industry, as a factor in the geopolitical negotiating dynamics.

Chinese optical module stock plunge

▪Shares of Eoptolink Technology fell between 7% and 11% on August 5, 2026, amid the market selloff.
▪Shares of Zhongji Innolight fell approximately 10% in both Shanghai and Hong Kong trading following the news of the drafted U.S. restrictions.
▪Suzhou TFC Optical Communications shares declined between 3.5% and 6% following the reports.
▪The CSI300 Telecommunication Services Index tumbled as much as 9% in early trading on August 5, 2026, following reports of the proposed U.S. import ban.

US optical maker stock rally

▪On August 4, 2026, Applied Optoelectronics stock surged over 20% and Coherent stock rose about 18% following reports of the planned import ban.
▪Lumentum shares surged nearly 14% and Corning shares rose nearly 8% on August 4, 2026, as investors anticipated U.S. cloud providers shifting orders to domestic suppliers.

Chinese company export dependence

▪Zhongji Innolight generated 62% of its first-quarter revenue in 2026 from the U.S. market.
▪Eoptolink Technology generates 96% of its sales from overseas markets, leaving it heavily exposed to international trade restrictions.