Ultrasound Electronics said on September 13 that its shares had risen by a cumulative more than 20% over the two trading days of September 10 and September 11, triggering abnormal trading volatility. The company denied a market rumor that its high-frequency board had passed Nvidia certification and said it currently has no products supplied to Nvidia, according to Jiemian News. It added that PCB products for 800G and 1.6T optical modules are still in the R&D follow-up stage, with future progress, customer certification and mass production all uncertain. The company said the products have not yet achieved scaled shipments and have generated no related revenue so far. It also said its fundamentals have not changed materially, despite improved market expectations for demand for upstream PCB and copper-clad laminate products in the consumer electronics supply chain.