Defendant
1 case as defendant.
United Microelectronics Corporation (UMC) is a leading global pure-play semiconductor foundry headquartered in Hsinchu, Taiwan, and was founded in 1980. The company is publicly traded on the New York Stock Exchange (NYSE: UMC) and the Taiwan Stock Exchange (TWSE: 2303). As of late 2025/early 2026, UMC employs approximately 19,000 to 20,000 people worldwide and has reported a market capitalization in the range of $42.9 billion to $43.28 billion. Its trailing 12-month revenue was approximately $7.53 billion as of March 2026.
UMC provides comprehensive wafer fabrication and related manufacturing services, focusing on logic and various specialty technologies for integrated circuits (ICs). Its offerings include CMOS logic wafers, mixed-signal wafers, radio frequency (RF) CMOS wafers, embedded memory products, high voltage ICs, and CMOS image sensors. UMC's technologies support a wide range of applications across mobile and wireless communications, Internet of Things (IoT), computing, data processing, and automotive industries. The company operates 12 manufacturing fabs globally, primarily in Asia, with additional sales offices in the United States and Europe.
In terms of patent litigation, United Microelectronics Corporation operates as an operating company that both defends against and asserts patents. The company is currently a defendant in a lawsuit filed by Advanced Integrated Circuit Process LLC (AICP) in the U.S. District Court, Eastern District of Texas, which commenced on August 1, 2024. Simultaneously, UMC has taken an offensive stance, initiating a plaintiff case against AICP at the Patent Trial and Appeal Board (PTAB) on June 2, 2025, challenging the validity of AICP's patents.
The Eastern District of Texas is a known venue for patent assertion entity (PAE) litigation, and AICP is characterized as a PAE that acquired patents from Winbond Electronics (Nuvoton Technology Corporation Japan). This indicates UMC is actively defending itself against an assertion of acquired patents. Notably, UMC itself has previously been involved in significant patent disputes, including a global settlement with Micron Technology in 2021 following earlier infringement claims. Furthermore, UMC has transferred portions of its patent portfolio; for example, in 2021 and 2023, it assigned over 495 patents to IPValue Management subsidiaries, which subsequently began asserting these former UMC patents against other major technology companies.
Advanced Integrated Circuit Process LLC sued United Microelectronics Corporation for patent infringement. This case, filed in August 2024, is ongoing and has been consolidated with 2:24-cv-00730. A Markman hearing is scheduled for December 2025, with trial set for June 2026.