Longitude Licensing Limited, often referred to as Longitude, is an intellectual property (IP) management company headquartered in Dublin, Republic of Ireland. Founded in July 2013, it is privately owned by Vector Capital, a technology-focused private equity firm, and operates as an IPValue Management Group Company. The company's primary business involves acquiring patent portfolios from technology enterprises to maximize their value through licensing. Longitude Licensing Limited manages portfolios totaling over 8,000 active patents and patent applications, covering technologies such as semiconductor design and manufacturing processes, non-volatile storage, display, consumer electronics, memory, microprocessors, and computing systems. It operates with a small team, reportedly between 1-10 employees.
As a Non-Practicing Entity (NPE), Longitude Licensing's operational model focuses entirely on patent assertion and licensing rather than developing or selling products. Its patent litigation posture is consistently as a plaintiff, as evidenced by its two tracked cases and zero defendant appearances. The company leverages litigation to drive licensing agreements, often asserting acquired portfolios against major technology companies. Its cases frequently appear in plaintiff-friendly venues, including the Western and Eastern Districts of Texas.
Among its notable litigation, Longitude Licensing Limited, alongside its subsidiary Marlin Semiconductor Limited, is currently asserting a portfolio of former United Microelectronics Corporation (UMC) patents in two tracked cases: Marlin Semiconductor Limited et al. v. Apple et al. in the Western District of Texas, and Marlin Semiconductor Limited et al. v. Lenovo et al. in the Eastern District of Texas. These suits allege infringement related to semiconductor devices fabricated using advanced process nodes and incorporated into various consumer electronics. An associated complaint was also filed with the International Trade Commission (ITC) against the same defendants.
Beyond the tracked cases, Longitude Licensing has been involved in other significant patent disputes. In January 2026, it secured a $67 million jury verdict against BOE Technology Group Co. in the Eastern District of Texas for willful infringement of LCD display patents, originally from Seiko Epson. The company also filed suit against Amazon.com, Inc. in the Central District of California, asserting semiconductor patents, a case currently stayed pending inter partes review (IPR) proceedings. Additionally, a lawsuit against Google LLC concerning digital image correction techniques was dismissed in the Northern District of California, a decision affirmed by the Federal Circuit in April 2025 on patent eligibility grounds.