Realtek Semiconductor Corp. (referred to as "Realtek"; Chinese: 瑞昱半導體股份有限公司) is a Taiwan-based fabless IC design company founded October 21, 1987, and headquartered at No. 2, Innovation Road II, Hsinchu Science Park, Taiwan. It is publicly listed on the Taiwan Stock Exchange under ticker 2379 (ISIN TW0002379005) and is not a subsidiary of any larger group. Reported headcount has ranged from roughly 4,200–7,900 depending on source and year; recent figures put consolidated revenue around NT$113.4 billion (2024, ~US$3.9B) with roughly 5,100–7,400 employees. It is consistently described as one of the world's largest fabless IC design houses.
Products / operations. Realtek designs and sells application-specific ICs (it fabless-outsources manufacturing and packaging). Major lines: communications-network ICs (Ethernet controllers/PHYs, Ethernet switch and gateway controllers, PON/broadband access chips, Wi-Fi/WLAN controllers and AP/router SoCs, Bluetooth, IoT, GNSS, automotive Ethernet PHY and switch silicon); computer-peripheral ICs (PC and consumer audio codecs, Class-D amplifiers, PC camera controllers, card readers, USB Type-C PD controllers, USB hubs); and multimedia ICs (LCD monitor and TV controllers, image/interface conversion chips, digital media and set-top-box SoCs). Products ship into network cards, switches, routers, servers, PCs, smart-home devices, and displays.
Patent-litigation posture. Realtek appears in our tracked data purely as a defendant — 2 cases as defendant, 0 as plaintiff — which is the classic profile of an operating company being sued rather than a patent assertion entity. Both tracked matters were filed by DivX, LLC in September 2020: one at the U.S. International Trade Commission and one in the U.S. District Court for the District of Delaware. No Eastern District of Texas activity appears.
Notable cases. The two tracked suits — DivX, LLC v. Realtek Semiconductor Corp. et al. (D. Del., 2020-09-09) and DivX, LLC v. Samsung Electronics Co., Ltd. et al. (ITC, 2020-09-10) — cluster around video/display chip technology, consistent with Realtek's multimedia and display-controller business. DivX, LLC is a video-technology licensor (formerly part of DivX/Rovi, later acquired by Endo/Neuberger Berman interests) that has asserted acquired patent portfolios. The parallel ITC and Delaware filings against Realtek and co-defendants reflect a combined Section 337 import investigation plus district-court infringement action. Details of outcomes are not established here.