GCT Semiconductor Holding, Inc. (GCTS)

John Schlaefer is president, chief executive and a director. He has run GCT as chief executive since December 2012, after serving as its chief operating officer from 2006 to 2012, and before that spent the years from 1994 to 2006 at National Semiconductor, first in marketing and business development and then as a product line director. The annual report names three other executive officers. Edmond Cheng, the chief financial officer, joined in March 2024 from Cenntro, a maker of commercial electric vehicles, and had earlier been finance chief of TCL Electronics Holdings, UTStarcom and Zoomlion. Jeongmin Kim has led engineering as vice president since July 2003 and has been chief technology officer since 2013. Alex Sum, senior vice president of sales and marketing since 2013, joined in 2002 as vice president of marketing and business development, after working in product marketing at Philips Semiconductor from 1992 to 2002. A current report of September 2026 names the same four as the executive officers. 12345678

Dr. Kyeongho Lee, a co-founder, has chaired the board since 2000, and since 2002 he has also sat on the board of Anapass, a fabless chip company listed on Korea's KOSDAQ market; Anapass holds 12.4% of GCT's shares, the only stake above five percent in the annual report's ownership table. Earlier, at Silicon Image, he created and patented the PanelLink display technology that became the DVI and HDMI standards. The board counts six of its seven directors as independent, Dr. Lee among them, after weighing his relationship with a major stockholder and his loans to one of the company's subsidiaries. The other five are Robert Barker, on GCT's board since April 2011 and chair of its audit committee since 2013; Nelson C. Chan, chair of the Synaptics board since October 2018; Dr. Kukjin Chun, a professor of electrical engineering at Seoul National University from 1989 to 2020; Hyunsoo Shin, a former chief executive of CJ America; and Jeff Tuder, founder of Tremson Capital Management, whose insider filings on this company's record begin in November 2021, when it was still Concord Acquisition Corp III and had just gone public. 91011121314151617181920

At the end of 2025 GCT had 126 full-time employees: 101 in Korea, 18 in the United States, three in Taiwan, two in China and one each in Hong Kong and Japan. Nearly two in three, 80 people, work in research and development; 18 are in sales and marketing, 22 in general and administration and 6 in operations. The engineering is done in Seoul, in a research and development center of about 56,500 square feet, while the San Jose headquarters, about 5,900 square feet, houses product marketing, finance and administration and a small research team. The direct sales force is five people, backed by local distributors and sales representatives in China, Taiwan, Japan and Korea. 2122232425