OpenUp Group (formerly Trustworks)

Open Up Group Inc. (formerly known as Trust Works Inc.) is a large Japan-based human resources and engineer staffing company listed on the Tokyo Stock Exchange Prime Market. The company dispatches engineers and technical staff to manufacturers, construction contractors, and IT companies across Japan and internationally. With over 24,350 engineers on dispatch as of May 2026 and revenue of 187.9 billion yen for fiscal year ending June 2025, Open Up Group operates across multiple sectors including mechanical/electrical engineering, IT, construction, and international business. Originally listed on JASDAQ in 2007, the company has grown into one of Japan's largest engineer staffing groups with subsidiaries spanning IT development, embedded software, construction engineering, and overseas operations.