This is part of the above site. International Trade Association of the Republic of China Search by product or company, and get a list of companies. This looks like it's a fairly comprehensive business directory. Taiwan Trade Database of thousands of Taiwanese companies. Taiwan Business Detailed information about public and private Taiwanese companies, organized by industry.
Information includes business sectors, addresses, officers, employees, and share capital.
Fairly comprehensive, and covers even small Taiwanese companies. Taiwanese Stock Exchange Information about publicly-traded companies. Data include price, sales, profits, registration dates, and the user can search by company or by industry. A large number of lists of the top companies in Taiwan. Gives sector, year founded, address, phone and fax.