Our legal and commercial name is 台灣積體電路製造股份有限公司 (Taiwan Semiconductor Manufacturing Company Limited). We believe we are currently the world's largest dedicated foundry in the semiconductor industry. We were founded in 1987 as a joint venture among the R.O.C. government and other private investors and were incorporated in the R.O.C. as a company limited by shares on February 21, 1987. Our common shares have been listed on the Taiwan Stock Exchange since September 5, 1994, and our ADSs have been listed on the New York Stock Exchange since October 8, 1997.
Our principal executive office is located at No. 8, Li-Hsin Road 6, Hsinchu Science Park, Hsinchu, Taiwan, Republic of China. Our telephone number at that office is (886-3) 563-6688. Our web site is www.tsmc.com. Information contained on our website is not incorporated herein by reference and does not constitute part of this annual report.
As a foundry, we manufacture semiconductors using our manufacturing processes for our customers based on their own or third parties' proprietary integrated circuit designs. We offer a comprehensive range of wafer fabrication processes, including processes to manufacture complementary metal oxide silicon ("CMOS") logic, mixed-signal, radio frequency ("RF"), embedded memory, bipolar complementary metal oxide silicon ("BiCMOS", which uses CMOS transistors in conjunction with bipolar junction transistor) mixed-signal and other semiconductors. We estimate that our revenue market segment share among total foundries worldwide was 56% in 2018. We also offer design, mask making, bumping, advanced packaging, and testing services.