Monthly Sales Report - June 1999

Hsin-Chu, Taiwan, July 9, 1999- Taiwan Semiconductor Manufacturing Company Ltd. ("TSMC" or "the Company" ) (TAIEX: 2330, NYSE: TSM) today announced that its net sales for June 1999 were NT$5,730 million, a new record breaking the prior highest.

Mr. YC Huang, TSMC Spokesman, pointed out that as a result of continued growth in the IC market, the Company's capacity was fully utilized again in June 1999. Sales for June 1999 hit another record high and registered a substantial increase of 89.8% on a year-over-year basis. Meanwhile, total revenue from January through June 1999 accumulated to NT$29,088 million, representing a 6.4% increase over the same period a year ago.