In 3Q15, CAPEX spending was US$627 million. Capital expenditures for the three quarters reached US$1.48 billion. 2015 CAPEX will be approximately US$1.8 billion, with 87% of the amount dedicated towards 12" advanced capacity expansion.

Fourth Quarter of 2015 Outlook & Guidance

Quarter-over-Quarter Guidance:

• Wafer Shipments: To decrease by less than 5%
• ASP in US$: To decrease by approximately 1%
• Profitability: Gross profit margin will be in the high teens % range
• Foundry Segment Capacity Utilization: Approximately low 80% range
• 2015 CAPEX for Foundry Segment: US$1.8bn

Recent Developments / Announcements

Please visit UMC's website for further details regarding the above announcements

Conference Call / Webcast Announcement

Wednesday, October 28, 2015

A live webcast and replay of the 3Q15 results announcement will be available at
www.umc.com under the "Investors / Events" section.

About UMC

UMC (NYSE: UMC, TWSE: 2303) is a leading global semiconductor foundry that provides advanced IC production for applications spanning every major sector of the electronics industry. UMC's robust foundry solutions enable chip designers to leverage the company's sophisticated technology and manufacturing, which include volume production 28nm gate-last High-K/Metal Gate technology, ultra-low power platform processes specifically engineered for Internet of Things (IoT) applications and the automotive industry's highest-rated AEC-Q100 Grade-0 manufacturing capabilities for production of ICs found in cars. UMC's 10 wafer fabs are strategically located throughout Asia and are able to produce over 500,000 wafers per month. The company employs more than 17,000 people worldwide, with offices in Taiwan, mainland China, Europe, Japan, Korea, Singapore, and the United States. UMC can be found on the web at http://www.umc.com

Note from UMC Concerning Forward-Looking Statements

Some of the statements in the foregoing announcement are forward looking within the meaning of the U.S. Federal Securities laws, including statements about future outsourcing, wafer capacity, technologies, business relationships and market conditions. Investors are cautioned that actual events and results could differ materially from these statements as a result of a variety of factors, including conditions in the overall semiconductor market and economy; acceptance and demand for products from UMC; and technological and development risks. Further information regarding these and other risks is included in UMC's filings with the U.S. Securities and Exchange Commission, including its registration statements and reports on Forms F-1, F-3, F-6 and 20-F and 6-K, in each case as amended. UMC does not undertake any obligation to update any forward-looking statement as a result of new information, future events or otherwise, except as required under applicable law.