Press release

UMC Files Form 20-F for 2018 with US Securities and Exchange Commission

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United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC”),
today filed its 2018 annual report on Form 20-F with the US Securities
and Exchange Commission. The report is available at http://www.umc.com/english/investors/Reports/2010-present_report.asp.

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 comprehensive foundry
solutions enable chip designers to leverage the company’s sophisticated
technology and manufacturing, which include world-class 28nm
High-K/Metal Gate technology, 14nm FinFET volume production, specialty
process platforms specifically developed for AI, 5G and IoT applications
and the automotive industry’s highest-rated AEC-Q100 Grade-0
manufacturing capabilities for the production of ICs found in vehicles.
UMC’s 11 wafer fabs are strategically located throughout Asia and are
able to produce over 600,000 wafers per month. The company employs more
than 20,000 people worldwide, with offices in Taiwan, 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 introduction of new services and technologies, future
outsourcing, competition, wafer capacity, 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. 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.