Note 5: Estimated capacity numbers are based on calculated maximum output rather than designed capacity. The actual capacity numbers may differ depending upon equipment delivery schedules, pace of migration to more advanced process technologies, and other factors affecting production ramp up.

    CAPEX

    UMC Capital Expenditure by Year - in US$ billion

    Year         2008       2007       2006      2005      2004      2003
    CAPEX        $0.35      $0.9       $1.0    $0.7(1)     $1.5      $0.4

    2009 CAPEX Plan
                    8" fab       12" fab               Total
    UMC              4%             96%           Not to exceed
                                                         US$400 million

The capital expenditure budget for 2009 remains unchanged. By the end of the first quarter, UMC's year-to-date CAPEX totaled US$46 million.

    (1) 2005 CAPEX contained UMC 2005 full year CAPEX and UMCi CAPEX during
        1Q05.


    Recent Developments / Announcements

    Apr. 27, 2009 UMC, Springsoft Support Custom Chip Design with 65nm Process
                  Design Kit
    Apr. 27, 2009 UMC Recognized for Excellence by Texas Instruments
    Apr. 22, 2009 UMC Announces Board Meeting Approval for New Director
                  Candidates
                  - Nine candidates for director nomination, including four
                    independent directors and one outside director. Board
                    director re-election will be held during the company's
                    2009 annual shareholders meeting. Candidates for
                    independent directors include three current independent
                    directors: Mr. Chun-Yen Chang, Prof. Chung Laung Liu and
                    Prof. Paul S.C. Hsu, and one new nominee, Prof. Cheng-Li
                    Huang.
                  - The number of independent and outside directors will
                    account for more than half of the 9 seats of board. This
                    action will significantly help to increase operating
                    transparency as well as maintain the interaction and
                    balance between the board and the management team. By
                    continuing to enhance the board and corporate governance
                    structure, UMC hopes to further increase the board's
                    efficiency and supervision to protect shareholders' value.
                  - The 2009 Annual General Meeting will be held on Wednesday,
                    June 10, 2009 at the UMC
                    Recreation Center in Hsinchu Science Park, Taiwan.
    Apr. 8, 2009  UMC Delivers Customer ICs Produced on its High Performance
                  40nm Logic Technology
    Feb. 10, 2009 UMC 4Q 2008 Financial Results
    Feb. 9, 2009  UMC 12i Wins MediaTek's 2008 Best Fab Award

Please visit UMC's website http://www.umc.com/english/news/index.asp for further details regarding the above announcements.

    Second Quarter of 2009 Outlook & Guidance

    Quarter-over-quarter Guidance:

    -- Wafer shipments: to increase by more than 110%
    -- Wafer ASP in US$: to decrease by less than 5%
    -- Capacity Utilization Rates: approximately 75%
    -- Profitability: gross profit margin to be approximately 20%
    -- The communication segment is expected to be the strongest, followed by
       the computer and consumer segments
    -- 2009 capex budget: not to exceed US$400 million

    Conference Call / Webcast Announcement

    Wednesday, April 29, 2009

    Time:  8:00 PM (Taipei) / 8:00 AM (New York) / 1:00 PM (London)

    Dial-in numbers and Access Codes:
    USA Toll Free:                 1866 519 4004
    UK Toll Free:                  0808 234 6646
    Singapore and Other Areas:     +65 6735 7955

    Access Code:                   UMC

A live webcast and replay of the 1Q09 results announcement will be available at http://www.umc.com under the "Investor Relations \ Investor Events" section.

About UMC

UMC (NYSE: UMC) (TSE: 2303) is a leading global semiconductor foundry that provides advanced technology and manufacturing services for applications spanning every major sector of the IC industry. UMC's customer-driven foundry solutions allow chip designers to leverage the strength of the company's leading-edge processes, which include production proven 65nm, 45/40nm, mixed signal/RFCMOS, and a wide range of specialty technologies. Production is supported through 10 wafer manufacturing facilities that include two advanced 300mm fabs; Fab 12A in Taiwan and Singapore-based Fab 12i are both in volume production for a variety of customer products. The company employs approximately 12,000 people worldwide and has offices in Taiwan, Japan, Singapore, Europe, and the United States. UMC can be found on the web at http://www.umc.com .

Safe Harbor Statements

This release contains forward-looking statements. These statements constitute "forward-looking" statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and as defined in the U.S. Private Securities Litigation Reform Act of 1995. You can identify these forward- looking statements by use of words such as "strategy," "expects," "continues," "plans," "anticipates," "believes," "will," "estimates," "intends," "projects," "goals," "targets" and other words of similar meaning. You can also identify them by the fact that they do not relate strictly to historical or current facts.