UMC Reports 2008 First Quarter Results:

Revenue from 90nm and below jumps to 37% First Quarter 2008 Overview(1): -- Revenue decreased 13.1% sequentially to NT$24 billion (US$790 million) -- Net income decreased to NT$206 million (US$7 million) -- Revenue from 90nm technology and below was 37% -- EPS was NT$0.02; EPADS was US$0.003 (1) Unless otherwise stated, all financial figures discussed in this announcement are prepared in accordance with ROC GAAP, which differ in some material respects from generally accepted accounting principles in the United States. They are un-audited, unconsolidated, and represent comparisons among the three-month period ending March 31, 2008, the three-month period ending December 31, 2007, and the equivalent three-month period that ended March 31, 2007. For all 1Q08 results, New Taiwan Dollar (NT$) amounts have been converted into U.S. Dollars at the March 31, 2008 exchange rate of NT$30.39 per U.S. Dollar.

TAIPEI, Taiwan, April 30 /Xinhua-PRNewswire-FirstCall/ -- United Microelectronics Corporation ("UMC" or "the Company"), a leading global semiconductor foundry, today announced its unconsolidated operating results for the first quarter of 2008.

"Q1 has traditionally been a slow season for the foundry industry, and this past quarter was no different due to an inventory adjustment situation," said UMC Chairman and CEO, Dr. Jackson Hu.

"The appreciation of the NT$ added another negative variable to Q1. However, we are glad to report that even during such a challenging situation, UMC's quarterly performance exceeded the original guidance. We are also happy to see that revenue contribution from 0.13um, 90nm and 65nm rose to account for 58% of total revenue. Both 90nm and 65nm showed healthy growth at 30% and 7%, respectively. Net loss due to currency exchange was NT$46 million, which is relatively insignificant considering UMC business size."

"Our leading technology customers continue to prepare for 65nm production. We therefore expect continuous increase in volume and revenue during the remainder of the year for this technology node. We are also working closely with early adopters for 45/40nm. Most of them will be in the prototype development stage in the coming months. Finally, we are developing 32nm with customers as well. Besides CMOS logic, we are closely working with Elpida to further improve the DRAM process and develop synergistic processes to broaden our technology offering. Details will be disclosed at a proper time later."

Summary of Operating Results Operating Results (Amount: NT$ million) 1Q08 4Q07 QoQ % 1Q07 YoY % change change Revenue 24,003 27,621 (13.1) 23,025 4.2 Gross Profit 3,576 5,649 (36.7) 3,676 (2.7) Operating Expenses (3,386) (4,323) (21.7) (3,658) (7.4) Operating Income 190 1,326 (85.7) 18 955.6 Non-op. Income 71 1,097 (93.5) 1,719 (95.9) (Expenses) Net Income 206 1,359 (84.8) 1,459 (85.9) EPS (NT$ per share) 0.02 0.16 0.08 (US$ per ADS) 0.003 0.026 0.013

Revenue decreased 13.1% QoQ to NT$24 billion, from NT$27.62 billion in 4Q07, and increased 4.2% YoY, from NT$23.03 billion in 1Q07. While ASP was up by 2%, wafer shipment was down by 12.4% while the stronger-than-expected NT$ contributed to the further decrease of revenues in local currency. Gross profit was NT$3.58 billion, or 14.9 % of revenue, compared to NT$5.65 billion, or 20.5% of 4Q07 revenue. Operating profit for the quarter was NT$190 million, or 0.8% of revenue, compared to NT$1.33 billion, or 4.8% of 4Q07 revenue. Lower wafer shipments due to order adjustments for softness in seasonal demand and inventory correction by several customers were the primary reasons for the decrease in revenues, and gross and operating margins during the first quarter. Net income in 1Q08 was NT$206 million, compared to NT$1.36 billion in 4Q07.

Earnings per ordinary share (EPS) for the quarter were NT$0.02. Earnings per ADS (EPADS) were US$0.003. This compares with 4Q07 EPS of NT$0.16 and EPADS of US$0.026. One ADS represents five Taiwan-listed ordinary shares. The basic weighted average number of outstanding shares in 1Q08 was 12,494,809,580, compared with 12,427,436,516 shares in 4Q07 and 17,775,610,526 shares in 1Q07. The diluted weighted average number of outstanding shares was 12,721,467,944 in 1Q08, compared with 12,881,340,388 in 4Q07 and 17,904,075,495 shares in 1Q07. The fully diluted share count on March 31, 2008 was 13,856,133 thousand. On March 31, 2008, UMC held 704,299 thousand treasury shares acquired from the 8th, 9th, and 11th share buy-back programs. UMC will retire 348,583 thousand treasury shares acquired from the 8th share buy-back program in 3Q08.

Detailed Financials Section

Depreciation and amortization expenses totaled NT$9.61 billion in 1Q08, compared to NT$9.67 billion in 4Q07. Depreciation within CoGS slightly increased to NT$8.1 billion. Other manufacturing costs within COGS declined 11.9% to NT$12.33 billion, which reflected the results of cost reduction activities and lower costs associated with a decrease in wafer shipments. Operating expenses decreased 21.7% to NT$3.39 billion. R&D expenses decreased to NT$2.03 billion, mainly due to reduced R&D wafers on 65nm and 90nm technology. The total R&D expense was 8.5% of revenue in 1Q08.

COGS & Expenses (Amount: NT$ million) 1Q08 4Q07 QoQ % 1Q07 YoY % change change Revenue 24,003 27,621 (13.1) 23,025 4.2 CoGS (20,427) (21,972) (7.0) (19,349) 5.6 Depreciation (8,098) (7,985) 1.4 (7,649) 5.9 Other Mfg. Costs (12,329) (13,987) (11.9) (11,700) 5.4 Gross Profit 3,576 5,649 (36.7) 3,676 (2.7) Gross Margin (%) 14.9% 20.5% 16.0% Total Operating Exp. (3,386) (4,323) (21.7) (3,658) (7.4) G&A (636) (906) (29.8) (678) (6.2) Sales & Marketing (716) (882) (18.8) (650) 10.2 R&D (2,034) (2,535) (19.8) (2,330) (12.7) Operating Income 190 1,326 (85.7) 18 955.6 Operating Margin (%) 0.8% 4.8% 0.1%

Net non-operating income during 1Q08 was NT$71 million. Total gains on the disposal of investments were NT$652 million, including a gain from the sale of MediaTek shares for NT$616 million. Net investment losses were NT$278 million, which included a NT$599 million loss from valuation of ProMos shares. Net foreign exchange losses were NT$46 million, which include losses of NT$718 from foreign exchange and NT$672 million from hedging gains.

Non-operating Income (Expenses) (Amount: NT$ million) 1Q08 4Q07 1Q07 Net Non-operating Income (Exp.) 71 1,097 1,719 Net Interest Income (Expense) 116 143 260 Net Investment Income (Loss) (278) (1,124) 109 Gain on Disposal of Investment 652 2,025 1,624 Exchange Gain (Loss) (718) 108 17 Others 299 (55) (291)

Net cash outflow was NT$7.82 billion in 1Q08. The NT$11.76 billion of financing cash outflow included NT$12.22 billion cash outflow from the redemption of Euro Convertible Bond (ECB) at maturity. Free cash flow(2) for 1Q08 was NT$3.77 billion. Over the next 12 months, we expect to repay NT$10.5 billion in unsecured corporate bonds and US$15 million in short-term loans.

(2) Free cash flow = Operating cash flow - Capital expenditures Cash Flow Summary For the 3-Month For the 3-Month (Amount: NT$ million) Period Ended Period Ended Mar. 31, 2008 Dec. 31, 2007 Cash Flow from Operations 9,455 14,549 Net Income (Loss) 206 1,359 Depreciation & Amortization 9,605 9,674 Changes in working capital 314 4,399 Others (670) (883) Cash Flow from Investing (5,362) (1,873) Capital Expenditures (5,685) (2,740) Others 323 867 Cash Flow from Financing (11,763) (52,004) Capital Reduction -- (53,911) Redemption of bonds (12,217) -- Others 454 1,907 Effect of Exchange Rate (148) (7) Net Cash Flow (7,818) (39,335)

Cash and cash equivalents decreased NT$7.82 billion to NT$29.63 billion during 1Q08, which was mainly due to the redemption of ECB. The decrease in notes and accounts receivable primarily reflected the downward trend of the business. The decrease in inventory came from the decrease of work-in-process wafers and finished goods.

Current Assets (Amount: NT$ billion) 1Q08 4Q07 1Q07 Cash & Cash Equivalents 29.63 37.45 80.99 Notes & Accounts Receivable 12.78 13.62 12.85 Days Sales Outstanding 50 51 50 Inventory 11.09 11.33 9.96 Avg. Inventory Turnover 51 47 48 Total Current Assets 60.06 68.25 115.43

Total liabilities decreased by NT$16.28 billion to NT$38.02 billion in 1Q08. This was primarily due to the redemption of ECB. UMC's Debt to Equity ratio decreased to 17% at the end of 1Q08.

Liabilities (Amount: NT$ billion) 1Q08 4Q07 1Q07 Total Current Liabilities 26.92 43.15 41.81 Accounts Payable 4.50 4.80 4.65 Short-term Credit / Bonds 10.96 22.89 17.83 Others 11.46 15.46 19.33 Long-term Liabilities 7.50 7.50 17.99 Total Liabilities 38.02 54.30 63.41 Debt to Equity 17% 23% 22% Analysis of Revenue(3)

The percentage of revenue from the Asia Pacific region decreased to 29% due to the soft demand for wireless communication chips and driver ICs.

(3) Free cash flow = Operating cash flow - Capital expenditures Revenue Breakdown by Region Region 1Q08 4Q07 3Q07 2Q07 1Q07 North America 58% 51% 49% 47% 47% Asia Pacific 29% 37% 40% 43% 43% Europe 11% 10% 9% 8% 7% Japan 2% 2% 2% 2% 3%

The percentage of revenue from advanced 65nm business increased to 7%, compared to 3% in 4Q07, mainly due to stronger demand for leading communication and computer chips. The percentage of revenue from 90nm and below was 37% in 1Q08, which was improved from 26% in 4Q07.

Revenue Breakdown by Geometry Geometry 1Q08 4Q07 3Q07 2Q07 1Q07 65nm 7% 3% 1% -- -- 90um 30% 23% 24% 17% 21% 90nm< x <=0.13um 21% 22% 23% 25% 16% 0.13um< x <=0.18um 22% 27% 26% 29% 30% 0.18um< x <=0.35um 14% 18% 20% 22% 25% 0.5um and above 6% 7% 6% 7% 8%

The percentage of revenue from IDM customers increased to 30% in 1Q08 from 24% in 4Q07.

Revenue Breakdown by Customer Type Customer Type 1Q08 4Q07 3Q07 2Q07 1Q07 Fabless 70% 76% 73% 75% 76% IDM 30% 24% 27% 25% 24% System 0% 0% 0% 0% 0%

Revenue from the computer segment increased to 21% of total revenue in 1Q08 due to stronger demand for PC graphics.

Revenue Breakdown by Application (i) Application 1Q08 4Q07 3Q07 2Q07 1Q07 Computer 21% 19% 18% 17% 18% Communication 56% 56% 57% 55% 56% Consumer 21% 23% 23% 26% 24% Memory 1% 1% 1% 1% 1% Others 1% 1% 1% 1% 1% (i) Computer consists of ICs such as HDD controllers, DVD-ROM/CD-ROM drives ICs, LCD drivers, graphic processors, and PDAs. Communication consists of xDSL, DSP, WLAN, LAN controllers, handset components, caller ID devices, etc. Consumer consists of ICs used for DVD players, game consoles, digital cameras, smart cards, toys, etc. Memory consists of DRAM, SRAM, Flash, EPROM, ROM, and EEPROM. Blended Average Selling Price Trend

The blended average selling price (ASP) increased by 2% during 1Q08 due to more wafer shipments on leading-edge process technologies.

(To view ASP trend, visit http://www.umc.com/english/investors/1Q08_ASP_trend.asp )

Shipment and Utilization Rate (4)

807 thousand 8-inch equivalent wafers were shipped in 1Q08, which was a 12.4% decrease from the 921 thousand 8-inch equivalent wafers that were shipped in the previous quarter. Overall utilization rate for the quarter was 73%.

(4) Utilization Rate = Quarterly Wafer Out / Quarterly Capacity Wafer Shipments 1Q08 4Q07 3Q07 2Q07 1Q07 Wafer Shipments ('000 8-inch eq.) 807 921 1,017 804 732 Quarterly Capacity Utilization Rate 1Q08 4Q07 3Q07 2Q07 1Q07 Utilization Rate 73% 86% 93% 76% 74%(i) Total Capacity 1,100 1,100 1,095 1,070 1,043 ('000 8-inch eq.) (i) 1Q07 utilization rate was calculated based on 1Q07 available capacity, which is about 95% of total capacity after factoring in a 5% productivity loss due to annual scheduled maintenance. Capacity (5)

Total capacity during 1Q08 was 1,100 thousand 8-inch equivalent wafers, which remains unchanged compared to 4Q07. The installed capacity in 2Q08 is expected to be 1,107 thousand 8-inch equivalent wafers. The increase in estimated capacity during 2Q08 is expected to come from additional capacity expansion at some 8-inch fabs and Fab 12A.

(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. Annual Capacity in thousands of 8-inch wafer equivalents FAB Geometry (um) 2007 2006 2005 2004 Fab 6A 6" 3.5 - 0.45 328 328 344 346 Fab 8AB 8" 0.5 - 0.25 816 816 816 796 Fab 8C 8" 0.35 - 0.15 400 400 401 386 Fab 8D 8" 0.18 - 0.09 260 252 274 256 Fab 8E 8" 0.5 - 0.18 408 406 404 401 Fab 8F 8" 0.25 - 0.15 372 372 378 349 Fab 8S (i) 8" 0.25 - 0.15 276 276 278 131 Fab 12A 12" 0.18 - 0.065 847 754 597 392 Fab 12i(ii) 12" 0.13 - 0.065 601 413 363 101 Total (iii) 4,308 4,017 3,855 3,158 YoY Growth Rate 7% 4% 22% 19% Quarterly Capacity in thousands of 8-inch wafer equivalents FAB 2Q08E 1Q08 4Q07 3Q07 Fab 6A 82 82 82 82 Fab 8AB 204 204 204 204 Fab 8C 101 100 100 100 Fab 8D 66 65 65 65 Fab 8E 102 102 102 102 Fab 8F 93 93 93 93 Fab 8S 72 69 69 69 Fab 12A 218 216 216 216 Fab 12i 169 169 169 164 Total (iii) 1,107 1,100 1,100 1,095 (i) Former fab of SiSMC, which was acquired from Silicon Integrated Systems in July 2004. (ii) Former fab of UMCi, a UMC wholly owned subsidiary in December 2004 that was merged into UMC in April 2005 (iii) One 6-inch wafer is converted into 0.5625(6sq/8sq) 8-inch equivalent wafer; one 12-inch wafer is converted into 2.25(12sq/8sq) 8-inch equivalent wafers. CAPEX

CAPEX plans for 2008 remain unchanged at US$500-700 million. Total capital expenditure during 1Q08 was US$187 million.

UMC Capital Expenditure by Year - in US$ billion Year 2007 2006 2005 2004 2003 2002 CAPEX $0.9 $1.0 $0.7(i) $1.5 $0.4 $0.8 2008 CAPEX Plan 8" fab 12" fab 12" R&D Total UMC 11% 63% 26% US$500-700 million (i) 2005 CAPEX contained UMC 2005 full year CAPEX and UMCi CAPEX during 1Q05. Recent Developments / Announcements Apr. 3, 2008 UMC Wins Global Views Magazine 2008 CSR Model Award Mar. 17, 2008 UMC Board of Directors Announces Proposals for its Annual Shareholders Meeting A brief summary of the proposals is as follows: -- Shareholder cash dividend of NT$9,382,646,949, stock dividend of NT$1,000,815,670 and NT$4,628,772,490 from capital reserve. Total issued to shareholders estimated at NT$1.20 per share, including cash dividend of estimated NT$0.75 per share, stock dividend of estimated NT$0.08 per share, and estimated NT$0.37 per share from capital reserve. -- Employee cash bonus of NT$286,541,418 and stock bonus of NT$1,146,165,670. -- For the purpose of recording employee bonus expense since Jan 2008, the Company will use 15% of net income after tax (excluding employee bonus expenses) as the accounting book-entry basis -- The 2008 AGM will be held on June 13, 2008 at the UMC Recreation Center in Hsinchu Science Park, Taiwan. Mar. 17, 2008 UMC and Elpida Partner to Serve Japan based Foundry Customers Mar. 14, 2008 UMC First Company in Taiwan to Receive Level A Grade from GRI for its CSR Report Feb. 22, 2008 UMC Holds 2008 Supply Chain Management Summit and Signs CSR Declaration with its Suppliers to Enhance Industry's Green Competitiveness Feb. 4, 2008 UMC University Program Members to Present Eight Papers During International Solid State Circuits Conference Jan. 30, 2008UMC 4Q 2007 Financial Results

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

Second Quarter of 2008 Outlook & Guidance Quarter-over-quarter Guidance: -- Wafer shipments: to increase by approximately 10% points -- Wafer ASP in US$: to decrease by approximately 2% points -- Impact from Currency Fluctuation: -3% to -5% on revenue -- Capacity utilization rate: approximately 80% -- Profitability: gross profit margin to be approximately 20% -- The communication segment is expected to the strongest followed by the consumer and computer segments -- 2008 capex budget: US$500-700 million Conference Call / Webcast Announcement Wednesday, April 30, 2008 Time: 8:00 PM (Taipei) / 8:00 AM (New York) / 1:00 PM (London) Dial-in numbers and Access Codes: USA Toll Free: 1866 549 1292 UK Toll Free: 0808 234 6305 Singapore Toll Free: 800 852 3576 Hong Kong and Other Areas: +852 3005 2050 Access Code: UMC

A live webcast and replay of the 1Q08 results announcement will be available at http://www.umc.com/ under the "Investor Relations \ Investor Events" section.

About UMC

UMC is a leading global semiconductor foundry that manufactures advanced process ICs for applications spanning every major sector of the semiconductor industry. UMC delivers cutting-edge foundry technologies that enable sophisticated system-on-chip (SoC) designs, including volume production 90nm, industry-leading 65nm, and mixed signal/RFCMOS. UMC's 10 wafer manufacturing facilities 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 13,000 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

Except for statements in respect of historical matters, the statements in this release contain "forward-looking statements" within the meaning of Section 27A of the U.S. Securities Act of 1933 and Section 21E of the U.S. Securities Exchange Act of 1934. These forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause the actual performance, financial condition or results of operations of UMC to be materially different from what is stated or may be implied in such forward- looking statements. Investors are cautioned that actual events and results could differ materially from those statements as a result of a number of factors, including, among other things: our dependence upon the frequent introduction of new services and technologies based on the latest developments in our industry; the intensely competitive semiconductor, communications, consumer electronics and computer industries and markets; the risks associated with international global business activities; our dependence upon key personnel; general economic and political conditions, including those related to the semiconductor, communications, consumer electronics and computer industries; possible disruptions in commercial activities caused by natural and human-induced events and disasters, including terrorist activity, armed conflict and highly contagious diseases; reduced end-user purchases relative to expectations and orders; fluctuations in foreign currency exchange rates; and those risks identified in the section entitled "Risk Factors" in UMC's Annual Report on Form 20-F ("20-F") for the year ended December 31, 2006 filed with the U.S. Securities and Exchange Commission on May 9, 2007.

The financial statements included in this release are unaudited and unconsolidated, and prepared and published in accordance with ROC GAAP. Investors are cautioned that there are many differences between ROC GAAP and US GAAP, as described in note 39 to the financial statements on 20-F.

The forward-looking statements in this release reflect the current belief of UMC as of the date of this release and UMC undertakes no obligation to update these forward-looking statements for events or circumstances that occur after such date or to reflect the occurrence of unanticipated events.

- FINANCIAL TABLES TO FOLLOW - UNITED MICROELECTRONICS CORPORATION Unaudited Condensed Unconsolidated Balance Sheet As of March 31, 2008 Figures in Million of New Taiwan Dollars (NT$) and U.S. Dollars (US$) March 31, 2008 US$ NT$ % ASSETS Current Assets Cash and Cash Equivalents 975 29,635 11.3% Financial assets at fair value through profit or loss, current 141 4,295 1.6% Notes & Accounts Receivable 421 12,777 4.9% Inventories 365 11,088 4.2% Other Current Assets 74 2,263 0.9% Total Current Assets 1,976 60,058 22.9% Non-Current Assets Funds and Long-term Investments 2,365 71,854 27.5% Property, Plant and Equipment 3,946 119,922 45.7% Intangible Assets 123 3,745 1.4% Other Assets 217 6,600 2.5% Total Non-Current Assets 6,651 202,121 77.1% TOTAL ASSETS 8,627 262,179 100.0% LIABILITIES Current Liabilities Short-term Loans 15 457 0.2% Financial liabilities at fair value through profit or loss, current 6 171 0.1% Payables 510 15,498 5.9% Current Portion of Long-term Liabilities 345 10,500 4.0% Other Current Liabilities 10 297 0.1% Total Current Liabilities 886 26,923 10.3% Non-Current Liabilities Bonds Payable 247 7,496 2.8% Other Liabilities 118 3,599 1.4% Total Non-Current Liabilities 365 11,095 4.2% TOTAL LIABILITIES 1,251 38,018 14.5% STOCKHOLDERS' EQUITY Capital Stock 4,348 132,145 50.4% Additional Paid-in Capital 2,177 66,150 25.2% Retained Earnings, Unrealized Gain on Financial Assets and Translation Adjustment 1,345 40,869 15.6% Treasury Stock (494) (15,003) -5.7% TOTAL STOCKHOLDERS' EQUITY 7,376 224,161 85.5% TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY 8,627 262,179 100.0% Note New Taiwan Dollars have been translated into U.S. Dollars at the March 31, 2008 exchange rate of NT$30.39 per U.S. Dollar. All figures are in ROC GAAP. UNITED MICROELECTRONICS CORPORATION Unaudited Condensed Unconsolidated Income Statement Figures in Million of New Taiwan Dollars (NT$) and U.S. Dollars (US$) Except Per Share and Per ADS Data Year over Year Comparison Three-Month Period Ended Mar 31, 2008 Mar 31, 2007 % US$ NT$ US$ NT$ Chg. Net Sales 790 24,003 758 23,025 4.2% Cost of Goods Sold (672) (20,427) (637) (19,349) 5.6% Net Gross Profit 118 3,576 121 3,676 -2.7% 14.9% 14.9% 16.0% 16.0% Operating Expenses - Sales & Marketing 24 716 21 650 10.2% - General & Administrative 21 636 22 678 -6.2% - Research & Development 67 2,034 77 2,330 -12.7% 112 3,386 120 3,658 -7.4% Operating Income (Loss) 6 190 1 18 955.6% 0.8% 0.8% 0.1% 0.1% Net Non-Operating Income (Expenses) 3 71 56 1,719 -95.9% Income (Loss) from continuing operations before income tax 9 261 57 1,737 -85.0% 1.1% 1.1% 7.5% 7.5% Income Tax (Expense) Benefit (2) (55) (9) (278) -80.2% Net Income (Loss) 7 206 48 1,459 -85.9% 0.9% 0.9% 6.3% 6.3% Earnings per Share 0.001 0.02 0.003 0.08 Earnings per ADS (2) 0.003 0.10 0.013 0.40 Weighted Average Number of Shares Outstanding (in millions) 12,495 17,776 (cont.) Quarter over Quarter Comparison Three-Month Period Ended Mar 31, 2008 Dec 31, 2007 % US$ NT$ US$ NT$ Chg. Net Sales 790 24,003 909 27,621 -13.1% Cost of Goods Sold (672) (20,427) (723) (21,972) -7.0% Net Gross Profit 118 3,576 186 5,649 -36.7% 14.9% 14.9% 20.5% 20.5% Operating Expenses - Sales & Marketing 24 716 29 882 -18.8% - General & Administrative 21 636 30 906 -29.8% - Research & Development 67 2,034 83 2,535 -19.8% 112 3,386 142 4,323 -21.7% Operating Income (Loss) 6 190 44 1,326 -85.7% 0.8% 0.8% 4.8% 4.8% Net Non-Operating Income (Expenses) 3 71 36 1,097 -93.5% Income (Loss) from continuing operations before income tax 9 261 80 2,423 -89.2% 1.1% 1.1% 8.8% 8.8% Income Tax (Expense) Benefit (2) (55) (35) (1,064) -94.8% Net Income (Loss) 7 206 45 1,359 -84.8% 0.9% 0.9% 4.9% 4.9% Earnings per Share 0.001 0.02 0.005 0.16 Earnings per ADS (2) 0.003 0.10 0.026 0.80 Weighted Average Number of Shares Outstanding (in millions) 12,495 12,427 Note: (1) New Taiwan Dollars have been translated into U.S. Dollars at the March 31, 2008 exchange rate of NT$30.39 per U.S. Dollar. All figures are in ROC GAAP. (2) 1 ADS equals 5 common shares. UNITED MICROELECTRONICS CORPORATION Unaudited Condensed Unconsolidated Income Statement Figures in Million of New Taiwan Dollars (NT$) and U.S. Dollars (US$) Except Per Share and Per ADS Data For the Three-Month Period Ended For the year Ended Mar 31, 2008 Mar 31, 2008 US$ NT$ % US$ NT$ % Net Sales 790 24,003 100.0% 790 24,003 100.0% Cost of Goods Sold (672) (20,427) -85.1% (672) (20,427) -85.1% Net Gross Profit 118 3,576 14.9% 118 3,576 14.9% Operating Expenses - Sales & Marketing 24 716 3.0% 24 716 3.0% - General & Administrative 21 636 2.6% 21 636 2.6% - Research & Development 67 2,034 8.5% 67 2,034 8.5% 112 3,386 14.1% 112 3,386 14.1% Operating Income (Loss) 6 190 0.8% 6 190 0.8% Net Non-Operating Income (Expenses) 3 71 0.3% 3 71 0.3% Income (Loss) from continuing operations before income tax 9 261 1.1% 9 261 1.1% Income Tax (Expense) Benefit (2) (55) -0.2% (2) (55) -0.2% Net Income (Loss) 7 206 0.9% 7 206 0.9% Earnings per Share 0.001 0.02 0.001 0.02 Earnings per ADS (2) 0.003 0.10 0.003 0.10 Weighted Average Number of Shares 12,495 12,495 Outstanding (in millions) Note: (1) New Taiwan Dollars have been translated into U.S. Dollars at the March 31, 2008 exchange rate of NT$30.39 per U.S. Dollar. All figures are in ROC GAAP. (2) 1 ADS equals 5 common shares. UNITED MICROELECTRONICS CORPORATION Unaudited Condensed Unconsolidated Statement of Cash Flows For The Three Months Ended Mar. 31, 2008 Figures in Million of New Taiwan Dollars (NT$) and U.S. Dollars (US$) USD NTD Cash flows from operating activities: Net Income 7 206 Depreciation & Amortization 316 9,605 Gain on recovery in market value and obsolescence of inventories (2) (51) Cash dividends received under the equity method 4 135 Investment loss accounted for under the equity method 11 319 Gain on valuation of financial assets and liabilities (6) (192) Impairment loss 0 10 Gain on disposal of investments (21) (652) Gain on disposal of property, plant and equipment (0) (4) Exchange gain on financial assets and liabilities (1) (25) Exchange gain on long-term liabilities (6) (178) Amortization of bond discounts 0 6 Amortization of deferred income (1) (38) Change in assets and liabilities 10 314 Net cash provided from operating activities 311 9,455 Cash flows from investing activities: Proceeds from disposal of available-for-sales financial assets 22 670 Acquisition of long-term investments accounted for the equity method (0) (13) Proceeds from disposal of long- term investments accounted for the equity method 0 0 Acquisition of property, plant and equipment (187) (5,685) Proceeds from disposal of property, plant and equipment 0 5 Acquisition of deferred charges (11) (340) Decrease in other assets - others 0 1 Net cash used in investing activities (176) (5,362) Cash flows from financing activities: Proceeds from short-term Loans 15 456 Redemption of bonds (402) (12,217) Decrease in deposits-in (0) (2) Net cash used in financing activities (387) (11,763) Effect of exchange rate changes on cash and cash equivalents (5) (148) Decrease in cash and cash equivalents (257) (7,818) Cash and cash equivalents at beginning of period 1,232 37,453 Cash and cash equivalents at end of period 975 29,635 Note: New Taiwan Dollars have been translated into U.S. Dollars at the March 31, 2008 exchange rate of NT$ 30.39 per U.S. Dollar. All figures are in ROC GAAP. Contacts: Bowen Huang / I Cheng Lu UMC, Investor Relations Tel: +886-2-2700-6999 ext. 6957 Email: bowen_huang@umc.com i_cheng_lu@umc.com