Exhibit EX-99

99.1

Announcement on 2009/09/21: To announce related materials on acquisition of machinery and equipment

99.2

Announcement on 2009/09/21: To announce related materials on acquisition of machinery and equipment

99.3

Announcement on 2009/10/01: To announce related materials on disposal of Real estate

99.4

Announcement on 2009/10/01: Amendment of the announcement on 2009/10/1:Related materials on disposal disposal of Real estate

99.5

Announcement on 2009/10/05: To announce related materials on acquisition of machinery and equipment

99.6

Announcement on 2009/10/07: To announce related materials on acquisition of machinery and equipment

99.7

Announcement on 2009/10/14: To announce a Change of Depositary for American Depositary Shares

99.8

Announcement on 2009/10/16: To announce related materials on acquisition of machinery and equipment

99.9

Announcement on 2009/10/19: To announce related materials on acquisition of machinery and equipment

99.10

Announcement on 2009/10/19: Represent subsidiary EverRich Energy Corporation to announce related materials on investment of mainland Chinese company

99.11

Announcement on 2009/10/22: To announce related materials on acquisition of machinery and equipment

99.12

Announcement on 2009/10/23: To announce related materials on acquisition of machinery and equipment

99.14

Announcement on 2009/10/15: 1) the trading and pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders of UMC; 2) the acquisition and disposition of assets by UMC

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/08/13~2009/09/21
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price:$ 904,029,250NTD;total transaction price: $904,029,250NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): APPLIED MATERIALS ASIA PACIFIC.; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/09/02~2009/09/21
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price:$ 809,920,500NTD;total transaction price: $ 809,920,500NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): LAM RESEARCH INTERNATIONAL SARL.; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Land located at Sublot Caonapo, Lot Caonapo, Yangmei Township, Taoyuan County; and the buildings at the same location.

3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume : 45,297 square meters as land;2,599 square meters as building;total transaction price is NTD802,278,844.

4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed):Unimicron Technology Corp.UMC is the company’s director.

5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Business operation needs. previous owner:Sun-Ai company etc. price of transfer::NTD691,959K , the date of acquisition:1999~2002

6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:N/A

7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Around NTD80M(depends on contract)

8.Terms of delivery or payment (including payment period and monetary amount):In accordance with the contract.

9.The manner of deciding on this transaction (such as tender invitation , price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:Comparing with professional appraisal institution and its appraisal amount; the decision-making was by chairman.

10.Name of the professional appraisal institution and its appraisal amount:Taiwan Da Hua Real Estate Appraisal Firm. Appraisal amount of NTD819,376,193.

11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:N/A

16.Concrete purpose or use of the acquisition or disposition:Strengthen financial status.

Amendment of the announcement on 2009/10/1:Related materials on disposal disposal of Real estate

8.Terms of delivery or payment (including payment period and monetary amount):In accordance with the contract.

10.Name of the professional appraisal institution and its appraisal amount:Taiwan Da Hua Real Estate Appraisal Firm. Appraisal amount of NTD819,376,193.

11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:N/A

16.Concrete purpose or use of the acquisition or disposition:Strengthen financial status.

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/08/22~2009/10/05
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price:$ 644,041,250NTD;total transaction price: $ 644,041,250NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): KLA-Tencor ( Singapore ) Pte Ltd; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/10/05~2009/10/07
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price: $ 638,679,747NTD;total transaction price: $ 638,679,747NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): KLA-Tencor ( Singapore ) Pte Ltd; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

To announce a Change of Depositary for American Depositary Shares
Date of events:2009/10/14
1.Date of occurrence of the event:2009/10/14
2.Company name: United Microelectronics Corp.
3.Relationship to the Company (please enter “head office” or “affiliate company”): Head office
4.Reciprocal shareholding ratios: N/A
5.Cause of occurrence:The Company terminated its deposit agreement with Citibank and appointed JPMorgan Chase Bank as successor depositary.
6.Countermeasures: None
7.Any other matters that need to be specified: The Company sent a notice to terminate its deposit agreement with Citibank N.A. and appointed JPMorgan Chase Bank, N.A. (“JPMorgan”) as successor depositary. The change will take effect on October 21, 2009. In conjunction with such change, an Amended and Restated Deposit Agreement (the “New Deposit Agreement”) between the Company and JPMorgan will take effect on October 21, 2009 and each existing American depositary receipt will be deemed amended and restated accordingly. The holders and beneficial owners of American depositary receipts of the Company from time to time shall become parties to, and be bound by all of the terms and conditions of, the New Deposit Agreement.

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/10/15~2009/10/16
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price: $ 1,134,211,175NTD;total transaction price: $ 1,134,211,175NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): ASML HONG KONG LTD. C/O; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/09/22~2009/10/19
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price: $ 559,645,400NTD;total transaction price: $ 559,645,400NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): APPLIED MATERIALS ASIA PACIFIC; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

Represent subsidiary EverRich Energy Corporation to announce related materials on investment of mainland Chinese company

Date of events:2009/10/19
1.Date of occurrence of the event:2009/10/19
2.Method of the present increase (decrease) in investment:Invest mainland Chinese company EverRich Energy (Shan Dong) Corporation by EverRich Energy Investment (HK) Limited
3.Transaction volume, price per unit, and total monetary amount of the transaction:USD$1,000,000
4.Company name of the invested mainland Chinese company:EverRich Energy (Shan Dong) Corporation
5.Paid-in capital of said invested mainland Chinese company:USD$0 before capital increase
6.Amount of new capital increment currently planned by said invested mainland Chinese company: USD$1,000,000
7.Main business items of said invested mainland Chinese company:Solar engineering integrated design services
8.Type of CPA opinion issued for the financial statement of said invested mainland Chinese company for the most recent fiscal year: NA
9.Net worth of said invested mainland Chinese company on the financial statement for the most recent fiscal year:NA
10.Amount of profit/loss of said invested mainland Chinese company on the financial statement for the most recent fiscal year:NA
11.Amount of actual investment to date in said invested mainland Chinese company: USD$0
12.Counterparty to the transaction and its relationship to the Company: None
13.Where the counterparty to the transaction is an actual related party, public announcement shall also be made of the reason for choosing the related party as the counterparty and the identity of the previous owner (including its relationship with the company and the trading counterpart), the date of transfer, and the price:Not applicable
14.Where a person who owned the subject matter of the transaction within the past five years has been an actual related party of the company, public announcement shall also be made of the dates and prices of acquisition and disposal by the related party and such party’s relationship to the company at those times: Not applicable
15.Gain (or loss) on disposal: Not applicable
16.Terms of delivery or payment (including payment period and monetary amount), restrictive covenants in the contract, and other important stipulations:One-time payment; None
17.The manner of deciding on this transaction, the reference basis for the decision on price and the decision-making department:By board meeting.
18.Broker: None
19.Concrete purpose of the acquisition or disposal: Long-term investment
20.Do the directors have any objection to the present transaction?: None
21.Total amount of mainland China area investment (including the present investment) approved by the Investment Commission to date: USD$0
22.Ratio of the total amount of investment (including the present investment) in the mainland China area approved by the Investment Commission to date to the paid-in capital on the financial statement for the most recent period:0%
23.Ratio of the total amount of investment (including the present investment) in the mainland China area approved by the Investment Commission to date to the total assets on the financial statement for the most recent period: 0%
24.Ratio of the total amount of investment (including the present investment) in the mainland China area approved by the Investment Commission to date to the shareholders’ equity on the financial statement for the most recent period: 0%
25.Total amount of actual investment in the mainland China area to date: USD$0
26.Ratio of the total amount of actual investment in the mainland China area to date to the paid-in capital on the financial statement for the most recent period: 0%
27.Ratio of the total amount of actual investment in the mainland China area to date to the total assets on the financial statement for the most recent period: 0%
28.Ratio of the total amount of actual investment in the mainland China area to date to the shareholders’ equity on the financial statement for the most recent period: 0%
29.Amount of recognized profits and losses on investment in the mainland China area for the most recent three fiscal years:USD$0
30.Amount of profit remitted back to Taiwan for the most recent three fiscal years: USD$0
31.Has the CPA issued an opinion on the unreasonableness of the price of the current transaction?: None
32.Any other matters that need to be specified: None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/01/23~2009/10/22
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price: $ 508,268,707NTD;total transaction price: $ 508,268,707NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): Novellus Systems International; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

1.Name and nature of the subject matter (e.g.land located at Sublot XX, Lot XX, North District, Taichung City):Machinery and equipment
2.Date of the occurrence of the event: 2009/09/13~2009/10/23
3.Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price:Transaction volume:one batch;average unit price: $ 559,364,530NTD;total transaction price: $ 559,364,530NTD
4.Counterparty to the trade and its relationship with the company (if the trading counterpart is a natural person and is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): TOKYO ELECTRON LIMITED; non-related party transaction
5.Where the counterpart to the trade is an actual related party, a public announcement shall also include the reason for choosing the related party as trading counterpart and the identity of the previous owner (including its relationship with the company and the trading counterpart), price of transfer and the date of acquisition:Not applicable
6.Where a person who owned the property within the past five years has been an actual related person of the company, a public announcement shall also include the dates and prices of acquisition and disposal by the related person and the person’s relationship to the company at those times:Not applicable
7.Anticipated loss or profit from the disposal (not applicable in cases of acquisition of assets) (where originally deferred, the status or recognition shall be stated and explained):Not applicable
8.Terms of delivery or payment (including payment period and monetary amount):1)90% paid upon shipment;10% paid after acceptance 2)100% paid after acceptance
9.The manner of deciding on this transaction (such as tender invitation, price comparison, or price negotiation), the reference basis for the decision on price and the decision-making department:transaction:price negotiation; the reference basis for the decision on price:market price. The decision-making department:the Selection Meeting
10.Name of the professional appraisal institution and its appraisal amount:Not applicable
11.Reason for any significant discrepancy with the transaction amount, and opinion of the certifying CPA:Not applicable
12.Is the appraisal report price a limited price or specific price?:Not applicable
13.Has an appraisal report not yet been obtained?:Not applicable
14.Reason an appraisal report has not yet been obtained:Not applicable
15.Broker and broker’s fee:Not applicable
16.Concrete purpose or use of the acquisition or disposition:To produce integrated circuits
17.Do the directors have any objection to the present transaction?:No
18.Any other matters that need to be specified:None

This is to report the changes or status of 1) Sales volume 2) Funds lent to other parties 3) Endorsements and guarantees 4) Financial derivative transactions for the period of September 2009.


Period		Items	2009		2008		Changes			%
September		Invoice amount		7,443,289		5,799,889		1,643,400			28.34	%
	2009	Invoice amount		47,632,435		58,925,819		(11,293,384	)		(19.17	%)
September		Net sales		9,534,518		8,051,904		1,482,614			18.41	%
	2009	Net sales		60,871,955		73,989,098		(13,117,143	)		(17.73	%)


*Balance as of period end*	This Month		Last Month		Limit of lending
UMC		0		0		25,975,543
UMC’s subsidiaries		0		0		105,828


	Change in This Month		Balance as of period end		Limit of endorsements
UMC		0		0		51,951,085
UMC’s subsidiaries		0		0		3,914,701
UMC endorses for subsidiaries				0		0
UMC’s subsidiaries endorse for UMC				0		0
UMC endorses for PRC companies				0		0
UMC’s subsidiaries endorse for PRC companies				0		0


Financial instruments	Forwards		IRS
Deposit Paid		0		0
Royalty Income (Paid)		0		0
Unwritten-off Trading Contracts		8,888,930		7,500,000
Fair Value		148,925		88,267
Net Profit from Fair Value		89,175		7,906
Written-off Trading Contracts		35,784,950		7,500,000
Realized profit (loss)		42,679		(33,190	)


Financial instruments	Credit-linked Deposits
Deposit Paid		0
Unwritten-off Trading Contracts		0
Net Profit from Market Value		0
Written-off Trading Contracts		0
Realized profit (loss)		0

This is to report 1) the trading of directors, supervisors, executive officers and 10% shareholders of United Microelectronics Corporation (“UMC”) (NYSE: UMC); 2) the pledge and clear of pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders of UMC; 3) the acquisition assets by UMC; 4) the disposition of assets by UMC for the month of September, 2009.

The trading of directors, supervisors, executive officers and 10% shareholders

Number of

Number of shares

shares held as of

held as of

Title

Name

August 31, 2009

September 30, 2009

Changes

Vice President

Nick Nee

2,310,219

10,219

(2,300,000)

Vice President

C. G. Shih

73,544

544

(73,000)

The pledge and clear of pledge of UMC common shares by directors, supervisors, executive officers and 10% shareholders: