UNITED MICROELECTRONICS CORP — Regulatory Filings 2006

Oct 17, 2006

6-K 1 d6k.htm FORM 6-K Form 6-K

1934 Act Registration No. 1-15128

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

Dated October 15, 2006

For the month of September 2006

United Microelectronics Corporation

(Translation of Registrant’s Name into English)

No. 3 Li Hsin Road II

Science Park

Hsinchu, Taiwan, R.O.C.

(Address of Principal Executive Office)

(Indicate by check mark whether the registrant files or will file annual reports under cover of form 20-F or Form 40-F.)

Form 20-F V Form 40-F

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes No V

(If “Yes” is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b): Not applicable )

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

/s/ Chitung Liu
Chitung Liu
Chief Financial Officer

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Exhibit

Exhibit	Description
99.1	Announcement on September 18, 2006: Represent subsidiary TLC Capital Co, Ltd. to announce the acquisition of SuperAlloy Industrial Co., Ltd. Common shares
99.2	Announcement on September 19, 2006: To announce related materials on acquisition of machinery and equipment
99.3	Announcement on September 19, 2006: To announce related materials on disposal of MediaTek Incorporation securities
99.4	Announcement on September 20, 2006: To announce related materials on acquisition of machinery and equipment
99.5	Announcement on September 22, 2006: To announce related materials on acquisition of machinery and equipment
99.6	Announcement on September 25, 2006: To announce related materials on acquisition of machinery and equipment
99.7	Announcement on September 27, 2006: To announce related materials on disposal of MediaTek Incorporation securities
99.8	Announcement on October 4, 2006: To announce related materials on acquisition of machinery and equipment
99.9	Announcement on October 9, 2006: To announce related materials on acquisition of machinery and equipment
99.10	Announcement on October 9, 2006: August Revenue
99.11	Announcement on October 11, 2006: To announce related materials on acquisition of machinery and equipment
99.12	Announcement on October 13, 2006: 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

Exhibit 99.1

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Represent subsidiary TLC Capital Co, Ltd. to announce the acquisition of SuperAlloy Industrial Co., Ltd. Common shares

1. Name and nature of the subject matter (if preferred shares, the terms and conditions of issuance shall also be indicated, e.g. dividend yield): Common shares of SuperAlloy Industrial Co., Ltd.

2. Date of occurrence of the event: 2006/08/31~2006/09/18

3. Volume, unit price, and total monetary amount of the transaction:

(1) trading volume:5,000,000 shares;average unit price:$45 NTD; total amount:$225,000,000 NTD;

(2) trading volume:3,800,000 shares;average unit price:$45 NTD; total amount:$171,000,000 NTD;

1. Counterpart to the trade and its relationship to the Company (if the trading counterpart is a natural person and furthermore is not an actual related party of the Company, the name of the trading counterpart is not required to be disclosed): SuperAlloy Industrial Co., Ltd. and Taiwan Special Opportunities Fund III; None

2. Where the counterpart to the trade is an actual related party, a public announcement shall also be made of 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 date of acquisition: n/a

3. 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

4. Matters related to the creditor’s rights currently being disposed of (including types of collateral of the disposed creditor’s rights; if the creditor’s rights are creditor’s rights toward a related person, the name of the related person and the book amount of the creditor’s rights toward such related person currently being disposed of must also be announced): n/a

5. Anticipated profit or loss from the disposal (not applicable in cases of acquisition of securities) (where originally deferred, the status or recognition shall be stated and explained): n/a

6. Terms of delivery or payment (including payment period and monetary amount), restrictive covenants in the contract, and other important stipulations:

(1) one-time payment of $225,000,000 NTD on 2006/08/31;

(2) one-time payment of $171,000,000 NTD on 2006/09/18;

1. The manner in which the current transaction was decided, the reference basis for the decision on price, and the decision-making department: The decision making manner: New share issuance and Price negotiation; The decision-making department: The Chairman & President Office

2. Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g. pledges): cumulative volume:8,800,000 shares;amount:$396,000,000 NTD; percentage of holdings:6.18%

3. Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholder’s equity as shown in the most recent financial statement and the operating capital as shown in the most recent financial statement: ratio of total assets: 76.44%; ratio of shareholder’s equity:76.74%; the operational capital as shown in the most recent financial statement: $3,198,887 thousand NTD

4. Broker and broker’s fee: n/a

5. Concrete purpose or use of the acquisition or disposition: Long-term investment

6. Net worth per share of company underlying securities acquired or disposed of: n/a

7. Do the directors have any objection to the present transaction?: no

8. Has the CPA issued an opinion on the unreasonableness of the price of the current transaction?: no

9. Any other matters that need to be specified: The actual English name yet to be determined

Exhibit 99.2

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To announce related materials on acquisition of machinery and equipment

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: 2006/01/17~2006/09/18

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 527,904,600 NTD; total transaction price:$ 527,904,600 NTD

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): VARIAN SEMICONDUCTOR EQUIPMENT; 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

Exhibit 99.3

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To announce related materials on disposal of MediaTek Incorporation securities

1. Name of the securities: Common shares of MediaTek Incorporation

2. Trading date: 2006/09/11~2006/09/19

3. Trading volume, unit price, and total monetary amount of the transaction: trading volume: 1,030,000 shares; average unit price:$ 323.06 NTD; total amount:$ 332,755,000 NTD

4. Gain (or loss) (not applicable in case of acquisition of securities): $ 322,101,260 NTD

5. Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6. Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g. pledges): cumulative volume: 29,903,499 shares; amount: 309,304,937 NTD; percentage of holdings: 3.09%; status of restriction of rights: no

7. Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholder’s equity as shown in the most recent financial statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 13.31 %; ratio of shareholder’s equity: 16.80 %; the operational capital as shown in the most recent financial statement: $ 82,601,170 thousand NTD

8. Concrete purpose/objective of the acquisition or disposal: financing operation

9. Do the directors have any objections to the present transaction? none

10. Any other matters that need to be specified: none

Exhibit 99.4

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To announce related materials on acquisition of machinery and equipment

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: 2006/08/31~2006/09/19

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 838,966,871 NTD; total transaction price:$ 838,966,871 NTD

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 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

Exhibit 99.5

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To announce related materials on acquisition of machinery and equipment

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: 2006/08/28~2006/09/21

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 763,068,770 NTD; total transaction price:$ 763,068,770 NTD

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

Exhibit 99.6

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To announce related materials on acquisition of machinery and equipment

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: 2006/09/22

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 862,508,800 NTD; total transaction price:$ 862,508,800 NTD

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

Exhibit 99.7

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To announce related materials on disposal of MediaTek Incorporation securities

1. Name of the securities: Common shares of MediaTek Incorporation

2. Trading date: 2006/09/20~2006/09/27

3. Trading volume, unit price, and total monetary amount of the transaction: trading volume: 1,150,000 shares; average unit price: $ 318.55 NTD; total amount: $ 366,337,000 NTD

4. Gain (or loss) (not applicable in case of acquisition of securities): $ 354,442,049 NTD

5. Relationship with the underlying company of the trade: MediaTek Incorporation, none.

6. Current cumulative volume, amount, and shareholding percentage of holdings of the security being traded (including the current trade) and status of any restriction of rights (e.g. pledges): cumulative volume: 28,753,499 shares; amount: 297,409,986 NTD; percentage of holdings: 2.97 %; status of restriction of rights: no

7. Current ratio of long or short term securities investment (including the current trade) to the total assets and shareholder’s equity as shown in the most recent financial statement and the operational capital as shown in the most recent financial statement: ratio of total assets: 13.22%; ratio of shareholder’s equity: 16.68 %; the operational capital as shown in the most recent financial statement: $ 82,601,170 thousand NTD

8. Concrete purpose/objective of the acquisition or disposal: financing operation

9. Do the directors have any objections to the present transaction? none

10. Any other matters that need to be specified: none

Exhibit 99.8

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To announce related materials on acquisition of machinery and equipment

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: 2006/09/20~2006/10/03

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 892,828,022 NTD; total transaction price:$ 892,828,022 NTD

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 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

Exhibit 99.9

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To announce related materials on acquisition of machinery and equipment

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: 2005/10/28~2006/10/06

3. Transaction volume (e.g.XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: a batch; average unit price: $ 511,212,990 NTD; total transaction price: $ 511,212,990 NTD

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): SINGAPORE OXYGEN AIR LIQUIDE; 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

Exhibit 99.10

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United Microelectronics Corporation

October 9, 2006

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 2005

1) Sales volume (NT$ Thousand)

Period	Items	2006	2005	Changes		%
September	Invoice amount	7,425,525	7,943,175	(517,650	)	(6.52	)%
2006	Invoice amount	69,430,931	61,637,105	7,793,825		12.64	%
September	Net sales	9,233,535	8,502,877	730,659		8.59	%
2006	Net sales	77,986,826	63,307,422	14,679,404		23.19	%

2) Funds lent to other parties (NT$ Thousand)

Balance as of period end	This Month	Last Month	Limit of lending
UMC	0	0	38,170,619
UMC’s subsidiaries	22,880	22,749	542,947

3) Endorsements and guarantees (NT$ Thousand)

UMC	Change in This Month — (116,769	Balance as of period end — 1,909,154	Limit of endorsements — 76,341,239
UMC’s subsidiaries	0	0	7,667,103
UMC endorses for subsidiaries	0	0	0
UMC’s subsidiaries endorse for UMC	0	0	0
UMC endorses for PRC companies	0	0	0
UMC’s subsidiaries endorse for PRC companies	0	0	0

4) Financial derivatives transactions

a Hedging purpose : NT$ thousand

Financial instruments	Forwards	Interests SWAP
Deposit Paid	0	0
Royalty Income (Paid)	0	0
Unwritten-off Trading Contracts	0	0
Net Profit from Fair Value	0	0
Written-off Trading Contracts	0	0
Realized profit (loss)	0	0

b Trading purpose : NT$ thousand

Financial instruments	Credit-linked Deposits
Deposit Paid	0
Unwritten-off Trading Contracts	19,149,112
Net Profit from Market Value	(1,178,131	)
Written-off Trading Contracts	0
Realized profit (loss)	0

Exhibit 99.11

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To announce related materials on acquisition of machinery and equipment

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: 2005/10/11~2006/10/09

3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total transaction price: Transaction volume: one lot; average unit price: $ 589,860,414 NTD; total transaction price:$ 589,860,414 NTD

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): BOC EDWARDS; 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

Exhibit 99.12

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United Microelectronics Corporation

For the month of September, 2006

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, 2006.

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

Title	Name	Number of shares held as of August 31, 2006	Number of shares held as of September 30, 2006	Changes
Vice President	Henry Liu	11,922,588	11,902,588	(20,000	)
Vice President	Shih-Wei Sun	15,388,644	14,555,644	(833,000	)
Vice President	Ing-Ji Wu	12,092,001	12,032,001	(60,000	)
Vice President	Wen-Yang Chen	4,547,599	3,047,599	(1,500,000	)
Vice President	Lee Chung	531,546	461,546	(70,000	)
Vice President	Po-Wen Yen	1,462,551	1,312,551	(150,000	)

Note: Shares transferred to children.

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

Title	Name	Number of shares pledge as of August 31, 2006	Number of shares pledge as of September 30, 2006	Changes
—	—	—	—	—

3) The acquisition assets (NT$ Thousand)

Description of assets	September	2006
Semiconductor Manufacturing Equipment	5,141,118	20,904,548
Fixed assets	34,483	294,271

4) The disposition of assets (NT$ Thousand)

Description of assets	September	2006
Semiconductor Manufacturing Equipment	14,950	212,815
Fixed assets	0	0