Exhibit EX-99

99.1

Announcement on 2015/03/30: UMC will attend investor conferences on 2015/04/02

99.2

Announcement on 2015/04/01: To announce related materials on acquisition of machinery and equipment

99.3

Announcement on 2015/04/01: To announce related materials on acquisition of machinery and equipment

99.4

Announcement on 2015/04/10: Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.to announce related materials on acquisition of facilities and equipment

99.5

Announcement on 2015/04/14: To announce related materials on acquisition of machinery and equipment

99.6

Announcement on 2015/04/16: To announce related materials on acquisition of machinery and equipment

99.7

Announcement on 2015/04/21: To announce the differences for 2014 consolidated financial statements between TIFRSs and IFRSs as issued by the IASB

99.8

Announcement on 2015/04/22: To announce related materials on acquisition of machinery and equipment

99.9

Announcement on 2015/04/24: To clarify news reported by United Evening Express B3 on April 23, 2015

99.12

Announcement on 2015/04/15: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC

1. Date of the investor conference: 2015/04/02
2. Time of the investor conference: 01:15 PM
3. Location of the investor conference: W Hotel, Taipei
4. Brief information disclosed in the investor conference:

The Company will attend the “Asia Tech Tour” conference, held by Sanford C. Bernstein.

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: 2015/02/11~2015/04/01
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $560,630,800 NTD; total transaction price: $560,630,800 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): Applied Materials South East Asia 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
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: 2015/03/20~2015/04/01
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $2,600,458,950 NTD; total transaction price: $2,600,458,950 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 CORPORATION; 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
18. Any other matters that need to be specified: None

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.to announce related materials on
acquisition of facilities and equipment

1. Name and nature of the subject matter (e.g. land located at Sublot XX, Lot XX, North District, Taichung City): facilities and equipment
2. Date of the occurrence of the event: 2015/02/01~2015/04/10
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: NT$4,236,955,428; Total transaction price: NT$4,236,955,428
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): China Construction Second Engineering Bureau 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
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: 2014/04/24~2015/04/14
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $538,899,435 NTD; total transaction price: $538,899,435 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): Nikon Precision Taiwan 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
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: 2015/04/02~2015/04/16
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $1,234,891,225 NTD; total transaction price: $1,234,891,225 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 CORPORATION; 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
18. Any other matters that need to be specified: None

To announce the differences for 2014 consolidated financial statements between TIFRSs and IFRSs as
issued by the IASB

1. Date of occurrence of the event: 2015/04/21
2. Cause of occurrence: To announce the differences for 2014 consolidated financial statements between TIFRSs and IFRSs as issued by the IASB.
3. Content of overseas financial report required to be adjusted due to inconsistency in the accounting principles applied in the two places for (please enter in Chinese):

(1)Under International Financial Reporting Standards endorsed by the Financial Supervisory Commission of the Republic of China (TIFRSs), the Company reported consolidated net income attributable to the stockholders of the parent of NT$12,141,341 thousand, basic earnings per share of NT$0.97 and diluted earnings per share of NT$0.96 for the year ended December 31,2014. As of December 31, 2014, the Company reported total assets of NT$313,245,648 thousand, total liabilities of NT$88,236,797 thousand, non-controlling interests of NT$3,849,798 thousand, and equity attributable to the parent company of NT$221,159,053 thousand.

(2)For the purpose of filing the annual report on Form 20-F with the U.S. Securities and Exchange Committee (SEC), the Company prepared the consolidated financial statements in accordance with International Financial Reporting Standards (IFRSs) as issued by the International Accounting Standards Board (IASB) and reported consolidated net income attributable to the stockholders of the parent of NT$11,108,940 thousand, basic earnings per share of NT$0.90 and diluted earnings per share of NT$0.89 for the year ended December 31,2014. As of December 31, 2014, the Company reported total assets of NT$310,647,533 thousand, total liabilities of NT$90,308,500 thousand, non-controlling interests of NT$3,849,798 thousand, and equity attributable to the parent company of NT$216,489,235 thousand.

(3)The differences between the Company’s 2014 consolidated financial statements on the basis of TIFRSs and IFRSs as issued by the IASB were primarily related to the timing of the recognition of 10% tax on unappropriated earnings and the accounting treatment of treasury stock.

For more details, please refer to the 2014 Form 20-F we filed with the U.S. SEC.

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: 2015/02/09~2015/04/22
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $843,989,993 NTD; total transaction price: $843,989,993 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): Base on purchase order payment term.
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: None
16. Concrete purpose or use of the acquisition or disposition: For production
17. Do the directors have any objection to the present transaction?: Not applicable
18. Any other matters that need to be specified: None

1. Date of occurrence of the event: 2015/04/24
2. Company name: UNITED MICROELECTRONICS CORP.
3. Relationship to the Company (please enter “head office” or “subsidiaries”):head office
4. Reciprocal shareholding ratios: N/A
5. Name of the reporting media: United Evening Express B3
6. Content of the report: UMC¡GCapacity of 8” is still tight
7. Cause of occurrence: To clarify news reported by United Evening Express B3 on April 23, 2015
8. Countermeasures: N/A
9. Any other matters that need to be specified:

UMC did not disclose any information related to operating performance in the report. UMC can not comment on those reports made by a third party research organization.

1. Date of the investor conference: 2015/04/29
2. Time of the investor conference: 17:00
3. Location of the investor conference: Online teleconference
4. Brief information disclosed in the investor conference:

This is to report the changes or status of 1) Sales volume, 2) Funds lent to other parties, 3) Endorsements and guarantees, and 4) Financial derivative transactions for the period of March 2015.


Period	Items	2015		2014		Changes		%
March	Net sales		12,710,166		11,289,431		1,420,735		12.58	%
Year-to-Date	Net sales		37,649,644		31,693,585		5,956,059		18.79	%

Last Month

This Month

(actual amount

Balance as of period end

(actual amount provided)

provided)

Limit of lending

UMC

1,700,000

44,231,811

Note: On December 24, 2015, the board of directors resolved to provide endorsement to Nexpower’s syndicated loan from banks including Bank of Taiwan for the amount up to NT$ 1,700 million.

This is to report 1) the trading of directors, 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, executive officers and 10% shareholders of UMC;


		Number of
		shares as of		Number of shares as
Title	Name	February 28, 2015		of March 31, 2015		Changes
Vice President	Arthur Kuo		30,000		21,000		(9,000	)
Vice President	S S Hong		230,406		576,406		346,000
Associate Vice President	H B Lu		500,425		550,425		50,000

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

Number of shares

pledged as of

Title

Name

February 28, 2015

March 31, 2015

Changes

—