Form 6-K UNITED MICROELECTRONICS For: Feb 25

                                                                        www.umc.com

Exhibit

Exhibit Description

1

Exhibit 99.1

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2015/12/01~2016/01/27
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $860,441,400; total transaction price: $ $860,441,400
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

2

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2016/01/01~2016/01/27
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: NT$1,099,366,493; total transaction price: NT$1,099,366,493
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): 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

3

Exhibit 99.3

UMC announced its operating results for the fourth quarter of 2015

1. Date of occurrence of the event: 2016/01/27
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: N/A
6. Content of the report: N/A
7. Cause of occurrence: UMC Reports fourth Quarter 2015 Results 2015 full year foundry revenue up 9%; EPS up 11% YoY to NT$1.08 United Microelectronics Corporation (NYSE: UMC; TWSE: 2303) (“UMC” or “The Company”), a leading global semiconductor foundry, today announced its consolidated operating results for the fourth quarter of 2015.
Fourth quarter consolidated revenue was NT$33.85 billion, a 4.2% decrease from NT$35.32 billion in 3Q15 and a YoY decline of 9.1% from NT$37.24 billion in 4Q14. 4Q15 consolidated gross margin was 20.6%, with operating margin at 5.6%. Net income attributable to stockholders of the parent was NT$3.16 billion, with earnings per ordinary share of NT$0.25. For 2015, full year revenue was NT$144.83 billion, with NT$10.84 billion in operating income, NT$13.45 billion net income attributable to stockholders of parent and NT$1.08 earnings per share.
Po-Wen Yen, CEO of UMC, said “In the fourth quarter of 2015, UMC’s foundry revenue declined 4.2% sequentially to NT$33.59 billion, due to continued inventory correction within the semiconductor industry. Wafer shipments reached 1.38 million 8-inch equivalent wafers, bringing overall capacity utilization rate to 83%. Our 28nm technology constituted 11% of 4Q15 revenue. For full year 2015, our foundry revenue grew 9% over 2014, aided by a 5% increase in total manufacturing capacity, higher blended ASP due to increased advanced node contribution and overall loading of approximately 90%. Our 28nm business tripled in 2015, propelled by strong demand from the communication sector. Furthermore, we have introduced a refined 28nm High-K Metal Gate (HKMG) process variation for communication ICs called 28HPCU, which operates at the same speed range as 28nm HKMG, but with lower standby current to considerably extend battery life. UMC will continue to strengthen our 28nm technology roadmap with enhanced processes that raise chip performance while lowering power consumption. Besides 28nm technologies, we have also observed stronger demand for chips used in the automotive industry, on both 8” and 12” manufacturing processes. UMC customers are now migrating from consumer grade products to more stringent grade 1 and grade 0 semiconductors designed for critical automotive safety functions. These products include power management, display driver, imaging sensors, and microcontrollers. As more products begin to rely on UMC’s comprehensive ‘Automotive Service Package’, our exposure in the automotive supply chain will help generate a new revenue stream for our foundry business.” CEO Yen continued, “We are seeing signs of cyclical bottoming as most of our customers’ inventory has returned to reasonable levels. For the first quarter of 2016, we expect our foundry revenue to remain flat. UMC is optimistic on the growth outlook for the foundry industry, led by communication and consumer products. We anticipate positive momentum for our 28nm as new products scheduled to enter production throughout the year provide additional business traction. To meet increased demand, we plan to expand our 12” operations with Tainan Fab 12A phase 5 coming online and Xiamen Fab 12X currently under construction. UMC has budgeted 2016 CAPEX at approximately US$2.2 billion, which will mainly focus on adding 300mm capacity. As a key upstream supplier, we look forward to expanding our involvement in exciting new applications, which will enable UMC to sustain our momentum across the industry.”
First Quarter of 2016 Outlook & Guidance: Wafer Shipments: To remain flat
ASP in US$: ASP softness offset by favorable USD to NTD exchange rate
Profitability: Gross profit margin will be in high teens % range
Foundry Segment Capacity Utilization: Approximately low 80% range
2016 CAPEX for Foundry Segment: US$2.2bn
8. Countermeasures: N/A
9. Any other matters that need to be specified: N/A

4

Exhibit 99.4

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd. 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: 2016/01/20~2016/01/28
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: NT$2,439,532,469; total transaction price: NT$2,439,532,469
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

5

Exhibit 99.5

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2016/01/28
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: NT$1,532,518,306; total transaction price: NT$1,532,518,306
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

Exhibit 99.6

To clarify news reported by Economic Daily News on January 28, 2016

1. Date of occurrence of the event: 2016/01/28
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: Economic Daily News
6. Content of the report: UMC’s internal sales goal is to exceed 4 percent annual growth in revenue, which is better than the industry average growth rate.
7. Cause of occurrence: Media reports of UMC exceeding the estimated global foundry growth rate of 4% as our internal target and the related information can be referenced in our Q4 2015 Investor Conference material
8. Countermeasures: None
9. Any other matters that need to be specified: None

6

Exhibit 99.7

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2016/01/29~2016/02/03
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: NT$ 520,667,539; total transaction price: NT$ 520,667,539
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

Exhibit 99.8

To clarify news reported by Economic Daily News on January 28, 2016

1. Date of occurrence of the event: 2016/02/06
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: N/A
6. Content of the report: N/A
7. Cause of occurrence: N/A
8. Countermeasures: N/A
9. Any other matters that need to be specified:
UMC today announced that the recent 6.4 magnitude earthquake recorded in southern Taiwan in the early hours of February 6th had limited impact to UMC’s operations. All personnel are safe at UMC facilities. The automatic safety measures at Fab 12A in Tainan, Taiwan did trigger and an automatic equipment shutdown that affected work-in-progress wafers; however, normal operations are resuming and wafer shipments will not be affected. UMC’s Hsinchu fabs were not affected, and there will be no meaningful impact on UMC’s business.

7

Exhibit 99.9

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2016/02/04~2016/02/15
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $528,675,000; total transaction price: $528,675,000
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

Exhibit 99.10

Represent subsidiary United Semiconductor (Xiamen) Co., Ltd.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: 2016/01/28~2016/02/16
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $ 528,208,827; total transaction price: $ $ 528,208,827
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): 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

8

Exhibit 99.11

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: 2015/12/10~2016/02/18
3. Transaction volume (e.g. XX square meters, equivalent to XX p’ing), unit price, total Transaction volume: one batch; average unit price: $670,115,535 NTD; total transaction price:$ 670,115,535 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

Exhibit 99.12

United Microelectronics Corporation
February 05, 2016

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 January 2016.

9

Exhibit 99.13

United Microelectronics Corporation
For the month of January, 2016

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;

10

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