UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN ISSUER

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

OF THE SECURITIES EXCHANGE ACT OF 1934

January 30, 2023

(Commission File Number: 001-15128)

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 Form 20-F or Form 40-F.

Form 20-F  ☒      Form 40-F  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (1): ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101 (b) (7): ☐

SIGNATURES

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, thereto duly authorized.

Date: January 30, 2023

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EXHIBIT INDEX

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                                                                        www.umc.com

Exhibit

Exhibit            Description

99.1                 Announcement on 2022/12/30: UMC will convene Q4 2022 Investor Conference

99.2                 Announcement on 2023/01/04: To announce the repurchase and cancellation of Currency Linked Zero Coupon Exchangeable Bonds due 2026

99.3                 Announcement on 2023/01/11: The change of Chief Information Security Officer

99.4                 Announcement on 2023/01/06: December Revenue

99.5                 Announcement on 2023/01/15: the trading and pledge of UMC common shares by directors, executive officers and 10% shareholders of UMC

Exhibit 99.1

UMC will convene Q4 2022 Investor Conference

1. Date of institutional investor conference: 2023/01/16

2. Time of institutional investor conference: 17:00

3. Location of institutional investor conference: Online teleconference

4. Outline of institutional investor conference:

UMC Q4 2022 Financial and Operating Results

5. Any other matters that need to be specified: None

Exhibit 99.2

To announce the repurchase and cancellation of Currency Linked Zero Coupon Exchangeable Bonds due 2026

1. Date of occurrence of the event: 2023/01/04

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. Cause of occurrence:

During the fourth quarter of 2022, the Company has repurchased US$20.6 million principal amount of Bonds and has cancelled such repurchased Bonds.

6. Countermeasures: None

7. Any other matters that need to be specified: None

Exhibit 99.3

The change of Chief Information Security Officer

1. Type of personnel changed (please enter: spokesperson, acting spokesperson, important personnel (CEO, COO, CMO, CSO, etc.), financial officer, accounting officer, corporate governance officer, chief information security officer, research and development officer, chief internal auditor, or designated and non-designated representatives):

Chief Information Security Officer

2. Date of occurrence of the change: 2023/01/11

3. Name, title, and resume of the previous position holder: S S Hong, Vice President

4. Name, title, and resume of the new position holder: TS Wu, Vice President

5. Type of the change (please enter: “resignation”, “position adjustment”, “dismissal”, “retirement”, “death” or “new replacement”): position adjustment

6. Reason for the change: position adjustment

7. Effective date: 2023/01/11

8. Any other matters that need to be specified: None

Exhibit 99.4

United Microelectronics Corporation

January 6, 2022

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 December 2022.

aNot under hedging accounting: NT$ thousand

UMC

Exhibit 99.5

United Microelectronics Corporation

For the month of December, 2022

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;