# EDGAR Filing Document

**Accession Number:** 0001033767
**File Stem:** 0001193125-26-286731
**Filing Date:** 2026-6
**Character Count:** 4863
**Document Hash:** d07546163c91b58c12b40130e6517138
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-286731.hdr.sgml**: 20260629

**ACCESSION NUMBER**: 0001193125-26-286731

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20260629

**FILED AS OF DATE**: 20260629

**DATE AS OF CHANGE**: 20260629

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** UNITED MICROELECTRONICS CORP
- **CENTRAL INDEX KEY:** 0001033767
- **STANDARD INDUSTRIAL CLASSIFICATION:** SEMICONDUCTORS & RELATED DEVICES [3674]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** F5
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-15128
- **FILM NUMBER:** 261131132

**BUSINESS ADDRESS:**
- **STREET 1:** 8F, NO.68, SEC. 1, NEIHU RD.,
- **CITY:** TAIPEI
- **STATE:** F5
- **ZIP:** 11493
- **BUSINESS PHONE:** 886-2-2658-9168

**MAIL ADDRESS:**
- **STREET 1:** 8F, NO.68, SEC. 1, NEIHU RD.,
- **CITY:** TAIPEI
- **STATE:** F5
- **ZIP:** 11493

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

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**FORM 6-K** 

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**REPORT OF FOREIGN ISSUER** 

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

**OF THE SECURITIES EXCHANGE ACT OF 1934** 

**June 29, 2026** 

**(Commission File Number: 001-15128)** 

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**United Microelectronics Corporation**

**(Translation of registrant's name into English)** 

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**No. 3 Li-Hsin 2nd Road, Hsinchu Science Park, Hsinchu, Taiwan, R.O.C.** 

**(Address of principal executive office)** 

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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): 

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**<u>SIGNATURES</u>** 

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.

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| | |
|:---|:---|
| United Microelectronics Corporation | United Microelectronics Corporation |
| By: | Chitung Liu |
| Name: | Chitung Liu |
| Title: | CFO |

---

Date: June 29, 2026

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**EXHIBIT INDEX** 

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| | |
|:---|:---|
| **Exhibit**  | **Description**  |
| <br>99.1 | <br>[<u>6K on 06/29/2026</u>](umc-ex99_1.htm) |

---

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## Exhibit 99.1

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;

![img208044986_0.jpg](img208044986_0.jpg)**www.umc.com**

**Exhibit**

<u>Exhibit</u> <u>Description</u> 

99.1 Announcement on 2026/06/29: Announcement of the completion of the 22nd stock buy-back plan by the company

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**Exhibit 99.1**

**Announcement of the completion of the 22nd stock buy-back plan by the company**

1. Originally determined ceiling on total monetary amount of the share repurchase (NTD): 212,951,478,175

2. Originally scheduled period for the repurchase: 2026/04/30~2026/06/29

3. Originally determined no. of shares to be repurchased (shares):

A maximum of 50,000,000 shares

4. Originally determined repurchase price range (NTD): 52.50 to 109.50 per share

5. Actual period of the current repurchase: 2026/05/05~2026/05/20

6. No. of shares currently repurchased (shares): 30,551,000

7. Total monetary amount of shares currently repurchased (NTD): 3,095,665,789

8. Current average repurchase price per share (NTD): 101.33

9. Cumulative no. of the company's own shares held (shares): 30,551,000

10. Cumulative no. of the company's own shares as a percentage of the total no. of the company's issued shares (%): 0.24%

11. Reason for non-completion of the current share repurchase:

In the consideration of the market conditions and shareholders' interest, the Company did not complete the execution of the share repurchase program at this time.

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

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