# EDGAR Filing Document

**Accession Number:** 0001033767
**File Stem:** 0001193125-26-092413
**Filing Date:** 2026-3
**Character Count:** 6801
**Document Hash:** 95b09713870b2270dfdb6b55c632cbb6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-092413.hdr.sgml**: 20260305

**ACCESSION NUMBER**: 0001193125-26-092413

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20260305

**FILED AS OF DATE**: 20260305

**DATE AS OF CHANGE**: 20260305

**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:** 26724032

**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** 

------

**FORM 6-K** 

------

**REPORT OF FOREIGN ISSUER** 

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

**OF THE SECURITIES EXCHANGE ACT OF 1934** 

**March 5, 2026** 

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

------

**United Microelectronics Corporation**

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

------

**No. 3 Li-Hsin 2nd Road, Hsinchu 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): 

------

**<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.

---

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

---

Date: March 5, 2026

------

**EXHIBIT INDEX** 

---

| | |
|:---|:---|
| **Exhibit**  | **Description**  |
| <br>99 | <br>[<u>6K on 03/05/2026</u>](umc-ex99.htm) |

---

------

## Ex-99

&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;

![img239034952_0.jpg](img239034952_0.jpg)**www.umc.com**

**Exhibit**

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

99.1 Announcement on 2026/03/02: UMC will attend investor conferences on 2026/03/09

99.2 Announcement on 2026/03/02: UMC will attend investor conferences on 2026/03/11

99.3 Announcement on 2026/03/05: February Revenue

------

**Exhibit 99.1**

**UMC will attend investor conferences on 2026/03/09**

1. Date of institutional investor conference: 2026/03/09~2026/03/10

2. Time of institutional investor conference: 09:00 AM

3. Location of institutional investor conference: Shangri-La Far Eastern, Taipei

4. Outline of institutional investor conference:

The Company will attend the "2026 Taiwan Corporate Day", held by Citi.

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

------

**Exhibit 99.2**

**UMC will attend investor conferences on 2026/03/11**

1. Date of institutional investor conference: 2026/03/11~2026/03/12

2. Time of institutional investor conference: 09:00 AM

3. Location of institutional investor conference: Grand Hyatt Taipei

4. Outline of institutional investor conference:

The Company will attend the "Taiwan CEO-CFO Conference", held by J.P. Morgan.

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

------

**Exhibit 99.3**

**United Microelectronics Corporation**

March 5, 2026

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 February 2026.

1)Sales volume (NT$ Thousand)

---

| | | | | | |
|:---|:---|:---|:---|:---|:---|
| Period | Items | 2026 | 2025 | Changes | % |
| February | Net sales | 19345126 | 18193515 | 1151611 | 6.33% |
| Year-to-Date | Net sales | 40207276 | 38000310 | 2206966 | 5.81% |

---

2)Funds lent to other parties (NT$ Thousand): None

3)Endorsements and guarantees (NT$ Thousand): None

4)Financial derivatives transactions:

a Not under hedging accounting: NT$ thousand

***UMC***

---

| | | | | |
|:---|:---|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Financial instruments* | &nbsp;&nbsp;Option | &nbsp;&nbsp;Option | &nbsp;&nbsp;Forwards | &nbsp;&nbsp;IRS |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Financial instruments* | &nbsp;&nbsp;Put | &nbsp;&nbsp;Call | &nbsp;&nbsp;Forwards | &nbsp;&nbsp;IRS |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Deposit Paid* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Royalty Income (Paid)* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Unwritten-off Trading* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Contracts* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;685740 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Fair Value* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;8522 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Net profit (loss) from Fair Value* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;9176 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Written-off Trading* |  |  |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Contracts* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;1008616 | &nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;*Realized profit (loss)* | &nbsp;&nbsp;0 | &nbsp;&nbsp;0 | &nbsp;&nbsp;(2510) | &nbsp;&nbsp;0 |

---

------