UMC (UMC) director Shyu Jyuo-Min becomes reporting insider with Form 3

Rhea-AI Filing Summary

UNITED MICROELECTRONICS CORP director files initial ownership report

UNITED MICROELECTRONICS CORP director Shyu Jyuo-Min has filed a Form 3, which is an initial statement of beneficial ownership of securities. This filing establishes the director’s reporting status for future insider transactions but does not list any trades in this report.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Shyu Jyuo-Min

(Last) (First) (Middle)

8F, NO.68, SEC. 1, NEIHU RD.,

(Street)

TAIPEI TAIWAN 11493

(City) (State) (Zip)

TAIWAN, PROVINCE OF CHINA

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
UNITED MICROELECTRONICS CORP [ UMC ]

3a. Foreign Trading Symbol
[2,303]

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

Exhibit 24 Power of Attorney.

No securities are beneficially owned.

	/s/Chitung Liu, attorney-in-fact	03/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 3: SEC 1473 (03-26)

FAQ

What does the UNITED MICROELECTRONICS CORP (UMC) Form 3 filing show?

The Form 3 shows that director Shyu Jyuo-Min is now a reporting insider of UNITED MICROELECTRONICS CORP. It is an initial ownership statement and does not report any share purchases or sales.

Does the UMC Form 3 for Shyu Jyuo-Min report any stock transactions?

No, this Form 3 does not report any stock transactions. It only establishes Shyu Jyuo-Min as a director-level insider subject to ongoing reporting of future trades in UMC securities.

Who is the reporting person in the UMC Form 3 filing?

The reporting person is Shyu Jyuo-Min, identified as a director of UNITED MICROELECTRONICS CORP. The filing confirms this role and begins formal insider reporting obligations for this individual.

Does the UMC Form 3 indicate any large insider buys or sells?

No, the Form 3 does not indicate any buys or sells. It is an initial ownership document, and the transaction summary shows no purchases, sales, gifts, or exercises in this filing.

Why is a Form 3 filing by a UMC director important for investors?

A Form 3 signals that an individual, here director Shyu Jyuo-Min, is now an insider whose future trades must be disclosed. This improves transparency around potential alignment between management and shareholder interests.