[SCHEDULE 13G/A] UNITED MICROELECTRONICS CORP Amended Passive Investment Disclosure
BlackRock files 13G/A: 817,485,069 UMC shares
BlackRock, Inc. filed an amended Schedule 13G/A reporting beneficial ownership of 817,485,069 shares of United Microelectronics Corp common stock, representing 6.5% of the class.
BlackRock, Inc. filed an amended Schedule 13G/A reporting beneficial ownership of 817,485,069 shares of United Microelectronics Corp common stock, representing 6.5% of the class. The filing shows sole voting power for 771,583,164 shares and sole dispositive power for 817,485,069 shares.
The filing is signed by a Managing Director and includes Exhibit 24 (Power of Attorney) and Exhibit 99 (Item 7 information). The filing states the holdings reflect aggregated Reporting Business Units of BlackRock, Inc.
Positive
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Negative
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Insights
AMENDED 13G/A reports BlackRock holds 6.5% of UMC via aggregated business units.
The submission discloses 817,485,069 shares beneficially owned and quantifies both voting and dispositive powers. It follows the Schedule 13G/A template for passive investors but clarifies aggregation across Reporting Business Units per SEC Release No. 34-39538.
Investors should note this is a disclosure of position size and control attributes; it does not by itself indicate activist intent or changes in strategy. Subsequent filings may update percentages or ownership if transactions occur.
Key Figures
Beneficial ownership:817,485,069 sharesPercent of class:6.5%Sole voting power:771,583,164 shares+2 more
5 metrics
Beneficial ownership817,485,069 sharesAmount beneficially owned as reported on Schedule 13G/A
Percent of class6.5%Percent of common stock class beneficially owned
Sole voting power771,583,164 sharesNumber with sole power to vote or direct the vote
Sole dispositive power817,485,069 sharesNumber with sole power to dispose or direct disposition
Form typeSchedule 13G/AAmendment No. 3 filing classification
Key Terms
beneficially owned, sole dispositive power, Schedule 13G/A
3 terms
beneficially ownedregulatory
"reflects the securities beneficially owned, or deemed to be beneficially owned"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
sole dispositive powerregulatory
"Sole Dispositive Power 817,485,069.00"
Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.
Schedule 13G/Aregulatory
"form_type: SCHEDULE 13G/A"
A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What stake does BlackRock (UMC) report in United Microelectronics Corp?
BlackRock reports beneficial ownership of 817,485,069 shares, a 6.5% stake. The filing is an amended Schedule 13G/A aggregating holdings of Reporting Business Units and quantifies both voting and dispositive powers.
How many shares does BlackRock have voting power over in UMC?
BlackRock reports sole voting power for 771,583,164 shares. The Schedule 13G/A differentiates voting power from dispositive power and attributes holdings to Reporting Business Units under SEC guidance.
Does this Schedule 13G/A indicate BlackRock plans to control UMC?
The filing discloses ownership and power metrics but does not state control intent. Schedule 13G/A is typically used by passive investors; the amendment reports size and powers without declaring activist or control actions.
Who signed the amended Schedule 13G/A for BlackRock on behalf of the firm?
The filing is signed by Spencer Fleming, Managing Director, dated 04/29/2026. Exhibits include a Power of Attorney (Exhibit 24) and Item 7 subsidiary identification (Exhibit 99).
What CUSIP is associated with the reported UMC shares?
The filing lists CUSIP Y92370108 for United Microelectronics Corp common stock. The CUSIP identifies the specific class of common stock referenced in the beneficial ownership disclosure.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 3)
UNITED MICROELECTRONICS CORP
(Name of Issuer)
Common Stock
(Title of Class of Securities)
Y92370108
(CUSIP Number)
03/31/2026
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this Schedule is filed:
Rule 13d-1(b)
Rule 13d-1(c)
Rule 13d-1(d)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
Y92370108
1
Names of Reporting Persons
BlackRock, Inc.
2
Check the appropriate box if a member of a Group (see instructions)
(a)
(b)
3
Sec Use Only
4
Citizenship or Place of Organization
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
771,583,164.00
6
Shared Voting Power
0.00
7
Sole Dispositive Power
817,485,069.00
8
Shared Dispositive Power
0.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
817,485,069.00
10
Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)
11
Percent of class represented by amount in row (9)
6.5 %
12
Type of Reporting Person (See Instructions)
HC
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
UNITED MICROELECTRONICS CORP
(b)
Address of issuer's principal executive offices:
8F, NO.68, SEC. 1, NEIHU RD.,, TAIPEI, TAIWAN, 11493
Item 2.
(a)
Name of person filing:
BlackRock, Inc.
In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)
Address or principal business office or, if none, residence:
BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)
Citizenship:
See Item 4 of Cover Page
(d)
Title of class of securities:
Common Stock
(e)
CUSIP No.:
Y92370108
Item 3.
If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)
Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)
Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)
Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)
Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)
An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)
An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)
A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)
A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)
A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)
A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
817,485,069
(b)
Percent of class:
6.5%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
771,583,164
(ii) Shared power to vote or to direct the vote:
0
(iii) Sole power to dispose or to direct the disposition of:
817,485,069
(iv) Shared power to dispose or to direct the disposition of:
0
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of UNITED MICROELECTRONICS CORP. No one person's interest in the common stock of UNITED MICROELECTRONICS CORP is more than five percent of the total outstanding common shares.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
See Exhibit 99
Item 8.
Identification and Classification of Members of the Group.
Not Applicable
Item 9.
Notice of Dissolution of Group.
Not Applicable
Item 10.
Certifications:
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
