Schedule 13G/A

2303 Schedule 13G/A filing by BlackRock

BlackRock reported beneficial ownership of 817.5M shares, representing 12% of UNITED MICROELECTRONICS CORP in this filing.

FiledApr 29, 2026

Ownership dateMar 31, 2026

Reported shares817.5M

Reported ownership12%

Ownership details

Voting and dispositive power reported in the filing

These figures describe the reporting filer’s disclosed voting and investment authority. They should be read together with the reported share count and percentage.

Sole voting power 771.6M

Shared voting power 817.5M

Sole dispositive power 817.5M

Shared dispositive power 817.5M

Source

Original filing and accession

Use the SEC filing as the primary source when you need the complete disclosure, footnotes, exhibits, or reporting-person details.

Reporting filer: BlackRock
CIK: CIK0002012383
Accession: 0002012383-26-001777
Form: Schedule 13G/A

Open SEC filing View 2303 ownership history

Read the filing in context

Understand what a Schedule 13 filing does—and does not—tell you.

How to read a Schedule 13G → Does a 13G mean the shares were just bought? → Filing date vs. ownership date →