UNITED MICROELECTRONICS CORP (UMC)

=== SEC Form 4 — Statement of Changes in Beneficial Ownership === Document Type: 4 Period of Report: 2026-07-13 10b5-1 Pre-arranged Plan: No --- Issuer --- Name: UNITED MICROELECTRONICS CORP (UMC) CIK: 0001033767 --- Reporting Owner --- Name: Liu Chitung CIK: 0002120081 Role: Officer (CFO & SVP) --- Non-Derivative Transactions --- [Transaction #1] Security: Common Shares Date: 2026-07-13 | Code: S (Open market sale) Shares: -1,900,000 | Price: $154.89 Total Value: $294,291,000.00 Shares Owned After: 3,322,917 | Ownership: D (Direct) Footnotes: [F1] New Taiwan Dollars [F2] Includes 1,210,000 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually on December 5 from 2026 to 2029. --- Holdings --- [Holding #1] Security: Common Shares Ownership: I (Indirect) [Holding #2] Security: Common Shares Ownership: I (Indirect) Footnotes: [F3] The shares are under Trust with Discretion Reserved. --- Footnotes (Complete Index) --- F1: New Taiwan Dollars F2: Includes 1,210,000 shares of Restricted Stock Award (RSA) and a specified number of shares subject to the RSA will vest annually on December 5 from 2026 to 2029. F3: The shares are under Trust with Discretion Reserved. --- Signature --- /s/ /s/Chitung Liu (2026-07-13)