UMC CFO & SVP Chitung Liu Sells 1.6M Common Shares

Executive Insider Sale Analysis: United Microelectronics Corp (UMC)

Transaction Summary

On September 16 and 17, 2026, Chitung Liu, Chief Financial Officer and Senior Vice President of United Microelectronics Corp, executed open-market sales totaling 1,600,000 Common Shares.

• September 16, 2026: 1,200,000 shares sold at an average price of NT$142.333 per share (NT$170,799,600 total).
• September 17, 2026: 400,000 shares sold at an average price of NT$145.000 per share (NT$58,000,000 total).
• Aggregate Proceeds: NT$228,799,600 (~US$7.1M+ depending on prevailing exchange rates).

Ownership & Post-Transaction Position

Following these dispositions:

• Direct Holdings: Decreased to 2,639,757 shares (which includes 1,126,840 shares under Restricted Stock Awards vesting annually through December 2029).
• Indirect Holdings: 150,000 shares held by spouse and 1,000,000 shares held under trust with discretion reserved (CTBC Bank Trust).

Key Takeaways & Significance

• Significance Level: High. A large-scale disposition of 1.6 million shares represents a meaningful reduction (~37.7%) of the CFO's direct unvested/vested equity base.
• Rule 10b5-1 Plan: The filing indicates that this transaction was not conducted pursuant to an affirmative Rule 10b5-1 trading arrangement (aff10b5One = false).