SEC Filing Analysis: UNITED MICROELECTRONICS CORP (UMC)

Executive Summary

• Trading Significance: Low
• Key Takeaway: New Director Wang Su-Lin files initial statement of beneficial ownership (Form 3) disclosing 101,000 shares.
• Market Impact: Neutral - This is a procedural filing indicating no immediate buying or selling pressure.

Company Information

Field	Value
Company	UNITED MICROELECTRONICS CORP
Ticker Symbol	UMC
CIK	0001033767
Industry	Semiconductors & Related Devices

Insider Information

Field	Value
Name	Wang Su-Lin
CIK	0002120077
Relationship	Director

Transaction Details

Field	Value
Form Type	3 (Initial Statement)
Filing Date	2026/03/18
Security Type	Common Shares
Shares Owned	101,000
Ownership Type	Direct

Financial Impact Assessment

Materiality

• Transaction Value: N/A (Initial Disclosure)
• Shares Owned: 101,000
• % of Shares Outstanding: ~0.0008% (based on 12.59B shares)
• Materiality Assessment: Low

Impact Evaluation

• Market Cap Context: With a market capitalization of $762.26 billion, this holding is financially immaterial to the broader market structure.
• Ownership Concentration: The insider holds a negligible percentage of the total float.
• Transaction Significance: As a Form 3, this filing represents the establishment of a reporting baseline for a new insider rather than active trading.

Market Impact Analysis

Stock Impact Prediction

• Direction: Neutral
• Reasoning: Procedural filing with no capital flow implications.

Volume & Sentiment

• Expected Volume Impact: None.
• Sentiment Indicator: Neutral.

Additional Context

• Filing Type: Form 3 is filed when a person first becomes an insider (officer, director, or 10% owner). It discloses pre-existing holdings.