Form 4: Amkor CEO Sells 10,000 Shares Under Pre-Arranged Plan

Amkor Technology's President and CEO, Guillaume Marie Jean Rutten, sold 10,000 shares of common stock for approximately $44.8 per share under a pre-arranged trading plan.

Summary

• Guillaume Marie Jean Rutten, President and CEO of Amkor Technology, Inc., reported the sale of 10,000 shares of common stock.
• The transaction occurred on December 15, 2025.
• The shares were sold at a weighted average price of $44.8, with individual transactions ranging from $44.37 to $45.18.
• This sale was executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Rutten on June 06, 2025.
• Following this transaction, Mr. Rutten beneficially owns 336,699 shares of Amkor Technology common stock.

Sentiment

Score: 4

Explanation: The sale of shares by the CEO, even under a pre-arranged 10b5-1 plan, is generally viewed with slight caution by investors, as it represents a reduction in direct ownership by a key executive. However, the pre-planned nature mitigates significant negative sentiment.

Positives

• The sale was conducted under a Rule 10b5-1 trading plan, indicating it was pre-scheduled and not based on immediate, non-public information, which enhances transparency and reduces concerns about opportunistic insider trading.

Negatives

• A top executive selling shares, even under a 10b5-1 plan, can sometimes be perceived as a lack of confidence in the company's near-term stock performance by some investors.

Risks

• While the sale was pre-planned, significant insider selling by key executives could, over time, be interpreted by the market as a potential signal of reduced confidence in future growth prospects, which could impact investor sentiment.

Corporate Governance

Stakeholder Impact

• Shareholders: May view the sale with slight caution, but the 10b5-1 plan provides reassurance that the transaction was not based on new, undisclosed negative information.

Key Dates

Recommendation

This Form 4 reports a routine, pre-planned insider sale by the CEO. While insider selling can sometimes be a yellow flag, the execution under a Rule 10b5-1 plan significantly reduces its negative implications, as it indicates the decision to sell was made well in advance. The volume of shares sold (10,000) is not exceptionally large relative to the CEO's remaining holdings (336,699 shares) or the company's overall market capitalization. Therefore, this specific transaction alone is unlikely to signal a fundamental shift in the company's prospects or warrant a change in investment recommendation. Investors should continue to evaluate Amkor Technology based on its operational performance, financial results, and broader industry trends.

Keywords

Amkor Technology, AMKR, Insider Sale, Form 4, Guillaume Marie Jean Rutten, CEO, 10b5-1 Plan, Stock Transaction, Beneficial Ownership