Form 4: Amkor CEO Sells 10,000 Shares Under 10b5-1 Plan

Amkor Technology's President and CEO, Guillaume Rutten, sold 10,000 shares of common stock for a weighted average price of $31.68 per share, executed under a pre-arranged 10b5-1 trading plan.

Summary

• Guillaume Marie Jean Rutten, President and CEO of Amkor Technology, Inc. (AMKR), reported a sale of common stock.
• The transaction involved 10,000 shares of common stock.
• The shares were sold on November 17, 2025, at a weighted average price of $31.68 per share.
• The sale was executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Rutten on June 6, 2025.
• Following this transaction, Mr. Rutten beneficially owns 346,699 shares of Amkor Technology common stock.
• The shares were sold in multiple transactions within a price range of $31.03 to $32.05.

Sentiment

Score: 4

Explanation: The sale of shares by the CEO, even under a pre-arranged 10b5-1 plan, can be perceived with slight caution by investors. However, the planned nature of the transaction reduces the immediate negative signal.

Positives

• The sale was conducted under a pre-arranged Rule 10b5-1 trading plan, indicating a planned transaction rather than an immediate reaction to new information.

Negatives

• Insider selling, even if planned, can sometimes be perceived negatively by investors as it reduces management's direct equity stake in the company.

Risks

• Potential negative investor sentiment or misinterpretation of the insider sale as a lack of confidence, despite being a planned transaction.

Future Outlook

NA

Management Comments

• The Reporting Person hereby undertakes to provide, upon request, to the staff of the Securities and Exchange Commission, Amkor Technology, Inc. (the "Issuer"), or any security holder of the Issuer, full information regarding the number of shares sold at each separate price within the range set forth in this footnote (2) to this Form 4.

Industry Context

NA

Corporate Governance

Stakeholder Impact

• Shareholders: May interpret the CEO's sale as a slight reduction in direct alignment of interests, though the 10b5-1 plan mitigates this.

Key Dates

Recommendation

The filing reports a planned insider sale by the CEO, which is a routine event for executives managing their personal finances. While insider selling can sometimes be viewed negatively, the execution under a Rule 10b5-1 plan adopted several months prior suggests it is not based on new, adverse material information. This single transaction does not provide sufficient new information to warrant a change in investment recommendation, thus a 'hold' stance is appropriate, pending further company-specific or market-wide developments.

Keywords

Amkor Technology, AMKR, Insider Trading, Form 4, Guillaume Rutten, Stock Sale, 10b5-1 Plan, CEO, Semiconductor Packaging, Test Services