Guillaume Marie Jean Rutten, a director at Amkor Technology, Inc. (NASDAQ: $AMKR), sold 25,000 shares on August 6, 2026, at $54.50 per share, for a total of $1,362,500. The transaction, executed on the open market, left him with 461,732 shares. He filed a Form 4 with the SEC the following day. That filing also disclosed a nearly identical sale from the previous session: 25,000 shares on August 5 at $55.35, bringing in $1,383,750. Combined, the two sales of 50,000 shares generated $2,746,250.
Rutten has sold Amkor shares regularly since at least September 2025. Filings from his time as chief executive officer show monthly open-market sales of 10,000 shares from September through December 2025, at prices between $30.00 and $44.80. By January 2026, his Form 4s listed his role as director. That month he sold 10,000 shares at $53.14. In February he sold another 10,000 at $45.89 on February 17, and 20,000 at $48.80 on February 24. His largest single disposal came on May 8, 2026, when he sold 50,000 shares at $74.28 — a $3,714,000 transaction.
Several other Amkor insiders also reported sales in 2026. Vice President Mark N. Rogers sold 5,000 shares on May 18 at $71.63 ($358,150) and another 5,000 on July 16 at $65.12 ($325,600). Chief Financial Officer Megan Faust sold 1,000 shares at $64.60 on May 19, valued at $64,600. Director Gil C. Tily disclosed a 15,000-share sale on May 11 at $77.30, totaling $1,159,500. No open-market insider purchases were reported during the period.
On the other side of the market, Senator Markwayne Mullin, Republican of Oklahoma, disclosed two purchases of Amkor shares in early 2026. He reported acquisitions on January 5 and February 4, each estimated at $15,001 based on the midpoint of the congressional disclosure range. The most recent congressional trade in $AMKR before those was a sale by Representative Michael T. McCaul in February 2014.
Amkor Technology, headquartered in Tempe, Arizona, provides semiconductor packaging and test services. Its market capitalization stood at approximately $13.38 billion as of its most recent reporting period.