Amkor Technology Inc
Ownership
Ownership Structure
Who owns Amkor Technology Inc (AMKR)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 43.7% of the shares are freely tradable; institutional investors hold 51.3%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| BlackRock Inc | 4.95 | 12,292,760 | -5.2 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.91 | 9,712,553 | +6.8 | 06/30/2026 |
| Dimensional Fund Advisors, Inc. | 3.25 | 8,064,191 | -26.6 | 06/30/2026 |
| Vanguard Capital Management, LLC | 2.70 | 6,701,080 | +23.3 | 06/30/2026 |
| JPMorgan Chase & Co | 2.30 | 5,702,608 | +5.5 | 06/30/2026 |
| State Street Corp | 1.50 | 3,730,584 | +2.8 | 06/30/2026 |
| AQR Capital Management LLC | 1.30 | 3,231,546 | -0.3 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 1.91 | 4,732,900 | -7.7 | 09/30/2026 |
| iShares Core S&P Mid-Cap ETF | 1.78 | 4,425,288 | +0.0 | 09/30/2026 |
| Vanguard Small Cap Index | 1.35 | 3,353,925 | -9.5 | 09/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Kim Agnes C | Member of 10% owner group (4) | 11,187,355 | 413,932,135 $ | Jul 20, 2026 | indirect |
| Kim James J | 10% Owner | 511,645 | 18,930,865 $ | Jul 20, 2026 | direct |
| Rutten Guillaume Marie Jean | Director | 461,732 | 17,084,084 $ | Aug 6, 2026 | direct |
| Faust Megan | CFO | 133,105 | 4,924,885 $ | Oct 13, 2026 | direct |
| Rogers Mark N | EVP & General Counsel | 38,904 | 1,439,448 $ | Aug 17, 2026 | direct |
| Alexander Douglas A | Director | 29,109 | 1,077,033 $ | Oct 2, 2026 | direct |
| Churchill Winston J | Director | 28,681 | 1,061,197 $ | Jul 30, 2026 | direct |
| Engel Kevin K. | President and CEO | 9,666 | 357,642 $ | Jul 30, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Oct 13, 2026 | Faust Megan | CFO | Sell | 1,000 | 46.92 | 46,920 |
| Oct 2, 2026 | Alexander Douglas A | Director | Sell | 5,000 | 55.00 | 275,000 |
| Oct 2, 2026 | Alexander Douglas A | Director | Other | 5,000 | 8.51 | 42,550 |
| Sep 8, 2026 | Faust Megan | CFO | Sell | 1,000 | 49.05 | 49,050 |
| Aug 17, 2026 | Rogers Mark N | EVP & General Counsel | Sell | 5,000 | 59.78 | 298,900 |
| Aug 17, 2026 | Rogers Mark N | EVP & General Counsel | Other | 5,000 | 7.40 | 37,000 |
| Aug 11, 2026 | Faust Megan | CFO | Sell | 1,000 | 54.45 | 54,450 |
| Aug 7, 2026 | Alexander Douglas A | Director | Sell | 5,000 | 55.81 | 279,050 |
| Aug 7, 2026 | Alexander Douglas A | Director | Other | 5,000 | 8.51 | 42,550 |
| Aug 6, 2026 | Rutten Guillaume Marie Jean | Director | Sell | 25,000 | 54.50 | 1,362,500 |
| Aug 5, 2026 | Rutten Guillaume Marie Jean | Director | Sell | 25,000 | 55.35 | 1,383,750 |
| Jul 30, 2026 | Churchill Winston J | Director | Other | 100 | 0.00 | – |
| Jul 30, 2026 | Engel Kevin K. | President and CEO | Sell | 3,221 | 47.00 | 151,387 |
| Jul 20, 2026 | Kim Agnes C | Member of 10% owner group (4) | Other | 250,000 | 9.48 | 2,370,000 |
| Jul 20, 2026 | Kim Agnes C | Member of 10% owner group (4) | Other | 200,000 | 9.86 | 1,972,000 |
| Jul 20, 2026 | Kim James J | 10% Owner | Other | 250,000 | 9.48 | 2,370,000 |
| Jul 20, 2026 | Kim James J | 10% Owner | Other | 200,000 | 9.86 | 1,972,000 |
| Jul 16, 2026 | Rogers Mark N | EVP & General Counsel | Sell | 5,000 | 65.12 | 325,600 |
| Jul 16, 2026 | Rogers Mark N | EVP & General Counsel | Other | 5,000 | 7.40 | 37,000 |
| Jul 14, 2026 | Faust Megan | CFO | Sell | 1,000 | 69.91 | 69,910 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character. View all insider transactions →
Data as of: November 2, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.