Summary
Updated Aug 31, 2026
John T. Kim is 10% Owner of AMKOR TECHNOLOGY, INC. (AMKR). 3 SEC Form 4 filings on record going back to 2025, most recently on 17 February 2026. Most recent open-market trade: sold $484.90M of AMKR on 17 February 2026. Lifetime open-market purchases: $9.65M. Lifetime open-market sales: $484.90M.
Recent Transactions
8Every recent SEC Form 4 transaction John T. Kim has reported, most recent first.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies John T. Kim files at. Multiple unrelated insiders buying the same stock within a short window, cluster buying, has historically been one of the strongest Form 4 signals.
- 915 Investments, LP - $484.90M of AMKR open-market activity in the last 12 months
- Guillaume Marie Jean Rutten - $9.35M of AMKR open-market activity in the last 12 months
- Mark N. Rogers - $3.05M of AMKR open-market activity in the last 12 months
- Gil C. Tily - $2.09M of AMKR open-market activity in the last 12 months
- Roger Anthony Carolin - $1.52M of AMKR open-market activity in the last 12 months
- Kevin Engel - $1.51M of AMKR open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
Frequently Asked Questions
Who is John T. Kim?
John T. Kim is a corporate insider, tracked as 10% Owner of AMKOR TECHNOLOGY, INC. (AMKR). InsiderAlpha holds 3 primary Form 4 filings for them, the earliest from 2025, updated as new SEC EDGAR filings are processed.
When did John T. Kim last file a Form 4?
The most recent primary Form 4 on record is dated 17 February 2026, one of 3 filings going back to 2025.
Has John T. Kim been buying or selling stock?
Recorded transactions: 1 open-market purchase ($9.65M) and 1 open-market sale ($484.90M) across all tracked filings.
Where can I see all of John T. Kim's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
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