Summary
Updated Aug 31, 2026
Yakob Liawatidewi is EVP CORP ADMIN CENTER of Amphastar Pharmaceuticals, Inc. (AMPH). 5 SEC Form 4 filings on record going back to 2024, most recently on 18 March 2026. Most recent open-market trade: sold $271K of AMPH on 8 November 2024. Lifetime open-market sales: $271K.
Recent Transactions
7Every recent SEC Form 4 transaction Yakob Liawatidewi has reported, most recent first.
Trading Pattern
InsiderAlpha's records for Yakob Liawatidewi go back to 2024: 5 primary Form 4 filings, an average of 1.7 per year. 3 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades in the last 12 months at the companies Yakob Liawatidewi 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.
- Floyd F. Petersen - $484K of AMPH open-market activity in the last 12 months
- Richard K. Prins - $275K of AMPH open-market activity in the last 12 months
- William J. Peters - $184K of AMPH 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 Yakob Liawatidewi?
Yakob Liawatidewi is a corporate insider, tracked as EVP CORP ADMIN CENTER of Amphastar Pharmaceuticals, Inc. (AMPH). InsiderAlpha holds 5 primary Form 4 filings for them, the earliest from 2024, updated as new SEC EDGAR filings are processed.
When did Yakob Liawatidewi last file a Form 4?
The most recent primary Form 4 on record is dated 18 March 2026, one of 5 filings going back to 2024.
Has Yakob Liawatidewi been buying or selling stock?
Recorded transactions: 0 open-market purchases and 1 open-market sale ($271K) across all tracked filings.
Where can I see all of Yakob Liawatidewi'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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