Liawatidewi Yakob 4
4 · Amphastar Pharmaceuticals, Inc. · Filed Mar 11, 2026
Research Summary
AI-generated summary of this filing
Amphastar (AMPH) EVP Liawatidewi Yakob Receives RSU Awards
What Happened
Liawatidewi Yakob, EVP Corporate Administration Center and a company director at Amphastar Pharmaceuticals, received equity awards on March 9, 2026: 35,450 restricted stock units (RSUs) and an additional 73,126 derivative award units (total 108,576 units) at $0.00 per share. On March 10, 2026, 1,870 shares were withheld (disposed) to satisfy tax liabilities at $18.91 per share, totaling $35,362. These transactions are awards and a routine tax-withholding, not open-market purchases.
Key Details
- Transaction dates: awards on 2026-03-09; tax-withholding on 2026-03-10. Form 4 filed 2026-03-11 (timely).
- Award specifics: 35,450 RSUs (grant A) and 73,126 derivative award units (A — derivative), both reported at $0.00 acquisition price.
- Withholding: 1,870 shares withheld at $18.91 each to cover taxes (total $35,362) (code F).
- Vesting: RSUs and derivative awards vest in four equal annual installments beginning March 9, 2027 (footnotes F1 and F4).
- Record holding: some shares are held of record by the Yakob and Sunmoon Trust dated July 25, 2013, for which Yakob is trustee (F3).
- Shares owned after the transactions were not specified on the Form 4.
Context
RSUs and similar derivative awards vest over time and are common executive compensation; the withholding of a small number of shares to satisfy taxes is a routine administrative action and not a directional trade. The derivative award is subject to the same multi-year vesting schedule. This filing does not indicate an open-market purchase or a voluntary sale beyond tax withholding.
Insider Transaction Report
- Award
Common Stock
[F1]2026-03-09+35,450→ 124,795 total - Tax Payment
Common Stock
[F2]2026-03-10$18.91/sh−1,870$35,362→ 122,925 total - Award
Employee Stock Option (right to buy)
[F4]2026-03-09+73,126→ 73,126 totalExercise: $19.21Exp: 2036-03-09→ Common Stock (73,126 underlying)
- 2,459(indirect: See footnote)
Common Stock
[F3]
Footnotes (4)
- [F1]The reported shares are represented by restricted stock units, or RSUs, which vest in four equal annual installments beginning on March 9, 2027.
- [F2]The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of RSUs.
- [F3]The reported shares are held of record by the Yakob and Sunmoon Trust dated July 25, 2013 for which the reporting person serves as a trustee.
- [F4]The shares subject to the option vest in four equal annual installments beginning on March 9, 2027.