PETERS WILLIAM J 4
4 · Amphastar Pharmaceuticals, Inc. · Filed Mar 17, 2026
Research Summary
AI-generated summary of this filing
Amphastar (AMPH) CFO William J. Peters Withholds 1,973 Shares for Taxes
What Happened
William J. Peters, Amphastar Pharmaceuticals' CFO, EVP & Treasurer and a company director, had 1,973 restricted stock units (RSU) shares withheld to satisfy his tax liability upon vesting. The withholding is reported as a disposition (code F) at $18.18 per share, for a total value of roughly $35,869. This is an administrative tax-withholding action tied to RSU vesting—not an open-market sale or purchase.
Key Details
- Transaction date: 2026-03-15; Filing date (Form 4): 2026-03-17 (filing appears timely).
- Shares withheld/disposed: 1,973 at $18.18 per share; total value ≈ $35,869.
- Shares owned after transaction: not specified in the filing.
- Footnote: F1 — shares were withheld to cover the reporting person’s tax liability in connection with RSU vesting.
- Transaction code: F (tax withholding related to RSU vesting), not a market sale (S) or purchase (P).
Context
Tax-withholding by withholding or surrendering vested RSUs is a common, routine administrative step and does not necessarily signal insider sentiment about the stock. For retail investors, purchases are generally more informative than withholding or routine dispositions like this one.
Insider Transaction Report
- Tax Payment
Common Stock
[F1]2026-03-15$18.18/sh−1,973$35,869→ 175,063 total
Footnotes (1)
- [F1]The reported shares were withheld to satisfy the reporting person's tax liability in connection with the vesting of restricted stock units, or RSUs.