PETERS WILLIAM J 4
4 · Amphastar Pharmaceuticals, Inc. · Filed Mar 6, 2026
Research Summary
AI-generated summary of this filing
Amphastar CFO William J. Peters Sells 1,744 Shares
What Happened
- William J. Peters, Amphastar Pharmaceuticals' CFO, EVP & Treasurer and a director, had 1,744 shares withheld to satisfy tax withholding on vested restricted stock units (RSUs). The shares were recorded as disposed at $19.96 per share, for a total value of $34,810.
Key Details
- Transaction date: March 4, 2026
- Price: $19.96 per share
- Total shares withheld/disposed: 1,744 — total value $34,810
- Shares owned after transaction: not specified in the filing
- Footnotes: F1 — shares were withheld to satisfy tax liability on RSU vesting; F2 — filing notes inclusion of 545 shares acquired May 31, 2025 under the company ESPP
- Transaction code: F (tax withholding); filing submitted March 6, 2026 (no late-filing flag shown)
Context
- This was a tax-withholding disposition tied to RSU vesting (a common, administrative action), not an open-market sale intended to take profits. Such withholding is routine and does not necessarily signal the insider's view of the company's prospects.
Insider Transaction Report
Form 4
PETERS WILLIAM J
DirectorCFO, EVP & TREASURER
Transactions
- Tax Payment
Common Stock
[F1][F2]2026-03-04$19.96/sh−1,744$34,810→ 123,786 total
Footnotes (2)
- [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.
- [F2]Includes 545 shares acquired on May 31, 2025 under the Issuer's 2014 Employee Stock Purchase Plan.
Signature
/s/ William J. Peters|2026-03-06