Amphastar Pharmaceuticals, Inc.·4

Mar 10, 9:03 PM ET

PETERS WILLIAM J 4

Research Summary

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Amphastar (AMPH) CFO William J. Peters Withholds 2,146 Shares for Taxes

What Happened
William J. Peters (CFO, EVP & Treasurer, Director) had 2,146 shares withheld to satisfy tax liabilities tied to the vesting of restricted stock units (RSUs). The withholding was done at an effective price of $19.34 per share, representing $41,504 in value. This was a tax-withholding disposition (not an open-market sale or purchase).

Key Details

  • Transaction date: 2026-03-06; Filing date: 2026-03-10 (filed timely within Form 4 deadlines).
  • Withheld shares: 2,146 shares at $19.34 per share; total value ≈ $41,504.
  • Transaction code: F (shares withheld to satisfy tax liability); footnote: shares withheld to satisfy reporting person's tax liability in connection with RSU vesting.
  • Shares owned after transaction: not specified in the excerpt provided.

Context
This was a tax-withholding action following RSU vesting (a common administrative step) rather than an active sale that signals a change in conviction. Such withholdings reduce the insider's recorded share count but do not necessarily reflect a decision to liquidate holdings on the open market.