Form 4 Filing for William J. Peters

William J. Peters, CFO, EVP & Treasurer of Amphastar Pharmaceuticals, Inc., reported a disposition of 1973 shares of Common Stock on March 15, 2026, with a transaction price of $18.18 per share. The shares were withheld to cover tax liabilities associated with the vesting of restricted stock units. Following the transaction, Mr. Peters owns 175,063 shares of Common Stock. The filing also notes that Mr. Peters is a director of the company.