Amphastar Pharmaceuticals Director Lee Howard's Stock Transactions and Option Grant

This Form 4 filing discloses transactions by Amphastar Pharmaceuticals director Lee Howard. On June 1, 2026, Howard received 8,143 shares of common stock through restricted stock units (RSUs) that vest on June 1, 2027, and was granted 17,365 stock options with an exercise price of $18.42 that also vest on June 1, 2027. The following day, June 2, 2026, Howard disposed of 769 shares at $18.45 per share to cover tax liabilities related to the RSU vesting. Following these transactions, Howard holds 159,350 shares of common stock directly and 17,365 stock options. The filing represents standard director compensation activities including equity awards and tax withholding procedures.