Mary Z. Luo

Companies

• Amphastar Pharmaceuticals, Inc.Chair Mar 30, 2015 to now¹
• Amphastar Pharmaceuticals, Inc.Chief operating officer Jun 24, 2014 to now²
• Amphastar Pharmaceuticals, Inc.Chief executive officer Mar 17, 2022 to Mar 8, 2023³
• Amphastar Pharmaceuticals, Inc.Board member Jun 24, 2014 to Mar 8, 2023²

Holdings

Stock this person has reported owning, from the forms officers and directors file with the SEC. See the biggest insider stakes.

Shares held

• APAmphastar Pharmaceuticals, Inc. AMPH9,661,796 shares⁴$251.2M at $26.00Mar 10, 2026

As of each latest filing. The line shows shares held over time.

Recent filings

• Mar 6, 2026Shares withheld for tax 3,077 shares at $19.34 of Amphastar Pharmaceuticals, Inc.⁴
• Mar 6, 2026Shares withheld for tax 7,773 shares at $19.34 of Amphastar Pharmaceuticals, Inc.⁴
• Mar 4, 2025Shares withheld for tax 2,426 shares at $27.62 of Amphastar Pharmaceuticals, Inc.⁵
• Mar 4, 2025Shares withheld for tax 5,753 shares at $27.62 of Amphastar Pharmaceuticals, Inc.⁵
• Nov 11, 2024Gift 125,000 shares of Amphastar Pharmaceuticals, Inc.⁶
• Nov 11, 2024Gift 125,000 shares of Amphastar Pharmaceuticals, Inc.⁶
• Mar 17, 2024Shares withheld for tax 7,052 shares at $43.05 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 17, 2024Shares withheld for tax 15,768 shares at $43.05 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 15, 2024Shares withheld for tax 202,658 shares at $43.05 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 15, 2024Exercised options 310,930 shares at $12.46 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 15, 2024Shares withheld for tax 408,721 shares at $43.05 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 15, 2024Exercised options 722,046 shares at $12.46 of Amphastar Pharmaceuticals, Inc.⁷
• Mar 6, 2024Shares withheld for tax 2,990 shares at $46.31 of Amphastar Pharmaceuticals, Inc.⁸
• Mar 6, 2024Shares withheld for tax 7,031 shares at $46.31 of Amphastar Pharmaceuticals, Inc.⁸
• Jan 9, 2024Sold 3,714 shares at $58.35 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 9, 2024Sold 31,764 shares at $57.70 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 9, 2024Sold 50,678 shares at $56.70 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 2,152 shares at $63.27 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 1,663 shares at $61.81 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 4,261 shares at $61.19 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 27,563 shares at $59.99 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 37,865 shares at $59.24 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 41,282 shares at $58.25 of Amphastar Pharmaceuticals, Inc.⁹
• Jan 8, 2024Sold 18,858 shares at $56.98 of Amphastar Pharmaceuticals, Inc.⁹
• Mar 17, 2023Shares withheld for tax 7,052 shares at $36.29 of Amphastar Pharmaceuticals, Inc.¹⁰