James N. Topper

Companies

• Attovia Therapeutics, Inc.Board member Aug 4, 2026 to now¹
• NewAmsterdam Pharma Co N.V.Board member Dec 29, 2023 to now²
• Phathom Pharmaceuticals, Inc.Board member Oct 24, 2019 to now³
• Alpine Immune SciencesBoard member Jul 26, 2017 to May 20, 2024⁴
• ANAPTYSBIO, INCBoard member Jan 25, 2017 to Jan 10, 2023⁵
• Frazier Lifesciences Acquisition CorpBoard member Dec 8, 2020 to Dec 17, 2020⁶
• Frazier Lifesciences Acquisition CorpChief executive officer Dec 8, 2020 to Dec 17, 2020⁶
• Allena Pharmaceuticals, Inc.Board member Nov 1, 2017 to Nov 18, 2020⁷
• Aptinyx Inc.Board member Jun 20, 2018 to Apr 2, 2020⁸
• Entasis TherapeuticsBoard member Sep 25, 2018 to Jan 22, 2019⁹
• Sierra Oncology, Inc.Board member Jul 15, 2015 to Feb 16, 2017¹⁰
• Amicus TherapeuticsBoard member May 30, 2007 to Jun 16, 2014¹¹
• La Jolla Pharmaceutical CompanyBoard member Feb 14, 2006 to Feb 26, 2009¹²

Holdings

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

Shares held

• NPNewAmsterdam Pharma Co N.V. NAMS3,801,000 shares¹³$77.1M at $20.29Sep 17, 2025
• PPPhathom Pharmaceuticals, Inc. PHAT70,630 shares¹⁴$496.2K at $7.03May 21, 2026

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

Recent filings

• May 19, 2026Granted 24,122 shares of Phathom Pharmaceuticals, Inc.¹⁴
• Sep 17, 2025U 17,199 shares at $1.95 of HilleVax, Inc.¹⁵
• Sep 17, 2025U 8,535,337 shares at $1.95 of HilleVax, Inc.¹⁵
• Sep 15, 2025Bought 660 shares at $23.70 of NewAmsterdam Pharma Co N.V.¹³
• Sep 8, 2025Bought 1,260 shares at $24.99 of NewAmsterdam Pharma Co N.V.¹⁶
• Aug 11, 2025Bought 471 shares at $23.98 of NewAmsterdam Pharma Co N.V.¹⁷
• Jun 25, 2025Bought 1,260 shares at $18.26 of NewAmsterdam Pharma Co N.V.¹⁸
• Jun 24, 2025Bought 2,520 shares at $18.43 of NewAmsterdam Pharma Co N.V.¹⁸
• Jun 16, 2025Bought 8,584 shares at $19.50 of NewAmsterdam Pharma Co N.V.¹⁹
• Jun 3, 2025Granted 10,500 shares of Phathom Pharmaceuticals, Inc.²⁰
• May 21, 2025Bought 3,780 shares at $3.86 of Phathom Pharmaceuticals, Inc.²¹
• May 14, 2025Bought 6,300 shares at $3.32 of Phathom Pharmaceuticals, Inc.²²
• May 13, 2025Bought 1,120 shares at $3.16 of Phathom Pharmaceuticals, Inc.²²
• May 12, 2025Bought 12,601 shares at $3.04 of Phathom Pharmaceuticals, Inc.²³
• May 9, 2025Bought 2,226 shares at $3.62 of Phathom Pharmaceuticals, Inc.²³
• May 9, 2025Bought 33,376 shares at $3.19 of Phathom Pharmaceuticals, Inc.²³
• Mar 26, 2025Bought 1,135 shares at $22.49 of NewAmsterdam Pharma Co N.V.²⁴
• Mar 4, 2025Bought 4,005 shares at $21.02 of NewAmsterdam Pharma Co N.V.²⁵
• May 23, 2024Granted 10,500 shares of Phathom Pharmaceuticals, Inc.²⁶
• May 18, 2024U 2,829,347 shares of CIK 1626199²⁷
• Apr 25, 2024Sold 19 shares at $64.57 of CIK 1626199²⁸
• Apr 25, 2024Exercised 1,200,000 shares of CIK 1626199²⁸
• Mar 26, 2024Bought 8,429 shares at $21.50 of NewAmsterdam Pharma Co N.V.²⁹
• Dec 11, 2023Exercised 145,251 shares at $12.74 of CIK 1626199³⁰
• May 25, 2023Granted 9,000 shares of Phathom Pharmaceuticals, Inc.³¹