![James Topper](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="%231b1b1b" class="bi bi-person-fill" viewBox="0 0 16 16"><path d="M3 14s-1 0-1-1 1-4 6-4 6 3 6 4-1 1-1 1zm5-6a3 3 0 1 0 0-6 3 3 0 0 0 0 6"/></svg>)
James Topper
Director/Board Member at
PHATHOM PHARMACEUTICALS, INC.
Net worth: 5 M $ as of 2026-05-30
Profile
James N.
Topper founded Portola Pharmaceuticals LLC in 2011, where he worked as Independent Director from 2011 to 2013, Calistoga Pharmaceuticals, Inc. in 2006, where he worked as Chairman, and Incline Therapeutics, Inc. in 2010, where he worked as Director.
Dr. Topper also currently works at Intradigm Corp., as Chairman from 2006, Millendo Therapeutics US, Inc., as Director from 2012, Merganser Biotech, Inc., as Director, and various other companies.
Dr. Topper also formerly worked at Frazier Lifesciences Acquisition Corp., as Chairman & Chief Executive Officer from 2020 to 2022, Arête Therapeutics, Inc., as Executive Chairman, AnaptysBio, Inc., as Chairman from 2015 to 2023, and various other companies.
Dr. Topper received his undergraduate degree from the University of Michigan and graduate degree and doctorate degree from Stanford University School of Medicine.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
ANAPTYSBIO, INC. 0.28% | 2025-01-30 | 80,812 ( 0.28% ) | 4 M $ | 2026-05-30 |
| 2026-05-18 | 32,096 ( 0.04% ) | 307 801 $ | 2026-05-30 |
James Topper active positions
| Companies | Position | Start |
|---|---|---|
| PHATHOM PHARMACEUTICALS, INC. | Director/Board Member | 2022-09-21 |
| FRAZIER LIFESCIENCES ACQUISITION CORPORATION | Director/Board Member | 2022-10-31 |
Frazier Management LLC
 Frazier Management LLC Investment ManagersFinance Frazier Healthcare Partners invests in companies located in the United States. The firm focuses on pharmaceuticals, healthcare services and medical products & distribution sectors. It provides financing for growth and transformation transactions. | Private Equity Investor | 2002-12-31 |
Entasis Therapeutics, Inc.
 Entasis Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops and manufactures drugs for infectious diseases | Director/Board Member | 2016-02-29 |
Lassen Therapeutics LLC
 Lassen Therapeutics LLC Miscellaneous Commercial ServicesCommercial Services Operates as a clinical stage company that develops and manufactures therapeutic antibody products | Director/Board Member | - |
Seraxis Holdings, Inc.
 Seraxis Holdings, Inc. Financial ConglomeratesFinance Functions as an investment holding company | Director/Board Member | - |
Enlaza Therapeutics, Inc.
 Enlaza Therapeutics, Inc. BiotechnologyHealth Technology Develops biological drugs and protein therapeutics | Director/Board Member | - |
Seraxis, Inc.
 Seraxis, Inc. Pharmaceuticals: MajorHealth Technology Develops cell therapy to treat diabetes | Director/Board Member | - |
Sudo Biosciences, Inc.
 Sudo Biosciences, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that designs and develops medicines that target the tyrosine kinase | Director/Board Member | - |
| ░░░░░░░ ░░░░░░░░░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | - |
Former positions of James Topper
| Companies | Position | End |
|---|---|---|
| ░░░░░░ ░░░░░░ ░░░░░░░░░ ░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | ░░░░░░░░░░ |
| ░░░░░░░░░░░ ░░░░ | ░░░░░░░░ | ░░░░░░░░░░ |
| ░░░░░░░ ░░░░░░░░░░░░ ░░░░░░░░░░░ ░░░░░░░░░░░ | ░░░░░ ░░░░░░░░░ ░░░░░░░ | ░░░░░░░░░░ |
| ░░░░░░ ░░░░░░░░░░░░░░░░ ░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | ░░░░░░░░░░ |
| ░░░░░░░ ░░░░░░░░░░░░░░░░ ░░░░ | ░░░░░░░░░░░░░░ ░░░░░░ | ░░░░░░░░░░ |
Training of James Topper
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
61
1st degree connections
50
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 50 |
|---|---|
COR Therapeutics, Inc.
 COR Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Researches and develops biopharmaceutical products for acute cardiovascular diseases | Health Technology |
La Jolla Pharmaceutical Co.
 La Jolla Pharmaceutical Co. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company which develops and commercializes patients life-threatening conditions | Health Technology |
Millennium Pharmaceuticals, Inc.
 Millennium Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Manufactures medicines for oncology treatment | Health Technology |
Frazier Management LLC
Frazier Management LLC Investment ManagersFinance Frazier Healthcare Partners invests in companies located in the United States. The firm focuses on pharmaceuticals, healthcare services and medical products & distribution sectors. It provides financing for growth and transformation transactions. | Finance |
CoTherix, Inc.
 CoTherix, Inc. Pharmaceuticals: MajorHealth Technology Develops therapeutic products | Health Technology |
Threshold Pharmaceuticals, Inc.
 Threshold Pharmaceuticals, Inc. BiotechnologyHealth Technology Operates as a biotechnology company | Health Technology |
Azelon Pharmaceuticals, Inc.
 Azelon Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops biopharmaceutical drugs for the treatment of osteoporosis | Health Technology |
Sierra Oncology, Inc.
 Sierra Oncology, Inc. BiotechnologyHealth Technology Develops novel therapeutic approaches for cancer and other diseases | Health Technology |
Amicus Therapeutics, Inc.
 Amicus Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops and manufactures novel medicines for rare diseases | Health Technology |
MacuSight, Inc.
 MacuSight, Inc. Pharmaceuticals: MajorHealth Technology Develops and manufactures pharmaceuticals products | Health Technology |
Portola Pharmaceuticals LLC
 Portola Pharmaceuticals LLC Pharmaceuticals: MajorHealth Technology Engages in development and commercialization of novel therapeutics | Health Technology |
Arête Therapeutics, Inc.
 Arête Therapeutics, Inc. Pharmaceuticals: OtherHealth Technology Develops and commercializes molecule drugs to treat cardiovascular diseases | Health Technology |
Intradigm Corp.
 Intradigm Corp. Pharmaceuticals: MajorHealth Technology Develops drugs and therapies | Health Technology |
AnaptysBio, Inc.
 AnaptysBio, Inc. BiotechnologyHealth Technology Operates as a clinical stage biotechnology company | Health Technology |
Metastatix, Inc.
 Metastatix, Inc. Pharmaceuticals: MajorHealth Technology Develops small moleclue drugs | Health Technology |
Calistoga Pharmaceuticals, Inc.
 Calistoga Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops and manufactures pharmaceutical products | Health Technology |
Alnara Pharmaceuticals, Inc.
 Alnara Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops protein therapeutics for the treatment of metabolic diseases | Health Technology |
Incline Therapeutics, Inc.
 Incline Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops pharmaceutical products | Health Technology |
Millendo Therapeutics US, Inc.
 Millendo Therapeutics US, Inc. Pharmaceuticals: MajorHealth Technology Operates as a holding company which develops a novel treatment for adrenal cancer | Health Technology |
Semnur, Inc.
 Semnur, Inc. Pharmaceuticals: MajorHealth Technology Operates as a clinical stage biopharmaceutical company that develops and commercializes non-opioid pain therapies | Health Technology |
Alpine Immune Sciences, Inc. /Old/
 Alpine Immune Sciences, Inc. /Old/ BiotechnologyHealth Technology Operates as a biotechnology company which develops cancer immunotherapy systems | Health Technology |
Stanford University
 Stanford University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Silence Therapeutics Plc
 Silence Therapeutics Plc Miscellaneous Commercial ServicesCommercial Services Engages in the research and development of novel pharmaceutical products | Commercial Services |
University of Michigan
 University of Michigan Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Amunix, Inc.
 Amunix, Inc. Pharmaceuticals: MajorHealth Technology Develops protein pharmaceuticals | Health Technology |
Sérum International, Inc.
 Sérum International, Inc. Wholesale DistributorsDistribution Services Distributes footwear for men, women and children | Distribution Services |
Laguna Pharmaceuticals, Inc.
 Laguna Pharmaceuticals, Inc. BiotechnologyHealth Technology Develops and manufactures biopharmaceutical products | Health Technology |
Rempex Pharmaceuticals, Inc.
 Rempex Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops and discovers new antibacterial drugs | Health Technology |
Allena Pharmaceuticals, Inc.
 Allena Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Manufactures and retails drugs through online | Health Technology |
Alcresta Therapeutics, Inc.
 Alcresta Therapeutics, Inc. Pharmaceuticals: OtherHealth Technology Develops enzyme-based products that deliver enzymatic solutions to those living with rare diseases | Health Technology |
Acerta Pharma BV
 Acerta Pharma BV Pharmaceuticals: GenericHealth Technology Develops drugs for oncology and autoimmune diseases | Health Technology |
Stanford University School of Medicine
 Stanford University School of Medicine Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Merganser Biotech, Inc.
 Merganser Biotech, Inc. BiotechnologyHealth Technology Provides biotechnology services | Health Technology |
Entasis Therapeutics, Inc.
Entasis Therapeutics, Inc. Pharmaceuticals: MajorHealth Technology Develops and manufactures drugs for infectious diseases | Health Technology |
FHM Life Sciences VIII LLC | |
Aptinyx, Inc.
 Aptinyx, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that develops therapies to treat disorders of the brain and nervous system | Health Technology |
Sojournix, Inc.
 Sojournix, Inc. BiotechnologyHealth Technology Operates in the healthcare industry focusing on biotechnology business | Health Technology |
Alpine Immune Sciences, Inc.
 Alpine Immune Sciences, Inc. Pharmaceuticals: MajorHealth Technology Operates as an bio pharmaceutical company that develops immunotherapies for autoimmune and inflammatory diseases | Health Technology |
Mavupharma, Inc.
 Mavupharma, Inc. Pharmaceuticals: MajorHealth Technology Manufactures and distributes pharmaceutical products | Health Technology |
Amunix Pharmaceuticals, Inc.
 Amunix Pharmaceuticals, Inc. BiotechnologyHealth Technology Develops transformative T cell engagers (TCEs) and cytokine therapies for patients with cancer | Health Technology |
Entasis Therapeutics Holdings, Inc.
 Entasis Therapeutics Holdings, Inc. Miscellaneous Commercial ServicesCommercial Services Operates as a clinical biopharmaceutical company that engages in development of antibacterial products | Commercial Services |
Phathom Pharmaceuticals, Inc.
 Phathom Pharmaceuticals, Inc. Pharmaceuticals: MajorHealth Technology Develops and commercializes novel treatments for gastrointestinal diseases and disorders | Health Technology |
Seraxis, Inc.
Seraxis, Inc. Pharmaceuticals: MajorHealth Technology Develops cell therapy to treat diabetes | Health Technology |
Lassen Therapeutics LLC
Lassen Therapeutics LLC Miscellaneous Commercial ServicesCommercial Services Operates as a clinical stage company that develops and manufactures therapeutic antibody products | Commercial Services |
Frazier Lifesciences Acquisition Corp.
 Frazier Lifesciences Acquisition Corp. Financial ConglomeratesFinance Operates as a blank check company | Finance |
Seraxis Holdings, Inc.
Seraxis Holdings, Inc. Financial ConglomeratesFinance Functions as an investment holding company | Finance |
Enlaza Therapeutics, Inc.
Enlaza Therapeutics, Inc. BiotechnologyHealth Technology Develops biological drugs and protein therapeutics | Health Technology |
Sudo Biosciences, Inc.
Sudo Biosciences, Inc. Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that designs and develops medicines that target the tyrosine kinase | Health Technology |
NewAmsterdam Pharma Co. NV
 NewAmsterdam Pharma Co. NV Pharmaceuticals: MajorHealth Technology Operates as a biopharmaceutical company that researches, develops, manufactures and commercializes transformative therapies for cardio-metabolic diseases | Health Technology |
Attovia Therapeutics
 Attovia Therapeutics Medical SpecialtiesHealth Technology Manufactures pipeline for bio therapeutics to immune-mediated diseases including cancer | Health Technology |
- Stock Market
- Insiders
- James Topper
