About James Topper
James Topper is a director at Attovia Therapeutics.
Form D filings name James Topper as a director at Enlaza Therapeutics.
James Topper reports to the SEC as a director, officer or major shareholder of 21 public companies, including Phathom Pharmaceuticals (PHAT), MBX Biosciences (MBX) and NewAmsterdam Pharma Co N.V. (NAMS).
James Topper first appears on SEC filings in 2006.
Experience
This experience comes from SEC filings. The years are when the filings name James Topper in the role, so the role may have started earlier or lasted longer.
AI
Attovia Therapeutics, Inc.
Director
2026 · Public company (ATTO)
PI
Phathom Pharmaceuticals, Inc.
Director and 10% owner
2019 – 2026 · Public company (PHAT)
MI
MBX Biosciences, Inc.
10% owner
2024 – 2025 · Public company (MBX)
NV
NewAmsterdam Pharma Co N.V.
Director
2023 – 2025 · Public company (NAMS)
HI
HilleVax, Inc.
10% owner
2022 – 2025 · Public company (HLVX)
AI
Alpine Immune Sciences, Inc.
Director and 10% owner
2017 – 2024 · Public company (ALPN)
AI
Arcutis Biotherapeutics, Inc.
10% owner
2020 – 2023 · Public company (ARQT)
AI
Anaptysbio, Inc.
Director and 10% owner
2017 – 2023 · Public company (ANAB)
FC
Frazier Lifesciences Acquisition Corp
Chief Executive Officer and director
2020 · Public company (FLAC)
AI
Allena Pharmaceuticals, Inc.
Director and 10% owner
2017 – 2020 · Public company (ALNA)
TI
Tarsus Pharmaceuticals, Inc.
10% owner
2020 · Public company (TARS)
AI
Aptinyx Inc.
Director and 10% owner
2018 – 2020 · Public company (APTX)
PI
Passage BIO, Inc.
10% owner
2020 · Public company (PASG)
EI
Entasis Therapeutics Holdings Inc.
Director and 10% owner
2018 – 2020 · Public company (ETTX)
MI
Mirum Pharmaceuticals, Inc.
10% owner
2019 · Public company (MIRM)
SI
Sierra Oncology, Inc.
Director and 10% owner
2015 – 2017 · Public company (SRRA)
GC
Glaukos Corp.
10% owner
2015 · Public company (GKOS)
CI
Collegium Pharmaceutical, Inc.
10% owner
2015 · Public company (COLL)
AI
Amicus Therapeutics, Inc.
Director and 10% owner
2007 – 2014 · Public company (FOLD)
PI
Portola Pharmaceuticals Inc.
Director
2013 · Public company (PTLA)
LC
LA Jolla Pharmaceutical Co.
Director
2006 – 2009 · Public company (LJPC)
Key Colleagues at Startups
The people James Topper works with at each company, as listed on that company's latest Form D.
Enlaza Therapeutics, Inc. · Form D, Sep 11, 2025
MM
Marcos Milla
Director
SS
Stephen Squinto
Director
TR
Tighe Reardon
Executive officer
JL
Jay Lichter
Director
SC
Shelley Chu
Director
SD
Sergio Duron
Chief Executive Officer and director
SM
Sanford Madigan
Executive officer