Fundraising Fox
Jack Nielsen
InvestorManaging Partner at Vivo Capital
Palo Alto, California
Writes $10M – $50M checks · typically $25M
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About
Jack Nielsen is a Managing Partner at Vivo Capital with over two decades of experience in life science venture capital investing. He focuses on therapeutics across all development stages and revenue-stage medical devices, with geographic emphasis on the US and EU markets.
Contact· self-published, not guessed
Deals · 5
Aligos TherapeuticsBoard seat
via Vivo Capital · filed Nov 2023 · $92.2M raise
MediaspaceBoard seat
via Vivo Capital · filed Dec 2021 · $22M raise
REATA PHARMACEUTICALS INCBoard seat
via Vivo Capital · filed Jun 2020 · $50M raise
Harmony BiosciencesBoard seat
via Vivo Capital · filed Aug 2019 · $50M raise
Crinetics PharmaceuticalsBoard seat
via Vivo Capital · filed Feb 2018 · $65M raise
Attribution from SEC filings, press coverage, and firm rosters.
Other disclosed investments
Investor
Akebia TherapeuticsAlios BiopharmaAlx OncologyAnokionClasp TherapeuticsInspirnaIO BiotechMaculogixMediQuest TherapeuticsMerusNeomendProteinSimpleReata PharmaceuticalsTobira Therapeutics
Sources: SEC Form D filings · curated public sources.
Colleagues at Vivo Capital
Network1
Investors connected to Jack in public investor directories — a warm-intro map.
Frequently asked questions
- Who is Jack Nielsen?
- Jack Nielsen is a Managing Partner at Vivo Capital with over two decades of experience in life science venture capital investing. He focuses on therapeutics across all development stages and revenue-stage medical devices, with geographic emphasis on the US and EU markets.
- Where does Jack Nielsen work?
- Jack Nielsen is Managing Partner at Vivo Capital.
- What check size does Jack Nielsen write?
- Jack Nielsen typically writes checks of $10M – $50M.
- What boards does Jack Nielsen sit on?
- Jack Nielsen holds tracked board seats at Aligos Therapeutics, Crinetics Pharmaceuticals, Harmony Biosciences, Mediaspace, REATA PHARMACEUTICALS INC.
- What companies has Jack Nielsen invested in?
- Investments tracked here include Akebia Therapeutics, Alios Biopharma, Alx Oncology, Anokion, Clasp Therapeutics, Crinetics Pharmaceuticals, Inspirna, IO Biotech, Maculogix, MediQuest Therapeutics, Merus, Neomend, and 3 more.
About this profile. Compiled from public sources — Vivo Capital's own website, regulatory filings and public professional profiles — and summarised by Fundraising Fox; every fact is kept with where it came from. Spotted an error, or would rather not be listed? Email privacy@fundraisingfox.com · How we build profiles · Your rights