Investing Profile

Jonathan Leff

InvestorVC
Partner at Deerfield Management
deerfield.com/team/jonathan-l...New York, New York
Photo of Jonathan Leff, Partner at Deerfield Management
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Current Investing Position
Deerfield Management Partner
Investment Range
$10.0M - $50.0M
Sweet Spot
$25.0M
Investments On Record
9

Jonathan Leff is on these Sector & Stage Rankings

Jonathan Leff's Investments On Record (7)

CompanyStageDateRound SizeTotal Raised
BIOMx
Post Ipo EquityFeb 2025$12M
Post Ipo EquityMar 2024$50M
$62M
Adaptive Phage Therapeutics
Series BMay 2021$41M
$61M
Co-investors: Martin Heidecker (AMR Action Fund)
Mirum Pharmaceuticals
Series ANov 2018$120M
$120M
Co-investors: Ed Mathers (New Enterprise Associates (NEA)), Patrick Heron (Frazier Healthcare Partners), Niall O’Donnell (RiverVest)
AveXis
Series DSep 2015$65M
Series CJan 2015$10M
$75M
Co-investors: Carole Nuechterlein (Roche Venture Fund)
Audentes Therapeutics
Series BDec 2014$43M
$140M
Co-investors: Kush Parmar (5am Ventures), Jonathan Silverstein (OrbiMed), Stephen Squinto (OrbiMed), Tom Woiwode (Versant Ventures)
Hana Biosciences
Private EquityJun 2010$100M
$100M
Altus Pharmaceuticals
Series CMay 2004$51M
$100M
Co-investors: Jonathan Root (U.S. Venture Partners (USVP))

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