Investor · San Francisco, CA

Jonathan Leff

Open Jonathan in the network graph →

Filings

27

SEC Form D

Connections

153

co-filers

Capital

$481.7M

across filings

Active

Jun 2010

to Jan 2026

Most-connected co-filers (153)

C. Boyd Clarke · New Haven, CT3 shared Tiba Aynechi · San Diego, CA3 shared Asher M. Rubin · Baltimore, MD3 shared Stephen C. Byrd · New York, NY3 shared Doug C. Pica · San Bruno, CA3 shared Kush Parmar · San Francisco, CA3 shared Cecilia J. Gonzalo · New Haven, CT3 shared Thomas Woiwode · San Francisco, CA3 shared William Butler · CONSHOHOCKEN, PA3 shared C. H. Johnson · Denver, CO3 shared R. C. Pica · Santa Rosa, CA3 shared Craig Kaplan · Capitola, CA3 shared Steven Waldman · Brooklyn, NY3 shared Harry H. Penner, Jr · Hampton, NJ3 shared Jonathan T. Silverstein · New York, NY3 shared Mark Leuchtenberger · Herzliya, L33 shared Matthew Patterson · San Francisco, CA3 shared Thomas J. Schuetz · Cambridge, MA3 shared Drew M. Pardoll, M.D., Ph.D · Baltimore, MD3 shared Robert Conerly · Southington, CT3 shared Edward J. Williams · Charlottesville, VA2 shared Elai R. Davicioni · San Diego, CA2 shared Tomas N. Tejero · Mexico DF, O52 shared Louis G. Lange · San Francisco, CA2 shared

Recent filings (27)

BiomX Inc.Jan 2026 · 9 co-filers$3.3M Elion Therapeutics, Inc.Jun 2024 · 7 co-filers$83.8M Elion Therapeutics, Inc.Jun 2024 · 7 co-filers$83.8M BiomX Inc.Apr 2024 · 27 co-filers$61.5M BiomX Inc.Apr 2024 · 27 co-filers$61.5M Avalyn Pharma Inc.Oct 2023 · 18 co-filers$189.2M Avalyn Pharma Inc.Oct 2023 · 18 co-filers$189.2M Dracen Pharmaceuticals, Inc.Aug 2023 · 7 co-filers$2.8M Dracen Pharmaceuticals, Inc.Aug 2023 · 7 co-filers$2.8M Innervace, Inc.Aug 2022 · 7 co-filers$40.0M Innervace, Inc.Aug 2022 · 7 co-filers$40.0M Dracen Pharmaceuticals, Inc.Nov 2021 · 9 co-filers$17.0M Dracen Pharmaceuticals, Inc.Nov 2021 · 9 co-filers$17.0M ARS Pharmaceuticals, Inc.Sep 2021 · 17 co-filers$55.0M ARS Pharmaceuticals, Inc.Sep 2021 · 17 co-filers$55.0M Avalyn Pharma Inc.May 2020 · 15 co-filers$35.7M Avalyn Pharma Inc.May 2020 · 15 co-filers$35.7M Mirum Pharmaceuticals, Inc.Nov 2018 · 13 co-filers$120.1M Mirum Pharmaceuticals, Inc.Nov 2018 · 13 co-filers$120.1M ARS Pharmaceuticals, Inc.Oct 2018 · 5 co-filers$20.0M ARS Pharmaceuticals, Inc.Oct 2018 · 5 co-filers$20.0M Dracen Pharmaceuticals, Inc.Jan 2018 · 9 co-filers$40.5M Dracen Pharmaceuticals, Inc.Jan 2018 · 9 co-filers$40.5M Part of the Plan Ltd Liability CoSep 2017 · 3 co-filers$1.3M Aprecia Pharmaceuticals CoJan 2016 · 19 co-filers$84.0M

Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Jonathan in the interactive graph →