/Investor DB

JJDC — Full Portfolio

12 tracked investments · listed companies and verified rows first

Contineum Therapeuticscontineum-tx.cominNASDAQ: CTNM

Contineum is a biopharmaceutical company developing small molecule drug candidates to treat inflammatory and fibrotic diseases by modulating critical disease pathways.

BiotechHealthtech

Carmine Stengone(President and Chief Executive Officer)inCarmine N. Stengone(President, Chief Executive Officer and Director)inPeter T. Slover(Chief Financial Officer)inDaniel S. Lorrain(Chief Scientific Officer)inTimothy R. Watkins(Chief Medical Officer and Head of Development)in

Co-investorsHadean VenturesRed Tree VentureSamsara BioCapitalCasdin CapitalFranklin TempletonSectoral Asset Management+1 more

Protagonist Therapeuticsprotagonist-inc.comin𝕏NASDAQ: PTGXJul 2015

Protagonist is a company that emphasizes a diverse and inclusive corporate culture as central to its innovation, with stated goals of creating wins for its organization and for patients.

BiotechHealthtechMilpitas, US

Dinesh V. Patel, PhD(Executive Officer, Director)Dinesh Patel(President & Chief Executive Officer)

BoardAsish K. Xavier, Ph.D.(Director)Michael Panaccio, Ph.D.(Director)Armen Shanafelt, Ph.D.(Director)Paul F. Truex(Director)

Co-investorsAisling CapitalCanaan PartnersJohnson & Johnson Innovation – JJDCLilly VenturesRA CapitalStarfish Ventures

Accent Therapeuticsaccenttx.comin𝕏Jan 2024

Accent Therapeutics is a biotechnology company focused on discovering and developing small molecule drugs to improve health outcomes for cancer patients.

BiotechHealthtechLongevity

Co-investorsAtlas VentureDroia VenturesEcoR1 CapitalGV (Google Ventures)The Column GroupJohnson & Johnson Innovation – JJDC+2 more

Aetionaetion.com

Healthcare technology company delivering real-world evidence for life sciences companies, payers, and regulators.

Data & InfrastructureDigital HealthHealthtechNew York, US

Sebastian G. Schneeweiss(Director)William Geary(Director)inJeremy Rassen(Executive Officer, Director)Kyle Armbrester(Chief Executive Officer)in

Co-investorsB Capital GroupB4 CapitalBlue Lion GlobalFlare Capital PartnersForesite CapitalLG Technology Ventures+6 more

BrainsGatebrainsgate.com

BrainsGate develops a neurostimulation therapy for stroke patients based on stimulation of the sphenopalatine ganglion (SPG) to increase cerebral blood flow.

BiotechHealthtechMedical Devices

Co-investorsAgate Medical Investments LPCipio PartnersElron VenturesPitangoSpero Ventures

Fusion Pharmaceuticalsfusionpharma.comin𝕏Apr 2019

Fusion Pharma develops targeted alpha therapeutics that link alpha-emitting medical isotopes to molecules targeting biomarkers on cancer cell surfaces to selectively kill tumor cells.

BiotechHealthtech

John Valliant(Founder)in

Co-investorsFACIT (Fight Against Cancer Innovation Trust)HealthCapLumira VenturesPivotal Life SciencesSeroba Life SciencesVenture Ontario+6 more

Mestagmestagtherapeutics.comin𝕏Mar 2026 · $40M

Mestag is an immunology company developing first-in-class treatments for cancer and inflammatory diseases by leveraging novel understanding of fibroblast biology and tertiary lymphoid structures.

AI & Machine LearningBiotechDigital HealthHealthtechLondon, GB

Michael B. Brenner(Founder)Chris Buckley(Founder)Mark Coles(Founder)inSoumya Raychaudhuri(Founder)David A. Tuveson(Founder)Lindsey Rolfe(Chief Medical Officer)in

Co-investorsGV (Google Ventures)SV Health InvestorsForbionJohnson & Johnson Innovation – JJDCNorthpond Ventures

Nucleomenucleome.comOct 2022

Nucleome develops 3D genomics technology to map genetic variants in the non-coding genome to the genes they dysregulate, with applications in understanding inflammatory diseases and discovering therapeutic targets.

AI & Machine LearningBiotechDeep Tech

Co-investorsM VenturesOxford Science EnterprisesPfizer Venture InvestmentsBritish Patient CapitalPfizer Ventures

PAQ Therapeuticspaqtx.cominMay 2025

Developing novel KRAS degraders.

Burlington, US

Huaixiang Hao(Founder)in

Co-investorsMRL Ventures FundBioTrack Capital

Ribon Therapeuticsribontx.cominJan 2019 · $65M

BiotechLexington, US

Victoria M. Richon(Executive Officer, Director)in

BoardCameron Wheeler(Director)Jonathan Root(Director)Laurence Lasky(Director)

Co-investorsAvego BioScience CapitalOUP (Osage University Partners)Peregrine VenturesAbbVieDeerfield Management CompanyNovartis Venture Fund+4 more

Rodin Therapeuticsrodintherapeutics.cominAug 2017

HealthtechCambridge, US

Adam Rosenberg(Executive Officer, Director)in

BoardBruce Booth(Director)inKees Been(Director)Samantha Singer(Director)

Co-investorsGV (Google Ventures)Hatteras Venture PartnersThird Point VenturesAtlas VentureRemeditex Ventures

Ronovo Surgicalronovosurgical.cominSep 2025 · $67M

Ronovo Surgical develops the Carina surgical robotics platform, including a vision system and instruments, for use by surgeons and hospitals.

HealthtechMedical DevicesRoboticsShanghai, CN

John Ma(Founder)inYing Mao(Founder)in

Co-investorsGranite AsiaINCE CapitalVivo CapitalLilly Asia Ventures

Other

Tracked investments with no reachable website or further public details — typically companies that wound down, renamed, or were absorbed.

RenovoX-Vax Technology

Rows marked “SEC filing” are inferred from directors named on the company's SEC Form D — public regulatory data, not a portfolio list published by the firm.