Investor · Chapel Hill, NC

John R. Madden

Open John in the network graph →

Filings

7

SEC Form D

Connections

23

co-filers

Capital

$1.2M

across filings

Active

Mar 2022

to Oct 2025

Most-connected co-filers (23)

Jason Dempsey · Chapel Hill, NC5 shared Konstantin Savenkov · Berkeley, CA3 shared Grigory Sapunov · Berkeley, CA3 shared Jeff Wolf · Morrisville, NC3 shared Steven A. Shallcross · Rockville, MD3 shared Jeffrey J. Kraws · Rockville, MD3 shared John J. Monahan · Rockville, MD3 shared Alexander Nevinskiy · DOVER, DE3 shared Emma R. Bryant · Cheshire, United Kingdom3 shared Simon R. Whiteley · Cheshire, United Kingdom3 shared Dmitry Vinogradov · San Francisco, CA3 shared Brian C. Mcbride · Luxembourg, Luxembourg2 shared N. White River Value Advisors, Llc · Chapel Hill, NC2 shared Mark W. Yusko · Chapel Hill, NC2 shared N. White River Value Advisors, Llc · Chapel Hill, NC2 shared Chase P. Thomet · La Jolla, CA2 shared Jamie M. Purdy · St. Helier, Y92 shared Yotam Mann · Brooklyn, NY2 shared Maggie P. Schmitt · Baltimore, MD2 shared Khalid Malik · Dallas, TX2 shared Nathan Kline · New York, NY2 shared Susan K. Harvish · Schaumburg, IL2 shared Chris Deaner · Brooklyn, NY1 shared

Recent filings (7)

Theriva Biologics, Inc.Oct 2025 · 11 co-filers$13.1M White River European Value Fund, LPMay 2024 · 10 co-filers Never Before Heard Sounds, Inc.May 2023 · 4 co-filers$500K White River European Value Fund, LPMay 2023 · 10 co-filers Synthetic Biologics, Inc.Aug 2022 · 11 co-filers$3.0M Never Before Heard Sounds, Inc.Mar 2022 · 2 co-filers$3.0M Synthetic Biologics, Inc.Mar 2022 · 11 co-filers$1.5M

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