Investor · Minneapolis, MN

Douglas E. Mark

Open Douglas in the network graph →

Filings

34

SEC Form D

Connections

90

co-filers

Capital

$358.6M

across filings

Active

Aug 2017

to Jun 2024

Most-connected co-filers (90)

Brian J. Schneider · Minneapolis, MN23 shared Robert A. O'Sullivan · WEST PALM BEACH, FL11 shared Michael Murphy · New York, NY10 shared Kevin F. Didden · Branford, CT10 shared Walter Mccormack · NEW YORK, NY10 shared Randall S. Murphy · Mountain View, CA10 shared Arthur F. Rice · Pleasanton, CA10 shared Melissa W. Lang · New York, NY10 shared Kevin Merritt · Chelan, WA10 shared Marti Ogram · Santa Barbara, CA10 shared Andrew Phillips · NEW YORK, NY10 shared Katherine Radziwon · PORTLAND, OR10 shared David C. Brink · St. Paul, MN9 shared Gary C. Mccord · St. Paul, MN9 shared Jihad A. Mustapha · St. Paul, MN9 shared Michael Kallok · St. Paul, MN9 shared Steven C. Simon · St. Paul, MN9 shared Gary M. Petrucci · St. Paul, MN9 shared Jason M. Gelberd · WEST PALM BEACH, FL7 shared Christopher J. Kocourek · Minneapolis, MN7 shared Michael S. Falk · WEST PALM BEACH, FL5 shared Tim Flynn · London, United Kingdom5 shared Mark Tognolini · London, United Kingdom5 shared David Rushford · London, United Kingdom5 shared

Recent filings (34)

Hayfin Tactical Solutions Fund (US Parallel) LPMar 2026 · 5 co-filers Luminary Therapeutics, Inc.Nov 2025 · 19 co-filers$12.4M Northstar Mezzanine Partners SBIC II L.P.Jul 2025 · 11 co-filers Northstar Mezzanine Partners SBIC II L.P.Jul 2025 · 11 co-filers Hayfin Tactical Solutions Fund (Feeder) LPJun 2025 · 15 co-filers Hayfin Tactical Solutions Fund (US Parallel) LPJun 2025 · 15 co-filers Northstar Mezzanine Partners SBIC II L.P.May 2025 · 11 co-filers Northstar Mezzanine Partners SBIC II L.P.May 2025 · 11 co-filers Hayfin HOF II (US) LPMay 2025 · 15 co-filers Hayfin HOF II (TE) SCSpMay 2025 · 15 co-filers Bayforest Innovation Fund US LPFeb 2025 · 12 co-filers Hayfin Centre Street LPJan 2025 · 13 co-filers Luminary Therapeutics, Inc.Jan 2025 · 17 co-filers$5.9M Luminary Therapeutics, Inc.Jan 2025 · 17 co-filers$5.5M Cardio Flow, Inc.Jun 2024 · 17 co-filers$5.0M Northstar Mezzanine Partners SBIC II L.P.May 2024 · 8 co-filers Northstar Mezzanine Partners SBIC II L.P.May 2024 · 8 co-filers Bayforest Innovation Fund US LPJan 2024 · 13 co-filers Cardio Flow, Inc.Sep 2023 · 17 co-filers$2.0M Luminary Therapeutics, Inc.Aug 2023 · 22 co-filers$3.5M Cardio Flow, Inc.May 2023 · 17 co-filers$2.5M Bayforest Innovation Fund US LPJan 2023 · 13 co-filers Luminary Therapeutics, Inc.Jan 2023 · 24 co-filers$2.8M Cardio Flow, Inc.Sep 2021 · 17 co-filers$12.0M Cardio Flow, Inc.Apr 2021 · 17 co-filers$4.5M

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