Investor · Chicago, IL

Mark H. Longenecker

Open Mark in the network graph →

Filings

23

SEC Form D

Connections

169

co-filers

Capital

$12.1M

across filings

Active

Dec 2022

to Jul 2025

Most-connected co-filers (169)

Christopher Golda · San Francisco, CA9 shared Nemanja Kostic · San Francisco, CA5 shared Alex Kassan · Los Angeles, CA4 shared Bruno Duguay · BROSSARD, Quebec, Canada4 shared Stephane N. Blanchet · BROSSARD, Quebec, Canada4 shared Leonard G. Polizzotto · MARLBOROUGH, MA4 shared Brad Paterson · Calgary, Alberta, Canada3 shared Ryan Agresta · Edmonds, WA3 shared Chris Bakker · Calgary, Alberta, Canada3 shared Stephen Doyle · Fremont, CA3 shared Alex B. Wahlloef Malinconico · New York, NY3 shared Radin Ahmadian · New York, NY3 shared Sandeep Kini · Edmonds, WA3 shared Michael Leo · Calgary, Alberta, Canada3 shared Peter Lawrence · Burlington, MA3 shared Jeb Keiper · Burlington, MA3 shared Jonathan Berent · Mountain View, CA3 shared Natare Capital Management LP · New York, NY3 shared Nico Y. Mizrahi · Los Angeles, CA3 shared Nicholas Downing · Burlington, MA3 shared Michael Mendelsohn · Burlington, MA3 shared Paul Kirincich · Fremont, CA3 shared Richard Elmhirst · New York, NY3 shared Josh Schnurmann · New York, NY3 shared

Recent filings (23)

GM Seed SPV, a series of Tonic-Barrel, LPAug 2025 · 4 co-filers$76K GM Seed SPV, a series of Tonic-Barrel, LPAug 2025 · 4 co-filers$76K TRF LLCJul 2025 · 8 co-filers Tonic Ventures Fund I, LPJul 2025 · 4 co-filers$10.0M Tonic Ventures Fund I, LPJul 2025 · 4 co-filers$10.0M Perfectly Dosed Fund I, a Series of Tonic-Barrel, LPMay 2025 · 4 co-filers$283K Perfectly Dosed Fund I, a Series of Tonic-Barrel, LPMay 2025 · 4 co-filers$283K OL-1113 Fund I, a series of Tonic-Barrel, LPMar 2025 · 4 co-filers$607K OL-1113 Fund I, a series of Tonic-Barrel, LPMar 2025 · 4 co-filers$607K Pattern Ventures Fund I LPMar 2025 · 10 co-filers$100.0M KMO 1 LPMar 2025 · 10 co-filers Cardurion Pharmaceuticals, Inc.Jul 2024 · 22 co-filers$260.4M TRF LLCJul 2024 · 8 co-filers CIP IX Co-Investment Vehicle 1 - E L.P.May 2024 · 13 co-filers Coller International Partners IX - F, L.P.May 2024 · 11 co-filers Coller International Partners IX - E, L.P.May 2024 · 11 co-filers Tonic Ventures Fund I, LPApr 2024 · 4 co-filers$10.0M Tonic Ventures Fund I, LPApr 2024 · 4 co-filers$10.0M Tonic Ventures Fund I, LPApr 2024 · 4 co-filers$10.0M Tonic Ventures Fund I, LPApr 2024 · 4 co-filers$10.0M Pattern Ventures Fund I LPMar 2024 · 10 co-filers$100.0M HUBBELL REALTY CoMar 2024 · 88 co-filers$10.0M GreyscaleAI, Inc.Oct 2023 · 8 co-filers$500K GreyscaleAI, Inc.Sep 2023 · 8 co-filers$5.0M Cardurion Pharmaceuticals, Inc.Jul 2023 · 20 co-filers$128.1M

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