Investor · Chicago, IL

Matt Hallgren

Open Matt in the network graph →

Filings

2

SEC Form D

Connections

13

co-filers

Capital

$7.8M

across filings

Active

Jun 2024

to Nov 2025

Most-connected co-filers (13)

Todd Johnson · Bend, OR2 shared Lee Miller · Philadelphia, PA1 shared Patricia Morehead · Chicago, IL1 shared S1 Seed Fund Management LLC · Chicago, IL1 shared Abundant Venture Partners Holding, LLC · Chicago, IL1 shared S1 Seed Ventures I GP, LLC · Chicago, IL1 shared Harry Kirschner · Chicago, IL1 shared Arif Sorathia · Alexandria, VA1 shared Leo Brubaker · Chicago, IL1 shared William Sheahan · Brentwood, TN1 shared S1 Seed Fund Management LLC · Chicago, IL1 shared Inna Plumb · New York, NY1 shared S1 Seed Ventures I GP, LLC · Chicago, IL1 shared

Recent filings (2)

Auxira Health, Inc.Nov 2025 · 11 co-filers$7.8M Auxira Health, Inc.Nov 2025 · 11 co-filers$7.8M S1 Seed Ventures I, LPJun 2024 · 15 co-filers$30.0M S1 Seed Ventures I, LPJun 2024 · 15 co-filers$30.0M

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