Investor · Itasca, IL

Jack Blumenstein

Open Jack in the network graph →

Filings

23

SEC Form D

Connections

68

co-filers

Capital

—

across filings

Active

Feb 2009

to Mar 2026

Most-connected co-filers (68)

Oakleigh Thorne · Millbrook, NY23 shared Marguerite Elias · Itasca, IL17 shared Robert Crandall · Itasca, IL17 shared Donald Wagner · New York, NY16 shared Reid W. Simpson · Traverse City, MI13 shared Ron Lemay · New York, NY10 shared Lawrence Lavine · New York, NY10 shared Christopher Minnetian · New York, NY10 shared Brian Murphy · FORT COLLINS, CO9 shared Jon L. Glass · Dallas, TX9 shared Gregory D. Waller · Davis, CA9 shared Gary E. Graham · Centennial, CO9 shared Ronald A. Andrews · Aliso Viejo, CA9 shared Bryan H. Lawrence · New York, NY9 shared Wayne B. Stoltenberg · Dallas, TX9 shared Dennis M. Smith · St. Augustine, FL9 shared W. H. Keenan · New York, NY9 shared Steve Struna · Denver, CO7 shared Brian Cogley · Cranberry Twp, PA5 shared David Mehalick · Wexford, PA5 shared Anders Eisner · Irvine, CA5 shared Robert L. Lewis · Madison, MS5 shared Martin Lewis · Plainview, TX5 shared Bruce Cassidy · Sarasota, FL5 shared

Recent filings (23)

Nok Therapeutics, Inc.Mar 2026 · 5 co-filers$1K Jabez Biosciences, Inc.Mar 2026 · 6 co-filers Jabez Biosciences, Inc.Oct 2025 · 20 co-filers Nok Therapeutics, Inc.Oct 2025 · 17 co-filers$750K Nok Therapeutics, Inc.Oct 2025 · 17 co-filers Jabez Biosciences, Inc.Oct 2025 · 20 co-filers$3.0M Jabez Biosciences, Inc.Oct 2025 · 20 co-filers MachineryLink IncDec 2011 · 11 co-filers$15.0M ZAVE NETWORKS INCAug 2011 · 15 co-filers$10.6M MachineryLink IncMar 2011 · 15 co-filers$22.8M MachineryLink IncFeb 2011 · 15 co-filers$18.3M TRULITE INCNov 2010 · 15 co-filers$100K TRULITE INCNov 2010 · 15 co-filers$75K Aircell Holdings Inc.Jul 2010 · 10 co-filers$65.1M Aircell Holdings Inc.Mar 2010 · 18 co-filers$40.1M Aircell Holdings Inc.Jan 2010 · 17 co-filers$36.6M Aircell Holdings Inc.Jan 2010 · 17 co-filers AC HOLDCO LLCDec 2009 · 17 co-filers$115.0M AC HOLDCO LLCNov 2009 · 17 co-filers$75.0M AC HOLDCO LLCSep 2009 · 17 co-filers$35.0M AC HOLDCO LLCSep 2009 · 17 co-filers$15.0M AC HOLDCO LLCApr 2009 · 17 co-filers$122.8M AC HOLDCO LLCFeb 2009 · 17 co-filers$60.0M

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