Investor · Toronto, Ontario, Canada

Jack F. Altshuler

Open Jack in the network graph →

Filings

7

SEC Form D

Connections

78

co-filers

Capital

$1.7M

across filings

Active

Mar 2021

to Dec 2025

Most-connected co-filers (78)

Brian P. Burke · Toronto, Ontario, Canada7 shared James F. Mongiardo · Toronto, Ontario, Canada7 shared Amber W. Ramsey · GREENWICH, CT4 shared Joseph James · Colleyville, TX4 shared Tony Antony · Colleyville, TX4 shared Iva Mishra · Colleyville, TX4 shared Eric Corum · Austin, TX3 shared John E. Kowaleski · Boston, MA3 shared Morgan Flager · Austin, TX3 shared John C. Banks · Marown, Y83 shared Danny Lynch · Austin, TX3 shared Dwight R. Keysor · Charlottesville, VA3 shared Edward Bereznicki · Vancouver, British Columbia, Canada2 shared Calvin R. Watson · Vancouver, British Columbia, Canada2 shared Max Bennett · New York, NY2 shared Shaun R. Wyzykoski · Vancouver, British Columbia, Canada2 shared Rod Owen · El Segundo, CA2 shared David R. Safton · Vancouver, British Columbia, Canada2 shared Jeff Dare · Vancouver, British Columbia, Canada2 shared Joel Allison · El Segundo, CA2 shared Robert Sheehy · El Segundo, CA2 shared Todd R. Holmstrom · Vancouver, British Columbia, Canada2 shared Jeffrey Immelt · El Segundo, CA2 shared William Brody · El Segundo, CA2 shared

Recent filings (7)

A-SYNAPTIC CORP.Dec 2025 · 19 co-filers$2.0M GEFION CANADA INC.Aug 2024 · 17 co-filers$300K First Helium Inc.Mar 2022 · 20 co-filers$1.6M GEFION CANADA INC.Mar 2022 · 8 co-filers$875K First Helium Inc.Mar 2021 · 22 co-filers$1.6M Radiology Partners Holdings, LLCMar 2021 · 50 co-filers$12.6M Radiology Partners Holdings, LLCMar 2021 · 50 co-filers$26.4M

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