Investor · Cambridge, MA

Mark Jacobstein

Open Mark in the network graph →

Filings

9

SEC Form D

Connections

55

co-filers

Capital

$15.2M

across filings

Active

Aug 2017

to Oct 2022

Most-connected co-filers (55)

Scott A. Xiao · BURNABY, British Columbia, Canada8 shared Benton Cummings · New York, NY5 shared Dean A. Travers · ASPEN, CO5 shared Anthony Pacione · Venice, FL5 shared Henrik Falktoft · New York, NY5 shared Charles Davis · New York, NY5 shared Jeffrey Dunn · Cambridge, MA4 shared Adam C. Lloyd · Atlanta, GA3 shared James Buskard · Vancouver, British Columbia, Canada3 shared Robert Langer · PITTSBURGH, PA3 shared Benjamin E. Leboe · Vancouver, British Columbia, Canada3 shared Dennis Higgs · Vancouver, British Columbia, Canada3 shared Christina Blacker · Vancouver, British Columbia, Canada3 shared Ralph C. Teal, Jr · Myrtle Beach, SC3 shared Brien P. Smith · Dallas, TX2 shared Joana R. Scaff · London, United Kingdom2 shared John P. Buser · Dallas, TX2 shared Jonathan D. Shofet · New York, NY2 shared Benjamin Shotzberger · Thornton, CO2 shared Heath Sharbono · Thornton, CO2 shared Joel Paine · Thornton, CO2 shared Michael Sheredy · Thornton, CO2 shared David Peterson · Thornton, CO2 shared Blake D. Rice · New York, NY2 shared

Recent filings (9)

Sleuth Insights, Inc.Oct 2025 · 5 co-filers$7.9M Sleuth Insights, Inc.Oct 2025 · 5 co-filers$7.9M LUMINOPIA, INC.Jun 2023 · 11 co-filers$16.8M LUMINOPIA, INC.Jun 2023 · 11 co-filers$16.8M LUMINOPIA, INC.Oct 2022 · 18 co-filers$5.1M LUMINOPIA, INC.Dec 2019 · 16 co-filers$13.6M Datarista, Inc.May 2018 · 17 co-filers$1.0M Security Structures, Inc.May 2018 · 26 co-filers$62.5M Security Structures, Inc.Apr 2018 · 26 co-filers$125.0M Datarista, Inc.Sep 2017 · 11 co-filers$1.0M Datarista, Inc.Aug 2017 · 11 co-filers$1.0M

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