Investor · Andover, MA

Brian Callahan

Open Brian in the network graph →

Filings

4

SEC Form D

Connections

14

co-filers

Capital

$10.4M

across filings

Active

May 2011

to Mar 2025

Most-connected co-filers (14)

Gregory Carson · Austin, TX2 shared Someera Khokhar · NEW YORK, NY2 shared Lawrence Leibowitz · San Francisco, CA2 shared Philip Press · Buck Hill Falls, PA1 shared Kirk P. Andriano · Salt Lake City, UT1 shared Michael Lewis · Boulder, CO1 shared Harry Rein · DARIEN, CT1 shared Patrick O'Donnell · Columbus, OH1 shared Patrick J. Fortune · Boston, MA1 shared Henry N. Mccarl · Gloucester, MA1 shared Dominic Redfern · CYBERCITY, EBENE, O41 shared Laurence J. Tarrant · Waltham, MA1 shared Kevin Mcardle · Newton, MA1 shared Zimu Chen · Boston, MA1 shared

Recent filings (4)

Nammu21, Inc.Mar 2025 · 7 co-filers$10.0M Nammu21, Inc.Mar 2025 · 7 co-filers$10.0M Colossal Shrimp LLCApr 2024 · 3 co-filers$500K Colossal Shrimp LLCApr 2024 · 3 co-filers$500K Nammu21, Inc.Oct 2022 · 7 co-filers$17.1M Nammu21, Inc.Oct 2022 · 7 co-filers$17.1M HISTOGENICS CORPMay 2011 · 15 co-filers HISTOGENICS CORPMay 2011 · 15 co-filers

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