Investor · San Francisco, CA

Tom Spengler

Open Tom in the network graph →

Filings

8

SEC Form D

Connections

19

co-filers

Capital

$13.9M

across filings

Active

Jun 2012

to Nov 2025

Most-connected co-filers (19)

G.F.W. Energy X, L.P · IRVING, TX3 shared Peter C. Arrowsmith · La Jolla, CA3 shared Kenneth A. Hersh · Dallas, TX3 shared Edward Roshitsh · MISSISSAUGA, Ontario, Canada3 shared Emery Jones · San Francisco, CA3 shared Wendy Beecham · San Francisco, CA3 shared Gary Read · San Francisco, CA3 shared G.F.W. Energy X, L.P · IRVING, TX3 shared Yuji Sugimoto · Tokyo, M02 shared S. W. Sarkis · BOSTON, MA2 shared Michael Siefke · BOSTON, MA2 shared Nathan Sanders · Lehi, UT2 shared Marc W. Valentiny · Grand Cayman, Cayman Islands2 shared Mark Verdi · BOSTON, MA2 shared Richard A. Natsch · San Francisco, CA1 shared Lauren Smith · New York, NY1 shared Travis Parsons · Reno, NV1 shared Erica Olsen · Reno, NV1 shared Matt Hendrickson · San Francisco, CA1 shared

Recent filings (8)

Madison Artificial Intelligence, Inc.Nov 2025 · 5 co-filers$3.5M Madison Artificial Intelligence, Inc.Nov 2025 · 5 co-filers$3.5M Ascendify CorpMay 2017 · 7 co-filers$11.3M Ascendify CorpMay 2017 · 7 co-filers$11.3M NGP Natural Resources X, L.P.Jul 2012 · 3 co-filers$4.3B GRANICUS INCJun 2012 · 6 co-filers$15K GRANICUS INCJun 2012 · 6 co-filers$15K NGP Natural Resources X, L.P.Jun 2012 · 3 co-filers$4.3B GRANICUS INCJul 2011 · 11 co-filers$65K GRANICUS INCJul 2011 · 11 co-filers$301K NGP Natural Resources X, L.P.Jun 2011 · 3 co-filers$4.8B

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