Investor · Pittsburgh, PA

Thomas G. Campbell

Open Thomas in the network graph →

Filings

21

SEC Form D

Connections

77

co-filers

Capital

$30.4M

across filings

Active

Apr 2021

to Mar 2026

Most-connected co-filers (77)

Samuel L. Gulko · Pittsburgh, PA17 shared Steven L. Elfman · Pittsburgh, PA17 shared Andrew W. Arno · Pittsburgh, PA17 shared Gregory J. Szabo · Pittsburgh, PA15 shared Timothy C. Huffmyer · Pittsburgh, PA12 shared Chetan L. Sharma · Pittsburgh, PA9 shared Asha L. Keddy · Pittsburgh, PA9 shared William W. Smith Jr · Pittsburgh, PA8 shared William W. Smith, Jr · Aliso Viejo, CA8 shared Timothy Wall · Burlington, VT6 shared Thomas A. Haught · Akron, OH5 shared James M. Kempton · Pittsburgh, PA5 shared Matanya Horowitz · Louisville, CO4 shared Vikas Lunia · Dallas, TX4 shared Michael R. Graige · Boulder, CO4 shared Jonathan Nobil · Bethesda, MD4 shared Francisco T. Alvarez-Demalde · Menlo Park, CA4 shared Robert Kreamer · Louisville, CO4 shared Andrew M. Sheiner · Chicago, IL4 shared Paul J. Nicoletti · Toronto, Ontario, Canada4 shared Christopher E. Varelas · Menlo Park, CA4 shared Karl T. O'Reilly · George Town, Grand Cayman, Cayman Islands4 shared Christopher Mcelhone · Toronto, Ontario, Canada4 shared Thomas J. Smach · Menlo Park, CA4 shared

Recent filings (21)

SMITH MICRO SOFTWARE, INC.Mar 2026 · 8 co-filers$4.9M SMITH MICRO SOFTWARE, INC.Nov 2025 · 10 co-filers$1.5M SMITH MICRO SOFTWARE, INC.Nov 2025 · 10 co-filers SMITH MICRO SOFTWARE, INC.Sep 2025 · 10 co-filers$1.4M SMITH MICRO SOFTWARE, INC.Aug 2025 · 10 co-filers SMITH MICRO SOFTWARE, INC.Oct 2024 · 9 co-filers$3.0M SMITH MICRO SOFTWARE, INC.Oct 2024 · 9 co-filers SMITH MICRO SOFTWARE, INC.May 2024 · 8 co-filers SMITH MICRO SOFTWARE, INC.Aug 2022 · 10 co-filers$15.0M SMITH MICRO SOFTWARE, INC.Apr 2021 · 9 co-filers$10.0M SMITH MICRO SOFTWARE, INCJan 2019 · 20 co-filers$5.8M SMITH MICRO SOFTWARE, INCNov 2018 · 20 co-filers$7.5M Arcus Zensen FundOct 2018 · 16 co-filers SMITH MICRO SOFTWARE INCMay 2018 · 20 co-filers$7.0M SMITH MICRO SOFTWARE INCMar 2018 · 20 co-filers$5.0M Payroc LLCFeb 2018 · 25 co-filers$3.4M Michael Baker International, LLCDec 2017 · 25 co-filers$22.5M SMITH MICRO SOFTWARE INCNov 2017 · 13 co-filers$5.5M SMITH MICRO SOFTWARE INCNov 2017 · 13 co-filers$5.5M Arcus Zensen FundOct 2017 · 16 co-filers Payroc LLCOct 2016 · 21 co-filers$10.9M Arcus Zensen FundOct 2016 · 16 co-filers

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