Investor · Madison, WI

Matthew S. Sitkowski

Open Matthew in the network graph →

Filings

12

SEC Form D

Connections

69

co-filers

Capital

$20.0M

across filings

Active

Apr 2019

to Dec 2025

Most-connected co-filers (69)

Bradlee Stamper · Madison, WI12 shared Travis J. Holt · Loyal, WI9 shared Steven D. Dehnert · Fort Atkinson, WI9 shared James D. Kennedy, Jr · Dubuque, IA9 shared Timothy G. Purman · Hartford, WI7 shared Brian M. Dorrah · Tempe, AZ6 shared Don M. Cape · Las Vegas, NV6 shared Vincent M. Vasquez · Tucson, AZ6 shared Eric Kotch · Pearl River, NY6 shared Trent D. Davis · CHENGDU, Israel6 shared Jennifer Zeszut · Santa Cruz, CA6 shared Paul Earle · Santa Cruz, CA6 shared Graham Anderson · Bedford, NY6 shared Stuart Strumwasser · Bedford, NY6 shared Samuel Kotch · Pearl River, NY6 shared Mike G. Tenpas · Grafton, WI6 shared Zhu Guangyan · Avon, CT6 shared Thomas P. Olson · Madison, WI6 shared Kris L. Ausborn · Emmetsburg, IA6 shared Marvin S. Veatch · Seymour, IN6 shared Paul L. Hoffmann · Monona, WI6 shared Xi Wen · CHENGDU, Israel6 shared Benjamin Kotch · Pearl River, NY6 shared Carson M. Brown · Tempe, AZ6 shared

Recent filings (12)

Bankers' Bancorporation, Inc.Dec 2025 · 38 co-filers Bankers' Bancorporation, Inc.May 2025 · 38 co-filers Bankers' Bancorporation, Inc.May 2024 · 38 co-filers Bankers' Bancorporation, Inc.Jun 2021 · 35 co-filers EMERGE DIAGNOSTICS, INCMar 2021 · 23 co-filers$500K Bankers' Bancorporation, Inc.Dec 2020 · 35 co-filers Bankers' Bancorporation, Inc.Dec 2020 · 35 co-filers$20.0M EMERGE DIAGNOSTICS, INCOct 2020 · 23 co-filers$550K Genesis Software Innovations, LLCJun 2020 · 8 co-filers$427K EMERGE DIAGNOSTICS, INCDec 2019 · 22 co-filers$500K Genesis Software Innovations, LLCDec 2019 · 8 co-filers$1.3M Genesis Software Innovations, LLCApr 2019 · 8 co-filers$2.0M

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