Investor · Santa Monica, CA

Anton Zietsman

Open Anton in the network graph →

Filings

19

SEC Form D

Connections

55

co-filers

Capital

$1.1B

across filings

Active

May 2021

to Jan 2026

Most-connected co-filers (55)

Robert C. Pfleging · San Ramon, CA9 shared Mountaineer Partners Management, LLC · New York, NY9 shared Patrick Horsman · San JUan, Puerto Rico6 shared Travis Kell · Santa Monica, CA6 shared Elaine Moore · San Francisco, CA5 shared Mountaineer Partners GP, LLC · New York, NY5 shared Donald G. Rowden · Pleasanton, CA5 shared Inderjit M. Singh · Grand Cayman, Cayman Islands5 shared Thomas K. Parsons, Jr · Grand Cayman, Cayman Islands4 shared Jeffery C. Schneider · Moorestown, NJ4 shared Mark Lee · New York, NY4 shared Maryanna Saenko · Los Altos Hills, CA4 shared James G. Peyer · New York, NY4 shared Robert S. Newell · Las Vegas, NV4 shared Kelly Ventures I GP, LLC · Atherton, CA4 shared Christian Angermayer · Mosta, O13 shared Max Kozower · NEW YORK, NY3 shared Matthew Gaylord · Waltham, MA3 shared Adam Dunsby · NEW YORK, NY3 shared Aron Shapiro · Waltham, MA3 shared Joshua Carter · Salt Lake City, UT3 shared Stephan Ilnyckyj · Brooklyn, NY3 shared Rob Bakshi · Vancouver, British Columbia, Canada2 shared Anjan Mukherjee · Boston, MA2 shared

Recent filings (19)

Mountaineer Partners, LPJan 2026 · 1 co-filer Mountaineer Offshore Fund, Ltd.Jan 2026 · 3 co-filers Mountaineer Partners, LPJan 2025 · 5 co-filers Mountaineer Offshore Fund, Ltd.Jan 2025 · 10 co-filers Cambrian BioPharma IncJan 2025 · 14 co-filers$37.6M Metropolis Technologies, Inc.Jun 2024 · 15 co-filers$1.0B Mountaineer Offshore Fund, Ltd.Jan 2024 · 11 co-filers Mountaineer Partners, LPJan 2024 · 5 co-filers Cambrian BioPharma IncDec 2023 · 14 co-filers$40.0M Mountaineer Partners, LPJan 2023 · 5 co-filers Mountaineer Offshore Fund, Ltd.Jan 2023 · 11 co-filers Metropolis Technologies, Inc.Sep 2022 · 13 co-filers$107.5M Hone Group Inc.Aug 2022 · 13 co-filers$30.0M Hone Group Inc.Aug 2022 · 13 co-filers$30.0M Mountaineer Partners, LPMay 2022 · 5 co-filers Mountaineer Offshore Fund, Ltd.Jan 2022 · 11 co-filers Cambrian BioPharma IncDec 2021 · 8 co-filers$100.8M Mountaineer Partners, LPMay 2021 · 5 co-filers TerraTrue Inc.May 2021 · 5 co-filers$15.0M TerraTrue Inc.May 2021 · 5 co-filers$15.0M Cambrian BioPharma IncMay 2021 · 7 co-filers$28.4M

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