Investor · San Francisco, CA
Mark N. Williamson
Open Mark in the network graph →Filings
42
SEC Form D
Connections
101
co-filers
Capital
$281.8M
across filings
Active
Mar 2012
to Feb 2022
Most-connected co-filers (101)
Kevin R. Baker · San Francisco, CA21 sharedJames T. Farrell · San Francisco, CA12 sharedMichael D. Mchugh · Minneapolis, MN10 sharedSonen Capital Llc · San Francisco, CA10 sharedJames M. Keyes · Hamilton, Bermuda10 sharedJohn M. Douglass · Amesbury, MA10 sharedNicole Olson · New York, NY10 sharedIan A. Pilgrim · Hamilton, Bermuda10 sharedEli Roth · LOS ANGELES, CA10 sharedSonen Capital Llc · San Francisco, CA10 sharedJohn S. Markwalter, Jr · Atlanta, GA10 sharedEric Allmendinger · New York, NY10 sharedPeter A. Walter · Wellesley, MA10 sharedCalera Capital Management, Inc · San Francisco, CA10 sharedDavid R. Curry · Liberty Lake, WA10 sharedEric J. Hallberg · Doylestown, PA10 sharedCalera Capital Management, Inc · San Francisco, CA9 sharedAndrew Gasper · Montclair, NJ8 sharedGregory C. Simon · New York, NY8 sharedMartin Whittaker, Ph.D · San Francisco, CA8 sharedYola H. Ozturk · San Francisco, CA8 sharedChristopher M. Lange · New York, NY8 sharedJason Carlson · Sunnyvale, CA7 sharedMegan Rothney · Sunnyvale, CA7 shared
Recent filings (42)
Calera XXVIII, LLCJan 2026 · 4 co-filersCalera XXVII, LLCMar 2025 · 13 co-filersLearnLaunch Fund III L.P.Mar 2025 · 10 co-filers$10.0MLearnLaunch Fund III L.P.Mar 2024 · 10 co-filers$10.0MCalera Capital Image Holdings Feeder, L.P.May 2023 · 13 co-filersCalera Capital Image Holdings, L.P.May 2023 · 13 co-filersLearnLaunch Fund III L.P.Mar 2023 · 10 co-filers$10.0MTrefoil Therapeutics, Inc.Mar 2022 · 16 co-filers$12.0MLearnLaunch Fund III L.P.Mar 2022 · 10 co-filers$10.0MCalera XXIV Feeder, LLCFeb 2022 · 13 co-filersCalera XXIV, LLCFeb 2022 · 13 co-filersCalera XXIV Feeder, LLCFeb 2022 · 13 co-filersCalera XXIV, LLCFeb 2022 · 13 co-filersCalera XXIII, LLCJan 2021 · 13 co-filersCalera XXIII, LLCJan 2021 · 13 co-filersCalera XXII, LLCMar 2020 · 13 co-filersCalera XXII, LLCMar 2020 · 13 co-filersTrefoil Therapeutics, Inc.Aug 2019 · 11 co-filers$28.0MTrefoil Therapeutics, Inc.Jul 2019 · 11 co-filers$28.0MCalera XXI Feeder, LLCOct 2018 · 13 co-filersCalera XXI, LLCOct 2018 · 13 co-filersCalera XXI Feeder, LLCOct 2018 · 13 co-filersCalera XXI, LLCOct 2018 · 13 co-filersCalera XX, LLCAug 2017 · 9 co-filersSabby Healthcare Volatility Fund, LLCJun 2017 · 4 co-filers
Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Mark in the interactive graph →