Investor · SAN FRANCISCO, CA
Mark E. Portner
Open Mark in the network graph →Filings
25
SEC Form D
Connections
71
co-filers
Capital
$250K
across filings
Active
May 2021
to Jan 2024
Most-connected co-filers (71)
Charles E. Malet · SAN FRANCISCO, CA11 sharedAdrian Percy · PALMERSTON NORTH, Q28 sharedPaul M. Parker · New York, NY8 sharedWilliam J. Kerrigan · Wellesley Hills, MA8 sharedLouis Dodd · Calumet City, IL8 sharedBrandon J. Shorenstein · SAN FRANCISCO, CA8 sharedTucker Waterman · Los Angeles, CA7 sharedMadera Technology Advisors, LLC · Dover, DE7 sharedDaniel Fishman · Redondo Beach, CA7 sharedAdam S. Henderson · Seattle, WA7 sharedJonathan Steindorff · Los Angeles, CA7 sharedSteve Glenn · Arvin, CA5 sharedAdrian Garcia · Burlingame, CA5 sharedDamian Juric · Grand Cayman, Cayman Islands5 sharedMichael R. Amend · Winnipeg, Manitoba, Canada3 sharedGordon Babcock · Toronto, Ontario, Canada3 sharedJames Boettcher · San Francisco, CA3 sharedMatthew Mcgraw · San Francisco, CA3 sharedGraham R. Bird · Winnipeg, Manitoba, Canada3 sharedRich Maloy · Louisville, CO3 sharedSiim A. Vanaselja · Winnipeg, Manitoba, Canada3 sharedRobert E. Taglich · SAN RAMON, CA3 sharedAlicia Cha · San Francisco, CA3 sharedAnthropocene Ventures GP I LLC · San Francisco, CA3 shared
Recent filings (25)
Gulch Union REIT Property, L.P.Jan 2026 · 2 co-filers$125KSterling Plaza REIT, L.P.Jan 2026 · 2 co-filers$125K901 K Street Holding, L.P.Jan 2026 · 2 co-filers$125KAnthropocene Ventures Founders Fund, LPFeb 2024 · 12 co-filersSRI Fourteen REIT LLCJan 2024 · 8 co-filers$125KSRI Fourteen REIT LLCJan 2024 · 8 co-filers$125KSHORENSTEIN REALTY INVESTORS FOURTEEN-C, L.P.Apr 2023 · 8 co-filers$1.0BSHORENSTEIN REALTY INVESTORS FOURTEEN-B, L.P.Apr 2023 · 8 co-filers$1.0BSHORENSTEIN REALTY INVESTORS FOURTEEN-A, L.P.Apr 2023 · 8 co-filers$1.0BAnthropocene Ventures Founders Fund, LPFeb 2023 · 12 co-filersSHORENSTEIN REALTY INVESTORS FOURTEEN-C, L.P.Apr 2022 · 8 co-filers$1.0BSHORENSTEIN REALTY INVESTORS FOURTEEN-A, L.P.Apr 2022 · 8 co-filers$1.0BSHORENSTEIN REALTY INVESTORS FOURTEEN-B, L.P.Apr 2022 · 8 co-filers$1.0BDistributed Global Offshore Fund II Ltd.Mar 2022 · 7 co-filersDistributed Global Fund II LPMar 2022 · 10 co-filersKey Square Partners II LPFeb 2022 · 9 co-filersKey Square Partners LPFeb 2022 · 9 co-filersAnthropocene Ventures Founders Fund, LPFeb 2022 · 12 co-filersDistributed Global Ventures T2 LPJul 2021 · 9 co-filersDistributed Global Ventures II LPJul 2021 · 9 co-filersBlu Venture Investors Cyber Fund, LPJul 2021 · 25 co-filers$25.0MBlu Venture Investors Cyber Fund, LPJun 2021 · 25 co-filers$25.0MDG SPV 5 LLCJun 2021 · 8 co-filersDG SPV 2 LLCMay 2021 · 8 co-filersDG SPV 3 LLCMay 2021 · 8 co-filers
Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Mark in the interactive graph →