Investor · New York, NY

William D. Porteous

Open William in the network graph →

Filings

61

SEC Form D

Connections

242

co-filers

Capital

$662.9M

across filings

Active

Sep 2009

to Dec 2022

Most-connected co-filers (242)

James D. Robinson, Iv · New York, NY13 shared Stuart J. Ellman · New York, NY13 shared Armando O. Roche · Tampa, FL10 shared Jonathan A. Levy · Tampa, FL10 shared Eric N. Hippeau · New York, NY10 shared Edmund M. O'Carroll · Tampa, FL10 shared George A. Guida · Tampa, FL10 shared R. B. Smith Iii, Ph.D · Lutz, FL10 shared Scott English · New York, NY9 shared Gabriel Kompkoff · Seattle, WA8 shared Matt O'Connell · Seattle, WA8 shared Everardo W. Goyanes · New York, NY8 shared James D. Robinson, Iii · New York, NY8 shared Raju Rishi · New York, NY8 shared Jonah Peretti · New York, NY7 shared Ajay Royan · San Francisco, CA7 shared Kenneth N. Lerer · New York, NY7 shared John Johnson Iii · New York, NY6 shared Jason Andrews · Tukwila, WA6 shared Patrick Kerins · New York, NY6 shared Marian Joh · Denver, CO6 shared Mark Frackt · New York, NY6 shared Christopher C. Bowring · Grand Cayman, Cayman Islands5 shared Indra Hornsby · Tukwila, WA5 shared

Recent filings (61)

Lovelace AI Inc.Jun 2025 · 5 co-filers$17.5M Lovelace AI Inc.Jun 2025 · 5 co-filers$17.5M Spire Global, Inc.Mar 2025 · 17 co-filers$40.0M Spire Global, Inc.Mar 2025 · 17 co-filers$40.0M RRE Ventures VIII, L.P.Dec 2022 · 12 co-filers$250.0M RRE Binance SPV, L.P.Dec 2021 · 12 co-filers Spire Global, Inc.Aug 2021 · 17 co-filers$245.0M Spire Global, Inc.Aug 2021 · 17 co-filers$245.0M RRE Ventures VIII, L.P.May 2021 · 12 co-filers UdiSense Inc.Feb 2021 · 17 co-filers$25.0M UdiSense Inc.Feb 2021 · 17 co-filers$25.0M Spaceflight Industries, Inc.Nov 2019 · 15 co-filers$39.9M Spaceflight Industries, Inc.Nov 2019 · 15 co-filers$39.9M RRE Leaders II, L.P.Feb 2019 · 12 co-filers$150.0M Spaceflight Industries, Inc.Dec 2018 · 19 co-filers$29.9M Spaceflight Industries, Inc.Nov 2018 · 17 co-filers$29.9M Spaceflight Industries, Inc.Mar 2018 · 20 co-filers$210.7M RRE Leaders II, L.P.Feb 2018 · 12 co-filers$150.0M RRE Ventures VII, L.P.Feb 2018 · 12 co-filers$250.0M Spaceflight Industries, Inc.Nov 2017 · 24 co-filers$150.7M ClearBlade, Inc.Aug 2017 · 8 co-filers$3.0M Yipit, Inc.Jun 2017 · 9 co-filers$9.8M Yipit, Inc.Jun 2017 · 9 co-filers$9.8M Monteris Medical US, Inc.Jun 2017 · 14 co-filers$26.6M RRE Leaders II, L.P.Feb 2017 · 12 co-filers$150.0M

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