Investor · Ithaca, NY

William J. Porteous

Open William in the network graph →

Filings

15

SEC Form D

Connections

74

co-filers

Capital

$22.5M

across filings

Active

Apr 2018

to Aug 2024

Most-connected co-filers (74)

Christopher J. Steed · Ithaca, NY10 shared Julie J. Baker · Ithaca, NY10 shared Gerald Goldberg · Cobourg, Ontario, Canada10 shared Zeeshan Saeed · Cobourg, Ontario, Canada10 shared Adam J. Maher · Ithaca, NY9 shared Donal Carroll · Cobourg, Ontario, Canada8 shared David Urban · Cobourg, Ontario, Canada7 shared Stephen Buyer · Cobourg, Ontario, Canada7 shared Tom J. Edwards · Ithaca, NY7 shared Carlos D. Reyes · Elkton, VA5 shared Stephen C. Malloy · FAYETTEVILLE, AR5 shared Keith Sullivan · Toronto, Ontario, Canada5 shared Louise Lacchin · Toronto, Ontario, Canada5 shared Jeb Keiper · Burlington, MA5 shared Michael Mendelsohn · Burlington, MA5 shared Amy Schulman · Waltham, MA5 shared Anthony Durkacz · Cobourg, Ontario, Canada5 shared Carl L. Warschausky · New York, NY5 shared Thomas D. Heffernan · Mclean, VA5 shared David Marvin · Seattle, WA5 shared Jessie L. Wechsler · New York, NY5 shared Marc E. Lasry · New York, NY5 shared Andrew D. Reamer · Elkton, VA5 shared Mark Spoto · Herndon, VA5 shared

Recent filings (15)

Ursa Space Systems Inc.Aug 2024 · 17 co-filers$6.0M Ursa Space Systems Inc.Mar 2024 · 17 co-filers$6.2M Ursa Space Systems Inc.Nov 2019 · 20 co-filers$15.0M QRails, Inc.Nov 2019 · 12 co-filers$5.0M Ursa Space Systems Inc.Jul 2019 · 6 co-filers$1.5M QRails, Inc.Jun 2019 · 14 co-filers$2.5M REALPAGE INCMay 2019 · 33 co-filers$9.8M REALPAGE INCSep 2018 · 23 co-filers$5.3M QRails, Inc.Sep 2018 · 11 co-filers$7.0M REALPAGE INCJul 2018 · 23 co-filers$515K REALPAGE INCJul 2018 · 23 co-filers$20.8M Ursa Space Systems Inc.Jul 2018 · 6 co-filers$5.7M QRails, Inc.May 2018 · 17 co-filers$4.0M REALPAGE INCMay 2018 · 35 co-filers$48.0M QRails, Inc.Apr 2018 · 8 co-filers$3.0M

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