Ledger.
Investor · Salt Lake City, UT

Porter B. Openshaw

Open Porter in the network graph →
Filings
11
SEC Form D
Connections
46
co-filers
Capital
$27.8M
across filings
Active
Apr 2023
to Nov 2025

Most-connected co-filers (46)

Arthur Yakubovsky · George Town, Grand Cayman, Cayman Islands7 sharedGregg Stewart · LAS VEGAS, NV4 sharedChristian Stephen · LAS VEGAS, NV4 sharedJustin Macneil · Hamilton, Bermuda2 sharedAlberto Autmezguine · Hamilton, Bermuda2 sharedCatherine Valeri · Hamilton, Bermuda2 sharedJack Krupey · DOVER, DE2 sharedMark Lemmons · Littleton, CO2 sharedBradley Lundy · Los Angeles, CA2 sharedJames D. Lewis · George Town, Grand Cayman, Cayman Islands2 sharedAriel Trybuch · LOS ANGELES, CA2 sharedEdward Lee · Vancouver, British Columbia, Canada2 sharedRon S. Hunt · San Carlos, CA2 sharedSpencer Hess · Draper, UT2 sharedShane B. Peery · Draper, UT2 sharedJay Zaveri · CAMPBELL, CA2 sharedJonathan Drachman · South San Francisco, CA2 sharedJoseph Bailes · South San Francisco, CA2 sharedAndrew Robbins · South San Francisco, CA2 sharedMark Chin · South San Francisco, CA2 sharedLuke N. Walker · South San Francisco, CA2 sharedJulie Eastland · South San Francisco, CA2 sharedScott Myers · South San Francisco, CA2 sharedLauren P. Silvernail · South San Francisco, CA2 shared

Recent filings (11)

Testament Inc.Mar 2026 · 2 co-filers$155KAvenue at Harbison NR, LLCNov 2025 · 13 co-filers$15.1MAvenue at Harbison NR, LLCNov 2025 · 13 co-filers$15.1MAvenue at Harbison NR, LLCOct 2025 · 13 co-filers$15.1MAvenue at Harbison NR, LLCOct 2025 · 13 co-filers$15.1MTestament Inc.Aug 2025 · 5 co-filers$53KTestament Inc.Aug 2025 · 5 co-filers$10KTestament Inc.Aug 2025 · 5 co-filers$10KTestament Inc.Aug 2025 · 5 co-filers$53KButler Hall Capital LPJul 2025 · 5 co-filersHarpoon Therapeutics, Inc.Oct 2023 · 26 co-filers$100.2MButler Hall Capital LPApr 2023 · 5 co-filersHarpoon Therapeutics, Inc.Apr 2023 · 30 co-filers$25.0M

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