Investor · San Francisco, CA

Michael J. Underdown

Open Michael in the network graph →

Filings

17

SEC Form D

Connections

83

co-filers

Capital

$90.2M

across filings

Active

Apr 2021

to Feb 2023

Most-connected co-filers (83)

David J. Daigle · San Francisco, CA11 shared Karl J. Houston · San Francisco, CA11 shared Edmond G. Leung · San Francisco, CA11 shared Khalid J. Abunaja · San Francisco, CA9 shared Kariann J. Alexander · San Francisco, CA7 shared Matthew P. Carbone · San Francisco, CA6 shared Square Wave Capital, Llc · Brooklyn, NY4 shared Square Wave Gp, Llc · Brooklyn, NY4 shared Square Wave Gp, Llc · Brooklyn, NY3 shared Square Wave Capital, Llc · Brooklyn, NY3 shared Square Wave Gp, Llc · Brooklyn, NY3 shared Steve Kandetzke · Westport, CT3 shared Godfrey Baker · Westport, CT3 shared Lakhwinder Janda · Little Switzerland, NC3 shared Kelly Rodriques · San Rafael, CA3 shared Ryan Ashayeri · Brooklyn, NY3 shared Wesley Tang-Wymer · Salem, MA3 shared Paul Yablon · New York, NY3 shared Matthew Bernardini · Westport, CT3 shared Mel Baiada · Westport, CT3 shared Michael Hudes · Westport, CT3 shared Frank Mergenthaler · Westport, CT3 shared Ihor Lys · San Francisco, CA2 shared Christopher Garvin · SEATTLE, WA2 shared

Recent filings (17)

Square Wave Partners, L.P.Feb 2026 · 2 co-filers Square Wave Partners, L.P.Feb 2025 · 7 co-filers Crosstown Fiber Holdings LLCFeb 2025 · 20 co-filers Crosstown Fiber Holdings LLCFeb 2025 · 20 co-filers Zenapse Inc.Jun 2024 · 20 co-filers$10.1M Zenapse Inc.Apr 2024 · 20 co-filers$9.4M Zenapse Inc.Feb 2024 · 20 co-filers$9.3M Square Wave Partners, L.P.Feb 2024 · 7 co-filers Crosstown Fiber Holdings LLCFeb 2024 · 19 co-filers Crosstown Fiber Holdings LLCFeb 2024 · 19 co-filers Clarify Health Holdings LLCSep 2023 · 7 co-filers Crosstown Fiber Holdings LLCFeb 2023 · 20 co-filers$33.5M Square Wave Partners, L.P.Sep 2022 · 7 co-filers Clarify Health Holdings LLCSep 2022 · 7 co-filers Crosstown Fiber Holdings LLCAug 2022 · 20 co-filers$109.4M ThreatQuotient, Inc.Sep 2021 · 23 co-filers$14.1M EcoSense Lighting Inc.Apr 2021 · 20 co-filers$39.1M EcoSense Lighting Inc.Apr 2021 · 20 co-filers$35.0M ThreatQuotient, Inc.Apr 2021 · 23 co-filers$12.6M

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