Investor · New York, NY

Mark O?Sullivan

Open Mark in the network graph →

Filings

19

SEC Form D

Connections

33

co-filers

Capital

—

across filings

Active

May 2018

to Dec 2025

Most-connected co-filers (33)

Phil L. Brown · George Town, Grand Cayman, Cayman Islands17 shared Umberto Fedeli · Cleveland, OH9 shared James Grotelueschen · Austin, TX9 shared Andrew Robinson · Austin, TX9 shared Gary Conkright · Naperville, IL9 shared Victoria L. Parry · Dublin, Ireland9 shared Ronan W. Guilfoyle · Grand Cayman, Cayman Islands9 shared Caius Capital GP Ltd · Grand Cayman, Cayman Islands9 shared Caius Capital Limited · Grand Cayman, Cayman Islands9 shared Caius Capital LLP · London, United Kingdom9 shared Nick J. Gaze · Grand Cayman, Cayman Islands9 shared Tony M. Alexander · Dayton, OH8 shared Joseph S. Pergolizzi · Palo Alto, CA8 shared Vijayabalan E. Murugesu · Grand Cayman, Cayman Islands8 shared Christopher C. Desmarais · Sennigerberg, Luxembourg8 shared Net Return Asset Management, LLC · New York, NY8 shared Peter Lurie · New York, NY8 shared Steven R. Yanis · New York, NY8 shared Paul Conley · Santa Clara, CA2 shared Fan Yu · Hong Kong, Israel2 shared Christian N. Neira · New York, NY2 shared Michael Rees · New York, NY2 shared Sean Ward · New York, NY2 shared Jamie Lurie · New York, NY2 shared

Recent filings (19)

Caius Capital Domestic Fund LPDec 2025 · 14 co-filers NRMA Offshore Fund, Ltd.May 2025 · 8 co-filers Caius Capital Domestic Fund LPJan 2025 · 14 co-filers NRMA Offshore Fund, Ltd.May 2024 · 8 co-filers Caius Capital Domestic Fund LPApr 2024 · 14 co-filers NRMA Offshore Fund, Ltd.May 2023 · 8 co-filers Caius Capital Domestic Fund LPApr 2023 · 14 co-filers Caius Capital Domestic Fund LPMay 2022 · 14 co-filers NRMA Offshore Fund, Ltd.May 2022 · 8 co-filers NRMA Offshore Fund, Ltd.May 2021 · 8 co-filers Caius Capital Domestic Fund LPMay 2021 · 14 co-filers NRMA Offshore Fund, Ltd.May 2020 · 8 co-filers Caius Capital Domestic Fund LPMay 2020 · 14 co-filers Dyal Capital Partners IV Cardinal Aggregator (A) LPDec 2019 · 15 co-filers Dyal Capital Partners IV Cardinal Aggregator (B) LPDec 2019 · 15 co-filers NRMA Offshore Fund, Ltd.May 2019 · 8 co-filers Caius Capital Domestic Fund LPMay 2019 · 14 co-filers Caius Capital Domestic Fund LPMay 2018 · 14 co-filers NRMA Offshore Fund, Ltd.May 2018 · 8 co-filers

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