Investor · Columbus, OH

Michael D. O'Brien

Open Michael in the network graph →

Filings

8

SEC Form D

Connections

61

co-filers

Capital

$137.1M

across filings

Active

Feb 2019

to Feb 2026

Most-connected co-filers (61)

Daniel D. Phlegar · Columbus, OH3 shared Frank J. Capella · Columbus, OH3 shared Elizabeth C. Williams · AUSTIN, TX3 shared Patricia F. Kemp · GREENWICH, CT3 shared Jeffrey Vinik · Tampa, FL2 shared Vinik Asset Management LP · Tampa, FL2 shared JNV Partners LLC · Tampa, FL2 shared Martin Walker · Mercer Island, WA2 shared Mark N. Hostetter · Tampa, FL2 shared Jan Drake · Mercer Island, WA2 shared Joseph N. Bou-Saba · SAN FRANCISCO, CA2 shared Jayaveera N. Kodali · SAN FRANCISCO, CA2 shared Stephen L. Lewis · Southington, CT2 shared Swapnil Agarwal · Houston, TX2 shared Bettina Paek · Mercer Island, WA2 shared Matthew N. Ziskie · MONROVIA, CA2 shared Gerard N. Coughlin · Tampa, FL2 shared Oxer Capital, Inc · Columbus, OH2 shared Kristopher D. Walters · Los Angeles, CA2 shared Clark K. Wen · Los Angeles, CA2 shared Connor Nail · Scottsdale, AZ2 shared Gene Cohen · Scottsdale, AZ2 shared Oxer GP Iii, LLC · Columbus, OH2 shared Buzz W. Benson · Maple Grove, MN1 shared

Recent filings (8)

SWNB BANCORP INCFeb 2026 · 16 co-filers$30.0M Oxer Mezzanine Fund III, L.P.Mar 2024 · 12 co-filers Oxer Mezzanine Fund III, L.P.Mar 2023 · 12 co-filers Integrated Laboratory Systems Holdings, LLCJun 2020 · 8 co-filers$2.7M Oxer Mezzanine Fund II, L.P.Sep 2019 · 6 co-filers SWNB BANCORP INCFeb 2019 · 32 co-filers$20.0M Vinik Fund II LPFeb 2019 · 12 co-filers Vinik Partners II LPFeb 2019 · 12 co-filers

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