Investor · Boston, MA

Brigid O'Brien

Open Brigid in the network graph →

Filings

18

SEC Form D

Connections

33

co-filers

Capital

$349.1M

across filings

Active

Feb 2022

to Jul 2025

Most-connected co-filers (33)

Kyle Teamey · Markle, IN13 shared Adam Stein · LOS ANGELES, CA8 shared Navroz Rahemtulla · LOS ANGELES, CA8 shared Ra Capital Planetary Health Fund Gp, Llc · Boston, MA8 shared Charles M. Mcmillan · Rio Rancho, NM8 shared Ra Capital Planetary Health Fund Gp, Llc · Boston, MA8 shared Ra Capital Planetary Health Fund Gp, Llc · Boston, MA8 shared Tyler Bloechinger · Winter Park, FL8 shared Gregory Meerbaum · Winter Park, FL8 shared Peter M. Kolchinsky · Boston, MA8 shared Rajeev M. Shah · Boston, MA8 shared Nancy Cocozza · Arlington, VA8 shared J.P. Morgan Alternative Asset Management, Inc · New York, NY5 shared J.P. Morgan Alternative Asset Management, Inc · New York, NY5 shared J.P. Morgan Alternative Asset Management, Inc · New York, NY5 shared Richard Ruffer · New York, NY5 shared Robert J. Meschi · George Town, Cayman Islands3 shared Denise Barnes · PORTLAND, OR3 shared Josh Kattenberg · Sioux Falls, SD3 shared Daniel Cohen · Pittsburgh, PA2 shared Christine A. Fletcher · Grand Cayman, Cayman Islands2 shared Nathan Frank · Sacramento, CA2 shared Ilan Frank · Sacramento, CA2 shared Philip Van Wormer · Memphis, TN2 shared

Recent filings (18)

RA Capital Planetary Health International Fund, L.P.Jul 2025 · 14 co-filers RA Capital Planetary Health Fund, L.P.Jul 2025 · 14 co-filers RA Capital Planetary Health International Fund, L.P.Jul 2025 · 14 co-filers RA Capital Planetary Health Fund, L.P.Jul 2025 · 14 co-filers RA Capital Planetary Health International Fund, L.P.Feb 2025 · 14 co-filers RA Capital Planetary Health Fund, L.P.Feb 2025 · 14 co-filers RA Capital Planetary Health International Fund, L.P.Feb 2025 · 14 co-filers RA Capital Planetary Health Fund, L.P.Feb 2025 · 14 co-filers 475 Fund, Ltd.Sep 2024 · 8 co-filers Emerging Opportunities Fund SPC, LtdSep 2024 · 8 co-filers Citadel 2, LLCMar 2024 · 8 co-filers$12.2M RA Capital Planetary Health International Fund, L.P.Feb 2024 · 14 co-filers RA Capital Planetary Health Fund, L.P.Feb 2024 · 14 co-filers RA Capital Planetary Health International Fund, L.P.Feb 2024 · 14 co-filers RA Capital Planetary Health Fund, L.P.Feb 2024 · 14 co-filers Citadel I, LLCNov 2023 · 8 co-filers$1.2M Select Credit Opportunities Offshore Fund II, L.P.Sep 2023 · 8 co-filers RA Capital Planetary Health International Fund, L.P.Sep 2023 · 14 co-filers RA Capital Planetary Health Fund, L.P.Sep 2023 · 14 co-filers RA Capital Planetary Health International Fund, L.P.Sep 2023 · 14 co-filers RA Capital Planetary Health Fund, L.P.Sep 2023 · 14 co-filers 475 Fund, Ltd.Sep 2023 · 8 co-filers Emerging Opportunities Fund SPC, LtdSep 2023 · 8 co-filers RH Norcal GP, LLCAug 2022 · 9 co-filers$100 Citadel I, LLCFeb 2022 · 2 co-filers$1.1M

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