Investor · Newton, MA

Corey B. Siegel

Open Corey in the network graph →

Filings

32

SEC Form D

Connections

123

co-filers

Capital

$17.2M

across filings

Active

Feb 2014

to Oct 2018

Most-connected co-filers (123)

Douglas B. Wolf · Palm Beach Gardens, FL23 shared Frank B. Peabody · Newton, MA19 shared Herbert B. Stern · Palm Beach Gardens, FL18 shared Jami S. O'Toole · Cambridge, MA8 shared Edward S. Rayner · Cambridge, MA8 shared Peter Birch · Chatham, Ontario, Canada8 shared Vinay S. Mohta · Cambridge, MA8 shared Joshua B. Korzenik · Newton, MA8 shared Romney Navarro · Austin, TX8 shared Grady Collins · Austin, TX8 shared Stephen S. Ramsthaler · New York, NY8 shared Erin S. Osborn · Cambridge, MA8 shared Katie F. Collins · Warrendale, PA7 shared Jenna F. Dziki · Warrendale, PA7 shared Stephen F. Badylak · Warrendale, PA7 shared Paul F. Fagan · Warrendale, PA7 shared Christine Sheehy · Wexford, PA7 shared George F. Hussey · Warrendale, PA7 shared Mary J. Cook · Seattle, WA6 shared John R. Kline · New York, NY6 shared Robert A. Hamwee · New York, NY6 shared Hannah Freeman · Seattle, WA6 shared New Mountain Finance Advisers BDC, L.L.C · New York, NY6 shared New Mountain Guardian II GP, L.L.C · New York, NY6 shared

Recent filings (32)

ECM Therapeutics, Inc.Oct 2025 · 20 co-filers$40.0M ECM Therapeutics, Inc.May 2024 · 20 co-filers$30.0M ECM Therapeutics, Inc.Jun 2023 · 20 co-filers$25.0M ECM Therapeutics, Inc.Sep 2022 · 20 co-filers$20.0M ECM Therapeutics, Inc.Jul 2021 · 17 co-filers$15.0M ColonaryConcepts LLCJun 2020 · 13 co-filers$285K ColonarySolutions, LLCMar 2020 · 14 co-filers$500K ColonaryConcepts LLCDec 2019 · 11 co-filers AbSci, LLCDec 2019 · 16 co-filers$15.0M ColonaryConcepts LLCNov 2019 · 11 co-filers ECM Therapeutics, Inc.Sep 2019 · 11 co-filers$10.0M ECM Therapeutics, Inc.Jun 2019 · 17 co-filers$5.0M New Mountain Guardian Partners II, L.P.Apr 2019 · 9 co-filers New Mountain Guardian Partners II Offshore, L.P.Apr 2019 · 9 co-filers Gaorong Partners Fund IV, L.P.Nov 2018 · 10 co-filers$450.0M Apollo Offshore Structured Credit Recovery Fund IV Ltd.Oct 2018 · 3 co-filers$2.5B ECM Therapeutics, Inc.Jun 2018 · 17 co-filers$5.0M AbSci, LLCJun 2018 · 17 co-filers$15.0M New Mountain Guardian Partners II, L.P.Mar 2018 · 9 co-filers New Mountain Guardian Partners II Offshore, L.P.Mar 2018 · 9 co-filers ColonarySolutions, LLCMar 2018 · 14 co-filers$6.0M Apollo Offshore Structured Credit Recovery Fund IV Ltd.Oct 2017 · 3 co-filers New Mountain Guardian Partners II, L.P.Mar 2017 · 9 co-filers Banyan Partners Fund III-A, L.P.Mar 2017 · 10 co-filers$50.0M New Mountain Guardian Partners II Offshore, L.P.Mar 2017 · 9 co-filers

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