Investor · Boston, MA
Isaac A. Klein, M.D., Ph.D
Open Isaac in the network graph →Filings
35
SEC Form D
Connections
98
co-filers
Capital
$209.1M
across filings
Active
Mar 2021
to Mar 2026
Most-connected co-filers (98)
Alaina A. Danley · Camana Bay, Cayman Islands28 sharedAltair Investment Management Ltd · Hamilton, Bermuda28 sharedVlad Kotlyarsky · New York, NY14 sharedRichbrook Advisors, Lp · New York, NY14 sharedRichbrook Advisors, Lp · New York, NY14 sharedAndrew Ball · New York, NY14 sharedRichbrook Advisors, Lp · New York, NY14 sharedStewart W. Appelrouth · Philadelphia, PA12 sharedJordan Licht · New York, NY12 sharedChris L. Darragh · Chicago, IL12 sharedJonathan Wenrich · Seattle, WA12 sharedJonathan F. Green · Burlington, MA9 sharedJonathan Bain · Grand Cayman, Cayman Islands9 sharedChristine Hruska · Portland, OR9 sharedRichard A. Young, Ph.D · Boston, MA7 sharedMelissa Bailey · New Albany, IN6 sharedTitan Advisors, Llc · Stamford, CT6 sharedGeorge J. Fox · Stamford, CT6 sharedAristides Capital Llc · Lexington, KY6 sharedJay J. Mcclain · Austin, TX5 sharedAristides Capital Llc · Ottawa Hills, OH5 sharedLaura P. Mcgrath · Manakin-Sabot, VA5 sharedGenesis J. Guanga · GRAND RAPIDS, MI5 sharedJonathan Bain · GRAND CAYMAN, Cayman Islands5 shared
Recent filings (35)
Aristides Fund Cayman Ltd.Mar 2026 · 3 co-filersTITAN MASTERS INTERNATIONAL FUND LTDMar 2026 · 4 co-filersGRANVILLE MULTI-STRATEGY GLOBAL PARTNERS, LTD.Jan 2026 · 2 co-filersAristides Fund Cayman Ltd.Nov 2025 · 10 co-filersDewpoint Therapeutics, Inc.Sep 2025 · 34 co-filers$59.1MRichBrook Offshore Segregated Portfolio A - Agency MBSAug 2025 · 14 co-filersRichBrook Offshore Segregated Portfolio D - Agency MBSAug 2025 · 14 co-filersRichBrook Offshore Segregated Portfolio B - Illiquid MBS/ABS FundAug 2025 · 14 co-filersKenwood Fund, Ltd.Jul 2025 · 8 co-filersAristides Fund Cayman Ltd.Apr 2025 · 10 co-filersTITAN MASTERS INTERNATIONAL FUND LTDMar 2025 · 11 co-filersGRANVILLE MULTI-STRATEGY GLOBAL PARTNERS, LTD.Jan 2025 · 6 co-filersAristides Fund Cayman Ltd.Sep 2024 · 10 co-filersRichBrook Offshore Segregated Portfolio B - Illiquid MBS/ABS FundAug 2024 · 14 co-filersRichBrook Offshore Segregated Portfolio D - Agency MBSAug 2024 · 14 co-filersRichBrook Offshore Segregated Portfolio A - Agency MBSAug 2024 · 14 co-filersTITAN MASTERS INTERNATIONAL FUND LTDMar 2024 · 11 co-filersGRANVILLE MULTI-STRATEGY GLOBAL PARTNERS, LTD.Jan 2024 · 6 co-filersAristides Fund Cayman Ltd.Sep 2023 · 10 co-filersAristides Fund Cayman Ltd.Sep 2023 · 10 co-filersRichBrook Offshore Segregated Portfolio B - Illiquid MBS/ABS FundAug 2023 · 14 co-filersRichBrook Offshore Segregated Portfolio A - Agency MBSAug 2023 · 14 co-filersRichBrook Offshore Segregated Portfolio D - Agency MBSAug 2023 · 14 co-filersTITAN MASTERS INTERNATIONAL FUND LTDMar 2023 · 11 co-filersGRANVILLE MULTI-STRATEGY GLOBAL PARTNERS, LTD.Jan 2023 · 6 co-filers
Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Isaac in the interactive graph →