Investor · Bala Cynwyd, PA

William S. Harrington

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Filings

38

SEC Form D

Connections

191

co-filers

Capital

$391.6M

across filings

Active

Jan 2017

to Apr 2023

Most-connected co-filers (191)

Marc A. Singer · Bala Cynwyd, PA13 shared Robert S. Adelson · Bala Cynwyd, PA11 shared Casey D. Tansey · Menlo Park, CA9 shared Anthony C. Natale · New York, NY8 shared Wende M. Hutton · Menlo Park, CA8 shared Thomas C. Wilder · Willoughby Hills, OH7 shared David K. Myung · Lexington, MA6 shared V. K. Kadhiresan · Lexington, MA6 shared Ivana Faltysova · Grand Cayman, Cayman Islands6 shared Daryl Smith · San Francisco, CA6 shared Pat Basu · Chicago, IL6 shared Matt Carpenter · New York, NY6 shared Susan B. Mcgee · New York, NY6 shared Sach Chitnis · Chicago, IL6 shared Brad K. Vale · Lexington, MA5 shared Robert De Wolff · Richmond, VA5 shared Adam Larsson · Stockholm, V75 shared Mira Sahney · Lexington, MA5 shared Bryant Drayton · Charles City, VA5 shared Emj GP Ltd · CAMANA BAY, GRAND CAYMAN, Cayman Islands5 shared Jens Horstmann · Santa Clara, CA4 shared Sooyoung Hwang · San Francisco, CA4 shared Ashley C. Keller · Chicago, IL4 shared Blake Kirby · Salt Lake City, UT4 shared

Recent filings (38)

Neuros Medical, Inc.Aug 2025 · 16 co-filers$65.0M Neuros Medical, Inc.Aug 2025 · 16 co-filers$65.0M Hyalex Orthopaedics, Inc.Oct 2024 · 7 co-filers$18.1M Neuros Medical, Inc.Sep 2023 · 16 co-filers$20.0M Osage University Partners IV, LPApr 2023 · 13 co-filers$275.0M OUP IV AFF Partnership, LPApr 2023 · 13 co-filers$275.0M Neuros Medical, Inc.Dec 2022 · 17 co-filers$10.0M Osage University Partners IV, LPApr 2022 · 13 co-filers$350.0M OUP IV AFF Partnership, LPApr 2022 · 13 co-filers$350.0M Hyalex Orthopaedics, Inc.Jul 2021 · 19 co-filers$34.9M Neuros Medical, Inc.Nov 2020 · 15 co-filers$42.8M Neuros Medical, Inc.Jun 2020 · 11 co-filers$5.5M Neuros Medical, Inc.Oct 2019 · 11 co-filers$9.2M Route1 Inc.Jul 2019 · 12 co-filers$513K Hyalex Orthopaedics, Inc.Mar 2019 · 19 co-filers$33.0M Cultivian Sandbox Food & Agriculture Fund III, LPNov 2018 · 18 co-filers$200.0M RHEOS MEDICINES, INC.Nov 2018 · 25 co-filers RHEOS MEDICINES, INC.Oct 2018 · 23 co-filers Webster Capital II-A, L.P.Jun 2018 · 20 co-filers$151.0M Osage University Partners III, LPJun 2018 · 8 co-filers$250.0M OUP III AFF Partnership, LPJun 2018 · 8 co-filers$20.0M Route1 Inc.Apr 2018 · 23 co-filers$968K RHEOS MEDICINES, INC.Apr 2018 · 17 co-filers Webster Capital II-A, L.P.Nov 2017 · 20 co-filers$150.0M Cultivian Sandbox Food & Agriculture Fund III, LPNov 2017 · 18 co-filers$200.0M

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