Investor · New York, NY

William Singer

Open William in the network graph →

Filings

10

SEC Form D

Connections

23

co-filers

Capital

$41.0M

across filings

Active

Mar 2013

to Oct 2025

Most-connected co-filers (23)

Robert J. Weinstein · New York, NY9 shared Bruce T. Bernstein · New York, NY6 shared Joshua Silverman · New York, NY6 shared Jonathan L. Schechter · New York, NY4 shared Daniel A. Alkon · New York, NY4 shared James S. New · Plantation, FL3 shared Alan J. Tuchman · New York, NY3 shared Ralph Bean · Bridgeport, WV3 shared John Abeles · Manassas, VA3 shared Mark Scianna · Campbell, CA2 shared Eric Rubenstein · BELLAIRE, TX2 shared George T. Perry · New York, NY2 shared James Gottlieb · New York, NY2 shared Jay M. Haft · Newark, NJ2 shared Tony L. Lonstein · Encino, CA2 shared Mark S. Flynn · Palo Alto, CA2 shared Robert Ephron · NEW YORK, NY1 shared Paul E. Freiman · EMERYVILLE, CA1 shared Charles S. Ramat · Newark, NJ1 shared Shana Phares · New York, NY1 shared Larry D. Altstiel, Md · Newark, NJ1 shared Kenneth Gorelick · New York, NY1 shared Susanne Wilke · New York, NY1 shared

Recent filings (10)

TAO Synergies Inc.Oct 2025 · 10 co-filers$11.0M TAO Synergies Inc.Oct 2025 · 10 co-filers$11.0M Synaptogenix, Inc.Jun 2025 · 10 co-filers$5.5M Synaptogenix, Inc.Jun 2025 · 10 co-filers$5.5M Synaptogenix, Inc.Sep 2024 · 13 co-filers$3.2M Synaptogenix, Inc.Sep 2024 · 13 co-filers$3.2M Synaptogenix, Inc.Jun 2021 · 15 co-filers$12.5M Synaptogenix, Inc.Jun 2021 · 15 co-filers$12.5M Synaptogenix, Inc.Feb 2021 · 15 co-filers$14.0M Synaptogenix, Inc.Feb 2021 · 15 co-filers$14.0M Neurotrope, Inc.Dec 2016 · 18 co-filers$24.5M Neurotrope, Inc.Dec 2016 · 18 co-filers$24.5M Neurotrope, Inc.Nov 2015 · 13 co-filers$20.0M Neurotrope, Inc.Nov 2015 · 13 co-filers$20.0M Neurotrope, Inc.Oct 2013 · 10 co-filers$1.1M Neurotrope, Inc.Oct 2013 · 10 co-filers$1.1M NEUROTROPE BIOSCIENCE, INC.Sep 2013 · 11 co-filers$12.6M NEUROTROPE BIOSCIENCE, INC.Sep 2013 · 11 co-filers$12.6M NEUROTROPE BIOSCIENCE, INC.Mar 2013 · 7 co-filers$15.0M NEUROTROPE BIOSCIENCE, INC.Mar 2013 · 7 co-filers$15.0M

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