Investor · Cambridge, MA

David Walt

Open David in the network graph →

Filings

52

SEC Form D

Connections

209

co-filers

Capital

$233.3M

across filings

Active

Apr 2021

to Oct 2025

Most-connected co-filers (209)

Keith L. Crandell · Chicago, IL17 shared John Connolly · Boston, MA15 shared Joseph D. Touizer · Ft Lauderdale, FL12 shared Martin Madaus · Boston, MA9 shared Douglas Cole · Lexington, MA8 shared Kevin Hrusovsky · Boston, MA6 shared James Nahirny · Atlanta, GA5 shared Andrea Jackson · San Carlos, CA5 shared Urs Cete · New York, NY5 shared David S. Snyder · Skokie, IL5 shared Matthew A. Lindenbaum · NEW YORK, NY4 shared Herbert M. Rouse · Kinston, NC4 shared Schf (Gpe), LLC · Menlo Park, CA4 shared Allen V. Ambrose · Vancouver, British Columbia, Canada4 shared Matthew Posard · San Carlos, CA4 shared Marijn Dekkers · Lexington, MA4 shared Terry Lo · Cambridge, MA4 shared David E. Heath · Kinston, NC4 shared Marc A. Samit · NEW YORK, NY4 shared Robert Carson · Cambridge, MA3 shared Todd K. Stephenson · Sugar Land, TX3 shared John S. Mcgregor · Milwaukee, WI3 shared Travis K. Ohnesorge · Sugar Land, TX3 shared Simona Levi · Cambridge, MA3 shared

Recent filings (52)

Everest Biolabs, Inc.Mar 2026 · 4 co-filers$5.7M Vizgen, Inc.Jan 2026 · 6 co-filers$50.0M Vizgen, Inc.Oct 2025 · 10 co-filers$9.5M Vizgen, Inc.Oct 2024 · 9 co-filers Protillion Biosciences, lnc.Dec 2022 · 7 co-filers$20.7M Protillion Biosciences, lnc.Dec 2022 · 7 co-filers$20.7M Vizgen, Inc.May 2022 · 10 co-filers$105.2M Sherlock Biosciences, Inc.Mar 2022 · 10 co-filers$80.0M Sherlock Biosciences, Inc.Mar 2022 · 10 co-filers$80.0M Arbor Biotechnologies, Inc.Nov 2021 · 21 co-filers$215.0M Arbor Biotechnologies, Inc.Nov 2021 · 21 co-filers$215.0M Vizgen, Inc.Apr 2021 · 9 co-filers$37.0M Quanterix CorpJul 2019 · 9 co-filers$6.5M Quanterix CorpJul 2019 · 9 co-filers$6.5M Ultivue, Inc.Jun 2019 · 21 co-filers$26.5M Sherlock Biosciences, Inc.Apr 2019 · 7 co-filers$33.8M Sherlock Biosciences, Inc.Apr 2019 · 7 co-filers$33.8M Ultivue, Inc.Feb 2018 · 19 co-filers$20.5M EXICURE, INC.Oct 2017 · 20 co-filers$43.1M EXICURE, INC.Oct 2017 · 20 co-filers$52.6M Quanterix CorpJun 2017 · 27 co-filers$8.5M Arbor Biotechnologies, Inc.Jun 2017 · 17 co-filers$15.6M CTA Choice SPAQApr 2017 · 2 co-filers Cerulean Pharma Inc.Oct 2016 · 24 co-filers$1 Cerulean Pharma Inc.Oct 2016 · 24 co-filers$1

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