Investor · Cambridge, MA

Walter K. Brown

Open Walter in the network graph →

Filings

20

SEC Form D

Connections

101

co-filers

Capital

$3.2M

across filings

Active

Feb 2020

to Jan 2023

Most-connected co-filers (101)

Nabil J. Elkouh · Cambridge, MA16 shared Michael J. Higgins · Cambridge, MA15 shared Shaker J. Sadasivam · Cambridge, MA14 shared James P. Pearson · Cambridge, MA11 shared Eric R. Olson · Cambridge, MA11 shared Magnus P. Sjocrona · Stockholm, V77 shared Mark G. Currie · Cambridge, MA7 shared Mark G. Currie · Cambridge, MA6 shared Khoso E. Baluch · Miami, FL5 shared Joshua M. Hare · Miami, FL5 shared Nataliya A. Agafonova · Miami, FL5 shared Ursula E. Ungaro · Miami, FL5 shared Josh G. Israel · Boston, MA5 shared Lisa A. Locklear · Miami, FL5 shared Neil E. Hare · Miami, FL5 shared Paul M. Lehr · Miami, FL5 shared Patrik N. Burnas · Luxembourg, Luxembourg5 shared Rock E. Soffer · Miami, FL5 shared Wa'El Hashad · Miami, FL5 shared Bob Saris · Brooklyn, NY4 shared Benjamin J. Cravatt · Cambridge, MA4 shared Adam L. Bensley · New York, NY4 shared Pavel Khodorkovskiy · New York, NY4 shared Eldon Klaassen · New York, NY4 shared

Recent filings (20)

Sea Pharmaceuticals, LLCMay 2025 · 19 co-filers$1.7M Sea Pharmaceuticals, LLCMay 2025 · 19 co-filers$1.7M Sea Pharmaceuticals, LLCFeb 2025 · 20 co-filers$2.2M Sea Pharmaceuticals, LLCFeb 2025 · 20 co-filers$2.2M Longeveron Inc.Jul 2024 · 33 co-filers$9.5M Longeveron Inc.Jun 2024 · 32 co-filers$9.4M Longeveron Inc.Apr 2024 · 35 co-filers$12.4M Longeveron Inc.Jan 2024 · 35 co-filers$2.6M Longeveron Inc.Oct 2023 · 35 co-filers$8.4M Sea Pharmaceuticals, LLCOct 2023 · 22 co-filers$2.2M Sea Pharmaceuticals, LLCOct 2023 · 22 co-filers$2.2M Sea Pharmaceuticals, LLCJan 2023 · 23 co-filers$2.0M SYSO LLCOct 2022 · 14 co-filers$10.0M SYSO LLCOct 2022 · 14 co-filers$10.0M Tractor Beverages, Inc.May 2022 · 20 co-filers$60.0M SYSO LLCMay 2022 · 11 co-filers$3.5M Tractor Beverages, Inc.May 2022 · 20 co-filers$15.0M Sea Pharmaceuticals, LLCJan 2022 · 23 co-filers$2.0M Austin Cocktails Investments, LLCMar 2021 · 11 co-filers$7.2M Sea Pharmaceuticals, LLCFeb 2021 · 23 co-filers$2.0M VISEON, INC.Feb 2020 · 14 co-filers$29.4M Austin Cocktails Investments, LLCFeb 2020 · 11 co-filers$5.0M VISEON, INC.Feb 2020 · 14 co-filers$29.4M

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