Investor · Waltham, MA

Charles K. Pieper

Open Charles in the network graph →

Filings

10

SEC Form D

Connections

52

co-filers

Capital

$7.5M

across filings

Active

Aug 2019

to May 2025

Most-connected co-filers (52)

Joseph D. Pennington · Prince George, VA5 shared Peter K. Finn, Esq · Boston, MA5 shared Brian Finn · New York, NY5 shared Rubina N. Toorawa · Ebene, O45 shared Nelson K. Stacks · Waltham, MA5 shared Peter K. Farrell, Ph.D · Waltham, MA5 shared Sarah Bhagat · MENLO PARK, CA4 shared Leon Hirth · New York, NY3 shared Spencer Morgan · Boston, MA3 shared Lawrence Leisure · CHICAGO, IL3 shared Harold "Hank" Handelsmen · Cambridge, MA3 shared Julian Baker · NEW YORK, NY3 shared Steve Shulman · Boston, MA3 shared Victor A. Murray · Grand Cayman, Cayman Islands3 shared DC Energy Management LP · McLean, VA3 shared Felix Baker · NEW YORK, NY3 shared Jonathan Havice · MINNETONKA, MN2 shared Cormac L. Sheehan · Georgetown, Cayman Islands2 shared Tom J. Parsons · Grand Cayman, Cayman Islands2 shared Mark A. Hollis · Indianapolis, IN2 shared Nathaniel A. Manning · Kensington, CA2 shared Eric A. Engler · Kensington, CA2 shared Matthew Vega-Sanz · Miami, FL2 shared Andrew Davidson · Vancouver, British Columbia, Canada2 shared

Recent filings (10)

WaveGuide CorpMay 2025 · 17 co-filers$6.5M WaveGuide CorpMay 2024 · 17 co-filers$4.3M Waveguide CorpMar 2023 · 12 co-filers$33.1M Waveguide CorpMar 2023 · 12 co-filers$33.1M Waveguide CorpSep 2021 · 16 co-filers$5.0M Our Kettle, Inc.May 2021 · 11 co-filers$25.0M Cambridge Semantics IncApr 2021 · 13 co-filers$10.0M Our Kettle, Inc.Sep 2020 · 5 co-filers$4.7M Greenlight Financial Technology, Inc.Sep 2020 · 17 co-filers$215.0M Greenlight Financial Technology, Inc.Aug 2019 · 11 co-filers$54.1M Waveguide CorpJun 2019 · 14 co-filers$5.0M Waveguide CorpJun 2019 · 14 co-filers$5.0M

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