Investor · Cambridge, MA

Robert M. Armstrong, Ph.D

Open Robert in the network graph →

Filings

19

SEC Form D

Connections

61

co-filers

Capital

$53.6M

across filings

Active

Aug 2018

to Jul 2025

Most-connected co-filers (61)

Jeff L. Rothenberger · Franklin, TN6 shared Jeffry Weinhuff · Copley, OH6 shared Helen M. Vaughan · Boston, MA6 shared Brad E. Lindemann · Brenham, TX6 shared Ronald T. Rudloff · Cypress, TX6 shared Emilio C. Gonzales · Boston, MA6 shared Jonathan P. Weitz · Boston, MA6 shared Michael Roth · Fort Collins, CO6 shared Scott C. Jones · Grand Cayman, Cayman Islands6 shared Kevin W. Owen · Crozet, VA6 shared Martin Vogelbaum · New York, NY6 shared Gino M. Santini · Cambridge, MA6 shared Edwin Kania · LOS ANGELES, CA5 shared Drew Anwyll · Toronto, Ontario, Canada5 shared Kenneth V. Deregt · New York, NY5 shared Peter B. Finn · Boston, MA5 shared Rami Elghandour · Gaithersburg, MD5 shared Alan E. Walts · Cambridge, MA5 shared Arne Brock-Utne · Walnut Creek, CA5 shared Gino Santini · Boston, MA5 shared David T. Lubner · Gaithersburg, MD5 shared Mark Reynoso · LOS ANGELES, CA4 shared Damia M. Tormo, Ph.D · Cambridge, MA4 shared David Pfeffer · New York, NY4 shared

Recent filings (19)

Artax Biopharma, Inc.Jul 2025 · 25 co-filers$11.0M Artax Biopharma, Inc.May 2022 · 20 co-filers$25.8M Artax Biopharma, Inc.Jan 2022 · 14 co-filers$23.2M Artax Biopharma, Inc.Feb 2021 · 14 co-filers$3.0M Artax Biopharma, Inc.May 2020 · 17 co-filers$2.0M Ryder Court Global Emerging Markets Opportunities Fund (DST)Feb 2019 · 11 co-filers Ryder Court Emerging Markets Small Cap Fund (DST)Feb 2019 · 11 co-filers Ryder Court Asia ex-Japan Small & Mid-Cap Fund (DST)Feb 2019 · 11 co-filers Ryder Court Global Opportunities Fund (DST)Feb 2019 · 11 co-filers Joust Labs, Inc.Feb 2019 · 5 co-filers$20K Ryder Court European Concentrated Value Fund (DST)Feb 2019 · 11 co-filers Ryder Court International Select Fund DSTFeb 2019 · 11 co-filers Joust Labs, Inc.Aug 2018 · 3 co-filers$4.5M STEELPATH MLP PARTNERS, LPMar 2018 · 4 co-filers STEELPATH MLP PARTNERS, LPMar 2017 · 4 co-filers STEELPATH MLP PARTNERS, LPApr 2016 · 4 co-filers Artax Biopharma, Inc.Oct 2015 · 16 co-filers$10.0M STEELPATH MLP PARTNERS, LPDec 2014 · 4 co-filers Artax Biopharma, Inc.Nov 2014 · 13 co-filers$2.0M

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