Investor · New York, NY

Hallbjorn Karlsson

Open Hallbjorn in the network graph →

Filings

20

SEC Form D

Connections

106

co-filers

Capital

$44.0M

across filings

Active

Jun 2021

to Oct 2025

Most-connected co-filers (106)

Grace Ray · New York, NY16 shared Gregg Rubin · New York, NY16 shared John Heath · New York, NY12 shared Jonathan Flint · Phoenix, AZ12 shared Anthony Sciortino · New York, NY9 shared David Albertsson · New York, NY9 shared Mark Alexander · New York, NY8 shared Nicolaas Bevers · New York, NY7 shared Sigurjon Rafnsson · New York, NY6 shared Yannick M. Goupil · Montreal, Quebec, Canada5 shared Joshua Lefkowitz · NEW YORK, NY5 shared John M. Becker · Oakton, VA5 shared Daniel Macaya · CAMBRIDGE, MA5 shared Brant Wutzl · New York, NY5 shared J. P. Haynes · Waterloo, Ontario, Canada5 shared Michael M. Hadley · New York, NY5 shared Caleb V. Landon · Roseville, CA5 shared Rod Fontenot · New York, NY5 shared Nelson Joseph · NEW YORK, NY5 shared Elliot Shifrin · New York, NY5 shared Justin Plouffe · NEW YORK, NY5 shared Stephen Platt · New York, NY5 shared Dmitry Kalichkin · Miami, FL5 shared Garth Schultheis · Durango, CO5 shared

Recent filings (20)

Icelandic Provisions, Inc.Oct 2025 · 32 co-filers$1.7M Ajax Therapeutics, Inc.May 2024 · 11 co-filers$95.0M Cellebration Life Sciences, Inc.Aug 2023 · 11 co-filers$20.0M Icelandic Provisions, Inc.May 2023 · 32 co-filers$20.0M Icelandic Provisions, Inc.Jan 2023 · 26 co-filers$11.5M Icelandic Provisions, Inc.Aug 2022 · 26 co-filers$8.5M Cellebration Life Sciences, Inc.Jun 2022 · 11 co-filers$20.0M Cellebration Life Sciences, Inc.May 2022 · 11 co-filers$20.0M Icelandic Provisions, Inc.Apr 2022 · 26 co-filers$5.0M Icelandic Provisions, Inc.Nov 2021 · 17 co-filers$10.6M Icelandic Provisions, Inc.Nov 2021 · 17 co-filers$10.6M Cellebration Life Sciences, Inc.Jun 2021 · 11 co-filers$20.0M Ajax Therapeutics, Inc.Jun 2021 · 11 co-filers$40.0M Icelandic Provisions, Inc.Feb 2021 · 19 co-filers$3.5M Icelandic Provisions, Inc.Feb 2021 · 19 co-filers$3.5M Icelandic Provisions, Inc.Feb 2019 · 37 co-filers$4.0M Icelandic Provisions, Inc.May 2018 · 35 co-filers$5.0M Icelandic Provisions, Inc.Jan 2017 · 33 co-filers$9.1M LICS Capital, LLCNov 2016 · 5 co-filers$50.0M LICS Capital, LLCApr 2016 · 5 co-filers$50.0M SPECTRUM PHARMACEUTICALS INCApr 2016 · 25 co-filers$3.0M SPECTRUM PHARMACEUTICALS INCJul 2013 · 18 co-filers$27.5M

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