Investor · New York, NY
Steffen H. Kastner
Open Steffen in the network graph →Filings
35
SEC Form D
Connections
211
co-filers
Capital
$1.3B
across filings
Active
Feb 2013
to Feb 2026
Most-connected co-filers (211)
Bryan E. Mckigney · New York, NY26 sharedBrady Dougan · New York, NY16 sharedRobert E. Anderson · Morrisville, NC16 sharedLuis J. Rubio · Grand Cayman, Cayman Islands13 sharedMichael M. Carpenter · Irvine, CA13 sharedJanet L. Schinderman · New York, NY13 sharedChad Bessinger · Centerville, UT12 sharedJohn E. Decooman · Vancouver, British Columbia, Canada12 sharedJesse L. Ausubel · New York, NY12 sharedCassandra E. Gee · Vancouver, British Columbia, Canada11 sharedJacob D. Chase · Denver, CO11 sharedAdvantage Advisers Multi-Manager, L.L.C · New York, NY10 sharedZack D. Kobilca · Denver, CO10 sharedMichael J. Murphy · New York, NY10 sharedTodd Milbourn · New York, NY10 sharedAdvantage Advisers Management, L.L.C · New York, NY9 sharedJean-Christophe H. Germani · New York, NY7 sharedWilliam Eckhardt · CHICAGO, IL5 sharedKeith D. Glenfield · New York, NY4 sharedTimothy P. Faenza · New York, NY4 sharedVishal C. Bakshi · New York, NY4 sharedJames L. Costabile · New York, NY4 sharedT.J. J. Carella · New York, NY4 sharedMatthias H. Hieber · New York, NY4 shared
Recent filings (35)
Advantage Advisers Xanthus Fund, L.L.C.Feb 2026 · 6 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2026 · 1 co-filerAdvantage Advisers Xanthus Fund, L.L.C.Feb 2025 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2025 · 3 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2024 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2024 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2023 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2023 · 16 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2022 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2022 · 3 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2021 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2021 · 16 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2020 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2020 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2019 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2019 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2018 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2018 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Mar 2017 · 16 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2017 · 16 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2017 · 3 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2016 · 3 co-filersAdvantage Advisers Xanthus Fund, L.L.C.Feb 2016 · 12 co-filersCheckers Control Partnership, L.P.Jun 2015 · 116 co-filersADVANTAGE ADVISERS GLOBAL GROWTH, L.L.C.Feb 2015 · 3 co-filers
Derived from public SEC Form D (Reg D) filings; entities resolved probabilistically. See Steffen in the interactive graph →