Investor · Fremont, MI

Jack A. Siebers

Open Jack in the network graph →

Filings

6

SEC Form D

Connections

35

co-filers

Capital

—

across filings

Active

Mar 2009

to Mar 2026

Most-connected co-filers (35)

William L. Johnson · Fremont, MI6 shared Donald Vansingel · Fremont, MI6 shared Kenneth J. Schuiteman · Fremont, MI5 shared Thomas A. Schmitt · New York, NY3 shared John W. Alderman · NEW YORK, NY3 shared Andrew S. Paul · GREENWICH, CT3 shared Paul T. Jones · GREENWICH, CT3 shared John R. Torell · GREENWICH, CT3 shared Harbinger Alternative Associates, Llc · Atlanta, GA3 shared Cheryl M. Mounce · Richmond, VA3 shared A. G. Goodykoontz · Richmond, VA3 shared Harbinger Sports Associates, Llc · Atlanta, GA3 shared Harry L. Wiberg · Fremont, MI3 shared Horace P. Whitworth · Richmond, VA3 shared Matthew G. Thompson · Richmond, VA3 shared Richard E. Dunning · Fremont, MI3 shared David L. Mangin · Fremont, MI3 shared Kent B. Shantz · Fremont, MI3 shared Scott E. Dakers · Grand Cayman, Cayman Islands3 shared Michael A. Dekuiper · Fremont, MI3 shared Monica C. Holmes · Fremont, MI3 shared Jack Hendon · Sparta, MI3 shared Donald C. Wilson · Fremont, MI3 shared John G. Macfarlane · Greenwich, CT3 shared

Recent filings (6)

HSP LVA Co-Invest, LPMar 2026 · 5 co-filers Harbinger Sports Partners Fund I-A, LPMar 2026 · 5 co-filers Harbinger Sports Partners Fund I, LPDec 2025 · 15 co-filers FREMONT MICHIGAN INSURACORP INCMar 2011 · 23 co-filers FREMONT MICHIGAN INSURACORP INCMar 2010 · 27 co-filers FREMONT MICHIGAN INSURACORP INCMar 2009 · 25 co-filers

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