Gladstone Capital (GLAD) had the highest return between 1998 and 2008 by a US stock, returning 3,422,500%.

ASSET	YEARS	% RETURN
Gladstone Capital (GLAD)	1998-2008	3,422,500%
Global Ship Lease (GSL)	1998-2008	1,384,370%
MAG Silver (MAG)	1998-2008	878,340%
Know Labs (KNW)	1998-2008	534,224.43%
Ring Energy (REI)	1998-2008	146,566.67%
Weatherford International (WFRD)	1998-2008	119,942.59%
Perspective Therapeutics (CATX)	1998-2008	66,566.67%
Riley Exploration Permian (REPX)	1998-2008	64,100.74%
Flexible Solutions International (FSI)	1998-2008	37,464.71%
Frontline (FRO)	1998-2008	19,305.77%
India Globalization Capital (IGC)	1998-2008	17,829.76%
Monster Beverage (MNST)	1998-2008	14,606.32%
Future Fintech (FTFT)	1998-2008	12,400%
Northern Oil & Gas (NOG)	1998-2008	9,354.68%
Companhia Siderurgica Nacional ADR (SID)	1998-2008	8,069.43%
First Majestic Silver (AG)	1998-2008	7,829.78%
TherapeuticsMD (TXMD)	1998-2008	7,439.95%
Houston American Energy (HUSA)	1998-2008	6,731.48%
Broadwind Energy (BWEN)	1998-2008	5,300.22%
Smith & Wesson Brands (SWBI)	1998-2008	4,444.44%
Cognizant Technology Solutions Corp Class A (CTSH)	1998-2008	4,235.16%
Clean Harbors (CLH)	1998-2008	3,659.18%
Comtech Telecommunications (CMTL)	1998-2008	3,434.6%
Oramed Pharmaceuticals (ORMP)	1998-2008	3,134.28%
Gerdau SA ADR (GGB)	1998-2008	2,970.85%