Genasys (GNSS) had the highest return in April 1998 by a US stock, returning 139.5%.

ASSET	MONTH	% RETURN
Genasys (GNSS)	April 1998	139.48%
OneSpan (OSPN)	April 1998	104.16%
AMCON Distributing (DIT)	April 1998	100%
Siebert Financial (SIEB)	April 1998	76.27%
Live Ventures (LIVE)	April 1998	70.67%
Mount Logan Capital Inc Common Stock (MLCI)	April 1998	68.48%
Harmony Gold Mining (HMY)	April 1998	59.83%
Intrusion (INTZ)	April 1998	55.32%
Universal Insurance (UVE)	April 1998	54.53%
Eterna Therapeutics (ERNA)	April 1998	53.85%
AngloGold Ashanti (AU)	April 1998	50%
RCI Hospitality (RICK)	April 1998	48.65%
Lisata Therapeutics (LSTA)	April 1998	45.45%
PetMed Express (PETS)	April 1998	43.74%
Radcom (RDCM)	April 1998	43.06%
Stabilis Solutions (SLNG)	April 1998	38.78%
Americas Car-Mart (CRMT)	April 1998	38.77%
Option Care Health (OPCH)	April 1998	38.46%
GT Biopharma (GTBP)	April 1998	38.09%
China Natural Resources (CHNR)	April 1998	37.88%
Odyssey Marine Exploration (OMEX)	April 1998	37.5%
Monster Beverage (MNST)	April 1998	36.96%
Argan (AGX)	April 1998	36.59%
Group 1 Automotive (GPI)	April 1998	36.36%
Theriva Biologics (TOVX)	April 1998	36.36%