Quanex Building Products (NX) had the highest return in April 1983 by a US stock, returning 50%.

ASSET	MONTH	% RETURN
Quanex Building Products (NX)	April 1983	50%
Mount Logan Capital Inc Common Stock (MLCI)	April 1983	46.67%
Park Electrochemical (PKE)	April 1983	39.61%
Danaher (DHR)	April 1983	39.02%
Stewart Information Services (STC)	April 1983	38.55%
Universal Security Instruments (UUU)	April 1983	37.14%
Thermo Fisher Scientific (TMO)	April 1983	36.11%
Valhi (VHI)	April 1983	35.71%
SEI Investments (SEIC)	April 1983	34.72%
Fonar (FONR)	April 1983	29.58%
Western Digital (WDC)	April 1983	28.98%
Ford Motor (F)	April 1983	28.42%
Gap (GAP)	April 1983	27.62%
Espey Mfg & Electronics (ESP)	April 1983	27.5%
Biglari (BH)	April 1983	27.27%
BHP (BHP)	April 1983	26.52%
Molson Coors Brewing (TAP)	April 1983	26.23%
Donaldson (DCI)	April 1983	25.33%
VF (VFC)	April 1983	24.99%
Standex International (SXI)	April 1983	24.5%
Kimberly-Clark (KMB)	April 1983	23.56%
North European Oil Royalty Trust (NRT)	April 1983	23.48%
Leggett & Platt (LEG)	April 1983	23.08%
VSE (VSEC)	April 1983	21.87%
Kinross Gold (KGC)	April 1983	21.74%