NAPCO Security Technologies (NSSC) had the best month in 1983 by a US stock in May 1983, returning 88.9%.

ASSET	MONTH	% RETURN
NAPCO Security Technologies (NSSC)	May 1983	88.91%
Educational Development (EDUC)	November 1983	55.71%
Electro-Sensors (ELSE)	February 1983	52.92%
NAPCO Security Technologies (NSSC)	February 1983	50.02%
Amtech Systems (ASYS)	September 1983	50%
Electro-Sensors (ELSE)	July 1983	49.95%
Cohu (COHU)	January 1983	48.88%
Team (TISI)	May 1983	47.22%
Patrick Industries (PATK)	January 1983	47.03%
Mount Logan Capital Inc Common Stock (MLCI)	April 1983	46.67%
Dillard's (DDS)	March 1983	46.48%
Dominion Energy (D)	May 1983	45.14%
InterDigital (IDCC)	September 1983	43.4%
Thermo Fisher Scientific (TMO)	January 1983	42.41%
Gentex (GNTX)	February 1983	41.35%
Bath & Body Works (BBWI)	May 1983	40.88%
Hecla Mining (HL)	January 1983	40.14%
Bridgford Foods (BRID)	January 1983	39.98%
Danaher (DHR)	April 1983	39.18%
Team (TISI)	August 1983	38.98%
Tejon Ranch (TRC)	December 1983	38.63%
Stewart Information Services (STC)	April 1983	38.55%
Sherwin-Williams (SHW)	March 1983	37.85%
Universal Security Instruments (UUU)	April 1983	37.14%
Apple (AAPL)	January 1983	36.92%