Microchip Technology (MCHP) had the highest return in August 1993 by a large-cap US stock, returning 66.1%.

ASSET	MONTH	% RETURN
Microchip Technology (MCHP)	August 1993	66.08%
DR Horton (DHI)	August 1993	37.96%
Johnson Controls International (JCI)	August 1993	37.04%
Western Digital (WDC)	August 1993	36.37%
Williams-Sonoma (WSM)	August 1993	34.09%
Advanced Micro Devices (AMD)	August 1993	33.5%
NVR (NVR)	August 1993	33.33%
Best Buy (BBY)	August 1993	31.83%
Lattice Semiconductor (LSCC)	August 1993	31.58%
Teva Pharma Industries Ltd ADR (TEVA)	August 1993	26.47%
Comcast (CMCSA)	August 1993	26.14%
Genesis Healthcare (GEN)	August 1993	24.3%
Chubb (CB)	August 1993	23.56%
Biogen (BIIB)	August 1993	23.54%
Intel (INTC)	August 1993	22.97%
Koninklijke Philips NV ADR (PHG)	August 1993	22.66%
Jabil Circuit (JBL)	August 1993	22.23%
Telefonica SA ADR (TEF)	August 1993	21.25%
MasTec (MTZ)	August 1993	21.22%
Autodesk (ADSK)	August 1993	20.96%
Cardinal Health (CAH)	August 1993	20%
Costco Wholesale (COST)	August 1993	19.69%
Jacobs Solutions (J)	August 1993	19.51%
Electronic Arts (EA)	August 1993	18.38%
Shell PLC ADR (SHEL)	August 1993	17.91%

Large-cap stocks are treated as having a market cap of $10B+.