NetApp (NTAP) had the highest return in August 2016 by a US stock in the S&P 500 (GSPC), returning 31.5%.

ASSET	MONTH	% RETURN
NetApp (NTAP)	August 2016	31.52%
Zebra Technologies (ZBRA)	August 2016	31.48%
IDEXX Laboratories (IDXX)	August 2016	20.6%
Insulet (PODD)	August 2016	19.54%
Micron Technology (MU)	August 2016	19.41%
Targa Resources (TRGP)	August 2016	18.97%
Genesis Healthcare (GEN)	August 2016	18.15%
Williams Companies (WMB)	August 2016	18.04%
Best Buy (BBY)	August 2016	15.18%
Devon Energy (DVN)	August 2016	14.81%
Skyworks Solutions (SWKS)	August 2016	14.04%
Autodesk (ADSK)	August 2016	13.6%
Applied Materials (AMAT)	August 2016	13.38%
Nordson (NDSN)	August 2016	12.34%
Arista Networks (ANET)	August 2016	12.01%
Westinghouse Air Brake Technologies (WAB)	August 2016	11.95%
Arch Capital (ACGL)	August 2016	11.86%
Ball (BALL)	August 2016	11.81%
Bank of America (BAC)	August 2016	11.67%
Citizens Financial (CFG)	August 2016	11.33%
Mosaic (MOS)	August 2016	11.29%
Morgan Stanley (MS)	August 2016	11.16%
Microchip Technology (MCHP)	August 2016	11.13%
Motorola Solutions (MSI)	August 2016	10.94%
Charles Schwab (SCHW)	August 2016	10.45%