AngloGold Ashanti (AU) had the best month in August 2015 by a large-cap US stock in August 2015, returning 35.3%.

ASSET	MONTH	% RETURN
AngloGold Ashanti (AU)	August 2015	35.33%
Gold Fields Ltd ADR (GFI)	August 2015	25.19%
Paycom Soft (PAYC)	August 2015	20.4%
Sociedad Quimica y Minera de Chile SA ADR B (SQM)	August 2015	16.15%
Best Buy (BBY)	August 2015	14.06%
Topbuild (BLD)	August 2015	12.44%
NVIDIA (NVDA)	August 2015	12.24%
Agnico Eagle Mines (AEM)	August 2015	11.86%
Incyte (INCY)	August 2015	11.42%
Sarepta Therapeutics (SRPT)	August 2015	11.21%
Huazhu (HTHT)	August 2015	11.18%
DexCom (DXCM)	August 2015	10.75%
Sysco (SYY)	August 2015	10.69%
Applied Industrial Technologies (AIT)	August 2015	10.38%
Ubiquiti Networks (UI)	August 2015	9.4%
BWX Technologies (BWXT)	August 2015	8.62%
Motorola Solutions (MSI)	August 2015	7.89%
Franco-Nevada (FNV)	August 2015	7.73%
Martin Marietta Materials (MLM)	August 2015	7.39%
TechnipFMC (FTI)	August 2015	7.05%
First Solar (FSLR)	August 2015	7.02%
Constellation Brands Inc Class A (STZ)	August 2015	6.39%
JM Smucker (SJM)	August 2015	6.3%
Tenaris SA ADR (TS)	August 2015	6.01%
Eagle Materials (EXP)	August 2015	5.94%

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