Palo Alto Networks (PANW) had the highest return between 2014 and 2015 by a US stock in the S&P 500 (GSPC), returning 210.6%.

ASSET	YEARS	% RETURN
Palo Alto Networks (PANW)	2014-2015	210.6%
Electronic Arts (EA)	2014-2015	200.09%
Broadcom (AVGO)	2014-2015	182.33%
Skyworks Solutions (SWKS)	2014-2015	175.89%
Edwards Lifesciences (EW)	2014-2015	140.5%
DexCom (DXCM)	2014-2015	132.34%
Southwest Airlines (LUV)	2014-2015	131.7%
EPAM Systems (EPAM)	2014-2015	126.05%
Centene (CNC)	2014-2015	123.24%
Royal Caribbean Cruises (RCL)	2014-2015	121.88%
Monster Beverage (MNST)	2014-2015	119.45%
Kroger (KR)	2014-2015	118.55%
Netflix (NFLX)	2014-2015	118.28%
Caesars Entertainment (CZR)	2014-2015	115.69%
Incyte (INCY)	2014-2015	115.52%
NVIDIA (NVDA)	2014-2015	114.28%
Paycom Soft (PAYC)	2014-2015	110.22%
Constellation Brands Inc Class A (STZ)	2014-2015	104.96%
Take-Two Interactive Software (TTWO)	2014-2015	101.74%
Keurig Dr Pepper (KDP)	2014-2015	100.84%
Global Payments (GPN)	2014-2015	99.2%
O’Reilly Automotive (ORLY)	2014-2015	97.34%
Regeneron Pharmaceuticals (REGN)	2014-2015	96.86%
Ulta Beauty (ULTA)	2014-2015	92.29%
Facebook (META)	2014-2015	90.88%