Tesla (TSLA) had the highest return between 2013 and 2014 by a US stock in the S&P 500 (GSPC), returning 535.5%.

ASSET	YEARS	% RETURN
Tesla (TSLA)	2013-2014	535.46%
Micron Technology (MU)	2013-2014	430.45%
Incyte (INCY)	2013-2014	337.26%
Delta Air Lines (DAL)	2013-2014	312.98%
Southwest Airlines (LUV)	2013-2014	311.55%
DexCom (DXCM)	2013-2014	296.33%
Enphase Energy (ENPH)	2013-2014	269.25%
Netflix (NFLX)	2013-2014	258.8%
Skyworks Solutions (SWKS)	2013-2014	247.98%
Best Buy (BBY)	2013-2014	236.23%
Super Micro Computer (SMCI)	2013-2014	232.51%
Broadcom (AVGO)	2013-2014	221.98%
Electronic Arts (EA)	2013-2014	218.31%
Diamondback Energy (FANG)	2013-2014	207.19%
Axon Enterprise (AXON)	2013-2014	190.99%
Facebook (META)	2013-2014	184.33%
HP (HPQ)	2013-2014	182.14%
NXP Semiconductors (NXPI)	2013-2014	181.92%
United Airlines (UAL)	2013-2014	180.7%
Live Nation Entertainment (LYV)	2013-2014	178.66%
Vertex Pharmaceuticals (VRTX)	2013-2014	177.12%
Constellation Brands Inc Class A (STZ)	2013-2014	173.07%
Corpay (CPAY)	2013-2014	172.56%
Western Digital (WDC)	2013-2014	162.67%
Huntington Ingalls Industries (HII)	2013-2014	161.8%