Caesars Entertainment (CZR) had the highest return on December 30, 2011 by a US stock in the S&P 500 (GSPC), returning 6.3%.

ASSET	DATE	% RETURN
Caesars Entertainment (CZR)	12/30/2011	6.25%
T-Mobile US (TMUS)	12/30/2011	5.6%
HCA (HCA)	12/30/2011	3.82%
Seagate Technology (STX)	12/30/2011	3.6%
Bank of America (BAC)	12/30/2011	3.15%
MGM Resorts International (MGM)	12/30/2011	2.56%
First Solar (FSLR)	12/30/2011	2.43%
Halliburton (HAL)	12/30/2011	2.37%
Universal Health Services (UHS)	12/30/2011	2.1%
Valero Energy (VLO)	12/30/2011	1.69%
Schlumberger (SLB)	12/30/2011	1.59%
Vertex Pharmaceuticals (VRTX)	12/30/2011	1.53%
Take-Two Interactive Software (TTWO)	12/30/2011	1.5%
Gilead Sciences (GILD)	12/30/2011	1.49%
Apollo Global Management LLC Class A (APO)	12/30/2011	1.47%
Cognizant Technology Solutions Corp Class A (CTSH)	12/30/2011	1.32%
Textron (TXT)	12/30/2011	1.32%
Kinder Morgan (KMI)	12/30/2011	1.26%
Williams Companies (WMB)	12/30/2011	1.26%
Corpay (CPAY)	12/30/2011	1.25%
APA (APA)	12/30/2011	1.22%
Best Buy (BBY)	12/30/2011	1.17%
Ulta Beauty (ULTA)	12/30/2011	1.15%
Ford Motor (F)	12/30/2011	1.13%
Advanced Micro Devices (AMD)	12/30/2011	1.12%