United Rentals (URI) had the highest return in April 2010 by a US stock in the S&P 500 (GSPC), returning 51%.

ASSET	MONTH	% RETURN
United Rentals (URI)	April 2010	51%
Netflix (NFLX)	April 2010	34.34%
MGM Resorts International (MGM)	April 2010	30.78%
Huntington Bancshares (HBAN)	April 2010	23.13%
Akamai Technologies (AKAM)	April 2010	22.76%
Builders FirstSource (BLDR)	April 2010	20.75%
Vulcan Materials (VMC)	April 2010	20.69%
EOG Resources (EOG)	April 2010	19.41%
Chipotle Mexican Grill (CMG)	April 2010	19.1%
Autodesk (ADSK)	April 2010	18.06%
First Solar (FSLR)	April 2010	17.7%
Las Vegas Sands (LVS)	April 2010	17.37%
O’Reilly Automotive (ORLY)	April 2010	16.89%
TE Connectivity (TEL)	April 2010	16.59%
Marriott International (MAR)	April 2010	16.07%
Mohawk Industries (MHK)	April 2010	15.98%
Wynn Resorts (WYNN)	April 2010	15.79%
Cummins (CMI)	April 2010	15.62%
KeyCorp (KEY)	April 2010	15.49%
DR Horton (DHI)	April 2010	15.49%
Tractor Supply (TSCO)	April 2010	15.31%
Molina Healthcare (MOH)	April 2010	15.3%
Sherwin-Williams (SHW)	April 2010	15.13%
PulteGroup (PHM)	April 2010	15.13%
Lennar (LEN)	April 2010	15.01%