Westlake Chemical (WLK) had the highest return between February 1, 2011 and March 31, 2011 by a large-cap US stock, returning 44.1%.

ASSET	DATE	% RETURN
Westlake Chemical (WLK)	2/1/2011 - 3/31/2011	44.14%
Wheaton Precious Metals (WPM)	2/1/2011 - 3/31/2011	37.85%
Leonardo DRS, Inc Common Stock (DRS)	2/1/2011 - 3/31/2011	37.7%
MasTec (MTZ)	2/1/2011 - 3/31/2011	35.68%
Generac (GNRC)	2/1/2011 - 3/31/2011	35.09%
Regeneron Pharmaceuticals (REGN)	2/1/2011 - 3/31/2011	33.39%
Franco-Nevada (FNV)	2/1/2011 - 3/31/2011	30.72%
Exelixis (EXEL)	2/1/2011 - 3/31/2011	30.68%
Ulta Beauty (ULTA)	2/1/2011 - 3/31/2011	29.73%
Lululemon Athletica (LULU)	2/1/2011 - 3/31/2011	27.98%
Builders FirstSource (BLDR)	2/1/2011 - 3/31/2011	26.79%
MicroStrategy (MSTR)	2/1/2011 - 3/31/2011	26.63%
Service Corporation International (SCI)	2/1/2011 - 3/31/2011	26.55%
Cboe Global Markets (CBOE)	2/1/2011 - 3/31/2011	26.48%
Contura Energy (CTRA)	2/1/2011 - 3/31/2011	26.45%
Electronic Arts (EA)	2/1/2011 - 3/31/2011	25.35%
Cheniere Energy (LNG)	2/1/2011 - 3/31/2011	24.47%
Westinghouse Air Brake Technologies (WAB)	2/1/2011 - 3/31/2011	24.41%
Smurfit WestRock (SW)	2/1/2011 - 3/31/2011	24.4%
Williams-Sonoma (WSM)	2/1/2011 - 3/31/2011	24.35%
T-Mobile US (TMUS)	2/1/2011 - 3/31/2011	24.16%
Nordson (NDSN)	2/1/2011 - 3/31/2011	23.93%
Chipotle Mexican Grill (CMG)	2/1/2011 - 3/31/2011	23.84%
Fair Isaac (FICO)	2/1/2011 - 3/31/2011	23.28%
AeroVironment (AVAV)	2/1/2011 - 3/31/2011	22.92%

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