Cheniere Energy (LNG) had the highest return in March 2013 by a large-cap US stock, returning 33.2%.

ASSET	MONTH	% RETURN
Cheniere Energy (LNG)	March 2013	33.21%
Best Buy (BBY)	March 2013	28.43%
Sarepta Therapeutics (SRPT)	March 2013	27.94%
Zillow (ZG)	March 2013	27.5%
Texas Pacific Land Trust (TPL)	March 2013	27.46%
American Airlines (AAL)	March 2013	26.93%
Deckers Outdoor (DECK)	March 2013	25.91%
Tenet Healthcare (THC)	March 2013	22.69%
Insmed (INSM)	March 2013	22.59%
Genmab A-S (GMAB)	March 2013	22.21%
Sony (SONY)	March 2013	21.7%
Tempur Sealy International (TPX)	March 2013	21.64%
Charter Communications (CHTR)	March 2013	21.46%
United Airlines (UAL)	March 2013	20.43%
Micron Technology (MU)	March 2013	19.89%
SS&C Technologies (SSNC)	March 2013	19.87%
HP (HPQ)	March 2013	19.65%
Diamondback Energy (FANG)	March 2013	19.29%
Vertex Pharmaceuticals (VRTX)	March 2013	18.09%
Live Nation Entertainment (LYV)	March 2013	17.7%
Discover Financial Services (DFS)	March 2013	17.01%
Jacobs Solutions (J)	March 2013	16.58%
Biogen (BIIB)	March 2013	16.53%
Suzano Papel e Celulose SA ADR (SUZ)	March 2013	16.42%
U-Haul (UHAL)	March 2013	16.27%

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