Celsius (CELH) had the highest return in March 2009 by a US stock with a market cap of $10B+, returning 180%.

ASSET	MONTH	% RETURN
Celsius (CELH)	March 2009	180.02%
Modine Manufacturing (MOD)	March 2009	127.27%
Pilgrims Pride (PPC)	March 2009	104.54%
American International (AIG)	March 2009	92.31%
Bank of America (BAC)	March 2009	89.43%
Nova (NVMI)	March 2009	89.19%
Orix Corp Ads (IX)	March 2009	74.96%
Teck Resources Ltd Class B (TECK)	March 2009	70.25%
Citigroup (C)	March 2009	68.67%
Barclays PLC ADR (BCS)	March 2009	68.65%
Penske Automotive (PAG)	March 2009	67.21%
Madrigal Pharmaceuticals (MDGL)	March 2009	64.62%
Dillard's (DDS)	March 2009	64.3%
Amkor Technology (AMKR)	March 2009	63.03%
Deutsche Bank (DB)	March 2009	60.67%
Ferguson (FERG)	March 2009	60.01%
Blackstone (BX)	March 2009	59.34%
Lululemon Athletica (LULU)	March 2009	54.09%
ASE Industrial Holding Co Ltd ADR (ASX)	March 2009	51.21%
Seagate Technology (STX)	March 2009	46.59%
United Microelectronics (UMC)	March 2009	46.24%
Ciena (CIEN)	March 2009	45.97%
Fifth Third Bancorp (FITB)	March 2009	45.88%
Entegris (ENTG)	March 2009	45.76%
Western Digital (WDC)	March 2009	45.63%