American International (AIG) had the highest return in March 2009 by a large-cap US stock, returning 92.3%.

ASSET	MONTH	% RETURN
American International (AIG)	March 2009	92.31%
Bank of America (BAC)	March 2009	89.44%
Nova (NVMI)	March 2009	89.19%
Orix Corp Ads (IX)	March 2009	74.95%
Teck Resources Ltd Class B (TECK)	March 2009	70.24%
Citigroup (C)	March 2009	68.67%
Barclays PLC ADR (BCS)	March 2009	68.65%
Penske Automotive (PAG)	March 2009	67.2%
Madrigal Pharmaceuticals (MDGL)	March 2009	64.62%
Dillard's (DDS)	March 2009	64.31%
Deutsche Bank (DB)	March 2009	60.67%
Ferguson (FERG)	March 2009	60%
Blackstone (BX)	March 2009	59.34%
Lululemon Athletica (LULU)	March 2009	54.09%
ASE Industrial Holding Co Ltd ADR (ASX)	March 2009	51.2%
Seagate Technology (STX)	March 2009	46.59%
United Microelectronics (UMC)	March 2009	46.24%
Ciena (CIEN)	March 2009	45.97%
Entegris (ENTG)	March 2009	45.76%
Western Digital (WDC)	March 2009	45.63%
CNH Industrial (CNH)	March 2009	44.77%
CBRE Group Inc Class A (CBRE)	March 2009	43.93%
Advanced Micro Devices (AMD)	March 2009	43.19%
Flex (FLEX)	March 2009	43.06%
Raymond James Financial (RJF)	March 2009	42.01%

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