MGM Resorts International (MGM) had the lowest return in March 2009 by a US stock in the S&P 500 (GSPC), returning -30.4%.

ASSET	MONTH	% RETURN
MGM Resorts International (MGM)	March 2009	-30.45%
Insulet (PODD)	March 2009	-30.15%
Live Nation Entertainment (LYV)	March 2009	-21.93%
L3Harris Technologies (LHX)	March 2009	-16.8%
Teleflex (TFX)	March 2009	-15.85%
McKesson (MCK)	March 2009	-13.37%
Caesars Entertainment (CZR)	March 2009	-11.76%
Republic Services (RSG)	March 2009	-11.36%
American Electric Power (AEP)	March 2009	-8.58%
FirstEnergy (FE)	March 2009	-7.94%
Constellation Brands Inc Class A (STZ)	March 2009	-6.52%
Paramount Global Class B (PARA)	March 2009	-6.3%
Transdigm (TDG)	March 2009	-5.79%
AES (AES)	March 2009	-5.38%
Booking (BKNG)	March 2009	-5.02%
Valero Energy (VLO)	March 2009	-4.99%
United Airlines (UAL)	March 2009	-4.88%
NRG Energy (NRG)	March 2009	-4.84%
Kellanova (K)	March 2009	-4.44%
McCormick (MKC)	March 2009	-4.15%
Accenture (ACN)	March 2009	-3.88%
Nasdaq (NDAQ)	March 2009	-3.45%
General Mills (GIS)	March 2009	-3.43%
General Dynamics (GD)	March 2009	-3.14%
Molson Coors Brewing (TAP)	March 2009	-2.83%