American International (AIG) had the lowest return in July 2009 by a US stock in the S&P 500 (GSPC), returning -33.1%.

ASSET	MONTH	% RETURN
American International (AIG)	July 2009	-33.13%
Intercontinental Exchange (ICE)	July 2009	-17.97%
Akamai Technologies (AKAM)	July 2009	-14.64%
Insulet (PODD)	July 2009	-13.44%
T-Mobile US (TMUS)	July 2009	-11.3%
CME (CME)	July 2009	-10.9%
Moodys (MCO)	July 2009	-9.66%
JB Hunt Transport Services (JBHT)	July 2009	-9.07%
Becton Dickinson and (BDX)	July 2009	-8.88%
CoStar (CSGP)	July 2009	-8.72%
Lockheed Martin (LMT)	July 2009	-7.66%
Ametek (AME)	July 2009	-7.33%
Tyson Foods (TSN)	July 2009	-7.07%
Advanced Micro Devices (AMD)	July 2009	-6.87%
Molina Healthcare (MOH)	July 2009	-6.35%
PNC Financial Services (PNC)	July 2009	-5.81%
First Solar (FSLR)	July 2009	-5.75%
Bank of New York Mellon (BK)	July 2009	-5.74%
Deckers Outdoor (DECK)	July 2009	-5.04%
Centene (CNC)	July 2009	-4.64%
Genesis Healthcare (GEN)	July 2009	-4.6%
Willis Towers Watson (WTW)	July 2009	-4.56%
McDonald’s (MCD)	July 2009	-4.49%
Edwards Lifesciences (EW)	July 2009	-4.04%
BorgWarner (BWA)	July 2009	-3.96%