American International (AIG) had the lowest return between 2007 and 2009 by a US stock in the S&P 500 (GSPC), returning -97.8%.

ASSET	YEARS	% RETURN
American International (AIG)	2007-2009	-97.85%
Citigroup (C)	2007-2009	-93.42%
Caesars Entertainment (CZR)	2007-2009	-89.37%
MGM Resorts International (MGM)	2007-2009	-84.11%
Regions Financial (RF)	2007-2009	-83.79%
Las Vegas Sands (LVS)	2007-2009	-83.67%
KeyCorp (KEY)	2007-2009	-83.53%
Huntington Bancshares (HBAN)	2007-2009	-82.32%
Builders FirstSource (BLDR)	2007-2009	-76.7%
Fifth Third Bancorp (FITB)	2007-2009	-73.69%
Lennar (LEN)	2007-2009	-73.45%
Hartford Financial Services (HIG)	2007-2009	-72.24%
T-Mobile US (TMUS)	2007-2009	-69.6%
United Airlines (UAL)	2007-2009	-69.18%
PulteGroup (PHM)	2007-2009	-69.15%
Bank of America (BAC)	2007-2009	-67.81%
Valero Energy (VLO)	2007-2009	-67.08%
Cadence Design Systems (CDNS)	2007-2009	-66.7%
Electronic Arts (EA)	2007-2009	-65.03%
KKR (KKR)	2007-2009	-62.98%
Live Nation Entertainment (LYV)	2007-2009	-62.35%
United Rentals (URI)	2007-2009	-61.68%
Motorola Solutions (MSI)	2007-2009	-60.98%
Moodys (MCO)	2007-2009	-59.77%
CBRE Group Inc Class A (CBRE)	2007-2009	-59.37%