American International (AIG) had the lowest return between 2003 and 2013 by a US stock in the S&P 500 (GSPC), returning -94.4%.

ASSET	YEARS	% RETURN
American International (AIG)	2003-2013	-94.36%
Citigroup (C)	2003-2013	-81.39%
Builders FirstSource (BLDR)	2003-2013	-52.89%
Fifth Third Bancorp (FITB)	2003-2013	-51.53%
Regions Financial (RF)	2003-2013	-45.16%
Boston Scientific (BSX)	2003-2013	-43.73%
Advanced Micro Devices (AMD)	2003-2013	-41.01%
Bank of America (BAC)	2003-2013	-39.27%
Caesars Entertainment (CZR)	2003-2013	-35.74%
Qorvo (QRVO)	2003-2013	-31.66%
Huntington Bancshares (HBAN)	2003-2013	-26.5%
KeyCorp (KEY)	2003-2013	-26.19%
T-Mobile US (TMUS)	2003-2013	-19.17%
Enphase Energy (ENPH)	2003-2013	-15.47%
Allegion (ALLE)	2003-2013	-11.18%
Electronic Arts (EA)	2003-2013	-8.2%
Newmont Goldcorp (NEM)	2003-2013	-8.12%
United Airlines (UAL)	2003-2013	-7%
Hartford Financial Services (HIG)	2003-2013	0.92%
Palo Alto Networks (PANW)	2003-2013	4.21%
Zoetis (ZTS)	2003-2013	4.42%
Hilton Worldwide (HLT)	2003-2013	4.46%
IQVIA (IQV)	2003-2013	5.9%
Masco (MAS)	2003-2013	6.85%
Take-Two Interactive Software (TTWO)	2003-2013	9.48%