American International (AIG) had the lowest return between 2003 and 2014 by a US stock in the S&P 500 (GSPC), returning -93.8%.

ASSET	YEARS	% RETURN
American International (AIG)	2003-2014	-93.76%
Citigroup (C)	2003-2014	-80.66%
Advanced Micro Devices (AMD)	2003-2014	-59.3%
Builders FirstSource (BLDR)	2003-2014	-54.61%
Fifth Third Bancorp (FITB)	2003-2014	-51.9%
Caesars Entertainment (CZR)	2003-2014	-49.56%
Regions Financial (RF)	2003-2014	-40.42%
Boston Scientific (BSX)	2003-2014	-37.97%
T-Mobile US (TMUS)	2003-2014	-35.27%
Bank of America (BAC)	2003-2014	-29.72%
Newmont Goldcorp (NEM)	2003-2014	-24.13%
KeyCorp (KEY)	2003-2014	-22.11%
Huntington Bancshares (HBAN)	2003-2014	-18.13%
Alphabet Inc Class C (GOOG)	2003-2014	-7.63%
News Corp (NWS)	2003-2014	-0.85%
News Corp (NWSA)	2003-2014	2.68%
General Motors (GM)	2003-2014	3.27%
Leidos (LDOS)	2003-2014	8.95%
Arista Networks (ANET)	2003-2014	9.97%
Allegion (ALLE)	2003-2014	12.14%
Citizens Financial (CFG)	2003-2014	16.11%
Hartford Financial Services (HIG)	2003-2014	18.2%
Masco (MAS)	2003-2014	18.25%
Avery Dennison (AVY)	2003-2014	20.64%
Amun Bitwise Select 10 Large Cap Crypto ETP (KEYS)	2003-2014	21.04%