T-Mobile US (TMUS) had the lowest return in August 2007 by a US stock in the S&P 500 (GSPC), returning -26.1%.

ASSET	MONTH	% RETURN
T-Mobile US (TMUS)	August 2007	-26.08%
Caesars Entertainment (CZR)	August 2007	-21.18%
F5 Networks (FFIV)	August 2007	-19.23%
S&P Global (SPGI)	August 2007	-16.75%
CBRE Group Inc Class A (CBRE)	August 2007	-15.66%
Ralph Lauren Corp Class A (RL)	August 2007	-15.09%
Moodys (MCO)	August 2007	-14.95%
PulteGroup (PHM)	August 2007	-13.78%
CSX (CSX)	August 2007	-13.2%
West Pharmaceutical Services (WST)	August 2007	-12.99%
Align Technology (ALGN)	August 2007	-12.44%
Builders FirstSource (BLDR)	August 2007	-10.58%
Huntington Bancshares (HBAN)	August 2007	-9.66%
State Street (STT)	August 2007	-9.51%
Mastercard (MA)	August 2007	-9.17%
Take-Two Interactive Software (TTWO)	August 2007	-8.95%
Domino's Pizza Inc Common Stock (DPZ)	August 2007	-8.86%
FactSet Research Systems (FDS)	August 2007	-8.73%
Deckers Outdoor (DECK)	August 2007	-8.62%
Cognizant Technology Solutions Corp Class A (CTSH)	August 2007	-8.43%
Lam Research (LRCX)	August 2007	-8.37%
Capital One Financial (COF)	August 2007	-8.25%
Westinghouse Air Brake Technologies (WAB)	August 2007	-8.23%
Ford Motor (F)	August 2007	-7.9%
Church & Dwight (CHD)	August 2007	-7.76%